Funding Proposal by FTP: x402 Protocol Integration for Canton

[Denend]

Development Fund Proposal Submission

Proposal file:
Link to the proposal added in this PR: /proposals/x402-by-ftp-team.md

---

Summary

This proposal introduces a complete x402 payment protocol integration for the Canton ecosystem, enabling Canton Coin to function as a native payment scheme for machine-to-machine HTTP payments. The project delivers a Canton x402 facilitator, a client SDK for developers and autonomous AI agents, and resource server middleware that allows any Web2, Web3 company or individual to monetize API endpoints with per-request payments using $CC. CanTrustAI will serve as the live reference implementation demonstrating the full stack in production.

---

Checklist

• Proposal file added under /proposals/
• Milestones and funding amounts defined
• Acceptance criteria included
• Alignment with Canton priorities described

---

Notes for Reviewers

This proposal fills a concrete infrastructure gap: Canton Coin is currently not supported in the growing x402 ecosystem used for autonomous agent payments. The requested funding includes a retroactive component recognizing the existing CanTrustAI delivery, which already demonstrates per-request API payment settlement. The forward workstreams focus on delivering open-source, reusable infrastructure (facilitator, SDK, and middleware) so any Web2 or Web3 company or individual can adopt the x402 payment model with minimal integration effort.

Relevant delivered work

• Visualization of the architecture - https://cdn.ftptech.xyz/cantrustai_architecture.html
• Devnet link - https://dev.cantrustai.xyz