Awesome X402 Awesome

⚑ The Ultimate x402 Resource Hub - Everythng you need to build internet-native payments using HTTP 402. Perfect for AI agents, APIs, and micropayments. Build paywalls, monetize services, and enable autonomous agent payments with crypto/USDC. Zero fees, 2-second settlement.

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Contents

The x402 protocol enables instant Blockchain payments over HTTP using the 402 "Payment Required" status code. This is your complete guide to mastering x402 and building the future of agent payments.

πŸš€ Start building in 5 minutes | ⚑ 2-second settlement | πŸ’° USDC on Base

🎯 Quick Start - Become an x402 Champion

New to x402? Follow this path to mastery:

  1. 5-Minute Quickstart - Accept your first payment.
  2. Choose Your Stack - Find your language/framework.
  3. Copy an Example - Working code you can run immediately.
  4. Join the Community - Get help from other builders.

For AI Agents: Start with MCP Integration to enable Claude/other agents to make autonomous payments.

πŸ“š Official Resources

Core resources from the x402 protocol maintainers.

πŸ“– Protocol Documentation

Essential documentation for understanding and implementing x402.

πŸš€ Quickstart Guides

Get started with x402 in minutes.

βš™οΈ Protocol Implementations

Official and community implementations of the x402 protocol.

Go

  • coinbase/x402 ⭐ Official - Complete Go implementation.
    • Core protocol types and utilities
    • Payment verification and settlement logic
    • Multi-chain support (Base, Base Sepolia, Ethereum, Solana)

TypeScript/JavaScript

  • x402-typescript ⭐ Official - Complete TypeScript implementation.

    • Core protocol types and utilities
    • Payment verification and settlement logic
    • Multi-chain support (Base, Base Sepolia, Ethereum, Solana)

  • x402-data-api - HTTP 402 micro-payment data API with Base chain USDC payments. 16 developer data tools including email validation, DNS lookup, WHOIS, SSL check, and IP geolocation with x402 payment integration.

  • x402-express - Express.js middleware example.

  • hive-rosetta ⭐ Community - Open EIP-3009 transferWithAuthorization signer. Zero ethers/web3 dependency, primitives-only EIP-712. Returns wire shape {scheme: 'exact', network: 'eip155:8453', payload: {authorization, signature}}. Same package name on PyPI. (GitHub)

Python

  • x402 ⭐ Official - Python SDK on PyPI.

    • FastAPI middleware integration
    • Requests session with auto-payments
    • Payment requirement generation

  • ag402 ⭐ Community - 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, 648+ tests. Glama

  • x402-pay - Call any x402 API with one API key. Routes requests through a broker that handles on-chain payment. httpx-based, optional wallet mode for direct payments. (GitHub)

  • hive-rosetta ⭐ Community - Direct port of the Node hive-rosetta signer. Byte-identical EIP-712 digest across both languages. Returns {scheme, network, payload} matching CDP /verify and /settle. (GitHub)

Rust

  • x402-rs ⭐ Community - Production-grade Rust implementation.
    • Axum middleware
    • Reqwest client wrapper
    • Self-hostable facilitator
    • Multi-chain support
  • x402-axum - Axum web framework integration.
  • x402-reqwest - Reqwest HTTP client wrapper.

🏭 Production Implementations

Real companies using x402 in production with proven scale and transaction volumes.

  • Langston Search - Autonomous AI agent's pay-per-query web search API (Brave, falls back to SerpAPI), live on Solana mainnet. 0.02 USDC per query via x402 exact scheme. (Discovery)

High-Volume Production Deployments

  • Kaisha β€” Japan Company Registry API - Official-registry data for all 5.76M Japanese corporations + 5.05M invoice registrations from National Tax Agency open data: resolve company names / corporate numbers (法人η•ͺ号) to registry records, verify Japan invoice registration numbers (適格請求書/T+13-digit) against the NTA dataset, and compute Japanese business days & national holidays. $0.002–$0.01 USDC per call on Base & Solana via CDP facilitator. No API keys. MCP: npx -y kaisha-mcp. (OpenAPI | llms.txt | Discovery | x402scan | npm | GitHub)

  • J-sey Data API - 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.

