x402 SDK integration reference - x402 SDK Integration

This is SameDayDesk's independent integration reference for the open source x402 SDK. SameDayDesk uses x402 in its live pay-per-call MCP gateway and in its payment settlement tooling. This site keeps the operational guidance beside a complete, searchable Sourcey reference for the upstream Go SDK.

What is here

A map from SameDayDesk's production payment flow to the upstream x402 SDK.
A minimal TypeScript seller pattern using the same package family as our live gateway.
A generated Go reference covering 37 packages and more than 1,300 exported top-level declarations before methods and fields are counted.
Stable links to the exact upstream commit used to generate this site.

Why SameDayDesk hosts it

The SameDayDesk x402 Data Gateway exposes paid agent tools over both HTTP and MCP. Its public server installs @x402/core, @x402/evm, @x402/express, @x402/extensions, and @x402/mcp. Our settlement and self-test tooling also uses @x402/fetch. These docs are therefore part of the product's operating surface, not a generic mirror.

Use the integration guides when building against SameDayDesk. Use the API tab when you need symbol-level detail for the upstream Go implementation.

Independence and attribution

SameDayDesk is not the x402 Foundation and does not claim to be the upstream maintainer. The generated API reference comes from x402-foundation/x402 at commit 34cb6bd04c88f4333f56b9c778d3d35df997379c, licensed under Apache 2.0. Product-specific guidance is maintained by SameDayDesk.