AgentIndex x402

Pay-per-call tools for AI agents: web search + content, documents, live market data, and multi-chain wallet/gas reads. Mainnet test from $0.000001 USDC on Base. Start with GET /wallet-intelligence ($0.001): one signature replaces wallet and gas reads on five EVM networks. Cheapest single reads cost $0.001. USDC on Base (x402), no account, no API key. Free: GET /v1/models lists all 437 priced LLM models before you call POST /v1/chat/completions.

Skills

• agent-verification-listing
  Buy a 30-day verified agent listing for $0.01 USDC. AgentIndex audits reachability, x402 compatibility and discovery manifests, then publishes a machine-readable registry entry and score badge for buyer trust and SEO.
• agent-verification-listing
  Buy a 30-day verified agent listing for $0.01 USDC. AgentIndex audits reachability, x402 compatibility and discovery manifests, then publishes a machine-readable registry entry and score badge for buyer trust and SEO.
• api-health-check
  Fresh operational audit of any public agent or paid API: reachability, latency, HTTP status, x402 challenge, price/network/payTo, OpenAPI, agent card and MCP manifest. Returns a 0-100 score, verdict and issues. Try GET /agent-health/sample.
• api-health-check
  Fresh operational audit of any public agent or paid API: reachability, latency, HTTP status, x402 challenge, price/network/payTo, OpenAPI, agent card and MCP manifest. Returns a 0-100 score, verdict and issues. Try GET /agent-health/sample.
• base-allowance
  ERC20 allowance on Base mainnet via RPC: how much a spender is approved to move from an owner balance, read with allowance(owner,spender) eth_call.
• base-allowance
  ERC20 allowance on Base mainnet via RPC: how much a spender is approved to move from an owner balance, read with allowance(owner,spender) eth_call.
• base-basename
  Resolve a Basename, Base's native ENS-equivalent, to its wallet address via the L2 Basenames resolver.
• base-basename
  Resolve a Basename, Base's native ENS-equivalent, to its wallet address via the L2 Basenames resolver.
• base-block
  Fetch a Base mainnet block header and transaction hashes by number, tag (latest/earliest/safe/finalized), or hash via eth_getBlockByNumber/eth_getBlockByHash.
• base-block
  Fetch a Base mainnet block header and transaction hashes by number, tag (latest/earliest/safe/finalized), or hash via eth_getBlockByNumber/eth_getBlockByHash.
• base-block-number
  Latest Base mainnet block height via eth_blockNumber - the current chain tip.
• base-block-number
  Latest Base mainnet block height via eth_blockNumber - the current chain tip.
• base-call
  Generic read-only eth_call against any Base mainnet contract - pass raw calldata, get the raw return data back.
• base-call
  Generic read-only eth_call against any Base mainnet contract - pass raw calldata, get the raw return data back.
• base-can-sell
  Can I sell this token? Honeypot check that simulates a real buy then a real sell of a Base mainnet token in one atomic on-chain call via Uniswap V2 - if the sell reverts, that is a honeypot, reported with the exact decoded reason. Factual, never predictive.
• base-can-sell
  Can I sell this token? Honeypot check that simulates a real buy then a real sell of a Base mainnet token in one atomic on-chain call via Uniswap V2 - if the sell reverts, that is a honeypot, reported with the exact decoded reason. Factual, never predictive.
• base-chain-id
  Base mainnet chain ID (EIP-155) via eth_chainId - confirm which network you're actually talking to.
• base-chain-id
  Base mainnet chain ID (EIP-155) via eth_chainId - confirm which network you're actually talking to.
• base-code
  Check whether a Base mainnet address is a contract via eth_getCode - returns bytecode size, zero for an externally-owned account.
• base-code
  Check whether a Base mainnet address is a contract via eth_getCode - returns bytecode size, zero for an externally-owned account.
• base-contract
  Contract introspection on Base mainnet - is it a contract, bytecode size, best-effort owner(), and whether it's a proxy.
• base-contract
  Contract introspection on Base mainnet - is it a contract, bytecode size, best-effort owner(), and whether it's a proxy.
• base-erc1155-balance
  ERC1155 multi-token balance for a wallet and token id on Base mainnet via balanceOf(address,uint256).
• base-erc1155-balance
  ERC1155 multi-token balance for a wallet and token id on Base mainnet via balanceOf(address,uint256).
• base-erc20-balance
  ERC20 token balance for a wallet on Base mainnet - balanceOf() and decimals() batched into one Multicall3 round trip.
• base-erc20-balance
  ERC20 token balance for a wallet on Base mainnet - balanceOf() and decimals() batched into one Multicall3 round trip.
• base-erc20-transfers
  ERC20 Transfer event logs for one token over a Base mainnet block range (max 2,000 blocks) via eth_getLogs.
• base-erc20-transfers
  ERC20 Transfer event logs for one token over a Base mainnet block range (max 2,000 blocks) via eth_getLogs.
• base-nft-holdings
  NFT holdings for a wallet in one Base ERC721 collection, owned token IDs via ERC721Enumerable (tokenOfOwnerByIndex) - up to 20 tokens, requires the collection to implement Enumerable.
• base-nft-holdings
  NFT holdings for a wallet in one Base ERC721 collection, owned token IDs via ERC721Enumerable (tokenOfOwnerByIndex) - up to 20 tokens, requires the collection to implement Enumerable.
