> ## Documentation Index
> Fetch the complete documentation index at: https://docs.x402.org/llms.txt
> Use this file to discover all available pages before exploring further.

# Third-Party Extensions

> Packages built by ecosystem partners that extend x402 beyond the core specification.

| Name                                                                | Description                                       | Languages          | Links                                                                                                                                     |
| ------------------------------------------------------------------- | ------------------------------------------------- | ------------------ | ----------------------------------------------------------------------------------------------------------------------------------------- |
| [World AgentKit](https://docs.world.org/agents/agent-kit/integrate) | Verify human-backed agents                        | TypeScript         | [GitHub](https://github.com/worldcoin/agentkit) · [npm](https://www.npmjs.com/package/@worldcoin/agentkit)                                |
| [OMATrust](https://www.omatrust.org/x402)                           | Key authorizations for Signed Offers and Receipts | TypeScript         | [GitHub](https://github.com/oma3dao/omatrust-sdk) · [npm](https://www.npmjs.com/package/@oma3/omatrust)                                   |
| [PEAC Protocol](https://x402.peacprotocol.org)                      | Verifiable receipts for x402 payments             | TypeScript         | [GitHub](https://github.com/peacprotocol/peac) · [npm](https://www.npmjs.com/package/@peac/adapter-x402)                                  |
| [x402r](https://x402r.org)                                          | Non-custodial refund and arbitration protocol     | Typescript         | [GitHub](https://github.com/BackTrackCo/x402r-sdk) · [npm](https://www.npmjs.com/package/@x402r/sdk)                                      |
| [zauth](https://zauthx402.com)                                      | Monitoring, verification, and refund SDK          | TypeScript         | [GitHub](https://github.com/zauthofficial/zauthSDK) · [npm](https://www.npmjs.com/package/@zauthx402/sdk)                                 |
| [x402aff](https://github.com/MiroShark/x402aff)                     | Affiliate builder-code revenue splits             | Python, TypeScript | [GitHub](https://github.com/MiroShark/x402aff) · [PyPI](https://pypi.org/project/x402aff/) · [npm](https://www.npmjs.com/package/x402aff) |