Awesome Projects

• Gurus Hubmart - Autonomous-agent marketplace on XRPL Mainnet. Four x402-paid agent services discoverable via agent-services.json, x402.json, agent-card.json, agent.json, OpenAPI, and MCP. Prices start at 1,000 XRP drops per call. OpenAPI | Discovery | MCP | llms.txt

x402 Enabled APIs & Services

Platforms that implement or enable payments, monetization, or x402 integration.

• BlorpAg - Bounded text utilities for AI agents: summarize and transform text at $0.01 per request in USDC on Base via x402 v2, no account and no API key; price, input schema, output schema and a worked example are published per endpoint before you pay. Discovery | OpenAPI | llms.txt | How to buy

• Genesis402 by UnyKorn - 370 pay-per-call endpoints for AI agents over x402 v2 and MPP, no account or API key: pre-payment wallet/contract address checks ($0.01, pass/review/block against the OFAC SDN, EU and UK sanctions address lists, a community scam-address list and an on-chain read), sanctions name screens and counterparty reports, on-chain reads and data utilities ($0.003-$25 per call). USDC on Base, Polygon or Solana. Every paid call returns an Ed25519-signed receipt, and the public receipt ledger labels external vs internal payers. Discovery | OpenAPI | MCP | Receipts | llms.txt | GitHub

• Blockchain Fraud address screen - POST https://blockchainfraud.org/api/x402/screen with {"address": "..."}: screens one EVM, Bitcoin, Tron, XRPL or Solana address against the OFAC SDN list and the Blockchain Fraud scam-address registry, with format checks, and returns a SANCTIONED / REGISTRY_MATCH / NO_MATCH verdict as JSON. $0.25 USDC on Base via x402 v2 (exact), no account; a malformed address is refused before payment. From the crypto fraud investigation service run by UnyKorn LLC (free web scam check on the homepage). Manifest | Methodology | llms.txt

• ADEXTO - Buy bonding-curve token markets on Monad, Arbitrum One, Base, Robinhood Chain and 0G with USDC on Base, no bridge and no destination gas. 0.10 USDC per fill via x402 v2 (exact, EIP-3009); the curve on the market's own chain delivers to the payer before the payment settles. Remote MCP server with 14 tools at https://adexto.xyz/api/mcp. OpenAPI | GitHub

• Ni Biashara Shelves - Pay-per-call APIs for African FX rates, US freight authority checks and OFAC sanctions screening, with x402 USDC payments on Base, a TypeScript client and hosted MCP access.

• Agent Research Tools - Cited research briefs ($0.01), web page to markdown ($0.005) and x402 endpoint checks ($0.005) for AI agents. USDC on Base via x402 (CDP facilitator), no API key; errors are never charged. OpenAPI | Discovery | llms.txt

• Astro Agents - Deterministic Western and Vedic astrology for AI agents: natal charts, transits, synastry, kundli, Vimshottari dashas, panchang and Gun Milan from NASA/JPL DE440, no LLM, every result carries a verifiable SHA-256 hash. $0.01-$0.50 per call in USDC on Base or Solana (CDP facilitator), also payable via MPP (Tempo); first 3 calls free; errors are never charged. OpenAPI | Discovery | llms.txt | MCP

• Bounty Aggregator API - Aggregated open bounty listings for AI agents: title, USDC reward, required skills, deadline, source URL. $0.02 USDC/call on Base via x402. Free demo

• Contract Risk Scanner - Smart-contract risk scanner: submit a contract address or bytecode, receive a risk score with findings. $0.02 USDC/call on Base via x402.

• 402 load network - The x402 toolkit for ANS-104 dataitems

• 402Signal - Checks live x402 routes across Base, Solana, and Algorand before agents spend. $0.003 USDC settles only for a valid live eligible route; normal typed misses are not settled. Seller payment is separate and the agent keeps its wallet. The PQ Trust log targets Algorand MainNet.

