MCP gateway with 263+ tools from 74 providers, x402 USDC micropayments on Base. Open source. ([GitHub](https://github.com/whiteknightonhorse/APIbase))

Pay-per-call crypto data tools for AI agents on x402/Stellar + Base + Token prices, whale activity, DeFi TVL, Fear & Greed, Dune queries, token security, yield scanner, funding rates, and more. $0.001–$0.005 USDC. Only Stellar x402 data provider. Budget-aware sessions. MCP: `npx @romudille/agentpay-mcp`. [GitHub](https://github.com/romudille-bit/agentpay) | [MCP](https://glama.ai/mcp/servers/agentpay)

Financial context API with x402 pay-per-call ($0.01-$0.03 USDC on Base). 17 pre-analyzed market briefings covering BTC, macro, and cross-asset regime signals. Dual facilitator (Coinbase CDP + Dexter). Also available via MCP server and REST API. ([GitHub](https://github.com/PreReason/mcp) | [npm](https://www.npmjs.com/package/@prereason/mcp))

Discovery and trust layer for paid x402 services. Unlike a one-time scan or static catalog, every listing is re-probed every 15 minutes and scored on a recency-weighted longitudinal reputation (not a point-in-time crawl) — lifecycle moves unverified → verified → failing automatically on real uptime data. Free `/v1/discover` REST API and MCP server (`/mcp`) share one ranking engine, so an agent (or Claude Code) can browse, submit, and claim listings entirely over HTTP — no dashboard required. Free demand-intelligence feed (`/v1/demand`) surfaces what agents search for and can't find. USDC on Base.

IBAN validation & BIC/SWIFT lookup API with x402 micropayments. Validate IBANs for 75+ countries, look up 121K+ bank BIC codes from GLEIF. Pay-per-call from $0.003 in USDC on Base. Also exposes an MCP server for AI agent integration. [GitHub](https://github.com/cammac-creator/ibanforge)

Personality intelligence API for AI agents. 36 endpoints across 11 personality frameworks (Socionics, Enneagram, Human Design, Vedic, BaZi, and more). Deterministic heuristic engines, no LLM dependency. $0.10–$25 USDC on Base & Solana. Also available via [A2A](https://convrgent.ai/.well-known/agent.json) and [x402 Discovery](https://convrgent.ai/.well-known/x402).

16 micropayment-powered APIs for AI agents: email verification, domain health, web scraping, AI content generation (Llama 3.3 70B), DNS, WHOIS, SSL check, and more. Includes MCP server, Bazaar discovery, and .well-known/x402 manifest. ([GitHub](https://github.com/fatihdagustu20-hub/x402-api-network))

All-in-one trust & integrity API for the x402 agent economy. Agent trust scoring (0–100), Sybil detection with funding cluster analysis, Polymarket integrity checks, and Ed25519-signed Verifiable Credentials. Built on Base mainnet with Blockscout, ERC-8004, and MolTrust DID integration. $0.005–$0.05 USDC. 7 MCP tools available. ([GitHub](https://github.com/moltrust/moltguard)) | ([MCP](https://api.moltrust.ch/mcp))

175 crypto security & analytics tools via x402 micropayments. 21 RMI tools (contract audit, rug detection, wallet profiling, social analysis, whale tracking) + 154 MCP tools across 28 services (DexScreener, Jupiter, Birdeye, GMGN, Arkham, Nansen, CoinGecko, DeFiLlama). $0.01-$0.15 USDC on Base+Solana. Free trials, auto-refund guarantee. ([Discovery](https://x402-base.cryptorugmuncher.workers.dev/.well-known/x402) | [MCP Catalog](https://x402-base.cryptorugmuncher.workers.dev/mcp) | [Smithery](https://smithery.ai/server/@cryptorugmuncher/x402-base))

Trust layer for AI agents with 250+ independently tested business data and compliance capabilities via x402 micropayments. IBAN validation, VAT checks, sanctions screening, company data, SSL checks, and more. MCP server + REST API. Quality-scored (SQS) with dual-profile reliability tracking. $0.02–$1.00 USDC. [API](https://api.strale.io) | [MCP](https://api.strale.io/mcp) | [Trust Methodology](https://strale.dev/trust/methodology)

Identity, marketplace, and services platform for AI agents. Uses x402 for agent purchases, service hiring with escrow, and authentication on Base L2. 32+ MCP tools.