  • Fleet x402 Microservices - Two agent-payable AI services on Base: SEO Audit ($0.05 USDC) and Competitive Intel Pack ($0.50 USDC). Instant response, zero auth required, machine-readable JSON. (Discovery)

  • Arch Tools - 58 production API tools for AI agents with x402 payments built in. Web scraping, AI generation, crypto data, OCR, browser automation, MCP compatible. Patent-pending agent auth. 15+ chains supported. (GitHub)

  • Bounty API - 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)

  • PayAPI Market - 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)

  • LogicNodes - Live A2A marketplace with 619 deterministic microservices payable per-call in USDC. No signup β€” 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 Β· Basic $0.05 Β· Standard $0.15 Β· Premium $0.50 USDC. MCP: npx @logicnodez/mcp-bridge | Python: pip install logicnodes-m2m. (npm) | (PyPI) | (Agent Guide) | (llms.txt)

  • JarvisClaw - x402 payment gateway bridging 200+ LLM providers (OpenAI, Anthropic, Google, DeepSeek, etc.) to on-chain USDC micropayments on Base. HD wallet per-user isolation, real-time exchange-rate pricing, three-tier caching marketplace, circuit breaker fault tolerance, and multi-chain fallback. Pay-per-token with sub-cent granularity β€” no API keys, no subscriptions. MCP-native with intent resolution for autonomous agents. (Docs) | (SDK: Python) | (SDK: Go)

  • Superhighway - Web search API for AI agents, live in production on Base mainnet. Five tools: search, news, images, scrape, and one-call deep research. $0.001 USDC per call. MCP-compatible: npx -y superhighway-mcp. Free API key available.

  • Rug Munch Intelligence - 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 | OpenAPI | MCP Catalog | Solana | GitHub)

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

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

  • AI Rook β€” Trading Intelligence + General Agent APIs β€” 22 endpoints across 4 categories: trading intelligence (market pulse, trade signals, order flow, liquidation heatmap, AI chart analysis, backtests, smart money), web utilities (web-fetch, search, screenshot, IP lookup, email validate, QR, PDF extract, domain lookup), AI inference (summarize, extract-data, classify via Queen MiniMax M2.7 456B MoE), image generation (FLUX.2-klein). Pay-per-call $0.002–$2.00 USDC on Base via x402-atm v3.0. No API keys. No signup. EscrowV2 onchain settlement. (OpenAPI | x402 manifest | MCP tools)

  • Stratalize β€” 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)

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

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

  • GigSoul AI Research Agent - 23-endpoint AI research API for consultants: SEC filings, earnings calls, competitor analysis, market research, and document intelligence. - Cloudflare Workers - 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 | .well-known/x402.json)

  • Zuluworks AI β€” Sovereign Shaka PQC-Shield Factory - Autonomous A2A factory on Cloudflare Workers selling 5 post-quantum-hardened agent services via x402 USDC on Base L2: quantum-shield ($0.10, ML-KEM-768 PQC tunnel β€” NIST FIPS 203), kya ($0.01, agent trust scoring), browser-rendering ($0.03, headless browser extraction), memory ($0.05, semantic recall on a PQC knowledge index), workers-ai ($0.02, Llama 3.1 inference). All settlement routed through Coinbase CDP facilitator for Bazaar indexing. (Agent Card | Bazaar Manifest | MCP | Sitemap)

  • Suede Agent Studio - Visual agent-flow builder that publishes flows as pay-per-call x402 endpoints (USDC on Base). Machine-readable catalog at /api/catalog; each agent exposes /.well-known/x402, /.well-known/agent-card, and /a2a. Two live agents: Daily Lyric Drop ($0.10 USDC) and The Ownership Loop ($0.25 USDC).

  • Satelink RPC - Pay-per-call blockchain RPC for agents: one $0.10 USDC settlement on Base buys a 1,000-call Polygon JSON-RPC bundle β€” 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 | Pricing | Compare)

  • Agent402 - Open-source, self-hostable x402 + MCP server with ~1,100 deterministic web tools: browser rendering, web search, PDF/image/OCR/audio, geo, live data (FX, weather, USGS, gov-data), network truth (DNS/TLS/WHOIS), crypto/x402 helpers, ~1,040 pure-CPU utilities. Dual-rail: free via proof-of-work, paid via USDC on Base/Polygon/Arbitrum (x402 v2 with Bazaar discovery). No LLM in the serving path β€” every tool re-tested against its own example before each release. Ships a hosted MCP connector (/mcp), an open x402 index (Find Β· Route Β· Leaderboard β€” the first public on-chain ranking of x402 sellers by settled USDC volume), and the agent402-tollbooth pay-per-crawl gate for the publisher side. MIT. (MCP) (OpenAPI) (Discovery) (GitHub)

  • Asset Forge - 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 | GitHub)

  • Tollbooth - 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 | x402 | OpenAPI)

  • GoldBean API β€” 146+ AI endpoints including Baidu OCR, Translation, TTS, LLM Chat with x402 micropayments on Base. From ### Production Success Metrics.01/call for premium AI. MCP server at mcpize.com/mcp/goldbean. (GitHub)

