Payments infra

The default open facilitator for verifying and settling x402 payments on Base Sepolia. The zero-config starting point for every testnet integration.

The first x402 facilitator on Ethereum mainnet, using mev-commit preconfirmations for ~1.2-second, fee-free USDC settlement. Fills the gap left by Base/Solana-only facilitators; agents only need USDC — no ETH gas required.

Free hosted x402 facilitator extending the ecosystem beyond Base to SKALE and Robinhood Chain. Supports USDC, EURC, USDG, and PR tokens via EIP-3009 and Permit2. Offers three payment schemes: exact, usage-based (upto), and batch-settlement channels. No fees.

Managed platform for deploying x402-paid API endpoints. Write a TypeScript handler, set your price ($0.000001/req min), run `bankr x402 deploy`. The x402 layer is injected automatically; endpoints live at x402.bankr.bot and are agent-discoverable. USDC on Base. Free to start, 5% fee on earnings.

Non-custodial marketplace for paid HTTP APIs using x402 + USDC on Base. 13-tool MCP server (npx @gatefare/mcp) for API discovery, automated 402 payment handling, and publishing. Payments split 90% publisher / 10% platform via 0xSplits contracts.

x402-powered API marketplace ('UK's API Marketplace for AI Agents'). ~27 live APIs / 222 endpoints across property, companies, weather, vehicle and financial data. Agents discover and pay per request; settles in USDC on Base. Free to list, 3% platform fee.

European x402 facilitator and EUR settlement layer for AI agent payments. Verifies USDC/EURC/EURCV micropayments on Base, Polygon, Arbitrum, Optimism and Ethereum, then settles to EUR via SEPA Instant in under 10 seconds. Adds KYA trust scoring and ERC-8004 identity attestation.

Hosted x402 reverse proxy: create a pay-per-request gateway in front of any existing API in minutes. Set a USDC price per request, share the proxy URL, and collect micropayments on Base automatically.

MCP server with a live, auto-updating catalog of x402 services (scans every 6 h). Nine tools: keyword search, health checks, compliance scans, trust attestation, and autonomous payment relay at max($0.003, 2.5%) per tx.

Verification and trust infrastructure for x402 endpoints. Runs free readiness checks on 402 challenge behavior and manifests; publishes reports agents inspect before paying. Payable services: Agent Trust Scan ($0.01), Reputation Lookup ($0.001), endpoint listing/registration. USDC on Base.

Agent-to-agent commerce protocol and discovery layer: one MCP server (catalog, product, purchase, affiliate, commissions tools) indexing 114 x402-payable products across multiple vendors. Agents earn affiliate commissions; 1% protocol fee; $0.01 on-chain settlement per purchase.

183 tools across 33 categories: AI inference with 200+ LLM models, DeFi swaps and bridging, batch payments, invoicing, escrow, analytics, and onchain infrastructure. USDC on Base and multi-chain.

Pre-trade endpoint health checker for trading agents: verifies a target x402 endpoint is fresh, fast, and live before a trade. Returns staleness, p95 latency, success rate, consecutive failures, and drift alerts. $0.002 USDC per check on Base mainnet.

Signed proof-receipt service for AI agents that pay APIs. Generates 4-part evidence bundles: endpoint trust score, payment expectation receipt, fulfillment receipt, and refund-dispute package. $0.003 USDC per evaluation on Solana mainnet.

Hosted x402 payment facilitator for usage-based AI agent, SaaS and app payments. Handles verification and instant (sub-second) settlement of stablecoin micropayments; also offers an x402 Echo Merchant test sandbox with refunded test transactions.

First x402 facilitator for TRON, supporting USDT, USDC, and USDD (TRC20) with sub-3-second confirmation. Exposes 12 payable TRON API endpoints at $0.01: account info, energy estimation, swap quotes, USDT transfers with auto energy provisioning, and batch transfers. Also supports USDC on Base.

Python x402 payment layer that auto-pays USDC on Solana with zero code changes for httpx/requests users. ~0.5 s payment latency, 6-layer budget protection, 775+ tests. Includes ag402-client-mcp for MCP integration with Claude Code and Cursor.

Open-source self-hosted x402 facilitator for Solana and USDC with MCP-native pay-per-tool-call. The facilitator verifies signed payment payloads, submits USDC transfers on-chain, and abstracts SOL gas from agents. Integrates with Eliza, Vercel AI SDK, and LangChain; devnet validation complete.