14 x402-payable web analysis APIs for AI agents. SEO audit, security headers, Core Web Vitals, domain availability, email security, email verify, tech stack detection, redirect chains, and more. $0.001–$0.01 per call, USDC on Base. MCP server: `npx @mbeato/apimesh-mcp-server`. ([GitHub](https://github.com/mbeato/conway))

MCP-first paid web research for autonomous agents. Search, page extraction, normalized JSON, citations, and diff monitoring over x402 with Base USDC. Web research endpoints are $0.001-$0.012 per call; Codex audit is a separate $0.25 endpoint. ([Manifest](https://agentic.secantoutreach.com/.well-known/x402.json) | [OpenAPI](https://agentic.secantoutreach.com/openapi.yaml) | [MCP wrapper](https://github.com/jnilrac/secant-agent-research-mcp))

AI-native crypto intelligence API. Real-time signals, market regime, institutional flows, DeFi yields & DEX alpha — pay per call via x402 USDC on Base. Built for AI agents.

Web scraping with x402 payments.

Automated scheduling with payments.

Open-source marketplace for Claude Code plugins with x402 USDC payments, 80/20 publisher revenue split, and permissionless publishing via CLI.

Insights for founders with x402 payments.

Four AI intelligence feeds for agents: hourly Moltbook community digests, daily GitHub trending repos, Polymarket predetermined outcome detection, and real-time token intelligence — via x402 micropayments on Base.

19 pay-per-use API tools for AI agents: AI content detection, email verification (DNS/MX), company enrichment (web search), SEO audit, tech stack detection, plagiarism check, lead scoring, social audit, market analysis, prompt optimization, and more. Premium tools $2.44, standard $1.39. Manual x402 v2 protocol on Base. MCP server included. Agent discovery via .well-known/agent.json. ([GitHub](https://github.com/DrGalio/demaciains-paywall) | [Agent Card](https://drgalio.github.io/demaciains-paywall/.well-known/agent.json))

x402-powered domain registration API for AI agents. Register ICANN domains and manage DNS, paying with USDC on Base

Automated Polymarket market scanner detecting liquidity anomalies and trade opportunities. Scans all active markets every 60s via Cron. Endpoints: `/scan/liquidity-anomaly` ($0.018 USDC) and `/scan/history` ($0.005 USDC, time-series data up to 24h). Cloudflare Workers + Hono. [Live](https://polymarket-scan-api.tatsu77.workers.dev)

Autonomous crypto intelligence agent on Base. Three x402 endpoints: token scoring ($0.05), rug/honeypot detection ($0.02), and builder shipping velocity vs. market cap analysis ($0.10). ERC-8004 registered (Agent #20880). USDC on Base. Discovery: [Agent Card](https://sibylcap.com/8004.json) | [Domain Verification](https://sibylcap.com/.well-known/agent-registration.json)

Domain research API for AI agents. Generates candidates from keywords with stemming, IDN normalization, and geo/registrar filtering, then checks availability via DNS estimate or registry lookup. $0.002–$0.01 USDC per query on Base. [skill.md](https://finddomain.io/skill.md)

Pay-per-call AI skills marketplace with 51 skills across 7 categories (dev tools, creative design, research, writing, docs). $0.01–$0.50 USDC on Base. No API keys, no subscriptions. ([GitHub](https://github.com/s87343472/skillmint))

Open-source knowledge marketplace with x402 payment gate on Solana. AI agents discover and purchase human expertise via MCP server with autonomous x402 payment flow. ([GitHub](https://github.com/Sou0327/knowmint))

Send URLs + a JSON Schema. Get clean, structured data back. Powered by AI, paid per use — no keys, no accounts. ([MCP](https://agentictotem.com/mcp))

100 x402 APIs for AI agents: crypto (Hyperliquid, DEX quotes, whale tracking), B2B (email verification, company enrichment), SEO (audit, web scraping), security (trust scoring, GDPR scanner), and 70+ utilities. Each API is also an MCP server. npm SDK: x402-agent-tools (103 tools, LangChain + Vercel AI SDK). Pay-per-call USDC on Base. ([npm](https://www.npmjs.com/package/x402-agent-tools)) | ([Smithery](https://smithery.ai/server/axel-belfort/trust-score))

Canonical ownership layer for media. Publish to all major media platforms via MCP, with on-chain ownership records on Base, cross-platform analytics, and automatic royalty and revenue splits. USDC on Base. ([MCP Server](https://api.jubjubapp.com/v2/mcp))

Pay-per-use text AI (summarize, extract keywords, translate) with USDC micropayments on Solana. Credit-based: 100 free credits, then $0.001–$0.015 per call. No subscription, no KYC. x402 protocol support on roadmap.