• Royal Agentic Enterprises — RAE x402 Fleet - 9 production x402 v2 services on Base mainnet (14 paid routes: consumer-debt dispute packs, project/agent scaffolding, outreach email scoring, image generation & editing, US consumer-rights law lookup, skill discovery, market signals, and natural-language service routing). $0.01–$5.00 USDC per call; no API keys, no signup. Each service publishes /.well-known/x402.json and an OpenAPI 3 spec. Discovery | OpenAPI

• agdata - Unblocker, screenshot and web data API for agents: fetch any URL as Markdown (including Cloudflare-protected and JavaScript-rendered pages), screenshot it as an image or PDF, or get YouTube transcripts, Google Maps reviews and Instagram, TikTok, Reddit, X, LinkedIn, Amazon and Google Search data as JSON. Paid per call in USDC over x402 on Base, Polygon or Solana, or MPP on Base, with no API key; a call that fails is not charged. OpenAPI | Discovery

• agent-tools.net - Pay-per-call API marketplace for AI agents (page extraction, structured scraping, URL/status checks, robots.txt checks), $0.001-$0.01 USDC per call on Base. Third parties can list their own tool in the directory via a flat x402 listing fee — no accounts needed on either side. Directory | Agent Card | GitHub

• Agent402 - 1,100+ pay-per-call web tools for AI agents: headless browser, live web search, PDF extract/merge/split, image and audio conversion, durable wallet-keyed memory, and ~970 deterministic unit and encoding utilities. USDC on Base (also Polygon, Arbitrum), or free via proof-of-work. Hosted MCP connector + non-custodial buyer SDK. Open-source and self-hostable. GitHub | MCP | OpenAPI | Discovery | Leaderboard

• AgentBodega - Agent-ready paid API catalog with 65 x402-payable JSON resources for search, web fetch, public data, social media, status checks, media conversion, and agent-readiness audits. Base USDC settlement, no API keys. OpenAPI | Discovery | MCP

• AgentIAM (Achilles EP) - Agent identity and safety layer with 18 x402 endpoints on Base Mainnet. Safety pillars: NoLeak (execution integrity), MemGuard (state verification), RiskOracle (risk scoring), SecureExec (sandboxed exec), FlowCore (orchestration). Plus code audit, validate, research, DELPHI intelligence + knowledge graph (entity/query/timeline/contradictions), real-time signals (latest/query/publish). $0.001–$0.05 USDC/call. x402scan | MCP Server | Docs

• AgentServices - Paid data APIs for AI agents with x402 USDC micropayments on Base. 54 services, 97 paths, 41 x402-paid endpoints, 37 MCP tools. Market data, financial intelligence, onchain analytics, and inference APIs. OpenAPI | Discovery | MCP

• AgentShop - Seven deterministic x402 pay-per-call tools for AI agents on Bankr Cloud: URL→Markdown, DEX token snapshots, URL metadata, weather, fiat FX, Wikipedia lookup, Hacker News search. USDC on Base, GET+POST, no API keys. Live | Discovery | OpenAPI | MCP

• agmail - Email inboxes for AI agents, by the hour: an address of your choice (name@agmail.shveik.dev), and one call waits for a message and returns the code or link. Paid per call in stablecoins over x402, with no account. OpenAPI | Discovery

• agpay - Payments held between two agents: the buyer pays by x402 or MPP, the seller proves its wallet and delivers, the buyer confirms and the seller is paid; a dispute is decided by hand. Paid in stablecoins on Base, with no account. OpenAPI | Discovery

• agproxy - Residential proxies for AI agents: buy gigabytes of residential proxy traffic and get a proxy login, or fetch one URL from a residential IP and get the raw response. Paid per call in stablecoins over x402 on Base or Polygon, or MPP on Base, with no account or API key; a fetch that fails is not charged. OpenAPI | Discovery

• agvps - Servers for AI agents, rented by the month: a Linux server (Ubuntu 24.04) with root access and a public IPv4, in Germany or Finland. Paid per call in stablecoins over x402 on Base, Polygon or Solana, or MPP on Base, with no account or card; pay again to renew, and a call that cannot be served is not charged. OpenAPI | Discovery

• APEX - Pay-per-call data and web tools for AI agents over x402 on Arc, Base, Solana and X1, with Circle Gateway nanopayments on Arc and Base: a real headless-Chrome page reader ($0.009), Arc token exit checks, ERC-8004 agent passports ($0.99) and more, from $0.003 a call. MCP server at https://apexfaucet.xyz/api/mcp.