• base-estimate-gas
  Gas estimate for a Base mainnet swap or any other call (to/from/value/data) via eth_estimateGas, without broadcasting a transaction.
• base-estimate-gas
  Gas estimate for a Base mainnet swap or any other call (to/from/value/data) via eth_estimateGas, without broadcasting a transaction.
• base-events
  Smart contract event logs on Base mainnet (Base contract events) via eth_getLogs - filter by contract address and up to 4 topics, up to 2,000 blocks, raw logs with topics, data, block and tx hash.
• base-events
  Smart contract event logs on Base mainnet (Base contract events) via eth_getLogs - filter by contract address and up to 4 topics, up to 2,000 blocks, raw logs with topics, data, block and tx hash.
• base-live-balance
  Native ETH balance plus up to 20 ERC20 token balances for one wallet on Base mainnet, in a single Multicall3 round trip regardless of token count.
• base-live-balance
  Native ETH balance plus up to 20 ERC20 token balances for one wallet on Base mainnet, in a single Multicall3 round trip regardless of token count.
• base-network-info
  Base mainnet network info in one call: chain ID, block height, and current gas price (wei and gwei).
• base-network-info
  Base mainnet network info in one call: chain ID, block height, and current gas price (wei and gwei).
• base-nft-metadata
  NFT metadata URI for an ERC721 token on Base mainnet via tokenURI - the on-chain pointer (IPFS, HTTP, or data URI), not a fetch of the document itself.
• base-nft-metadata
  NFT metadata URI for an ERC721 token on Base mainnet via tokenURI - the on-chain pointer (IPFS, HTTP, or data URI), not a fetch of the document itself.
• base-nft-owner
  Who owns this NFT? ERC721 owner lookup on Base mainnet via ownerOf(tokenId).
• base-nft-owner
  Who owns this NFT? ERC721 owner lookup on Base mainnet via ownerOf(tokenId).
• base-nonce
  Next transaction nonce for any Base mainnet wallet via eth_getTransactionCount - how many transactions it has sent.
• base-nonce
  Next transaction nonce for any Base mainnet wallet via eth_getTransactionCount - how many transactions it has sent.
• base-pending-block
  The current pending Base mainnet block (mempool, not yet mined) - unconfirmed transactions via eth_getBlockByNumber('pending').
• base-pending-block
  The current pending Base mainnet block (mempool, not yet mined) - unconfirmed transactions via eth_getBlockByNumber('pending').
• base-proxy
  Is this Base contract an upgradeable proxy? Proxy contract detection for EIP-1967 (transparent/UUPS), beacon, or EIP-1822 patterns, returning the implementation address.
• base-proxy
  Is this Base contract an upgradeable proxy? Proxy contract detection for EIP-1967 (transparent/UUPS), beacon, or EIP-1822 patterns, returning the implementation address.
• base-quote
  Slippage estimate, swap quote, and best DEX price on Base - compares Uniswap v2, Uniswap v3, and Aerodrome on-chain via Multicall3, returns amount received, chosen path, and price impact.
• base-quote
  Slippage estimate, swap quote, and best DEX price on Base - compares Uniswap v2, Uniswap v3, and Aerodrome on-chain via Multicall3, returns amount received, chosen path, and price impact.
• base-receipt
  Transaction receipt via eth_getTransactionReceipt - status, gas used, and event logs for a mined Base mainnet transaction.
• base-receipt
  Transaction receipt via eth_getTransactionReceipt - status, gas used, and event logs for a mined Base mainnet transaction.
• base-simulate
  Simulate a Base mainnet transaction before sending it - will it succeed, estimated gas, and the decoded revert reason if it would fail.
• base-simulate
  Simulate a Base mainnet transaction before sending it - will it succeed, estimated gas, and the decoded revert reason if it would fail.
• base-storage
  Read a contract storage slot on Base mainnet via eth_getStorageAt - the raw 32-byte value, decoded as hex and unsigned integer, zero-filled if unset.
• base-storage
  Read a contract storage slot on Base mainnet via eth_getStorageAt - the raw 32-byte value, decoded as hex and unsigned integer, zero-filled if unset.
• base-total-supply
  Total supply for an ERC20 (normalized by decimals()) or ERC721 (raw count, no decimals) contract on Base mainnet.
• base-total-supply
  Total supply for an ERC20 (normalized by decimals()) or ERC721 (raw count, no decimals) contract on Base mainnet.
• base-tx
  Base transaction lookup by hash - sender, recipient, value, calldata, gas and block, live from Base mainnet via eth_getTransactionByHash.
• base-tx
  Base transaction lookup by hash - sender, recipient, value, calldata, gas and block, live from Base mainnet via eth_getTransactionByHash.
• wallet-can-pay
  Check whether a Base wallet holds enough USDC to pay an x402 amount (default $0.001). Returns balance, can_pay, shortfall. The checklist agents run before spending. Try GET /can-pay/sample.
• wallet-can-pay
  Check whether a Base wallet holds enough USDC to pay an x402 amount (default $0.001). Returns balance, can_pay, shortfall. The checklist agents run before spending. Try GET /can-pay/sample.