  • ToolSnap MCP β€” 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 β†’ 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 β†’ $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 | Glama)

  • Veles Finance Agent - 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)

  • Lazaretto - 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 | Discovery | Agent Card | MCP)

Production Success Metrics

Key Performance Indicators:

  • 10.5M+ transactions - AIsa cumulative network volume
  • 500K+ weekly transactions - Ecosystem-wide payment activity
  • $180M+ market cap - Combined ecosystem valuation
  • 2-second settlement - Average production payment finality
  • 10,000%+ growth - Year-over-year transaction volume increase

Multi-Chain Production Support

Chain Status Facilitators Settlement Production Examples
Base Production Coinbase CDP, Cloudflare Instant (2s) AIsa, Bitget, thirdweb
Base Sepolia Testnet Coinbase CDP Instant (2s) Development, Testing
Ethereum Production Cloudflare Deferred Enterprise DApps
Solana Production Community Instant (<1s) High-frequency trading
BNB Chain Production Pieverse Instant (2s) Gaming, NFTs
Radius Production Community Instant (<1s) Micropayments

Data & Social APIs

  • botsmith - Pay-per-call web and on-chain intelligence for AI agents, no API keys. read (any URL to clean, boilerplate-free markdown, $0.003), dossier (full domain intelligence in one call: DNS, SPF/DMARC, RDAP registration, live TLS cert, $0.004), and onchain (EVM address due-diligence: contract-or-wallet, scam and reputation flags, balances, verification, deployer, on Base/Ethereum/Optimism, $0.004). USDC on Base via the Coinbase CDP facilitator, x402 v2 with Bazaar discovery. (Discovery | Catalog | MCP)

  • TerraDeed Scrape API - Pay-per-use web scraping and structured JSON extraction. $0.01/$0.05 USDC on Base mainnet. LLM-ready markdown, JS rendering, schema-driven extraction. (GitHub)

  • EZ-Path β€” Best-execution pay-per-request DEX meta-router. Races 10+ venues (0x, ParaSwap, Aerodrome, Uniswap V3, Curve, Balancer, 1Inch, CoW Swap, Synthetix) concurrently on Base mainnet. Three tiers: basic ($0.03, 0x only), resilient ($0.10, dual-lane race), institutional ($0.50, all venues). Strict agent wallet drain protections with hardcoded toll address validation. x402 v2 USDC on Base. Supports ElizaOS plugin integration. (Discovery) (npm) (GitHub)

  • Sentinel Intelligence API - Pay-per-brief fintech and AI governance intelligence. BNPL/embedded finance and AI compliance research briefs at $2 USDC; on-demand research on any topic at $10 USDC. CDP-facilitated settlement on Base mainnet. (Discovery) (GitHub)

  • CrowdPull public-data API - Capped public-data jobs for AI agents: marketplace leads, rental comps, product reviews, hiring signals, and row enrichment. USDC on Base via x402 with no separate account or API key. (OpenAPI | Discovery | Directory | MCP)

  • Groundcheck - Claim grounding and delivery attestation for AI agents: machine-verified verdicts (supported/refuted/unverified) with confidence scores and cited sources, grounded against live web sources. Signed offline-verifiable receipts bind an x402 payment to what was actually delivered. Free single-claim tier; paid endpoints $0.005-$0.05 USDC on Base via the Coinbase CDP facilitator, x402 v1+v2 with Bazaar discovery on every 402. No API keys, no signup. (Discovery) (OpenAPI) (MCP on npm) (GitHub)

  • OSF β€” Open Source Filings - Provenance-stamped public-domain US government and scientific data for AI agents. SEC EDGAR, FRED, NOAA, openFDA, USGS, Crossref, and more β€” every record ships with a provenance URL back to its authoritative primary source. Pay-per-record x402 USDC on Base, $0.05–$0.50. Paid MCP server + listed in the official MCP Registry. No API keys, no subscriptions. (MCP | MCP Registry | Bazaar health)