• NanoTools - 44 pay-per-call x402 tools for AI agents on Base mainnet: Google Trends (timeline, related queries, regions), Google AND Yandex SERP, SEO audits (meta, robots.txt), page screenshots and PDF via real headless Chromium, OG-image generation, weather, FX rates, whois, RSS, QR, JWT, cron parsing and 25+ utilities. $0.001-$0.03 USDC per call, no signup. Discovery | OpenAPI | llms.txt | A2A | Health

• Anicca - Autonomous Buddhist AI agent. Self-operating LLM that funds its own compute by selling 5 priced routes: /qa ($0.003 Buddhist Q&A), /research ($0.05 deep research w/ citations), /x-post ($0.01 tweet draft), /pdf/:slug ($5–29 premium PDFs), /build ($50–2000 custom autonomous builds). USDC on Base. MIT-licensed, no human in the loop. Discovery | GitHub | Autonomy spec

• API Factory x402 - 100 production-ready x402 APIs for AI agents across crypto, B2B, SEO, security. npm SDK: x402-agent-tools (103 tools).

• BridgeNode - OpenAI-compatible AI chat completions (DeepSeek V4 Flash) with x402 micropayments on Solana: pay per request in USDC, no API keys, no signup. From $0.002/request. OpenAPI | Discovery | MCP | llms.txt

• bilbop - Pay-per-call Solana tools for AI agents: on-chain mint info, token briefs and text summaries ($0.01), Piper TTS WAV ($0.025), and human brand feedback ($0.50). x402 v2 exact, USDC on Solana, no API keys or signup. OpenAPI | Discovery

• Bug Bounty Intelligence - Smart contract security scanner for AI agents, trained on 27,681 real accepted findings from Sherlock and Code4rena audit competitions. 5 USDC per scan on Base.

• Clear - Pay $0.005 USDC on Base for one public URL as markdown. Fail is free. No local browser. OpenAPI | Discovery | Skill | llms.txt

• Colombia TRM - Official Superintendencia Financiera daily USD/COP (datos.gov.co mcec-87by), $0.005 USDC on Base. Discovery | OpenAPI | GitHub

• csv-to-xlsx-x402 - Converts CSV to XLSX for AI agents via a single POST call. $0.02 USDC per call on Base or Solana, no API keys, no signup. OpenAPI | Discovery

• Council of AI (GSPC) - Signed, re-checkable AI behaviour measurement cards over MCP and x402; x402-metered evidence endpoints settle in USDC on Base, while reading the board and client-side verification stay free. Discovery | Quickstart

• Ausca - Metered agent infrastructure: document OCR, document analysis, media transcription, browser sessions, and agent inboxes paid per call with x402 USDC on Base; no accounts or API keys, receipt-backed results. OpenAPI | Discovery | MCP

• DeFi Signal API - Live Morpho/Aave liquidation and lending intelligence from production bot infrastructure continuously scanning 2,586 Morpho Blue borrowers and 19,000+ Aave V3 positions on Base and Arbitrum. $0.002-$0.010 USDC per call.

• Deploid Enrich - Work-email enrichment for AI agents via x402 v2 on Base. Limited public pilot; 0.15 USDC per FullEnrich DELIVERABLE work email, asynchronous jobs and free polling. No match, no charge. OpenAPI | Integration

• Einstein AI - AI blockchain intelligence - whale tracking, smart money, launchpad monitoring

• Frantic - Bounty board where AI agents claim funded work, deliver artifacts, and are paid USDC on Base only on accepted delivery

• Gatepay - Monetize any digital content with crypto payments

• GenTech Labs - Agentic treasury + x402 payment infrastructure: 10 pay-per-call services (treasury defense, DeFi LP analytics, token security, wallet analysis, market intelligence, agent discovery, NFT search, research) at $0.001-$0.10 USDC per call across Base, Avalanche, Algorand, X Layer and Solana. Cross-chain settlement, machine discovery manifest. Discovery | OpenAPI | Agent Card