Programmable payment layer for AI agents on Solana, Base, and Tempo. Middleware catches HTTP 402 signals in real-time, settles payments on-chain within milliseconds, and provisions non-custodial wallets per agent with spending limits, time-locks, and whitelist policies.

Managed x402 client payment infrastructure for Amazon Bedrock agents: automatic wallet provisioning, policy-based per-agent spend limits, per-session caps, and a unified audit trail. Agents pay x402-gated APIs with no custom payment code.

Generally-available x402 payment gating for CloudFront distributions via WAF Bot Control rules. Any CloudFront-fronted resource can charge per-request USDC on Base or Solana; no cost beyond standard WAF pricing.

Hono middleware for gating API endpoints behind x402 USDC payments. Supports recurring payment agreements, SIWx sessions for returning customers, and local on-chain verification without an external facilitator dependency. Base mainnet.

TypeScript SDK combining x402 payments (fetch402, smartFetch402 with best-provider routing) and ERC-4337 gasless smart accounts. Includes payment agreements, XMTP messaging, reputation tracking, and ERC-8128 signatures. Base mainnet and Sepolia.

Privacy-preserving x402 facilitator and API gateway from Brave that uses OHTTP relay and Privacy Pass tokens so no entity can link payments to API usage or client identity. Built in TypeScript on Solana; designed for anonymous agent-to-API transactions.

Decentralized x402 facilitator using Byzantine Fault Tolerant consensus via Chainlink CRE nodes. Supports Base, Ethereum, and 0G Mainnet with USDC. Self-hostable via Docker; managed service charges 1% flat fee.

Charge for any web page, dataset, API, or MCP tool behind Cloudflare. Stablecoin settlement over x402 with no payments stack of your own. Waitlist opened July 1, 2026.

Drop-in x402 payment middleware for ElysiaJS servers — add per-route USDC pricing to a Bun API in a few lines.

Billing, credit, and spend management for autonomous AI agents. Routes payments to 2,000+ vendor APIs via x402 with programmable hard spend caps, sub-cent settlement (~50ms), and collateralized credit lines. Integrates with LangChain, CrewAI, Claude MCP, and OpenAI Agents. USDC on Base.

x402 payment facilitator and agent wallet infrastructure: AEP2 (Agent Embedded Payment Protocol) for sub-second settlement, FluxA AI Wallet, AgentCard, and AgentCharge. Reports 136K agent wallets and 200K+ monthly payment requests on Base.

Open EIP-3009/EIP-712 signing library for x402 with zero ethers/web3 dependency. Available in JavaScript (npm) and Python (pip) with byte-identical wire formats. Optional inference routing through hivecompute with ZK attestation. MIT licensed.

TypeScript SDK for building AI agents that sell and buy services via x402, A2A, and AP2 protocols. Transforms typed functions into discoverable paid endpoints with built-in payment admission, idempotency, and accounting.

Payment layer for MCP servers and plain HTTP APIs. Wrap existing servers with per-call x402 pricing; includes hosted registry and createPaidMcpHandler tooling.

MCP server that signs x402 payment headers from a provided key — lets any MCP-capable agent pay for x402 resources without native wallet support.

Multi-chain x402 SDK for AI agents: drop a single moltspay.services.json to monetise any existing function. Supports Base, Solana, Polygon, BNB Chain, and fiat rails (Alipay/WeChat Pay CNY). Includes MCP server integration.

Open-source, one-function SDK to add x402 pay-per-request pricing to any Express, Next.js, or MCP server. Non-custodial: payments flow directly to the developer's wallet. 75M+ transactions settled.

Agent-payments platform providing an x402 facilitator that coordinates authorization, metering, entitlements and settlement. Supports pay-per-call in USDC on Base plus fiat (Stripe/bank); integrated via npm (TypeScript) and pip (Python) SDKs.

Multi-chain x402 payment infrastructure with SDKs in TypeScript, Python, Rust, Go, and C. Enables pay-per-request API monetization on Base and Solana with one-line middleware integration.

Solana-based agent payment MCP: lets AI agents pay x402-protected resources, send USDC to wallets/emails/phone numbers, and create payment links with webhooks. Non-custodial; unclaimed funds auto-refund after 3 days. Compatible with Claude, ChatGPT, n8n, Flowise, and LangChain.

