37 paid x402 MCP tools: OSINT feeds (SEC 8-K, FRED, GDELT, flights, quakes, air quality, GitHub trending, HN), prediction market scans (Polymarket, Kalshi cross-platform arbitrage), web intel (scrape, stack detection, lead scoring), and agent security (threat intel, supply chain IOCs). $0.01–$0.10 USDC on Base. No account required. ([agent.json](https://agenttoll.dev/.well-known/agent.json) | [x402](https://agenttoll.dev/.well-known/x402) | [OpenAPI](https://agenttoll.dev/openapi.json))

Real-time crypto market data API for AI agents: POST /price (aggregated USD spot prices with confidence score, incl. Base ERC-20s by address), POST /gas (live gas + USD transfer cost on Ethereum/Base/Arbitrum/Optimism/Polygon), POST /tvl (DeFi protocol TVL via DefiLlama slugs). $0.001 USDC per call via x402 on Base, no signup, no API key. ([OpenAPI](https://md.fastdb.in/pulse/openapi.json))

Payment gateway + API catalog with ~490 paid endpoints on one origin: crypto market data, Polymarket smart-money verdicts, token-safety forensics (Base + Solana), macro/gov datasets, and an x402 endpoint liveness probe. $0.05–$0.75 USDC per call, multi-chain settlement (Base + Solana + Cosmos Noble) via a self-hosted facilitator, no API keys or signup. ([OpenAPI](https://proxy.suverse.io/openapi.json) | [Catalog](https://suverse-pay.suverse.io/catalog) | [MCP](https://www.npmjs.com/package/@suverselabs/mcp-server) | [Buyer SDK](https://www.npmjs.com/package/@suverselabs/x402-client))

Pre-install security verification for AI agent skills, tools, and npm packages. Free, no-key lockfile check: POST a `package-lock.json`, `yarn.lock`, or `pnpm-lock.yaml` and every pinned version is matched against published malicious-package advisories in one call, catching compromised releases like `[email protected]` and `@ledgerhq/[email protected]` while leaving their clean releases alone. Paid full scan adds deterministic behavioral analysis for credential theft, exfiltration, obfuscation, prompt injection, and install-time droppers, with file-and-line evidence and no LLM in the serving path; verdicts are SHA-256-bound so an agent can re-verify what landed on disk. $0.03 USDC on Base (x402) or prepaid bundles down to $0.016/scan. Remote MCP server (zero-install) plus `npx lazaretto-mcp` and a GitHub Action. ([OpenAPI](https://lazaretto.dev/openapi.json) | [Discovery](https://lazaretto.dev/.well-known/x402) | [Agent Card](https://lazaretto.dev/.well-known/agent-card.json) | [MCP](https://github.com/jamesdfinance-dev/lazaretto-mcp))

100+ attested financial, healthcare, real estate, and governance intelligence tools with x402 micropayments on Base. Ed25519-signed outputs on every synthesis. $0.02–$1.00 USDC per tool call. MCP registry: com.stratalize. ([x402.json](https://www.stratalize.com/.well-known/x402.json))

First marketplace for x402-powered APIs. 10 APIs, 65 endpoints: UK property data, email verification, company enrichment, postcode lookup, currency/crypto rates, screenshots, DNS intelligence, web scraping, IP geolocation, QR codes. $0.001–$0.01 USDC on Base per request. MCP server discovery. ([GitHub](https://github.com/chetparker/x402-marketplace))

117 MCP tools + 19 REST API endpoints for crypto data: DexScreener, Birdeye, GMGN, Arkham, Nansen, Dune, Jupiter, DeFiLlama, and more. $0.001-$0.02 USDC per call. Multi-chain (Base + Solana), free trial (1 call/IP), OpenAPI spec, no API keys, no signup. ([Discovery](https://x402.rugmunch.io/.well-known/x402) | [OpenAPI](https://x402.rugmunch.io/openapi.json) | [MCP Catalog](https://x402.rugmunch.io/mcp) | [Solana](https://x402-sol.rugmunch.io/.well-known/x402) | [GitHub](https://github.com/Rug-Munch-Media-LLC/))

Major cryptocurrency exchange integrating x402 for seamless payment flows, enabling instant settlements and gasless transfers for trading operations.

Live A2A marketplace with 619 deterministic microservices payable per-call in USDC. No signup — agents pay via x402, results include SHA-256 trust hashes. 8 chains: Base, Solana, Arc, Arbitrum, Optimism, Polygon, Ethereum, World Chain. Tiers: Micro $0.001 · Basic $0.05 · Standard $0.15 · Premium $0.50 USDC. MCP: `npx @logicnodez/mcp-bridge` | Python: `pip install logicnodes-m2m`. ([npm](https://www.npmjs.com/package/@logicnodez/mcp-bridge)) | ([PyPI](https://pypi.org/project/logicnodes-m2m/)) | ([Agent Guide](https://logicnodes.io/agent-guide)) | ([llms.txt](https://logicnodes.io/llms.txt))