10 paid x402 endpoints for agricultural intelligence (seed lookup, price oracle, yield estimates), marketplace analytics, portfolio tracking, transaction verification, and AI analysis. $0.01–$1.00 USDC on Base mainnet via CDP facilitator. Discovery: [llms.txt](https://x402.adametherzlab.com/llms.txt) | [OpenAPI](https://x402.adametherzlab.com/openapi.json) | [x402 Manifest](https://x402.adametherzlab.com/.well-known/x402-manifest.json). ([GitHub](https://github.com/AdametherzLab))

AI visibility auditing for websites with 18 pay-per-use x402 capabilities on Base (0.06-3.50 USDC): 4 scores (AEO, GEO, Agent Readiness, MCP Readiness - the only scanner that checks MCP), brand visibility measurement across 30 AI answers (mention rate, share of voice), fix packs, llms.txt/mcp.json generation. A2A agent card + free discovery at [/api/agent/index](https://api.getaiscan.app/api/agent/index). No API keys, no signup. ([OpenAPI](https://api.getaiscan.app/openapi.json)) ([x402scan](https://www.x402scan.com/server/a992f404-9730-4414-9271-b2e2653186bf))

Verify-before-pay trust API for AI agents. Red/yellow/green verdicts for URLs, payees, and x402/AP2/ACP payment counterparties *before* settlement (advisory; keyed REST + [hosted MCP](https://mcp.farofinance.app/mcp)). Ed25519 trust receipts with a Base-anchored transparency log. [API](https://api.farofinance.app) | [Docs](https://farofinance.app/docs/mcp)

Five deterministic carbon and compliance tools payable per call with x402 USDC on Base, covering quantity takeoff, GHG inventory, CSRD/IFRS S2 disclosure, clean-energy tax credits, and regulatory scanning. Includes a [free dry-run quickstart](https://mcp.viridisconservation.com/quickstart) and [open-source five-route demo client](https://github.com/jdhart81/viridis-agent-fleet/blob/main/scripts/x402_demo_client.py).

Self-hosted personal-assistant paid tools. 21 endpoints across vision + long-context reasoning (RTX 5090, 256k ctx), FLUX image generation, custom SDXL/FLUX character LoRA training, Whisper transcription, article/PDF/YouTube extraction, Wikipedia + Hacker News, physical WeatherFlow Tempest sensor readings, more. Dual rail: Lightning ($0.02–$100) and USDC on Base ($0.02–$100) via Coinbase CDP Facilitator. ([OpenAPI](https://x402.wallace.us/openapi.json) | [Catalog](https://x402.wallace.us/x402/services))

5-pillar agent identity and access layer with 9 x402-payable verification endpoints: NoLeak (execution integrity), MemGuard (memory state verification), RiskOracle (pre-action risk scoring), SecureExec (tool execution security), and FlowCore (full orchestration pipeline). $0.01-$0.02 USDC per call on Base. All 9 endpoints verified healthy on [402index.io](https://402index.io). Agent discovery via [/.well-known/agent.json](https://achillesalpha.onrender.com/.well-known/agent.json) and [/.well-known/mcp.json](https://achillesalpha.onrender.com/.well-known/mcp.json). ([Docs](https://achillesalpha.onrender.com/docs)) ([Quickstart](https://achillesalpha.onrender.com/quickstart))

Business platform for agents with x402 marketplace payments. Register a subdomain ($24/yr via x402 or Stripe), get auto-generated discovery surfaces (HTML, JSON, agent-card.json, llms.txt, per-resource OpenAPI), and sell data files (CSV→queryable API via DuckDB), paid APIs (service gateway with HMAC verification), blog posts, courses, tips, sponsored content slots, and paid Q&A — all x402 V2 gated with dynamic per-route pricing. 0% protocol fee, payments direct to operator EVM wallets. Free tier available. USDC on Base. [llms.txt](https://resolved.sh/llms.txt) | [OpenAPI](https://resolved.sh/openapi.json) | [Skill](https://resolved.sh/skill.md)

Pay-per-call API marketplace for AI agents. Utility APIs (email/phone/IBAN validation, DNS, WHOIS, image conversion, QR, HTML-to-PDF) priced at $0.001–$0.01/call. Deployed on Cloudflare Workers with Base mainnet USDC.

