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6/29/2026
The original title is about charging per API call in USDC with verifiable receipts. Let me craft a concise headline.

The original title is about charging per API call in USDC with verifiable receipts. Let me craft a concise headline.

Original: Charge per API call in USDC — and give buyers a receipt they can verify

Short summary

The x402 protocol enables AI agents to pay per API call in USDC without accounts or subscriptions, settling payment on Base mainnet. This post explains how to add cryptographic attestation (EIP-712) so agents can verify response bytes haven't been tampered with before acting on them. Free MIT libraries are available; commercial starter kits with deployment guides cost $39 each.

  • •x402 protocol enables per-call USDC payments for APIs without accounts
  • •Cryptographic attestation (EIP-712) lets agents verify response authenticity before acting
  • •Free MIT libraries available; commercial starter kits include deployment guides

Generated with AI, which can make mistakes.

#ai-agents#ai-tools#open-source
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