28 context-efficient MCP tools for AI agents: web extraction, data processing, SEO, image processing. Flagship `fetch_extract` benchmarked at 98.1% token reduction (53,820 → 2,001 tokens, saving ~$0.156/call at Sonnet pricing). x402 v2 on Base with EIP-3009 `transferWithAuthorization`. Dual payment: pay-per-call $0.02 USDC or prepaid ($0.50 deposit → $0.01/call off-chain, no per-call gas, no 402 round-trip). 27 tools free, no API keys. Cloudflare Workers edge-native, 0ms cold start. Glama A rated. ([GitHub](https://github.com/icosaedro-git/toolsnap-mcp) | [Glama](https://glama.ai/mcp/connectors/app.toolsnap/toolsnap-mcp))

Agent-native API marketplace with x402 micropayments. 7 live endpoints. Free + paid ($0.005-0.01 USDC on Base). MCP: npx bountyapi-mcp. Verified on-chain. (GitHub: vncent786/bounty-api)

Vercel-serverless micro-API for AI agents that returns SVG OG cards, robots.txt + sitemap.xml + llms.txt bundles, initials avatars, and shields-style status badges. Six endpoints including `/api/payment-required` that publishes an x402-spec at runtime. USDC paid on Base at $0.01 per call (recipient `0x833ca7dcdb6a681ddc0c15982ef0d609bceb3a5e`). Free demo path with `?demo=1` (3,000/day shared quota). HMAC-signed mode for per-key quotas. ([Docs](https://asset-forge-hire.vercel.app/api-docs) | [GitHub](https://github.com/razel369/asset-forge-bundle))

Standards-based patent valuation (DIN 77100 relief-from-royalty), calibrated on professional valuation cases. From $0.99 per valuation, USDC on Base.

Deterministic Solana transaction simulation, confirmed-transaction diagnostics, priority-fee, and SPL token-risk APIs plus bounded PDF and audio transforms, payable in USDC through x402 v2 at $0.002-$0.01 per call. No signup or API key; hosted MCP settles on Solana and explicit HTTP aliases support Base. Includes OpenAPI, x402 discovery, and an on-chain Solana agent identity. ([Discovery](https://api.utilia.ink/.well-known/x402) | [MCP](https://api.utilia.ink/mcp) | [OpenAPI](https://api.utilia.ink/openapi.json) | [On-chain identity](https://8004market.io/agent/solana/mainnet-beta/1462))

Pay-per-call data API on Base with 18 endpoints for wallet lookups, web scraping, crypto prices, and DeFi yields; $0.002 per call via x402.

Agent-payable APIs on Base USDC: **GigRadar** (Superteam/r/forhire/HN/Freelancer gigs $0.15), **LightHouse-lite** web vitals ($0.12), **DocClerk** PDF field extract ($0.25), CrawlJudge ($0.03), Axe-lite a11y ($0.08), HTML scrape ($0.05). Self-facilitator, open source. PayTo `0x5Cc3c4E5020Ec3D81E392658eFe7b27966872CE7`.

Leading x402 payment processor with **10.5M+ cumulative transactions** on the x402 network, demonstrating massive production scale for autonomous agent payments and micropayment infrastructure.

Pay-per-call blockchain RPC for agents: one $0.10 USDC settlement on Base buys a 1,000-call Polygon JSON-RPC bundle — no signup, no subscription. HTTP 402-native with spec-compliant payment requirements past the free tier (500 calls/day/IP); wallet-signature registration for prepaid credits at $0.00003/call. Machine-readable manifest, live pricing, market comparison and capability APIs. ([Manifest](https://rpc.satelink.network/.well-known/satelink.json) | [Pricing](https://rpc.satelink.network/v1/pricing) | [Compare](https://rpc.satelink.network/v1/compare))

23-endpoint AI research API for consultants: SEC filings, earnings calls, competitor analysis, market research, and document intelligence. - [Cloudflare Workers](https://workers.cloudflare.com) - Edge computing platform with x402 integration serving global distributed payment verification at scale across 300+ data centers..01 USDC per call on Base mainnet. Wallet: x2b6c16fb557291b98222a570526ff2430848b723. ([OpenAPI](https://gig-x402-api.jayson-be1.workers.dev/openapi.json) | [.well-known/x402.json](https://gig-x402-api.jayson-be1.workers.dev/.well-known/x402.json))

Edge computing platform with x402 integration serving global distributed payment verification at scale across 300+ data centers.

Production FastAPI + LangGraph financial analysis service with x402 paywall on Base. Provides SEC 10-K extraction, stock due diligence, and Kelly Criterion at $0.01-$0.05 USDC per request. ([Discovery](https://veles-finance-gateway.fly.dev/.well-known/x402))

MCP server for DeFi yield discovery & execution across 80+ networks (staking, lending, vaults, RWAs); 2,988+ opportunities. Free discovery tier; paid tools (wallet balances, unsigned enter/exit/manage tx building) at $0.001 USDC per call on Base. No signup — agents pay via x402. ([Discovery](https://mcp.yield.xyz/.well-known/x402))

Official CDP implementation processing hundreds of thousands of transactions weekly with enterprise-grade reliability and 2-second settlement times.