  • Touchstone - A deterministic-truth suite for AI agents: 14 pay-per-call endpoints whose answers reproduce a named public authority byte-for-byte, so an agent can re-run and verify an answer instead of trusting the seller. Physical truth β€” /sky (Sun/Moon/planet alt-az, rise/set/transit, twilight, phase; JPL DE421, ~1 arcsec) and /field (magnetic declination/inclination/intensity + secular variation; NOAA WMM2025, 100/100 on NOAA's published test values). Time β€” /time (IANA tzdata) and /prosody (CMUdict syllables/stress/meter). Trust primitives β€” /timestamp, /sealed (timelock encrypt-to-the-future), /random/proof (drand-backed provably-fair draws), /verify/sig (ecrecover, EIP-191/712). Text & code workbench β€” /unit (NIST SP 811 factors), /readability, /syntax, /proofread, /cite (APA/MLA/Chicago/BibTeX), /diff. Every answer is signed; same input β†’ same bytes. USDC on Base via Coinbase CDP facilitator; x402 v2 with Bazaar discovery on every 402. No API keys, no signup; free schemas + samples at / and each /<route>/example. Prices $0.001–$0.003. (free library on PyPI) (GitHub)

  • AI Growth - Real-data feeds for AI agents, settling via Coinbase CDP Facilitator on Base mainnet. Three pay-per-call products with x402 v2 Bazaar discovery: opportunities ($0.01, Claude-scored AI revenue opportunities from real GitHub bounties), verification ($0.02, timestamped proof-of-execution receipts β€” HTTP status, latency, phantom/simulation detection so agents can confirm an A2A service is real before paying), and benchmarks ($0.02, real endpoint liveness & latency measurements for routing). All data sourced from verified live calls β€” no synthetic data. No API keys, no signup. Select product via ?product=<id>. (Discovery)

  • MiroShark - Universal swarm-intelligence engine exposed as a paid API: POST a scenario to the /x402/run surface and hundreds of grounded LLM personas simulate Twitter, Reddit, and a prediction market hour-by-hour, returning an analytical report. USDC on Base via x402. (GitHub)

  • wrapper-agency APIs - Suite of 8 pay-per-call utility APIs settled in USDC on Base via x402 (free tier + one key for all): historical FX rates, color conversion, timezone/DST, fake/mock data, cron explainer, QR codes, data-format conversion, and encode/hash. (FX) (Color) (Timezone) (Mock data) (Cron) (QR) (Data format) (Encode)

  • Crest x402 Data - x402 agent profiling plus crypto market data. Profile any x402 buyer or EVM wallet (whale score, behavior cluster, x402 spend graph, risk), plus prices, gas, DeFi, derivatives, NFTs, and DEX pairs. $0.002-$0.90 USDC on Base via Coinbase CDP facilitator, no API keys. (Agent Card | llms.txt | l402-services)

  • Pyrimid - Agent commerce protocol for x402-style USDC payments on Base. Includes on-chain vendor/product registry, payment router, affiliate attribution, MCP endpoint, and live catalog API for agent-discoverable paid services. Current mainnet proof: 3 vendors, 8 on-chain products, 4 routed test payments. (Catalog) (MCP) (Skill)

  • Polybot Arb Intelligence β€” Real-time cross-platform prediction market arb data (Polymarket+Kalshi+Myriad). x402 USDC on Base. Live API

  • Bismuth - Utility API suite for AI agents on x402. 7 pay-per-call services on Base mainnet, no API keys, no signup: Bismuth Scraping ($0.02 scrape / $0.10 BFS crawl β€” Playwright, SSRF-protected), Bismuth Screenshot ($0.01, Playwright PNG/JPEG), Bismuth PDF Extraction ($0.01, OCR + vision mode), Bismuth Email ($0.01, Resend + CC/BCC/attachments), Bismuth Search ($0.01, Tavily-ranked), Bismuth Conversion ($0.02 β€” image reformat, CSVβ†’JSON, HTMLβ†’PDF, DOCXβ†’PDF), Bismuth Crypto Intelligence ($0.01–$0.10, CoinGecko/DeFiLlama/CoinTelegraph/GitHub across 17 major coins). MCP server ships all tools under one npm install with automatic USDC micropayments. (MCP Server | Scraping Discovery | Screenshot Discovery | PDF Discovery | Email Discovery | Search Discovery | Conversion Discovery | Crypto Discovery)

  • Aigregator - Structured data on 5,336+ AI tools via REST API and MCP server. Search, compare, and retrieve tool profiles. USDC micropayments on Base. (MCP Server)

  • Xquik - Real-time X (Twitter) data API with 7 MPP/x402 pay-per-use endpoints β€” tweet lookup, tweet search, user lookup, follower check, article extraction, media download, and trends. No accounts or subscriptions required. (GitHub) (npm) (MCP Server)

  • AgentBodega - Agent-ready paid API shelf with 51 x402-payable public-data, social-media, cloud/status, domain, artifact, launch-readiness, and x402-inspection endpoints. USDC on Base, no API keys or signup, full input/output contracts, examples, pricing, and payment metadata. (Catalog | OpenAPI | Discovery | MCP | GitHub)

