x402 Seller Growth Tools: X402 Release Readiness Audit

Overview

Run a no-payment x402 release audit for public HTTPS discovery, live 402 quote terms, receipt reconciliation, and duplicate-delivery blockers. Seller action plan first: $0.019 for prioritized x402 conversion fixes, buyer-ready copy, and a retest checklist, with a free buyer-shortlist preview. Start buyer evaluation at https://x402-seller.558686.xyz/x402/buyer-use-cases or machine JSON https://x402-seller.558686.xyz/x402/buyer-use-cases.json; checkout contract JSON is https://x402-seller.558686.xyz/x402/checkout.json. Route payment activation JSON is https://x402-seller.558686.xyz/x402/route/x402-release-readiness-audit/payment-activation.json. Browsers can inspect the quote, but payment requires a buyer-owned runtime that signs and retries the same request with X-PAYMENT. Buyers can download the route-specific first-payment client at https://x402-seller.558686.xyz/x402/route/x402-release-readiness-audit/first-payment-client.mjs, run node first-payment-client.mjs for quote-only checks, then opt into a buyer-owned x402 payment with PAY_REAL_X402=1. Copy-ready first paid request: curl -fsSL https://x402-seller.558686.xyz/x402/route/x402-release-readiness-audit/first-payment-client.mjs -o first-payment-client.mjs && npm install @x402/fetch @x402/core @x402/evm viem && PAY_REAL_X402=1 EVM_PRIVATE_KEY=$EVM_PRIVATE_KEY node first-payment-client.mjs. Generic clients can also discover it from the live 402 response headers: the standard Payment-Required header includes firstPaymentClient, paymentClientUrl, and sameRequestRetryRequired pointers; X-First-Payment-Client, X-Download-Install-Then-Pay-Command, and Link rel=payment-client mirror the same handoff.

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