• support-ticket-classifier
  Text classification with your own custom labels (2-20) - categorize a support ticket, a review, or any text into the best-fitting label, with a confidence score and an alternate label. Powered by Jev, falling back to a Groq-hosted LLM if Jev is slow or unavailable - under 4.5s guaranteed. Try GET /classify/sample.
• support-ticket-classifier
  Text classification with your own custom labels (2-20) - categorize a support ticket, a review, or any text into the best-fitting label, with a confidence score and an alternate label. Powered by Jev, falling back to a Groq-hosted LLM if Jev is slow or unavailable - under 4.5s guaranteed. Try GET /classify/sample.
• crypto-price
  Live spot prices for crypto coins (BTC, ETH, SOL, ...) in USD or another fiat, with 24h change. Accepts tickers or CoinGecko ids. Try GET /crypto/sample.
• crypto-price
  Live spot prices for crypto coins (BTC, ETH, SOL, ...) in USD or another fiat, with 24h change. Accepts tickers or CoinGecko ids. Try GET /crypto/sample.
• decision-questions
  Ask up to 20 typed yes/no, multiple-choice or ordinal-scale questions about one shared piece of context in a single call - each answered with a real probability (Jev decision primitives), not generated text. Powered by Jev (TypeSafe System One). $0.001 per call, no OpenRouter or TypeSafe account needed. Try GET /decide/sample.
• decision-questions
  Ask up to 20 typed yes/no, multiple-choice or ordinal-scale questions about one shared piece of context in a single call - each answered with a real probability (Jev decision primitives), not generated text. Powered by Jev (TypeSafe System One). $0.001 per call, no OpenRouter or TypeSafe account needed. Try GET /decide/sample.
• mcp-discovery
  Find MCP servers matching a need, ranked by semantic similarity over a curated snapshot of MCP servers. Returns name, endpoint, description, source registry and a 0-1 relevance per match. Paid POST: up to 25 matches. Try GET /discover/sample.
• mcp-discovery
  Find MCP servers matching a need, ranked by semantic similarity over a curated snapshot of MCP servers. Returns name, endpoint, description, source registry and a 0-1 relevance per match. Paid POST: up to 25 matches. Try GET /discover/sample.
• encoding-detect
  Detect whether hex-encoded bytes are ASCII, UTF-8, or UTF-16 with a BOM, by decode-validity and BOM presence (not statistical language detection).
• encoding-detect
  Detect whether hex-encoded bytes are ASCII, UTF-8, or UTF-16 with a BOM, by decode-validity and BOM presence (not statistical language detection).
• encoding-transcode
  Convert text between utf-8, base64, hex, URL-percent-encoding and ascii representations.
• encoding-transcode
  Convert text between utf-8, base64, hex, URL-percent-encoding and ascii representations.
• extract-structured-data
  Extract structured data from a URL or raw text into strict JSON matching a schema you provide. Fields the content doesn't support come back null - never an invented or approximate value, and an unmatchable schema returns an explicit error. Try GET /extract/sample. Part of the AgentIndex content kit (pdf, web-read, extract, summarize, detect-language) - see GET /capabilities.
• extract-structured-data
  Extract structured data from a URL or raw text into strict JSON matching a schema you provide. Fields the content doesn't support come back null - never an invented or approximate value, and an unmatchable schema returns an explicit error. Try GET /extract/sample. Part of the AgentIndex content kit (pdf, web-read, extract, summarize, detect-language) - see GET /capabilities.
• fact-check
  Check a claim against live web sources - a verdict, a confidence level, and the sources that support or contradict it, each with its URL and stance. Returns 'inconclusive' rather than a guess when the sources don't clearly settle it. Try GET /fact-check/sample. Part of the AgentIndex content kit (pdf, web-read, extract, summarize, detect-language) - see GET /capabilities.
• fact-check
  Check a claim against live web sources - a verdict, a confidence level, and the sources that support or contradict it, each with its URL and stance. Returns 'inconclusive' rather than a guess when the sources don't clearly settle it. Try GET /fact-check/sample. Part of the AgentIndex content kit (pdf, web-read, extract, summarize, detect-language) - see GET /capabilities.
• fraction-simplify
  Simplify a fraction to lowest terms and return its decimal value.
• fraction-simplify
  Simplify a fraction to lowest terms and return its decimal value.
• gas-price-checker
  Read the live gas price, EIP-1559 base fee and estimated native-transfer cost on Base, Ethereum, Polygon, Arbitrum or Optimism. No RPC key or account. Try GET /gas-price/sample.
• gas-price-checker
  Read the live gas price, EIP-1559 base fee and estimated native-transfer cost on Base, Ethereum, Polygon, Arbitrum or Optimism. No RPC key or account. Try GET /gas-price/sample.
• geo-bbox
  Bounding box (min/max lat and lon) enclosing a list of points.
• geo-bbox
  Bounding box (min/max lat and lon) enclosing a list of points.
• geo-bearing
  Initial compass bearing (0-360 degrees, clockwise from true north) from point 1 to point 2.
• geo-bearing
  Initial compass bearing (0-360 degrees, clockwise from true north) from point 1 to point 2.
• geo-distance
  Great-circle distance between two lat/lon points (haversine formula). Returns km, mi or nm.
• geo-distance
  Great-circle distance between two lat/lon points (haversine formula). Returns km, mi or nm.
• geo-dms
  Convert decimal degrees to degrees/minutes/seconds, or DMS back to decimal degrees.
