Verify and settle payments so your API never touches on-chain logic.
A facilitator is the “payment gateway” of the agent stack: your server returns HTTP 402, the agent pays, the facilitator verifies and settles, and you serve the response. Most teams should not run their own signer, nonce store and chain RPC on day one.
This shortlist is computed from live directory signals. Pair it with the long-form facilitators explainer and the full facilitators category.
Selection criteria: name, topics or description mention facilitator, settlement verifier, or x402 settle path.
🚀 Curated list of x402 resources: HTTP 402 Payment Required protocol for blockchain payments, crypto micropayments, AI agents, API monetization. Includes SDKs (TypeScript, Python, Rust), examples, facilitators (Coinbase, Cloudflare), MCP integration, tutorials. Accept USDC payments with one line of code. Perfect for AI agent economy.
The way AI coordinates and transacts. Routing and settlement layer for your agent economy.
A decentralized micro-settlement protocol enabling autonomous AI agents to pay publishers for premium content via Circle Programmable Wallets and x402 nanopayments.
The first AA-native x402 payment stack on NERO Chain — facilitator, SDK, audited settlement contract, and a public playground showing AI agents paying APIs in USDC with paymaster-sponsored gas.
The payment rail AI agents use to get paid without human approval. Optimistic settlement on @solana. Jobs auto-finalize after a challenge period, disputed jobs escalate to a bonded arbitrator. One protocol, any agent.
Encrypted vault, ZK settlement archiving, x402 payment receipts, Agent Passport binding, and Solana anchoring for OpenClaw and agent runtimes. Drop-in stack — compression, privacy, payments, identity.
Encrypted vault, ZK settlement archiving, x402 payment receipts, Agent Passport binding, and Solana anchoring for OpenClaw and agent runtimes. Drop-in stack — compression, privacy, payments, identity.
Accept payments from AI agents. Open-source. Your data, your domain, your rules. Free forever.
The Decentralized Facilitator for Agentic Payments
A production-ready payment settlement service for the x402 protocol. Built with Elysia and Node.js, it verifies cryptographic payment signatures and settles transactions on-chain for EVM, SVM (Solana), and Starknet networks.
Golang implementation of an x402 payment facilitator
x402-exec is a programmable settlement framework for x402 protocol, combining payment verification, Hook-based business logic, and facilitator incentives in atomic transactions.
x402 payment facilitator — verifies and settles EIP-3009 USDC micropayments on Base, Arbitrum, and Ethereum.
a simple x402 demo using CDP facilitator, embedded wallet, faucet, and token balances API. Includes an x402-enabled API, and simple web app from which the user can call the API.
Off-chain credit ledger + hire marketplace for AI agents. Ed25519-signed envelopes, atomic settlement, hire-and-release escrow. https://voidly.ai/pay
DNA — Payment rails for AI agents. x402 micropayment protocol on Solana. Netting, transfer, stream settlement. Receipt anchoring on-chain.
go-x402-facilitator is a facilitator for X402 payment implemented in the Go language.
An x402 facilitator server for local development that works natively with Tenderly Virtual TestNets. Avoiding bottlenecks while working on public TestNets and using faucets for x402 development.
Aegis is a marketplace where AI agents pay for on-chain skills via instant USDC micropayments, with quality scored by NVIDIA NeMo and trustless settlement on Solana.
A TypeScript library implementing the x402 Payment Protocol facilitator pattern. This library provides payment verification and settlement functionality for both EVM and SVM (Solana Virtual Machine) networks.
Run your own payment gateway as a Docker image, or use ours online to verify and settle x402 transactions instantly.
⚔️ A one-click deploy x402 facilitator
⚡ The gold standard for x402 resources. 300+ projects, SDKs, tools, facilitators, and ecosystem data for the HTTP 402 Payment Required protocol. Curated by 24K Labs.
Stoa Protocol — The settlement layer for cross-chain AI agents. Stoa enables AI agents operating on different blockchains to discover each other, contract work, lock payment in escrow, verify outcomes, and settle instantly in USDC — without bridges, wrappers, or human intermediaries.