• GPT-5.6 Luna x402 API Gateway - OpenAI-compatible GPT-5.6 Luna Standard chat result for $0.00293 USDC per request on Base, with browser-wallet checkout and quote-first agent fallback; current routes and prepaid packs are in the unified service hub. OpenAPI | Discovery | Service JSON | Source

• Horizon Pulse - Pay-per-call APIs for AI agents over x402 v2, USDC on Base mainnet via the Coinbase CDP facilitator. 13 routes: web search to markdown ($0.03), web fetch to clean text/markdown ($0.02), PDF to text ($0.02), screenshot ($0.02), SSRF-safe HTTP proxy ($0.01, GET/POST), URL/HTML structured extract ($0.015, GET/POST), x402 endpoint audit ($0.01); crypto pulse ($0.005), signals ($0.015), DeFi yield ($0.02), wallet portfolio ($0.04), gas ($0.01), funding ($0.01). No API keys; free hosted MCP endpoint for discovery. OpenAPI | Discovery | llms.txt | Agent guide | Status

• httpayer - Automated x402 payments for Web2, Web3 and AI Agents

• InsumerAPI - Signed on-chain condition checks for AI agents: token balances, NFT ownership, EAS attestations, and agent standing (ERC-8004, ERC-7710) across 37 chains, pay-per-call over x402 in USDC on Base, Polygon, Arbitrum, Arc or Solana, no API key. OpenAPI | Discovery

• Iron City - A sovereign AI agent economy: oracle-verified tools (sealed sandbox), a provably-fair drone-training arena, trustless escrow, and a data broker with sealed-bid auctions. Pay-per-use in USDC on Base. Discovery | MCP

• Israel Tariff x402 API - Pay-per-call access to normalized Israeli customs tariff data from the official Israel Tax Authority open dataset. Base mainnet, 0.0025 USDC per successful lookup. Live endpoint

• JMT x402 Agent Tools — 25 paid x402 endpoints on Base mainnet: web search, AI analysis, crypto/stock data, SEC filings, company intel, news, sentiment, macro dashboard. $0.001-$0.15/call USDC. Local LLM-powered.

• Kerne Protocol - Proof-of-reserves and signed ERC-20 reads for AI agents on Base. GET /reserves ($0.25) returns Kerne's hourly EOA-signed proof-of-reserves attestation for its kUSD synthetic dollar; POST /instant-read ($29) returns an EIP-191 signed read of any ERC-20. USDC on Base via the Coinbase CDP facilitator, indexed in the CDP Bazaar. Every response is independently verifiable (EIP-191); the same signed reserves blob is served free to humans at https://kerne.fi/api/por/signed. OpenAPI | Home

• MCPay - Payments for MCPs

• Meridian - x402 payment rails for the agent economy

• MoltGuard - All-in-one trust & integrity API for the x402 agent economy — agent trust scoring, Sybil detection, Polymarket integrity, Ed25519-signed Verifiable Credentials, plus three vertical modules: MT Shopping (BuyerAgentCredentials for agentic commerce), MT Travel (TravelAgentCredentials with delegation chains), and MT Skills (8-point security audits + VerifiedSkillCredentials for AI agent skills). 19 endpoints, x402 micropayments on Base. MCP | Docs

• patternfetch - Market-state briefs for US stocks, ETFs and crypto spot: chart patterns returned with a backtested base rate, sample size and lift against a pattern-free baseline, plus support/resistance, regime and RSI/EMA. Keyless demo endpoint, x402 USDC on Base for credit top-up. Discovery | MCP

• PayPerByte - 12 pay-per-call data feeds and verdict oracles on Base mainnet, including: weather, earthquakes, CCTP v2 attestation latency, security advisories, runtime EOL, malicious-package, sanctions, address-reputation, merchant-screening, reasoning-verdict and perp positioning. $0.003–$0.10 USDC. Every paid 200 carries an EIP-712 PayloadAttestation over the exact bytes served — evidence toward authenticity and tamper-evidence, not data correctness — verifiable offline with @payperbyte/sdk; 9 of the 12 also pin a per-feed signer in the manifest's receipt.embedded.signers map. OpenAPI | Discovery | MCP | Attestation spec

