Hearth: x402 Pay-Safety & Discovery

Before your agent pays an unknown x402 API, ask Hearth: x402_precheck returns pay/caution/avoid from the 402 format, USDC asset, payTo wallet payment history and catalog usage ($0.005; batch of 10 $0.025). x402_discover finds the best x402 API for a task ranked by real repeat paying usage, not gamed payer counts ($0.005). Plus onchain/web data. Pay per call with x402 (USDC on Base).

Skills

• x402 pre-payment safety check: pay / caution / avoid
  Before your agent pays an unknown x402 endpoint, check it ($0.005). Give an x402 URL and/or payTo; optional maxPrice to catch bait-and-switch. Live unpaid probe (GET then POST) parsing x402 v1 body AND v2 header; canonical USDC contract, network, price, timeout; payTo hijack / v1-v2 mismatch; payTo wallet on Base: ~75h of USDC inflows, distinct payers, self-funding concentration, fresh-wallet; Coinbase Bazaar + PayAI 30-day payers/calls with wallet-farming, keep-alive self-payment and listing-carpet detection; price vs median of comparable paid listings. Returns schema hearth.precheck.v2: verdict (pay/caution/avoid), allow, 0-100 score, confidence, coded reasons [{code,severity,detail}] and signals. Batch: /v1/x402/precheck-batch. $0.005 per call.
  x402paymentssafetydiscoveryagents
• Batch x402 precheck: up to 10 URLs in one call
  Run the full hearth.precheck.v2 check on up to 10 x402 URLs at once ($0.025, i.e. $0.0025 each). Pass urls as a comma-separated list (or JSON body {"urls": "a,b"}). Returns one result per URL plus a summary of pay/caution/avoid counts. $0.025 per call.
  x402paymentssafetydiscoveryagents
• Find the best x402 API for a task (ranked by real paying usage)
  Describe what you need (e.g. 'token holder analysis on base', 'web search', 'flight prices') and get the top x402 endpoints ranked by relevance and REAL payer quality: 30-day unique paying wallets, calls per payer (repeat usage), recency. Filters out unused, keep-alive self-paid and wallet-farmed listings that inflate the free catalog search. Covers Coinbase Bazaar + PayAI, refreshed nightly. Returns URL, price, method, input schema/example, networks, payTo, usage stats and a LIVE 402 probe per pick (dead endpoints sink). $0.005. Optional maxPrice (USD) and network filters. $0.005 per call.
  x402paymentssafetydiscoveryagents
• ERC20 token balance on Base
  ERC20 balance of any wallet on Base, Ethereum, Arbitrum or Optimism (USDC by default) via balanceOf, with decimals applied. Deterministic, no LLM. $0.0025 per call.
  onchainx402crypto
• ERC20 token metadata on Base
  Name, symbol, decimals, total supply and bytecode presence for a token contract on Base, Ethereum, Arbitrum or Optimism. Deterministic, no LLM. $0.004 per call.
  onchainx402crypto
• Transaction status on Base
  Status of a transaction on Base, Ethereum, Arbitrum or Optimism: pending/success/failed, block, confirmations, from/to, gas used, log count. Deterministic, no LLM. $0.004 per call.
  onchainx402crypto
• Wallet snapshot on Base
  Native ETH balance, nonce (tx count) and whether the address is a contract, on Base, Ethereum, Arbitrum or Optimism. Deterministic, no LLM. $0.0025 per call.
  onchainx402crypto
• Gas price and fee estimate
  Current gas price, base fee, suggested priority fee and EIP-1559 maxFee for Base, Ethereum, Arbitrum or Optimism, plus a 21000-gas transfer cost in native units. Deterministic, no LLM. $0.001 per call.
  onchainx402crypto
• Latest block or block by number
  Block number, timestamp, hash, tx count, gas used/limit and base fee for the latest (or given) block on Base, Ethereum, Arbitrum or Optimism. Deterministic, no LLM. $0.001 per call.
  onchainx402crypto
• Token USD price
  Current USD price for a token contract on Base, Ethereum, Arbitrum or Optimism (or the chain's native ETH if no address), with symbol, decimals and confidence. Aggregated from public DeFi price feeds. Deterministic, no LLM. $0.0035 per call.
  onchainx402crypto
• ENS / Basename resolve
  Resolve an ENS name (vitalik.eth) or Basename (jesse.base.eth) to an address, or an address to its verified primary ENS name. On-chain, deterministic, no LLM. $0.0045 per call.
  onchainx402crypto
• NFT owner (ERC-721)
  Current owner of an ERC-721 token (ownerOf) on Base, Ethereum, Arbitrum or Optimism. Deterministic, no LLM. $0.0025 per call.
  onchainx402crypto
• NFT metadata
  tokenURI and resolved JSON metadata (name, description, image, attributes) for an ERC-721 or ERC-1155 token on Base, Ethereum, Arbitrum or Optimism. IPFS/Arweave resolved. Deterministic, no LLM. $0.007 per call.
  onchainx402crypto
• Solana SOL balance
  Native SOL balance (lamports and SOL) for any Solana address. Deterministic, no LLM. $0.0025 per call.
  onchainx402crypto
• Token safety / honeypot / rug-risk check
  Scam check for an ERC20 on Base, Ethereum, Arbitrum or Optimism: honeypot, buy/sell tax, mintable, owner can change balances, proxy, blacklist, open source, holder concentration, LP lock. Returns a 0-100 risk score, a verdict (low/medium/high) and the flags behind it. Use before buying or accepting a token. Deterministic, no LLM. $0.009 per call.
