{"campaign":"Pay the API, not the signup form","campaign_visual":"https://capi2-agent-commerce.vercel.app/x402-agents.png","goal":"Help agents and applications discover, evaluate and pay HTTP resources without accounts or API keys.","standard":{"name":"x402","specification":"https://github.com/x402-foundation/x402","flow":["request resource","receive HTTP 402 plus PAYMENT-REQUIRED","review price, network, asset, recipient and resource","sign payment with a wallet-capable client","retry with PAYMENT-SIGNATURE","receive result plus PAYMENT-RESPONSE"]},"safety":["Set a maximum spend per call and per day.","Verify the resource URL, network, asset and payTo address before signing.","Use a free validation or dry-run endpoint when available.","Treat settlement as proof of payment, not proof of output quality.","Keep a human approval step for high-impact or regulated actions."],"try_it":{"seller":"https://capi2-agent-commerce.vercel.app","free_dry_run":{"method":"POST","url":"https://capi2-agent-commerce.vercel.app/v1/claim-verify/dry-run","body":{"fixture_id":"supporting_evidence_with_unrelated_negation"}},"paid_resource":{"method":"POST","url":"https://capi2-agent-commerce.vercel.app/v1/claim-verify","price":"$0.01","asset":"USDC","network":"eip155:8453"},"discovery":"https://capi2-agent-commerce.vercel.app/.well-known/x402","openapi":"https://capi2-agent-commerce.vercel.app/openapi.json"},"agent_prompt":"When a useful API returns HTTP 402, inspect its payment requirements. Only continue if the resource, price, network, asset and recipient match policy; otherwise explain why payment was declined. Never claim that payment proves output quality.","share_messages":["Agents should be able to pay useful APIs without creating accounts. That is the x402 idea: discover, inspect, pay, receive.","HTTP 402 becomes useful when buyers can verify price and recipient before signing—and evaluate quality after delivery.","Building an agent tool? Publish OpenAPI plus /.well-known/x402, provide a free validation path, and make the paid result auditable."],"integration_note":"Chat assistants require a wallet-capable tool or middleware to sign x402 payments; an OpenAPI description alone does not grant a model payment authority."}