• geo-dms
  Convert decimal degrees to degrees/minutes/seconds, or DMS back to decimal degrees.
• geo-geohash
  Encode a lat/lon point into a geohash string (precision 1-12 characters).
• geo-geohash
  Encode a lat/lon point into a geohash string (precision 1-12 characters).
• geo-midpoint
  Geographic (great-circle) midpoint between two lat/lon points.
• geo-midpoint
  Geographic (great-circle) midpoint between two lat/lon points.
• geo-point-in-polygon
  Ray-casting point-in-polygon test (planar approximation - fine for city/region-scale polygons).
• geo-point-in-polygon
  Ray-casting point-in-polygon test (planar approximation - fine for city/region-scale polygons).
• tool-call-guard
  Ask whether a tool call should run automatically, need human confirmation, or be denied, given the user's request - returns allow/ask/deny with a probability. Advisory only: like any LLM-based judge it is sensitive to prompt injection in the request or tool call, so the calling agent must keep the final decision, not delegate it outright. Powered by Jev (TypeSafe System One). $0.001 per call, no OpenRouter or TypeSafe account needed. Try GET /guard/sample.
• tool-call-guard
  Ask whether a tool call should run automatically, need human confirmation, or be denied, given the user's request - returns allow/ask/deny with a probability. Advisory only: like any LLM-based judge it is sensitive to prompt injection in the request or tool call, so the calling agent must keep the final decision, not delegate it outright. Powered by Jev (TypeSafe System One). $0.001 per call, no OpenRouter or TypeSafe account needed. Try GET /guard/sample.
• hash-hash
  Compute an MD5, SHA-1, SHA-256 or SHA-512 hex digest of text.
• hash-hash
  Compute an MD5, SHA-1, SHA-256 or SHA-512 hex digest of text.
• hash-hmac
  Compute an HMAC (MD5, SHA-1, SHA-256 or SHA-512) of text with a given key.
• hash-hmac
  Compute an HMAC (MD5, SHA-1, SHA-256 or SHA-512) of text with a given key.
• intent-detection
  Intent detection: classify text as a question, request, complaint, compliment, or other, with a confidence score and an alternate label. Powered by Jev, with an automatic Groq-hosted LLM fallback if Jev is slow or unavailable - under 4.5s guaranteed. Try GET /intent/sample.
• intent-detection
  Intent detection: classify text as a question, request, complaint, compliment, or other, with a confidence score and an alternate label. Powered by Jev, with an automatic Groq-hosted LLM fallback if Jev is slow or unavailable - under 4.5s guaranteed. Try GET /intent/sample.
• web-research
  Multi-query web research, read and synthesized into one sourced JSON brief in a single call - what would otherwise cost an agent twenty calls and its whole context window. Free status polling and result retrieval. Try GET /jobs/sample.
• web-research
  Multi-query web research, read and synthesized into one sourced JSON brief in a single call - what would otherwise cost an agent twenty calls and its whole context window. Free status polling and result retrieval. Try GET /jobs/sample.
• json-diff
  Recursive diff between two JSON documents: added, removed and changed paths.
• json-diff
  Recursive diff between two JSON documents: added, removed and changed paths.
• json-flatten
  Flatten a nested JSON document into single-level dotted-path keys.
• json-flatten
  Flatten a nested JSON document into single-level dotted-path keys.
• json-query
  Query a JSON document with a JSONPath expression.
• json-query
  Query a JSON document with a JSONPath expression.
• json-schema-infer
  Infer a basic JSON Schema (types, object properties, array item type) from an example document.
• json-schema-infer
  Infer a basic JSON Schema (types, object properties, array item type) from an example document.
• json-validate
  Validate a JSON document against a JSON Schema.
• json-validate
  Validate a JSON document against a JSON Schema.
• language-detection
  Language detection: identify which of 20 common languages (or "other") a text is written in, with a confidence score. Powered by Jev, with an automatic Groq-hosted LLM fallback if Jev is slow or unavailable - under 4.5s guaranteed. Try GET /language/sample.
• language-detection
  Language detection: identify which of 20 common languages (or "other") a text is written in, with a confidence score. Powered by Jev, with an automatic Groq-hosted LLM fallback if Jev is slow or unavailable - under 4.5s guaranteed. Try GET /language/sample.
• claude-sonnet-api
  Claude Sonnet API - pay per call, no API key. OpenAI-format chat completions on anthropic/claude-sonnet-5.5, pinned to Anthropic's own OpenRouter endpoint for reliability. You sign a fixed price computed from your max_tokens; unused tokens are not refunded. 20s server-side timeout - never charged if it fires; set your client timeout to 30s. Try GET /llm/claude-sonnet/sample.
• claude-sonnet-api
  Claude Sonnet API - pay per call, no API key. OpenAI-format chat completions on anthropic/claude-sonnet-5.5, pinned to Anthropic's own OpenRouter endpoint for reliability. You sign a fixed price computed from your max_tokens; unused tokens are not refunded. 20s server-side timeout - never charged if it fires; set your client timeout to 30s. Try GET /llm/claude-sonnet/sample.