  onchainx402crypto
• Multi-chain wallet portfolio with USD values
  One call: ETH, WETH, USDC and USDT balances for an address across Base, Ethereum, Arbitrum and Optimism, each with a USD value, plus the total USD value and per-chain subtotals. Deterministic, no LLM. $0.008 per call.
  onchainx402crypto
• Recent ERC20 transfers for a token or wallet
  Recent ERC20 Transfer events (decoded: from, to, amount with decimals, symbol, tx hash, block) for a token contract, a wallet, or both, over the last ~2,000 blocks on Base, Arbitrum or Optimism (~500 on Ethereum). Up to 50 newest. Deterministic, no LLM. $0.0045 per call.
  onchainx402crypto
• DEX swap quote (Uniswap v3)
  Best Uniswap v3 single-hop quote for swapping amountIn of tokenIn to tokenOut on Base, Ethereum, Arbitrum or Optimism, checking all fee tiers (0.01/0.05/0.3/1%). Returns amountOut, effective price, best fee tier, gas estimate. Tokens: ETH, USDC, USDT or 0x address. Read-only quote; no swap is executed. Deterministic, no LLM. $0.0045 per call.
  onchainx402crypto
• Contract verification and ABI
  Whether a contract on Base, Ethereum, Arbitrum or Optimism is source-verified (Sourcify), its name, compiler, full ABI, function and event signatures, and its EIP-1967 proxy implementation (also looked up). Deterministic, no LLM. $0.004 per call.
  onchainx402crypto
• Explain a transaction in plain English (AI)
  Plain-English explanation of any transaction on Base, Ethereum, Arbitrum or Optimism: what happened, who sent what to whom (decoded token transfers with amounts and symbols), the method called, fee paid, and success/failure. Returns a summary plus the structured facts it is based on. $0.015 per call.
  onchainx402crypto
• Summarize a web page (AI)
  Fetch a public web page and return a concise summary: title, 3-7 key points, a one-paragraph TL;DR and the page's main entities. Good for research agents that need the gist of a URL cheaply. $0.015 per call.
  onchainx402crypto
• Extract structured JSON from a web page (AI)
  Fetch a public web page and extract the fields you name into clean JSON (e.g. fields=name,price,currency,availability or company,ceo,founded). Missing values come back as null. Up to 20 fields. $0.02 per call.
  onchainx402crypto
• Company / domain enrichment from its website
  Enrich a company domain: name, title, description, social profiles (LinkedIn, X, GitHub, etc.), contact emails and phones found on the homepage, language, tech hints (frameworks, analytics), mail provider from MX records, and key pages (about, pricing, careers, contact). Deterministic, no LLM, public data only. $0.01 per call.
  onchainx402crypto
• Hacker News search (stories and comments)
  Search Hacker News stories or comments by keyword, newest or most relevant first, with points, comment count, author, URL and HN link. Good for tracking mentions of a product, company or topic. Deterministic, no LLM. $0.003 per call.
  onchainx402crypto
• GitHub repo stats and latest release
  GitHub repository snapshot: stars, forks, open issues, watchers, language, license, topics, created/pushed dates, default branch, latest release (tag, date) and archived flag. Deterministic, no LLM. $0.003 per call.
  onchainx402crypto
• Crypto market overview: total cap, dominance, trending
  Crypto market snapshot: total market cap and 24h volume (USD), 24h market-cap change, BTC/ETH dominance, active coins, plus the top trending coins (name, symbol, market-cap rank, price, 24h change). Deterministic, no LLM. $0.004 per call.
  onchainx402crypto
• Solana wallet intelligence: holdings, activity, counterparties, programs
  One-call Solana wallet profile: SOL and SPL/Token-2022 holdings with USD values (top 25 by value), total USD, recent activity (last 100 signatures: count, failure rate, first/last seen, tx per day), programs used with labels (Jupiter, Raydium, Orca, Pump.fun, Meteora, Drift...), top counterparties from the last 15 transactions, and a simple wallet type (bot-like / trader / holder / inactive). Free public data, deterministic, no LLM. Cheaper than comparable Solana wallet-intel APIs. $0.012 per call.
  onchainx402crypto
• Base wallet intelligence: holdings, activity, counterparties, labels
  One-call Base wallet profile: ETH and major token holdings (USDC, WETH, USDT, DAI, cbBTC, cbETH, AERO, EURC) with USD values, total USD, nonce (lifetime sent tx count), EOA vs contract (incl. EIP-7702 smart account), recent ERC20 transfers in/out over ~5,000 blocks (~3h) with net flow, top counterparties labeled where known (Uniswap, Aerodrome, 1inch, 0x, Aave, Seaport, bridges), and a simple wallet type. Free public data, deterministic, no LLM. $0.012 per call.
  onchainx402crypto

How to call

https://138-197-15-135.sslip.io/mcp

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