One-command local development environment for HTTP 402 Payment Required protocol with blockchain payments (EIP-3009 USDC)
Local x402 payment facilitator for development and testing. Fork Base mainnet with Anvil, verify and settle x402 payments locally.
Proof of Concept facilitator for accepting XMR/Monero via x402 protocol
Gas-sponsored USDC transfers on Ethereum mainnet via ERC-20 permit signatures
x402 payment facilitator — verifies and settles EIP-3009 micropayments multichain. v2 facilitator.
Self-hosted x402 payment facilitator server — verifies and settles any ERC-20 token via EIP-7702
Autonomous Agent Ecosystem SDK for Solana. Build AI agents that communicate, negotiate & transact independently using x402 Payment Protocol. 400ms settlement, USDC micropayments, A2A protocol. Token: ATHR
TypeScript SDK for the x402 payment protocol — client signing, server paywall, and facilitator integration for EVM and TRON
X402 payment facilitator for AI API billing with Solana USDC and Base USDC support.
x402 payment facilitator for AI agent micropayments on Nano (XNO)
TON blockchain facilitator for x402 payment protocol — verify and settle USDT payments via TONAPI gasless relay
List of x402 facilitators and awesome projects
Go SDK for the x402 payment protocol — client signing, server paywall middleware, and facilitator
Reference implementation of x402-BSV — stateless settlement-gated HTTP protocol over BSV
Agentic finance engine — x402 machine-to-machine payments, secp256k1 wallets, per-task billing, on-chain USDC settlement. Part of the Life Agent OS.
MCP server for x402 Service Discovery — continuously growing catalog of services, real-time quality signals, facilitator-compat checks. For Claude, Cursor, Windsurf.
HTTP 402 payment middleware for Solana (Express + Next.js). Supports x402 v2 (programmatic, facilitator-managed) and Solana Pay (QR code, on-chain) from a single integration.
A fast x402 facilitator running on cloudflare workers
OpenZeppelin Relayer - x402 Facilitator plugin
AI developer skills for implementing the x402 stateless settlement-gated HTTP protocol
💻 Spin up a complete local x402 payment server to test the HTTP 402 Payment Required protocol with blockchain payments effortlessly.
A lightweight x402 payment facilitator built with Hono. An educational re-implementation of the official Coinbase example.
x402ApiHub is a comprehensive API hub using x402 protocol ,coinbase as the facilitator and base Blockchain
A complete x402 facilitator implementation for Arbitrum
A high-performance AI agent ecosystem built on the Tron Network, integrated with the x402 protocol. This facilitator is engineered for ultra-low-cost transfers, stringent fund security governance, and highly reliable, real-time transaction processing.
Agent commerce settlement router for AI agents on Base. Split USDC into liquid working capital and routed yield.
💸 Simplify payments with x402, an open protocol for fast, fee-free digital dollar transactions. Experience seamless integration and instant settlements.
Multi-chain settlement cost router for the x402 payment protocol. Selects the cheapest or fastest blockchain for each AI agent micropayment.
An AI-payments project tracked in the mpp.best directory.
Trustless x402 facilitator running in a TEE via Oasis ROFL
Managed Solana settlement and streaming sessions for the Machine Payments Protocol
Instant payment rails for AI agents — BTC/ETH/SOL settlement, 116+ forks
A Next.js proxy implementing end-to-end x402 gateway integration — enabling payment-gated APIs and resources with on-chain USDC settlement on Solana, no accounts required.
Helper module for Nano x402 Clients, Resource Servers and Facilitators
x402 payments implementation in FastAPI & Pydantic using 1Shot API as a facilitator.
Machine Trust Protocol (MTP) — The trust layer of the machine civilization. A foundational, protocol-agnostic framework enabling verifiable machine identity, proof-of-work, and settlement across Web2, Web3, and AI systems.
Audited smart contract primitives for agent-to-agent payments, capability gating, and streamed settlement
The settlement layer for AI agent payments. Per-call billing, 10 protocols, built-in discovery. Free forever.
x402 MCP server for AI agent payments. Gasless USDC micropayments on Base L2. Claude, Cursor, LangChain, CrewAI, AutoGen, LangGraph resolve HTTP 402 with no API keys. Non-custodial, settlement-provider-agnostic, 0% fee.