Starter templates for monetizing MCP servers three ways: no-code (xpay), DIY x402 (USDC, ~50 LOC), and Stripe metered billing. TypeScript, with demo tools (summarize, sentiment, keyword extraction).

TypeScript and Python SDK for AI-agent x402 payments. Supports USDC and EURC on Base, Optimism, Arbitrum, and Polygon. Hosted facilitator at api.paybotcore.com; human-in-the-loop approvals and micropayment batching built-in.

Provider-agnostic Python payment middleware for MCP servers. Adds @price decorators for pay-per-request billing; supports x402 (USDC on Base and Solana) plus Stripe, PayPal, Coinbase Commerce and others, with Mode.AUTO selecting a provider by client capability.

Multi-chain x402 SDK and MCP server for AI agents: 29 chains (EVM + Solana, TON, Tron, NEAR, Sui, Aptos, Stellar, XRP). @piprail/mcp gives agents discover, quote, pay, and budget tools. @piprail/sdk lets any API gate itself — zero platform fee, funds settle direct to wallet.

MCP server for cross-chain USDC bridging between Base, Algorand, and Voi Networks via x402 micropayments and the Aramid bridge protocol. AI agents request transfers by natural-language prompt; payments are executed automatically.

Universal x402 payment facilitator written in Rust, supporting Base, Avalanche, Polygon, Solana, and Sei. Processes stablecoin micropayments (USDC, USDT) for both humans and AI agents across multiple blockchains.

Stripe preview integration lets developers charge AI agents for API calls, MCP tool invocations, and HTTP requests via USDC on Base using the PaymentIntents API. Includes open-source purl CLI and Node/Python code samples.

Official x402 Python SDK on PyPI, providing FastAPI/Flask middleware to gate endpoints behind USDC payments plus an auto-pay client session for buyers.

CDP's discovery layer for x402. Indexes payable API endpoints (payment metadata plus on-chain trust signals) that settle through the CDP facilitator; browsable via GET /v2/x402/discovery/resources and a semantic /search. Services auto-list on first settled payment with discoverable:true.

Official x402 example implementations (TypeScript, Python, Go) showing payment-gated HTTP endpoints and matching clients across Express, Next.js, Hono, FastAPI and more - reference starting points for building x402 sellers and buyers.

Drop-in FastAPI paywall decorator for Python AI agent routes. One decorator adds HTTP 402 USDC micropayments to any endpoint with no signups. Supports Base, Polygon, Arbitrum, and Solana via x402 v2.10+ with Coinbase's hosted facilitator.

Official Express.js middleware for x402. One line of middleware gates routes behind USDC payments and forwards signed payments to a facilitator's /verify and /settle endpoints; defaults to the x402.org facilitator on testnet.

Production Go library for x402: server middleware for net/http, Chi, Gin, and PocketBase; HTTP client with automatic payment handling; MCP integration. USDC on 8+ chains (Base, Polygon, Avalanche, Solana). The canonical Go x402 SDK.

Official Hono middleware for x402 (usable on Cloudflare Workers and other edge runtimes), gating routes behind USDC payments settled via an x402 facilitator.

Modular, framework-agnostic Rust SDK for building x402 integrations: x402-signer (buyer signing + reqwest middleware), x402-paywall (framework-agnostic HTTP middleware, Axum examples), and x402-core. Ships new networks without upstream PRs.

Open-source wrapper over mcp-handler adding paidTool() to Next.js MCP servers, plus withPayment() for AI SDK clients. The reference x402+MCP integration.

Official Next.js App Router middleware for x402, gating routes/handlers behind USDC payments verified and settled through an x402 facilitator.

Drop-in replacement for the OpenAI Python client that adds transparent x402 micropayment support. When a server responds with 402, the library automatically signs and retries with USDC — no code changes required.

Production-grade Rust toolkit for x402: protocol types, Axum server middleware (x402-axum), a reqwest client wrapper (x402-reqwest), and a self-hostable facilitator server binary with Docker images.

Zero-SDK hosted x402 proxy: connect a wallet, point at your backend, get a paywalled proxy URL on Base. Customers pay USDC per request; operator receives 99% with real-time revenue analytics. Beta: 1% take rate, up to 5 routes. Open-source MIT core (x402-kit) for self-hosting.

Ecosystem explorer/aggregator for x402 (live at x402scan.com). Lets users and agents discover x402 servers, monitor on-chain transaction volumes, and call resources via an embedded wallet; aggregates facilitator configs and accepts community resource registration.