- x402
- Protocol for implementing HTTP 402 using blockchain payments.
- Payment Challenge
- A cryptographic token containing payment requirements (price, recipient, network, expiry).
- Access Token
- A JWT issued after payment verification for session-based access.
- Payment Proof
- Transaction hash and signature proving payment was made.
- Verification
- On-chain confirmation that payment exists and matches requirements.
- Quota
- Usage allocation for metered billing (e.g., API tokens, bytes).
- Receipt
- Proof of payment issued by the server after verification.
- Middleware
- Server-side code that handles payment challenges and verification.
- EIP-1193
- Standard Ethereum provider interface used by wallets.
Glossary
Key terms and definitions.