• Power Pack x402 - Outreach email scorer (Claude Haiku 4.5). Scores subject + body quality, predicted open rate, spam risk, tone, length, personalization, CTA clarity. Returns top 3 specific improvements and a rewritten subject. $0.01 USDC per call on Base. Source | RAE Fleet catalog

• Sourcey Startup Credits Review - Human review of one startup-program submission against public evidence and Catalog admission rules for $25 USDC on Base; payment funds the review and does not buy acceptance. OpenAPI | Discovery | MCP

• Settled - Checks x402 endpoints before agents pay them. Settled probes 24,000+ endpoints, makes real USDC test purchases on Base to see whether they deliver, and checks each seller's on-chain settlements and paying agents' reports; every answer is a signed pay / caution / avoid verdict. Free checks (300 a day), preflight $0.005, 24-hour pass $0.05; MCP server at https://settled.tools/mcp.

• SIBYL - Autonomous crypto intelligence agent on Base - token scoring, rug/honeypot detection, builder value analysis via x402 micropayments

• The Stall - Domain-agnostic x402 capability chassis for AI agents: US stock prices ($0.030/call), market intelligence ($0.50), and concentration-risk scoring ($0.10) on Base mainnet via Coinbase CDP. A2A agent card at /.well-known/agent.json. Built by IntuiTek¹.

• tip.md - Get rewarded for your open source work in minutes

• true402 - Machine-native x402 marketplace on Base: token rug check with real buy/sell honeypot simulation, address safety, deployer reputation, new pairs, whale swaps, SEO/GEO audits, and LLM inference. ~13 endpoints, $0.001–$0.015 USDC; MCP server npx @true402.dev/mcp-server. OpenAPI | llms.txt

• Truth Bear (GAUGE) - Verifiable official facts for AI agents. 180+ government signals (FRED, USGS, SEC, NOAA, EPA) with SHA-256 record_hash anchored to Bitcoin via OpenTimestamps. x402 pay-per-call (USDC on Base), free tools included. MCP | Front desk | Discovery

• twitr.sh - Pay-per-call X (Twitter) data for AI agents: reads, search, timelines, lists, communities, 23 bulk extractors, real-time account/keyword monitors (prepaid hours, HMAC-signed webhooks), giveaway draws, trend radar and an AI tweet composer. Volume tools bill per returned item against a mandatory resultsLimit. 14 paid tools + 17 free SIWX endpoints, $0.001-$84 USDC. x402 v2 on Base/Solana plus MPP on Tempo, no API keys. OpenAPI | Discovery | MCP

• TWZRD Agent Intel - Trust scoring and x402 micropayment verification MCP for AI agents on Solana. Verify counterparty wallet reputation before transacting: score_agent, preflight_check, resolve_agent (free) + get_trust_receipt (paid via HTTP 402 + USDC on Solana). Zero-install MCP: https://intel.twzrd.xyz/mcp. PyPI: pip install twzrd-agent-intel.

• Vend - Pay-per-call data APIs for AI agents settled on Nano (XNO): clean text/markdown extraction from any URL, web search, IP geolocation, domain intelligence, Nano account info. 0.0001–0.0005 XNO per call on a fee-free native rail (no gas, no stablecoin on-ramp, no facilitator); passes the Stelar x402 Doctor with grade A / 100.0. x402 v2 manifest. Discovery | OpenAPI

• Unstuck - Agent-to-agent Q&A network settled in Nano (XNO): agents ask what they are stuck on, answer each other, mark what worked, and pay in fee-free instant Nano. x402 v2 nano: settle scheme. Agent on-ramp (one HTTP GET, no account, no API key) at /unstuck/api/v1/onramp/address. Onramp | Network

• x402 AI API — zeroreader - 29 Cloudflare Workers AI models (LLM, Embeddings, Image, Audio, Translation) via x402 micropayments on Base. OpenAI-compatible, streaming, batch. OpenAPI

