Live demo · Arc testnet
The buyer agent calls a paid resource, gets a 402, signs an EIP-3009 authorization, and the facilitator settles it on Arc. Every message is shown exactly as it moves on the wire.
Seller agent · services
Preview mode: the 402 and signature are real; on-chain settlement is skipped until Arc keys are set.
Exchange trace
idle
Pick a service and run the payment. The full 402 → sign → settle → 200 handshake will appear here, message by message.