Add Grant Proposal x402 Canton Adapter

Development Fund Proposal Submission

Proposal file: /proposals/grant-proposal-x402-canton-adapter.md

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Summary

The x402-Canton Adapter is an open-source, fully audited infrastructure layer that enables native HTTP micropayments on the Canton Network.

It introduces a standardized payment primitive for API monetization, allowing developers to integrate pay-per-call access via middleware without custom DAML contracts or external payment rails.

Canton Network currently lacks a standardized payment primitive for API monetization, forcing developers into complex custom DAML logic, off-chain or cross-chain payments that break privacy, or no monetization at all — a gap that the x402-Canton Adapter directly addresses.

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Checklist

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

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Notes for Reviewers

• Fully open-source (Apache 2.0)
• Fully audited (delivered as part of the grant)
• Designed for compatibility with Canton 3.x
• Built with privacy-preserving architecture aligned with Canton’s model
• Modular and extensible for future protocol evolution

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Relevant Expertise

• DAML + Canton integrations
• Payment systems and transaction pipelines
• Middleware and API infrastructure (Node.js, Golang)
• Cross-chain and off-chain/on-chain communication layers