• x402-api - Unified DeFi data API (CoinGecko, DefiLlama, Hyperliquid, GoPlus, Blockchair) with x402 micropayments on Base. MCP server + ElizaOS plugin available. Github

• xcache.io - Create your own cache, no account required, just pay with x402

• Munchausen Lab Analytics - Pay-per-call market intelligence APIs for AI agents: real-time quotes, LLM analysis and research reports, web extraction, fact-checking, token rug-pull safety scores. x402 USDC on Base, $0.10-$2.50 per call, no API keys. OpenAPI | Discovery

• Textus - Structured literary content for AI agents, including complete selected text units, metadata, characters, scenes and editable baseline reading direction. Discover resources freely and purchase production-material JSON through x402.

• NEX Agent Co. - Live x402 + A2A dual-protocol agentic commerce on Base. 11 paid USDC endpoints at $0.001-0.01 (chat, code, code-pro, vision, embed, crypto-price, weather, geo, fx, whois), 10 free mirrors at /v1/free/* (30/min/IP), A2A JSON-RPC 2.0 endpoint at /a2a/tasks/send, Apache-2.0 reference server, 23 on-chain NFTs for ERC-8004-style reputation. First A2A + x402 dual-protocol agent. A2A | GitHub

• TrollBridge - 15-lane x402 pay-per-call intel feed for AI agents: bounties, prices, yields, web search, token safety, Polymarket odds and more. $0.02–$0.05 USDC/call on Base and Solana, no API keys, no signup. OpenAPI | GitHub

• sigtap Agent Tools - 12 pay-per-call outreach + utility APIs for AI agents: cold-email grader and generator, deliverability (SPF/DKIM/DMARC/MX), hashing, UUID/ULID batch, slug (latin+Cyrillic), regex tester, JWT decode, JSON flatten/CSV, crypto price, domain age, weather. $0.0005-$0.01 USDC per call on Base via x402, no API keys; free truncated preview of every tool at /preview/. Hosted MCP server with the same tools. OpenAPI | llms.txt | llms-full.txt | MCP

• Agent Embassy - Agents pay for work and prove what happened. Paid x402 v2 service (USDC on Base and Arbitrum One): verified_check $0.15, register_recovery $1.00, compute spot/history/alerts $0.25 per call. Discovery | Skill

• Loophole Tape - Pay-per-call pump.fun launch-risk checks (calibrated rug and graduation probabilities), launch feeds from $0.001 per poll, and Robinhood Chain launch-curve data from the seller's own chain capture. x402 v2 in USDC on Solana or Base, over HTTP and MCP; free radar and samples.

• AurasPay Agentic Payments - Merchant commerce APIs and MCP with route-scoped x402 payments on Base USDC and AurasPay-owned, unaudited 99/1 split settlement; existing payment links use a separate custom scheme.

• Vend — extract (pay-per-call API) - Pay-per-call API suite for AI agents (clean web-text extraction, geoip, search and more), settling fee-free in native Nano (XNO) via the x402 v2 exact scheme on nano:mainnet — no signup, no API key, zero network fee, sub-second finality. x402 manifest

• Ambolt - Pay-per-call data tools for AI agents over x402 on Base and Solana, no API key and no LLM: company registry lookup (Norway, Finland, Czechia, Slovakia, France, UK, Latvia, Estonia, Brazil by CNPJ, GLEIF), EU/UK tenders, ECB rates, IBAN/DNS/SSL checks and on-chain token facts. $0.003-$0.02 per call, failed calls are not charged, one free call per tool and IP per day. OpenAPI | free MCP server: https://api.ambolt.dev/mcp

• Steward - Micropayments for AI agents — pay per API call in USDC on Base via x402. Catalog | llms.txt | agent.json

• Voidpay x402 data APIs - Three x402 v2 POST resources on Base mainnet: claim verification (/v1/verify-claim, $0.01 USDC), accessibility comparison (/v1/accessibility/check, $0.01 USDC), and incident evidence report (/data/incidents/report, $0.02 USDC).

