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title sidebar_position sidebar_label description
x402 on Stellar
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x402 on Stellar
Use the x402 protocol for per-request HTTP payments on Stellar, with support for AI agents and APIs.

What is x402?

x402 is an open protocol from the Coinbase Developer Platform that enables programmatic, per request payments over HTTP, designed especially for AI agents and APIs. It effectively turns the old “402 Payment Required” HTTP status code into something usable, for both humans and AI agents.

On Stellar, x402 works with Soroban authorization so that clients can pay for API requests via signed auth entries, ideal for micropayments and payment enabled apps. To build an x402-enabled service or integrate payments into your app, see Build Applications and the resources below.

Demo

Try the x402 Demo. Send an x402 payment on Stellar Testnet or Mainnet and see the x402 payment flow in action. (source code)

x402 demo

x402 Compatible Wallets

To support x402 on Stellar, a wallet must support auth-entry signing (Soroban authorization entry signing). The following wallets support auth-entry signing:

  • Freighter Browser Extension
  • Albedo
  • Hana
  • HOT
  • Klever
  • OneKey

:::note

Freighter Mobile does not currently support x402; use the Freighter browser extension. Mobile support is planned for a future release.

:::

x402 Facilitators

You can use a facilitator to verify and settle x402 payments. Two options are available for Stellar:

Coinbase x402 Facilitator

Coinbase’s x402 facilitator supports Stellar on testnet with sponsored fees. Check which networks and options are supported:

Build on Stellar Relayer (with OpenZeppelin x402 Plugin)

The Relayer Plugin for x402 implements the x402 Facilitator API so you can serve x402 payments directly from a Relayer instance. The x402 Facilitator leverages the OpenZeppelin Relayer Framework. It works with the Coinbase x402 ecosystem and exposes the expected /verify, /settle, and /supported endpoints under the Relayer plugin router.

How to Use

This x402 facilitator service is now live on Testnet and Mainnet. Under the hood, the plugin leverages OpenZeppelin Channels to submit transactions onchain via a managed Relayer and Facilitator setup.

Testnet

To use the facilitator on testnet, you will need:

  • An API Key (Relayer Service). Generate your testnet API key here: https://channels.openzeppelin.com/testnet/gen
  • Facilitator URL. Use the following facilitator endpoint in your configuration: https://channels.openzeppelin.com/x402/testnet

Mainnet

To use the Facilitator on mainnet, you will need:

  • An API Key (Relayer Service). Generate your mainnet API key here: https://channels.openzeppelin.com/gen
  • Facilitator URL. Use the following facilitator endpoint in your configuration: https://channels.openzeppelin.com/x402

:::note

This version supports x402 v2 specification. For x402 v1 support, please use a previous version of this plugin (check git history for v1 compatible releases).

:::

Examples

  • x402 on Stellar (Stellar repo) — Tools, examples, and references for the x402 protocol on Stellar. Use this as the canonical source for Stellar-specific x402 demos and tooling. View on GitHub
  • x402 Starter Template — A starter template for building payment-enabled applications with x402. Simplified scaffolding demonstrating x402 payment protocol integration with browser wallet support; use it as a foundation for micropayment-enabled services, SaaS applications, or any project that needs frictionless web payments. View on GitHub
  • Economic Load Balancer — An intelligent multi-chain payment router that automatically selects the most cost-efficient network for high-frequency AI agent micropayments. View on GitHub
  • 1-shot Stellar x402 app — Example x402 app with a video paywall and guide for building payment-enabled apps on Stellar. View on GitHub

Additional Documentation

Learn more