Requests a new specification for payment channels to be added to the x402 protocol, as it currently only supports one-time payments. This would enable repeated micropayments with lower fees and faster settlement, crucial for streaming payments and metered API access on Stellar.
### What problem does your feature solve? The x402 protocol currently supports one-time payments but lacks a specification for payment channels. Payment channels enable repeated micropayments with lower fees and faster settlement, which is critical for streaming payments and metered API access on Stellar. ### What would you like to see? A new specification added to `coinbase/x402` that defines the payment channel scheme, including: - Channel open/close lifecycle - Off-chain payment updates and state management - On-chain settlement - Integration points with the existing x402 HTTP 402 flow - Support for the facilitator to be the server's proxy to managing the channel lifecycle - Stellar-specific considerations (e.g., Soroban smart contracts, channel accounts, authorization) ### What alternatives are there? Rely solely on one-time payments, but this limits use cases that require high-frequency micropayments.