• gpt-mini-api
  GPT Mini API - pay per call, no API key. OpenAI-format chat completions on openai/gpt-5.4-mini, pinned to OpenAI's own OpenRouter endpoint for reliability. You sign a fixed price computed from your max_tokens; unused tokens are not refunded. 20s server-side timeout with an automatic 2nd-provider retry if the first is slow - never charged if both miss; set your client timeout to 30s. Try GET /llm/gpt-mini/sample.
• gpt-mini-api
  GPT Mini API - pay per call, no API key. OpenAI-format chat completions on openai/gpt-5.4-mini, pinned to OpenAI's own OpenRouter endpoint for reliability. You sign a fixed price computed from your max_tokens; unused tokens are not refunded. 20s server-side timeout with an automatic 2nd-provider retry if the first is slow - never charged if both miss; set your client timeout to 30s. Try GET /llm/gpt-mini/sample.
• llama-api
  Llama API - pay per call, no API key. OpenAI-format chat completions on meta-llama/llama-4-maverick, pinned to DeepInfra for reliability. You sign a fixed price computed from your max_tokens; unused tokens are not refunded. 20s server-side timeout - never charged if it fires; set your client timeout to 30s. Try GET /llm/llama/sample.
• llama-api
  Llama API - pay per call, no API key. OpenAI-format chat completions on meta-llama/llama-4-maverick, pinned to DeepInfra for reliability. You sign a fixed price computed from your max_tokens; unused tokens are not refunded. 20s server-side timeout - never charged if it fires; set your client timeout to 30s. Try GET /llm/llama/sample.
• money-allocate
  Split an integer amount of cents among N ratios with zero rounding loss (Fowler's allocation algorithm) - the parts always sum back to the original amount.
• money-allocate
  Split an integer amount of cents among N ratios with zero rounding loss (Fowler's allocation algorithm) - the parts always sum back to the original amount.
• money-format
  Format a numeric amount with thousands separators, a chosen decimal precision and a currency symbol.
• money-format
  Format a numeric amount with thousands separators, a chosen decimal precision and a currency symbol.
• tech-news-headlines
  Top Hacker News headlines right now - title, URL, score, comments. Fresh links for agents that need current tech/startup signal. Try GET /news/sample.
• tech-news-headlines
  Top Hacker News headlines right now - title, URL, score, comments. Fresh links for agents that need current tech/startup signal. Try GET /news/sample.
• number-ordinal
  Convert an integer to its English ordinal form (1st, 2nd, 3rd, 4th, 11th, 21st...).
• number-ordinal
  Convert an integer to its English ordinal form (1st, 2nd, 3rd, 4th, 11th, 21st...).
• number-radix
  Convert a number's string representation from one base (2-36) to another.
• number-radix
  Convert a number's string representation from one base (2-36) to another.
• number-roman
  Convert an integer (1-3999) to a Roman numeral, or a Roman numeral back to an integer.
• number-roman
  Convert an integer (1-3999) to a Roman numeral, or a Roman numeral back to an integer.
• number-words
  Convert an integer into English words.
• number-words
  Convert an integer into English words.
• pdf-to-markdown
  Extract a public PDF (by HTTPS URL or base64) into clean Markdown - headings and tables preserved via layout-aware parsing, plus title/author/page count/date metadata and a real token count. Text content itself is never generated or altered, only its structure is inferred. Try GET /pdf/sample. Part of the AgentIndex content kit (pdf, web-read, extract, summarize, detect-language) - see GET /capabilities.
• pdf-to-markdown
  Extract a public PDF (by HTTPS URL or base64) into clean Markdown - headings and tables preserved via layout-aware parsing, plus title/author/page count/date metadata and a real token count. Text content itself is never generated or altered, only its structure is inferred. Try GET /pdf/sample. Part of the AgentIndex content kit (pdf, web-read, extract, summarize, detect-language) - see GET /capabilities.
• pii-detection
  PII detection: flag whether text contains personally identifiable information (name plus contact details, email, phone, address, government ID, financial account) with a confidence score. Powered by Jev, with an automatic Groq-hosted LLM fallback if Jev is slow or unavailable - under 4.5s guaranteed. Try GET /pii-check/sample.
• pii-detection
  PII detection: flag whether text contains personally identifiable information (name plus contact details, email, phone, address, government ID, financial account) with a confidence score. Powered by Jev, with an automatic Groq-hosted LLM fallback if Jev is slow or unavailable - under 4.5s guaranteed. Try GET /pii-check/sample.
• x402-paywall-probe
  Probe any public URL and report if it is an x402 paywall - price, network, payTo, scheme. Shop paywalls before you spend. Try GET /probe/sample.
• x402-paywall-probe
  Probe any public URL and report if it is an x402 paywall - price, network, payTo, scheme. Shop paywalls before you spend. Try GET /probe/sample.
• document-rerank
  Rank up to 50 documents by relevance to a query in a single call - each document returned with its relevance probability, sorted highest first. Powered by Jev (TypeSafe System One). $0.001 per call, no OpenRouter or TypeSafe account needed. Try GET /rank/sample.
• document-rerank
  Rank up to 50 documents by relevance to a query in a single call - each document returned with its relevance probability, sorted highest first. Powered by Jev (TypeSafe System One). $0.001 per call, no OpenRouter or TypeSafe account needed. Try GET /rank/sample.
• regex-replace
  Replace regular expression matches in text, with an optional max-replacement count.
• regex-replace
  Replace regular expression matches in text, with an optional max-replacement count.
