Good Meta

x402 Facilitator

Production payment facilitator for the x402 protocol. Verifies and settles stablecoin payments with support for exact and up-to payment schemes.

View Capabilities goodmeta.co

Payment Schemes

Exact & up-to settlement

Exact
ERC-2612 Permit
Fixed-amount payments. Agent signs for the exact cost. Two on-chain transactions: permit + transferFrom.
Up-to
Permit2 + Witness
Variable-amount payments. Agent signs a max, server settles the actual cost. One on-chain transaction via proxy.
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Payment Verification

Validates EIP-712 signatures, on-chain balances, token allowances, and time windows before granting resource access.

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On-Chain Settlement

Executes token transfers on-chain after verification. Supports zero-amount settlement for up-to scheme when actual cost is $0.

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Protection

Nonce replay prevention, rate limiting, gas estimation dry-runs, deadline safety margins, and input size limits.

API

Endpoints

GET /supported Capability discovery
POST /verify Payment verification
POST /settle Payment settlement
GET /health Health check

Networks

Supported chains

Base
Mainnet & Sepolia
Solana
Mainnet