Coinbase x402
used in
1
stack
HTTP 402 payment protocol for agent-to-agent and agent-to-API micropayments.
Standardized HTTP 402 challenge/response flow so agents can pay APIs in stablecoins on-the-fly. Common in agent-marketplace and pay-per-call API stacks.
Strengths
- Open protocol over HTTP
- Sub-cent settlement via stablecoins
- Backed by Coinbase + open community
Tradeoffs
- Crypto rails add operational and compliance complexity