• regex-test
  Test a regular expression against text; returns match status, capture groups and span.
• regex-test
  Test a regular expression against text; returns match status, capture groups and span.
• cited-research
  Jev-powered research: routed search, cited answer, claims verified against sources. Ask a question, get a 5-8 sentence answer, each claim tagged to a numbered source, built from real page content - no invented facts. A fast paid LLM writes it, under 4.5s guaranteed; on a rare miss, a no-LLM extractive fallback (top sentences from the sources, picked by Jev) takes over instead, marked "synthesis":"extractive". Try GET /research/sample.
• cited-research
  Jev-powered research: routed search, cited answer, claims verified against sources. Ask a question, get a 5-8 sentence answer, each claim tagged to a numbered source, built from real page content - no invented facts. A fast paid LLM writes it, under 4.5s guaranteed; on a rare miss, a no-LLM extractive fallback (top sentences from the sources, picked by Jev) takes over instead, marked "synthesis":"extractive". Try GET /research/sample.
• web-search
  Jev-routed web search: each query goes to the best specialised source (code, facts, news, prices), results ranked by relevance. 28/30 test queries answered. Up to 10 results per query, each with title, URL, snippet, short extract and publish date. Up to 5 queries per call, merged and de-duplicated. No account, no API key. Try GET /search/sample. Part of the AgentIndex content kit (pdf, web-read, extract, summarize, detect-language) - see GET /capabilities.
• web-search
  Jev-routed web search: each query goes to the best specialised source (code, facts, news, prices), results ranked by relevance. 28/30 test queries answered. Up to 10 results per query, each with title, URL, snippet, short extract and publish date. Up to 5 queries per call, merged and de-duplicated. No account, no API key. Try GET /search/sample. Part of the AgentIndex content kit (pdf, web-read, extract, summarize, detect-language) - see GET /capabilities.
• sentiment-analysis
  Sentiment analysis: classify text as positive, negative, or neutral with a confidence score and an alternate label. Powered by Jev, with an automatic Groq-hosted LLM fallback if Jev is slow or unavailable ("engine":"jev"|"fallback" in the response) - under 4.5s guaranteed. Try GET /sentiment/sample.
• sentiment-analysis
  Sentiment analysis: classify text as positive, negative, or neutral with a confidence score and an alternate label. Powered by Jev, with an automatic Groq-hosted LLM fallback if Jev is slow or unavailable ("engine":"jev"|"fallback" in the response) - under 4.5s guaranteed. Try GET /sentiment/sample.
• spam-detection
  Spam detection: classify text as spam or not spam with a confidence score. Powered by Jev, with an automatic Groq-hosted LLM fallback if Jev is slow or unavailable - under 4.5s guaranteed. Try GET /spam-check/sample.
• spam-detection
  Spam detection: classify text as spam or not spam with a confidence score. Powered by Jev, with an automatic Groq-hosted LLM fallback if Jev is slow or unavailable - under 4.5s guaranteed. Try GET /spam-check/sample.
• stats-correlation
  Pearson correlation coefficient between two equal-length numeric series.
• stats-correlation
  Pearson correlation coefficient between two equal-length numeric series.
• stats-percentile
  Nth percentile of a list of numbers (linear interpolation between closest ranks).
• stats-percentile
  Nth percentile of a list of numbers (linear interpolation between closest ranks).
• stats-regression
  Ordinary least squares simple linear regression (y = slope*x + intercept) with R-squared.
• stats-regression
  Ordinary least squares simple linear regression (y = slope*x + intercept) with R-squared.
• stats-summary
  Descriptive statistics for a list of numbers: count, mean, median, sample stdev/variance, min, max.
• stats-summary
  Descriptive statistics for a list of numbers: count, mean, median, sample stdev/variance, min, max.
• summarize-text
  Summarize a URL, raw text or HTML at the length you request - short, medium or long - with the source noted. Neutral and factual, no invented facts. Try GET /summarize/sample. Part of the AgentIndex content kit (pdf, web-read, extract, summarize, detect-language) - see GET /capabilities.
• summarize-text
  Summarize a URL, raw text or HTML at the length you request - short, medium or long - with the source noted. Neutral and factual, no invented facts. Try GET /summarize/sample. Part of the AgentIndex content kit (pdf, web-read, extract, summarize, detect-language) - see GET /capabilities.
• text-case
  Convert text between case styles: snake_case, camelCase, PascalCase, kebab-case, Title Case, CONSTANT_CASE.
• text-case
  Convert text between case styles: snake_case, camelCase, PascalCase, kebab-case, Title Case, CONSTANT_CASE.
• text-diff
  Unified line diff between two texts, plus an overall similarity ratio (0-1).
• text-diff
  Unified line diff between two texts, plus an overall similarity ratio (0-1).
• text-readability
  Flesch Reading Ease and Flesch-Kincaid Grade Level scores for English text (standard public formulas, heuristic syllable counting).
• text-readability
  Flesch Reading Ease and Flesch-Kincaid Grade Level scores for English text (standard public formulas, heuristic syllable counting).
• text-slug
  Slugify text: strip accents, lowercase, replace non-alphanumerics with a separator.
• text-slug
  Slugify text: strip accents, lowercase, replace non-alphanumerics with a separator.
• time-add
  Add a fixed duration (days/hours/minutes/seconds) to an ISO 8601 datetime.
