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@facilitator/server

v0.4.0

Published

Unified x402 facilitator server — supports EIP-7702 (any ERC-20) and ERC-3009 (USDC) payment mechanisms

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Links

Git

Maintainers

melonaskmelonask

Keywords

Readme

@facilitator/server

Unified x402 facilitator server supporting both EIP-7702 (any ERC-20 like USDT + native ETH) and ERC-3009 (USDC) payment mechanisms.

Installation

npm install -g @facilitator/server

Usage

Multi-Chain

Run the server with support for multiple chains and fallback RPCs:

npx @facilitator/server \
  --relayer-key 0x... \
  --chain 1=https://,https:// \
  --chain 137=https://polygon-rpc.com

Format: --chain <chainId>=<rpcUrl1>,<rpcUrl2>,...

Single-Chain

npx @facilitator/server \
  --relayer-key 0x... \
  --rpc-url https://mainnet.infura.io/v3/...

The chain ID is auto-detected from the RPC endpoint.

CLI Options

| Option | Default | Description | | -------------------- | ----------- | --------------------------------------------------------------------------- | | --port | 8080 | Server port | | --host | 0.0.0.0 | Server host | | --relayer-key | required | Private key (hex) — pays gas | | --chain | optional | Config per chain: id=url1,url2. Can be used multiple times. | | --delegate-address | auto-detect | Deployed Delegate.sol address (overrides known preset for all chains) | | --rpc-url | optional | Legacy: Single EVM JSON-RPC endpoint (auto-detects chain ID) |

API Endpoints

| Endpoint | Method | Description | | -------------- | ------ | ------------------------------------------------- | | /verify | POST | Verify payment signatures and balance (read-only) | | /settle | POST | Verify + submit on-chain transaction | | /supported | GET | Supported schemes, networks, signers | | /healthcheck | GET | { status: "ok" } | | /info | GET | Relayer ETH balance |

Supported Mechanisms

| Mechanism | Scheme | Token Support | How It Works | | --------- | --------- | ---------------------------------------------- | ------------------------- | | EIP-7702 | eip7702 | Any ERC-20 (USDT, DAI) + native ETH | Account-level delegation | | ERC-3009 | exact | Tokens with transferWithAuthorization (USDC) | Token-level authorization |

Dependencies

License

MIT