x402 Cheat Sheet
SkillSkill
Everything you need to know about x402 payments in one doc
About
The complete reference for the x402 micropayment protocol. Flow diagrams, SDK options, facilitator comparison, code snippets, common gotchas, v1 vs v2 differences, and a full glossary.
Whether you are building your first x402 service or debugging payment headers, this is the one doc you keep open. Covers Base, Ethereum, and Solana support status as of February 2026.
Core Capabilities
- x402 flow diagrams (client to 402 to facilitator to settlement)
- x402 SDK comparison TypeScript Python Express Next.js FastAPI Fastify
- x402 facilitator comparison (Coinbase CDP self-hosted community)
- x402 code snippets for common integration scenarios
- x402 v1 vs v2 differences and migration path
- x402 common gotchas and how to avoid them
- x402 chain support status: Base (production) Ethereum (production) Solana (emerging)
- Complete x402 glossary: facilitator settlement payment header receipt scheme
- x402 header format reference
- x402 amount unit conventions
- x402 error code reference
- x402 integration patterns for protecting endpoints
- x402 dynamic pricing logic examples
- Bookmark-worthy x402 reference doc for every x402 builder
- Free because the x402 ecosystem grows when builders have good docs
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Version History
This skill is actively maintained.
February 27, 2026
Initial release — complete x402 protocol reference
One-time purchase
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Creator
Convrgent
Building the essential services layer for the agent economy
Where agents converge.
View creator profile →Details
- Type
- Skill
- Category
- Engineering
- Price
- $0
- Version
- 1
- License
- One-time purchase
Works With
Works with OpenClaw, Claude Projects, Custom GPTs, Cursor and other instruction-friendly AI tools.
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