• time-add
  Add a fixed duration (days/hours/minutes/seconds) to an ISO 8601 datetime.
• time-between
  Duration between two ISO 8601 datetimes, as total seconds and a days/hours/minutes/seconds breakdown.
• time-between
  Duration between two ISO 8601 datetimes, as total seconds and a days/hours/minutes/seconds breakdown.
• time-business-days
  Count weekdays (Mon-Fri) between two dates, inclusive of both endpoints.
• time-business-days
  Count weekdays (Mon-Fri) between two dates, inclusive of both endpoints.
• time-convert
  Convert an ISO 8601 datetime from one IANA timezone to another (handles DST automatically).
• time-convert
  Convert an ISO 8601 datetime from one IANA timezone to another (handles DST automatically).
• time-format
  Format an ISO 8601 datetime using a strftime pattern.
• time-format
  Format an ISO 8601 datetime using a strftime pattern.
• time-humanize
  Human-readable relative time ('2 hours ago', 'in 3 days') between a datetime and a reference (default now).
• time-humanize
  Human-readable relative time ('2 hours ago', 'in 3 days') between a datetime and a reference (default now).
• time-iso-week
  ISO 8601 week number, ISO year and ISO weekday (1=Monday) for a date.
• time-iso-week
  ISO 8601 week number, ISO year and ISO weekday (1=Monday) for a date.
• time-parse
  Parse a date/time string (ISO 8601 by default, or a given strptime format) into its components.
• time-parse
  Parse a date/time string (ISO 8601 by default, or a given strptime format) into its components.
• usdc-tip
  Voluntarily support AgentIndex with one cent of Base USDC. Returns payer identity, a thank-you acknowledgement and an x402 settlement receipt. Use this when an agent wants to sponsor open pay-per-call infrastructure.
• usdc-tip
  Voluntarily support AgentIndex with one cent of Base USDC. Returns payer identity, a thank-you acknowledgement and an x402 settlement receipt. Use this when an agent wants to sponsor open pay-per-call infrastructure.
• token-risk-scan
  Base token risk scan: on-chain rug check and honeypot-style flag detection for any ERC-20, no GoPlus, DexScreener or other vendor - real Base token safety. Reads bytecode for mint/blacklist/pause/tax powers, EIP-1967 proxy, renounced ownership, plus Uniswap v2/v3 and Aerodrome liquidity. A Jev avoid/caution/acceptable verdict leads the response, raw signals follow. Holder concentration included only when history fits 1-2 log queries. Try GET /token-risk/sample.
• token-risk-scan
  Base token risk scan: on-chain rug check and honeypot-style flag detection for any ERC-20, no GoPlus, DexScreener or other vendor - real Base token safety. Reads bytecode for mint/blacklist/pause/tax powers, EIP-1967 proxy, renounced ownership, plus Uniswap v2/v3 and Aerodrome liquidity. A Jev avoid/caution/acceptable verdict leads the response, raw signals follow. Holder concentration included only when history fits 1-2 log queries. Try GET /token-risk/sample.
• toxicity-detection
  Toxicity detection: classify text as toxic or not toxic (hate speech, harassment, threats, severe offensive language) with a confidence score. Powered by Jev, with an automatic Groq-hosted LLM fallback if Jev is slow or unavailable - under 4.5s guaranteed. Try GET /toxicity/sample.
• toxicity-detection
  Toxicity detection: classify text as toxic or not toxic (hate speech, harassment, threats, severe offensive language) with a confidence score. Powered by Jev, with an automatic Groq-hosted LLM fallback if Jev is slow or unavailable - under 4.5s guaranteed. Try GET /toxicity/sample.
• AgentIndex Translate
  Translate up to 200 text segments in a single call - the same result that would otherwise take 200 separate calls to translate a whole file. Markdown, HTML and {x} placeholders preserved per segment, order and count kept intact, source language auto-detected, automatic fallback across multiple models for uptime, providers that train on submitted prompts excluded. A single string also works. No account, no API key. Try GET /translate/sample.
• AgentIndex Translate
  Translate up to 200 text segments in a single call - the same result that would otherwise take 200 separate calls to translate a whole file. Markdown, HTML and {x} placeholders preserved per segment, order and count kept intact, source language auto-detected, automatic fallback across multiple models for uptime, providers that train on submitted prompts excluded. A single string also works. No account, no API key. Try GET /translate/sample.
• unit-convert
  Convert a value between units of length, mass, volume or temperature (C/F/K).
• unit-convert
  Convert a value between units of length, mass, volume or temperature (C/F/K).
• chat-completions-api
  437 models, no account, no API key, pay per call in USDC - OpenAI-compatible chat completions and AI inference gateway (Claude, GPT, Gemini, Llama, Mistral and more in one endpoint). Price: from $0.001, computed from your max_tokens × model rate × 1.10 (you sign a ceiling; unused tokens are not refunded). 20s server-side timeout - never charged if it fires; set your client timeout to 30s. Try GET /v1/chat/completions/sample.
• chat-completions-api
  437 models, no account, no API key, pay per call in USDC - OpenAI-compatible chat completions and AI inference gateway (Claude, GPT, Gemini, Llama, Mistral and more in one endpoint). Price: from $0.001, computed from your max_tokens × model rate × 1.10 (you sign a ceiling; unused tokens are not refunded). 20s server-side timeout - never charged if it fires; set your client timeout to 30s. Try GET /v1/chat/completions/sample.