• Tanod - 40+ pay-per-call tools for AI agents over x402 v2 (exact, USDC on Base) and a remote MCP server, no account or API key: Solidity contract scans (solc + Slither + custom DeFi detectors, from $0.25), a pre-transaction address risk check ($0.005), OFAC SDN crypto-address screening ($0.002), a scan of MCP server and agent skill packages before install ($0.02-$0.05), plus web page, PDF, DNS/RDAP and chain-read utilities from $0.001. Small free daily tier per IP; results are automated heuristics, not audits. OpenAPI | Discovery | MCP | llms.txt | GitHub

• Penny Press - Essays on freedom, economics and philosophy: free for humans to read, pay-per-read for AI agents via x402 micropayments ($0.01–$0.05 per essay, USDC on Base, no account or API key). Discovery | OpenAPI | llms.txt | MCP

x402 Developer Tools & SDKs

Libraries, SDKs, and dev tools for building with x402.

• @bridgenode/llm - TypeScript SDK for BridgeNode: automatic x402 payments on Solana USDC (gasless, no API keys, pay per request).
• @bridgenode/mcp - MCP server wrapper for BridgeNode: stdio MCP server with automatic x402 payments on Solana USDC (gasless, no API keys, pay per request). One-command install for Claude Code / Cursor.
• a2a x402 TypeScript library
• Agent Commerce Gateway - Self-hosted, non-custodial gateway that sells existing HTTP APIs to AI agents over HTTP, MCP and A2A, with x402 v2 exact (EVM) or MPP payments that go directly to the merchant wallet.
• agenticpay - Open-source TypeScript x402 stack for MCP on Solana: SDK, CLI, paywall middleware, first OSS self-hostable facilitator, Eliza plugin. Hosted devnet endpoint, live Claude Opus demo paying autonomously. MIT. npm: @agenticpay/{sdk,cli,mcp-server,facilitator,eliza-plugin}.
• Arc x402 Explorer - Every x402 payment on Arc (Circle's L1) read from the chain: EIP-3009 settlements and Circle Gateway batches, by facilitator and seller. JSON at https://apexfaucet.xyz/api/arc/x402.
• bridgenode-llm - Python SDK for BridgeNode: automatic x402 payments on Solana USDC (gasless, no API keys, pay per request).
• Burnbound - Spending limits for AI agents that pay x402 APIs: MCP server (@burnbound/mcp) for Claude Code and Cursor with per-agent daily caps, allowed hosts and human approval; bring your own wallet.
• cipher-x402-client - Tiny TypeScript client for x402 v2. Zero-config USDC-on-Base, auto-retry on 402 Payment Required.
• cipher-x402-mcp - MCP server exposing 8 CIPHER x402-gated tools to Claude/Cursor/VS Code. Agents auto-pay USDC per tool call.
• dual-rail - Add an XNO (Nano) payment leg beside an existing USDC/x402 rail, never instead of it: a feeless, instant settlement option for any x402 route. 34 Python + 22 Node tests, both-rails-live check.
• corbits - Ready your apps for Agentic Commerce
• Hilt Pay - Payment-to-access infrastructure for x402 V2 challenge and retry flows on Solana USDC, with settlement verification, receipts, entitlements, atomic usage consumption, webhooks, SDKs, MCP, and A2A discovery.
• mcp-go-x402 - Go SDK for MCP x402
• mogami.tech - SDKs, tools, and services built in Java
• nano-invoice - Bind an XNO (Nano) payment to the order it pays for (Nano has no memo field): one invoice per order, a unique tagged amount settles one invoice, refunds to the real sender. 40 tests, live node read verified.
• nano-finality-proof - Measure how long an XNO (Nano) payment takes to confirm on a node you run, so an agent knows when a payment is final. 54 unit + 67 e2e checks.
• openai-agents-nano - Python client that pays any x402-priced HTTP endpoint in self-custodied Nano (XNO) from an OpenAI Agents SDK agent, via the feeless402 client. Feel-free and instant.
• Sato Hub - Index of x402 tools scored on how open, active and verifiable they are, plus a map of x402 facilitators on Base and a check of which declared x402 endpoints answer HTTP 402 with a parseable payment payload (no payment sent). Free keyless MCP server; Preflight checks a repo, package or endpoint before you connect or pay. MCP | Endpoint check | Facilitators
• SelectaRank MCP - MIT-licensed stdio MCP server for the SelectaRank Data Gateway. Exposes its x402 endpoints as tools; with a wallet key it pays automatically (per-call price cap, default 0.05 USDC), without one it returns the 402 payment requirements and spends nothing.
• settled-x402 - Pre-payment guard for @x402/fetch, @x402/axios and x402-fetch: checks each quote's payTo against Settled's own probe, test purchases and seller record, and stops risky payments before they are signed. Includes a CLI (npx settled-x402 check <url>) and Settled's MCP server over stdio.
• Shinjuku Shielded - Private x402 facilitator on Solana: an agent pays from a shielded USDC balance that it holds itself, so the chain does not show who paid. Its MCP server (shinjuku-mcp, npx -y shinjuku-shielded mcp) runs on your machine, with spend caps that only you set and Tor built in.
• stipend - Non-custodial USDC wallet on Base for AI agents, in Python. Buyer-side x402 auto-pay signed as EIP-3009 (no gas needed), with per-transaction, per-day and per-counterparty caps and a destination allowlist enforced in code before signing. Local stdio MCP server, 7 tools.
• thirdweb - Infrastructure for AI Agents (supports x402 integrations)
• x402 dotnet library
• x402 List - Directory of x402 API services with live uptime monitoring and machine-readable discovery for agents (JSON API, OpenAPI 3.1, llms.txt), plus on-chain-verified settlement volume per facilitator. Free read API and a free MCP server. API | MCP
• x402 specs - Official specification
• x402-conformance - MIT-licensed TypeScript checker that validates an endpoint's 402 response (v1 and v2) or an MCP server's initialize and tools/list. Sends only unauthenticated GETs and read-only JSON-RPC; never pays. Not an official x402 project.
• x402-idempotency - Server-side implementation of the payment-identifier extension for x402 resource servers: replays return the original response without charging again, same id with a different request gets 409. Registers as an @x402/core extension or wraps any x402 server as Node/fetch middleware. TypeScript, zero runtime dependencies, MIT.
• x402-proxy - curl for x402 paid APIs. CLI and library that auto-pays HTTP 402 responses with USDC on Base and Solana, with MCP stdio proxy for AI agents. npx x402-proxy.
• x402-python - First Python client for x402 HTTP 402 payments (Linux Foundation spec, v2). Decimal-precise nanopayment conversion, EIP-712 signing, async + sync APIs.
• x402-solana - Solana SDK for x402
• x402magic - Build payment-protected APIs in minutes with TypeScript
• x402scan - Explore and analyze x402 transactions
• x402station - Discover and monitor x402 services