  • glim.sh - Live data from Twitter, Reddit, the web, GitHub, Amazon, and YouTube for AI agents. 11 MCP tools, $0.002-$0.015 USDC per call (Base/Solana/Monad). No API keys, no scraping stack. (MCP Server) (OpenAPI) (GitHub)

  • agentsvc.io - 20 utility tools for AI agents via x402 USDC micropayments on Base. Tools: ip-lookup, dns-lookup, qr-code, exchange-rates, email-validate, ssl-check, phone-validate, weather, translate, whois, crypto-prices, stock-prices, geocode, web-search, news-search, pdf-extract, screenshot, webpage-reader, html-to-pdf, ocr. $0.001–$0.008 USDC per call. No API keys, no signup. Auto-discovery: /.well-known/agent-services.json | Catalog | OpenAPI | MCP Server | (GitHub)

  • x402 Vending Machine - Base mainnet USDC bundler hub for AI agents (x402 V2 + Coinbase CDP): ~19 pay-per-call tools including multi-step packs (bundle-infra, bundle-outbound, domain-intel), DNS/TLS/WHOIS/HTTP utilities, email MX, FX, IP geo, CoinGecko spots, QR, page text extract, Base balances, and Kronos BTC/ETH candle research forecasts. Live data only; fail-closed (no settle on handler errors). CDP Bazaar indexed. (Discovery) (Agent catalog) (OpenAPI) (llms.txt) (GitHub)

  • AgentData API - Real-time crypto market data for AI agents. 16 pay-per-request endpoints on Base Mainnet: prices, funding rates, volatility, liquidation levels, DeFi yields, cross-exchange arbitrage, technical indicators (RSI/MACD/BB/ATR), support/resistance, sentiment, stablecoin health, and historical OHLCV. Self-hosted facilitator, no accounts required. Supports x402 v2 with Bazaar discovery extension. (Discovery) (OpenAPI)

  • Stakao Agent Allocation Analysis - Informational Bittensor allocation analysis API for AI agents, paid with x402 v2 USDC on Base. Supports walletless model portfolio snapshots, wallet-specific preflight flows, OpenAPI, read-only MCP, and llms.txt discovery. (OpenAPI | Docs | llms.txt)

  • GPT55 x402 Wallet Safety and Merchant Readiness - x402-paid agent gateway for AI buyers that need wallet signing safety, EIP-712/Permit2 risk decoding, EVM transaction risk decoding, approval-risk auditing, x402 prepay trust checks, merchant-readiness reports, and GPT55 chat on Base USDC. Prices start at $0.0001 for chat, $0.004 for prepay checks, and $0.01 for signing/approval checks. (Discovery) (OpenAPI) (Wallet Safety Kit) (MCP Config)

  • Fly Labs Agentic Market - YouTube data APIs for AI agents, paid in USDC on Base. Two endpoints live: POST /api/agents/transcribe ($0.03) returns a stable v1.0 JSON payload with verbatim transcript, language, time-indexed paragraphs, creator chapters, and canonical metadata (captions when available, Whisper fallback otherwise, no LLM rewrites). POST /api/agents/engagement ($0.02) returns view/like/comment counts, derived ratios, a composite engagement score, channel info (subscribers included), and full video context (tags, categories, thumbnail, availability, live status). Transparent cache on every response (cache.hit, cachedAt, ageSec) β€” transcripts are permanent, engagement refreshes every 6 hours. Typed error codes, OpenAPI 3.1, no signup. (OpenAPI 3.1) (Manifest)

  • NicheData KDP Intelligence - Niche demand and competition intelligence for Kindle Direct Publishing authors. AI agents query keyword-level data including demand scores, competition intensity, BSR ranges, revenue estimates, and pricing analytics. $0.03 USDC per query on Base via CDP Facilitator. Free discovery endpoint lists all available niches. (OpenAPI) (Docs)

  • AIServices - 16-endpoint crypto and market intelligence API for AI agents. 11 free endpoints (prices, trending, global market cap, gas tracker, predictions, news, social sentiment, swap quotes) plus 4 paid endpoints via x402: search ($0.01), technical indicators ($0.02), DeFi yields ($0.02), and URL metadata ($0.01). USDC on Base via Coinbase CDP facilitator. Remote MCP server at /mcp (8 tools, SSE transport). No API keys for free endpoints, no signup. (Discovery) (MCP) (GitHub)

  • Intelica - Competitive intelligence API for autonomous AI agents. Analyzes any URL or company description and returns structured JSON with market positioning, competitors, pain points, and executable Market S