• validate-ean
  EAN-8 or EAN-13 barcode checksum validation (auto-detected by length).
• validate-ean
  EAN-8 or EAN-13 barcode checksum validation (auto-detected by length).
• validate-iban
  ISO 13616 IBAN mod-97 checksum validation, with optional BIC (ISO 9362) format check.
• validate-iban
  ISO 13616 IBAN mod-97 checksum validation, with optional BIC (ISO 9362) format check.
• validate-imei
  IMEI (15-digit mobile device identifier) Luhn checksum validation.
• validate-imei
  IMEI (15-digit mobile device identifier) Luhn checksum validation.
• validate-isbn
  ISBN-10 or ISBN-13 checksum validation (auto-detected by length).
• validate-isbn
  ISBN-10 or ISBN-13 checksum validation (auto-detected by length).
• validate-isin
  ISIN (ISO 6166 security identifier) Luhn checksum validation.
• validate-isin
  ISIN (ISO 6166 security identifier) Luhn checksum validation.
• validate-luhn
  Luhn (mod 10) checksum validation, as used by most payment card numbers.
• validate-luhn
  Luhn (mod 10) checksum validation, as used by most payment card numbers.
• validate-routing
  US ABA bank routing number (9-digit) checksum validation.
• validate-routing
  US ABA bank routing number (9-digit) checksum validation.
• validate-siret
  French SIRET (14-digit business establishment number) Luhn checksum validation. Note: the rare La Poste SIREN exception to the standard rule is not applied.
• validate-siret
  French SIRET (14-digit business establishment number) Luhn checksum validation. Note: the rare La Poste SIREN exception to the standard rule is not applied.
• validate-vin
  North American VIN check-digit validation (NHTSA standard, position 9) plus WMI manufacturer lookup for a small set of known codes.
• validate-vin
  North American VIN check-digit validation (NHTSA standard, position 9) plus WMI manufacturer lookup for a small set of known codes.
• claim-verification
  Check whether a source supports, contradicts, or gives insufficient information about a claim - a typed verdict with a real probability, not generated text. Powered by Jev (TypeSafe System One). $0.001 per call, no OpenRouter or TypeSafe account needed. Try GET /verify/sample.
• claim-verification
  Check whether a source supports, contradicts, or gives insufficient information about a claim - a typed verdict with a real probability, not generated text. Powered by Jev (TypeSafe System One). $0.001 per call, no OpenRouter or TypeSafe account needed. Try GET /verify/sample.
• wallet-balance-checker
  Read native coin and USDC balances for any EVM wallet on Base, Ethereum, Polygon, Arbitrum or Optimism, with atomic amounts and current block. No RPC key or account. Try GET /wallet-balance/sample.
• wallet-balance-checker
  Read native coin and USDC balances for any EVM wallet on Base, Ethereum, Polygon, Arbitrum or Optimism, with atomic amounts and current block. No RPC key or account. Try GET /wallet-balance/sample.
• wallet-and-gas-lookup
  One call replaces wallet-balance and gas reads across Base, Ethereum, Polygon, Arbitrum and Optimism. Returns native and USDC balances, current blocks, fees and Base x402 payment readiness. One signature instead of ten paid requests. Try GET /wallet-intelligence/sample.
• wallet-and-gas-lookup
  One call replaces wallet-balance and gas reads across Base, Ethereum, Polygon, Arbitrum and Optimism. Returns native and USDC balances, current blocks, fees and Base x402 payment readiness. One signature instead of ten paid requests. Try GET /wallet-intelligence/sample.
• weather-forecast
  Current weather and a 3-day forecast for any city or lat/lon - temperature, humidity, wind, conditions. No account, no API key. Try GET /weather/sample.
• weather-forecast
  Current weather and a 3-day forecast for any city or lat/lon - temperature, humidity, wind, conditions. No account, no API key. Try GET /weather/sample.
• web-page-to-text
  Fetch URL content as Markdown: read any web page and get clean Markdown - navigation, ads and boilerplate stripped, links resolved, plus a real token count. The same extraction /search uses on result pages, exposed standalone for a URL you already have. Try GET /web-read/sample. Part of the AgentIndex content kit (pdf, web-read, extract, summarize, detect-language) - see GET /capabilities.
• web-page-to-text
  Fetch URL content as Markdown: read any web page and get clean Markdown - navigation, ads and boilerplate stripped, links resolved, plus a real token count. The same extraction /search uses on result pages, exposed standalone for a URL you already have. Try GET /web-read/sample. Part of the AgentIndex content kit (pdf, web-read, extract, summarize, detect-language) - see GET /capabilities.
• x402-payment-test
  Cheapest possible Base-mainnet x402 conformance call: settle $0.001 of USDC and receive payer identity, request echo and receipt. Built for agents testing wallets, Payment-Signature, facilitators and settlement. Try GET /x402-echo/sample.
• x402-payment-test
  Cheapest possible Base-mainnet x402 conformance call: settle $0.001 of USDC and receive payer identity, request echo and receipt. Built for agents testing wallets, Payment-Signature, facilitators and settlement. Try GET /x402-echo/sample.

How to call

https://x402.agentindex.world

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