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  • Java client SDK
    • Getting started
    • Example client
  • Java server SDK
    • Getting started
    • Example server
    • Configuration
  • Faciliator server
    • Getting started
    • Verifications
  • Learning X402
    • Protocol explanation
      • Get /weather without X-PAYMENT
      • Get /weather with X-PAYMENT
      • Payment verification on server
      • Payment settlement on server
    • X402 hands-on
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Welcome, we are building X402 tools with and for Java!

NextRoadmap & ideas

Last updated 50 minutes ago

Java client SDK

provides methods to retrieve payment requirements from an X402 URL, generate a signed payload, and send it to the server. It also allows you to collect the settlement information returned by the server.

Java server SDK

allows pay-gated APIs for humans and AI agents with in one Spring annotation. It turns any route into a pay-per-call endpoint using the x402 protocol. It deals with the payment and unlocks the resource.

Facilitator server

The is your back-end gateway for processing x402 payments on-chain. It verifies and settles transactions, acting as a trusted bridge between clients and smart contracts.

Examples

A of a and a

x402 Java client
x402 Spring boot starter
Mogami Facilitator server
project showing a x402 complete example
server protected URL
client paying to access it.