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X402_HEADER_IDEMPOTENCY_KEY

const X402_HEADER_IDEMPOTENCY_KEY: "Idempotency-Key"

Defined in: src/x402/encoding.ts:71

Name of the optional request header that carries a reasoning-step idempotency key (M5-1). Standard Idempotency-Key (IETF draft / Stripe-compatible). When present, the x402 server deduplicates on this logical key; the EIP-3009 nonce remains the on-chain fund backstop. See docs/rfc/m5-1-reasoning-step-idempotency.md.