Is your feature request related to a problem? Please describe.

Currently, the x402_a2a package only provides Python support, which limits adoption for TypeScript/JavaScript developers in the Node.js ecosystem. This creates friction for:

• Web/Node.js developers wanting to integrate with x402 payment protocol
• TypeScript applications needing type-safe bindings
• JavaScript ecosystem tools requiring native npm package support
• Developers seeking parity with Python implementation features

Describe the solution you'd like

I have already built a complete TypeScript implementation mirroring the Python package:

Implemented modules in typescript/x402_a2a:

• ✅ types.ts: Full type definitions (Task, Message, PaymentPayload)
• ✅ extension.ts: Header-based activation helpers
• ✅ core/utils.ts: Task/Message metadata operations
• ✅ core/protocol.ts: x402 verify/settle delegation
• ✅ core/wallet.ts: Payment signing with maxValue
• ✅ executors/: Server (verify→delegate→settle) and client flows

Key features:

• Full parity with Python implementation
• Runtime x402 package integration
• Type-safe APIs and strict checks
• Comprehensive test coverage

We can submit a PR for review that includes this complete implementation, along with tests and documentation.

Describe alternatives you've considered

No response

Additional context

I am actively working with the Google Cloud Platform team and have completed the partner support process. Our goal is to contribute meaningfully to the protocol

We have:

• Filled out the partner support form
• Tested the implementation against the protocol specifications
• Ensured compatibility with existing Python behaviors

This implementation will help expand x402's reach into the JavaScript/TypeScript ecosystem while maintaining the protocol's security and reliability standards.

Code of Conduct

• I agree to follow this project's Code of Conduct