Challenge precisely
Terms must be parseable and bound to the actual resource request.
Agent Commerce & Security · PDF FIELD GUIDE · 2026
x402 Integration Checklist
The x402 Integration Checklist is a 4-page PDF field guide (SKU SML-X402-009) from SCRIPTMASTERLABS, sold as a one-time $29 purchase covering the full paid-request lifecycle from challenge construction to accepted delivery, with a practical checklist, truth boundary, and primary sources.
A production path from challenge construction to accepted delivery
SML-X402-0094-PAGE PDF$29 ONE TIMEINSTANT DELIVERY
THE OUTCOME
What outcome does this checklist deliver?
This checklist delivers the implemented and tested complete paid-request lifecycle, including unhappy paths.
Use this guide to: Review an x402 integration from HTTP challenge through payment verification and resource delivery.
CORE MODEL
What are the four ideas before action?
Before action: challenge precisely, verify before work, make fulfillment deterministic, and observe every stage.
Verify before work
Confirm proof, amount, asset, recipient and freshness before expensive execution.
Make fulfillment deterministic
The same valid paid request should not produce conflicting billing outcomes.
Observe every stage
Logs should distinguish quote, payment verification, execution and delivery acceptance.
ACTION CHECKLIST
What is the six-step review process?
The six-step review process: choose supported network and asset; create signed or integrity-protected terms; add replay and idempotency controls; test insufficient and expired payments; return structured receipts; run recovery and reconciliation drills.
- Choose supported network and asset
- Create signed or integrity-protected terms
- Add replay and idempotency controls
- Test insufficient and expired payments
- Return structured receipts
- Run recovery and reconciliation drills
PRIMARY SOURCES
How do you verify the moving parts?
The PDF includes a source map and explicit research boundary. Product and regulatory details can change; current official material controls.
x402 protocol documentation →x402 specification repository →Model Context Protocol specification →OWASP API Security Top 10 →TRUTH BOUNDARY
Use the current x402 specification; examples may change as the protocol evolves.
AI tools assisted drafting and layout. SCRIPTMASTERLABS is responsible for editorial structure and source selection. No personalized investment, legal, tax, medical, regulatory, advertising or cybersecurity advice.
FAQ
What should you know before you buy?
Before buying: it is a four-page PDF delivered after successful Stripe Checkout, a one-time purchase — and it does not guarantee a result: use the current x402 specification, as examples may change as the protocol evolves.
What format is this product?
A four-page PDF field guide delivered immediately after successful Stripe Checkout.
Is this a subscription?
No. It is a one-time purchase.
Does this guarantee a result?
No. Use the current x402 specification; examples may change as the protocol evolves.
What is included in this PDF?
4 pages in a fixed-layout PDF: HTTP challenges, payment verification and resource-delivery checks. This is a compact field guide with review checks and source notes.