Forkable x402 facilitator and server for receiving CASH payments on Solana
An aggregator proxy and control plane for x402 facilitators
Gasless x402 facilitator using ERC 4337 Smart Accounts + Account Abstraction
x402 facilitator server implementation
Real-time NBA micro-betting with on-chain USDC settlement via Tempo and MPP (Machine Payments Protocol)
x402 HTTP payment protocol implementation for the Polkadot/Substrate ecosystem — enabling pay-per-request API monetization with on-chain settlement.
x402 is an open payment protocol by Coinbase that revives HTTP 402 status for instant stablecoin payments over HTTP, enabling monetized APIs and content on blockchains like Base or Solana. It supports chain-agnostic, agentic payments without user accounts, using facilitators for verification and settlement of USDC transfers.
💳 Simplify payments with this Next.js proxy for seamless x402 gateway integration, enabling access to APIs via USDC settlements on Solana.
Cardano x402 payment facilitator — verify and settle HTTP 402 payments with ADA. Live at cardano402.com
x402 Payment Required Mini Facilitator for Solana'
Serverless REST API on AWS: ETH wallet based authorization, x402-style paid flows, USDC settlement on Base with DynamoDB-backed quotes, payments, and storage APIs.
💸 Enable seamless, low-cost digital dollar payments with x402—zero fees, instant settlement, and no high minimums for all users.
s402 — Sui-native HTTP 402 protocol. Wire-compatible with x402. Atomic settlement via PTBs.
Notes and guides for implementing x402 micropayments on APIs.
Open-source x402 payment processor for AI agents. Sub-400ms settlement on Solana + 7 EVM chains. Let LLMs pay for APIs programmatically with USDC. npm: nory-x402
TypeScript-style x402 v2 settlement adapter for XRPL in Python: issue challenges, build payment memos, verify on-ledger settlement, replay-safe.
Example of a paywalled image gallery. This uses pop402 as the facilitator to ensure that the wallet owns whatever content they are trying to view.
Smart Meta‑Facilitator (SMF) for x402 on Base – Atomic USDC escrow + Merkle batch settlement contract, TypeScript SDK, and examples for routing/settling payments on Base mainnet.
x402 Protocol Facilitator for the Nano network
SBC x402 Facilitator — verifies and settles payments using the x402 protocol (v2).
An AI-payments project tracked in the mpp.best directory.
AI coding skill for the PayAI x402 facilitator on Solana — covers payment middleware, client libraries, and protocol reference
Escrow-based settlement for Google's A2A protocol — hold funds during task execution, release on completion, refund on failure
Jagantara is a decentralized insurance for Digital Assets + staking platform on **Stacks** (Clarity) that supports **real on-chain settlement** across **USDCx / sBTC / STX** and includes an **x402-style payment gate** for AI-agent actions.
XAgent Pay — The Settlement Layer for Agentic Commerce. AI Agent autonomous payment protocol on XLayer Mainnet.
Non-custodial x402 facilitator with atomic fee splitting. Routes payments through on-chain splitter contracts on Base and Stellar
x402 payment facilitator for Flow EVM (eip155:747)
Stateless execution gateway for Solana agents. Keyless x402 payment settlement for unsigned Jupiter swap payloads. Sign locally, execute globally.
Mikachan powers private, offline-ready tap-to-pay for Web3. ZK-NFC transactions, x402-secured settlement, and autonomous payment verification—without intermediaries.
A robust middleware layer designed for the x402 ecosystem to handle deterministic verification and atomic settlement of protocol operations.
Tronizer: lightweight TRON (TRC-20) payments API — micropayments, webhooks, 24/7 settlement, no chargebacks.
Every project in this collection meets these criteria: name, topics or description mention facilitator, settlement verifier, or x402 settle path. The list is computed from our live crawl of 1.5k+ open-source repositories — it is not hand-picked or pay-to-list.
The underlying data (stars, activity, new repositories) is refreshed by our crawler on a weekly cycle, so collections re-compute with each deployment.
Submit it from the Submit page. Once crawled and classified, it automatically qualifies for every collection whose criteria it meets.