> ## 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://docs.omatrust.org/integrations/x402/overview)    | Onchain EAS reputation from x402 signed offers and receipts | TypeScript | [GitHub](https://github.com/oma3dao/developer-docs) · [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)  |