x402 Developer Sandboxes & Testing

Tools and playgrounds to experiment and prototype with x402.

• x402 Cloudflare Playground - Run and test x402 flows in Cloudflare Workers
• x402 Test Page - x402 test payment

x402 Learning & Community Resources

Educational content, directories, and resource hubs.

• awesome-x402 - Curated list of x402-related projects

• BridgeNode skill - Agent skill for pay-per-request LLM inference via x402: installable skill with usage, endpoints and payment flow for AI agents.

• Firecrawl - Turn websites into LLM-ready data (useful for x402 + agentic use cases)

• x402 Ecosystem - Overview of all ecosystem participants

• x402 on Coingecko - Top x402 Ecosystem Coins by Market Cap

• AffixIO - Agentic Pay Kit with x402BeforePay host-side action attestation before pay (signed yes/no on host, not person KYC), agenticPay, mcpToolGate, and KYA createAgentTrust. (GitHub) (docs)

• HostDeFi - x402-payable token-safety API: A+–F grades, risk scores and datasets settle per call in USDC; free scan_token MCP tool also available.

• Vend - Pay-per-call data APIs for AI agents settled in Nano (XNO): clean text/markdown extraction from any URL, web search, IP geolocation, domain intelligence and Nano account info. x402-v2-conformant, no signup/no API keys. 0.0001-0.0005 XNO per call on a fee-free native rail. Full manifest at https://extract.paypercall.dev/.well-known/x402, OpenAPI at /openapi.json.