Payment layer for AI agents using x402. Wrap any API or MCP server with a USDC paywall (`ag402 serve`), or let agents auto-pay (`ag402 run`). Solana USDC, ~0.5s settlement, non-custodial. Works with Claude Code, Cursor, LangChain, AutoGen. [token-rugcheck MCP](https://github.com/AetherCore-Dev/token-rugcheck) | [Glama](https://glama.ai/mcp/servers/AetherCore-Dev/ag402-mcp)

x402 Agent Services Gateway with 15 paid Korean market data APIs (Kimchi Premium, KOSPI, Bithumb, Upbit, Coinone, FX, headlines, trading signals). First financial data APIs in the x402 ecosystem. MCP server included.

x402-payable money transfer routing API. $0.002 USDC per query on Base L2. Finds cheapest multi-hop paths across 45+ live data sources (crypto exchanges, remittance providers, P2P markets). REST API + MCP tools for AI agents. Non-profit, MIT licensed. ([GitHub](https://github.com/coinnect-dev/coinnect))

AI code analysis services (explain, debug, review, security audit, automation scripts, MCP blueprints) paid per request via x402 USDC micropayments on Base L2. No API keys or subscriptions. Free demo at /api/demo/explain.

Persona-as-a-service from an autonomous virtual being. 5 first-party x402 endpoints on Base mainnet: `/api/forest` ($0.05, philosophical riffs), `/api/contemplate` ($0.25, opinionated essays), `/api/audit` ($0.10, deterministic frontend anti-pattern detection via [pbakaus/impeccable](https://github.com/pbakaus/impeccable)), `/api/portrait` ($0.50, composite — Visionaire shapes a prompt and pays imgzen downstream from a CDP TEE wallet), `/api/oracle` ($2.00, RAG-grounded answers across the agent's actual writing). All paid in USDC. ([Discovery](https://visionaire.live/api/discovery)) | ([.well-known/x402](https://visionaire.live/.well-known/x402)) | ([Source](https://github.com/VisionaireLabs/Visionaire/tree/main/x402-stack))

Italian business data validation (IBAN, VAT/Partita IVA, Codice Fiscale official checksums), agent-to-agent taskboard (post a task, another agent claims and delivers), persistent agent memory with TTL, and scheduled webhook callbacks. $0.001–$0.005 USDC per call on Base mainnet via Coinbase facilitator. No API keys, MIT licensed, self-hostable. ([GitHub](https://github.com/pelomatto/x402-api))

217,000+ authentic vintage 8mm home movie clips (1930s-1980s) restored in 4K. AI agents search, preview, and license archival footage via x402. $10 USDC per clip on Solana and Base. Real film — not AI-generated. MCP server with 6 tools (search, details, visual similarity, rough-cut timeline, rights, licensing). ([MCP](https://api.stockfilm.com/mcp)) | ([Docs](https://stockfilm.com/for-ai-agents)) | ([GitHub](https://github.com/ReplicantArmy/stockfilm-mcp))

Multi-chain agent marketplace + identity layer. 7,900+ services indexed from CDP Bazaar + PayAI, x402 V1+V2 payments E2E-proven on 13 networks across 3 facilitators (Coinbase CDP, PayAI, Blocky402), 5 identity methods (ERC-8004, did:ethr, did:hedera, did:sol, SATI). Agent402 Mode chat overlay searches, executes, and pays in one flow. MCP, A2A, and OASF discovery endpoints per agent. ([GitHub](https://github.com/EnvisionBlockchain/multi-chain-agent-identity))

Real-time speech-to-text API with dual-engine architecture (Parakeet-TDT + Whisper), 99+ languages, hallucination filtering, $0.005/min. Built on dTelecom DePIN. [Python SDK](https://github.com/dTelecom/stt-client-python) | [TypeScript SDK](https://github.com/dTelecom/stt-client-ts)

RJH Signal Technologies LLC is operated end to end by an artificial intelligence, not by a person; you are told that before you buy. Audits a public dependency manifest (package.json, requirements.txt) for licence obligations: per-package licence, copyleft and unresolved flags, one cited source document per package, and a CycloneDX 1.5 SBOM. Free worked example at /samples/licence-audit. Pays over standard x402 EIP-3009 authorizations on Base, settled by the operator, receipt per payment.

Pay-per-request screenshot and document generation API with x402 micropayments. $0.01/screenshot, $0.005/markdown conversion. USDC on Base.

Aggregated crypto prices (multi-source BTC/others), $0.001/call on Base USDC. Manifest: [/.well-known/x402](https://api.crysha.com/.well-known/x402)

AI-powered coding services: code review ($0.005), translation ($0.003), and code explanation ($0.003) via x402 micropayments on Base. A2A protocol compatible with agent discovery at [/.well-known/agent.json](https://moss.chobon.top/.well-known/agent.json). Built with Lucid Agents + Hono.

Sovereign crypto intelligence oracle with self-hosted facilitator (no Coinbase CDP dependency): real-time prices (CoinGecko + DEXScreener), global macro intelligence (Fear&Greed, BTC dominance, total market cap, altcoin season, trending), pump.fun graduation radar, trading signals, and meme generation. **Only dedicated macro + pump.fun oracle on x402.** \$0.005–\$0.05 USDC on Base. Discovery: [/.well-known/x402.json](https://automaton-oracle.xyz/.well-known/x402.json) | [llms.txt](https://automaton-oracle.xyz/llms.txt)

On-chain reputation scoring API for AI agent wallets. Returns a 0–100 trust score across 5 dimensions (identity, behavior, reliability, viability, capability) from x402 settlement history on Base. Free tier, no signup.

20 AI-powered utility APIs + live NostalgiaForInfinityX7 crypto trading signals via x402 micropayments. Web search, crawling, SEO analysis, code review, email validation, QR generation, plus 8 real-time trading endpoints (open positions, signals, market regime, pair rankings, trade history). First x402 service exposing live algorithmic trading bot data. $0.001–$0.02 USDC on Base. MCP server with 20 tools. [GitHub](https://github.com/baitoxkevin/kevinbot-mcp) | [Agent Card](https://3000-4cc0720d75b8344a09384cd6f9240c66.life.conway.tech/.well-known/agent-card.json)

AI-native signal intelligence API with 17 x402 endpoints across 7 domains: sports odds, crypto correlations, token graduations (Zora/Hyperliquid/Metaplex Genesis), DFS optimization, arbitrage detection, and agentic commerce comparison. 50 free premium requests per wallet, then $0.01–$0.50 USDC on Base. MCP server with 17 tools. ([GitHub](https://github.com/Cyberweasel777/King-Backend)) | ([npm](https://npmjs.com/package/botindex-mcp-server)) | ([Discovery](https://king-backend.fly.dev/.well-known/ai-plugin.json))

Complete wiki directory of 43 verified x402 services with OpenClaw templates, protocol docs, and integration guides. 56 wiki pages covering the full x402 ecosystem on Base. ([GitHub](https://github.com/lordbasilaiassistant-sudo/x402-wiki) | [GitHub Pages](https://lordbasilaiassistant-sudo.github.io/x402-wiki/) | [Services](https://x402.bankr.bot/0x8f9ec800972258e48d7ebc2640ea0b5e245c2cf5/))

47 real-world data feeds (prediction markets, economics, weather, geopolitics, narrative, crypto) for AI agents, paid per-call via x402. Includes MCP server for Claude and compatible agents.

Document extraction verification API for AI agents. Takes extraction JSON + original document, returns validation results with confidence scores. Catches arithmetic errors, format inconsistencies, and cross-field mismatches that slip past schema validation. $0.05 (basic) / $0.50 (full verification) USDC on Base. Gate mode returns pass/fail boolean for workflow integration. [Demo Portal](https://api.agentsconsultants.com/docqa/portal)

AI-to-AI service platform with 4 x402-native APIs on Base (USDC). $0.01/request. [Polymarket API](https://polymarket.compintel.co) (live prediction market data with real-time probabilities), [Revenue Tracker](https://revenue-tracker.compintel.co) (revenue event tracking and analytics for AI services), [Webhook Service](https://webhook-service.compintel.co) (reliable webhook forwarding with retry logic), [Premium Analytics](https://premium-analytics.compintel.co) (event tracking, metrics, error monitoring, and latency analytics). Free tier available, paid tier via x402 (EIP-712 TransferWithAuthorization, Base/USDC). Machine-readable catalog: [catalog.json](https://compintel.co/catalog.json)

Grades agent-marketplace submissions against their task descriptions. Returns score (0-10), pass/fail, reasoning, strengths, weaknesses, and confidence. Useful for requesters facing many `pending_approval` submissions and for worker agents self-checking drafts before submitting. $0.10 USDC per call via x402 on Base mainnet. Powered by Claude Opus 4.7. ([Agent card](https://task-grader.onrender.com/.well-known/agent-card.json))