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PayPhone
An AI agent that bills video calls by the second and settles on-chain at hangup.
Overview
Built at EasyA Consensus Miami 2026. The agent signs one Permit2 witness capped at $5, and the chain settles $0.01 per active second when the call ends. Settlement runs through a hand-rolled x402 verify-to-settle handshake rather than CDP's paymentMiddleware, so nothing settles until the hangup webhook fires. AWS infrastructure is provisioned as a single Terraform apply.
Key Achievements
6 settlements ran on-chain, 2 of them on Base mainnet
Hand-rolled the x402 verify-to-settle handshake so settlement defers to the hangup webhook
Provisioned Cognito, DynamoDB, and scoped IAM through one Terraform apply
Tech Stack
Next.jsTypeScriptAWSTerraformCoinbase CDPx402Permit2Anthropic APICognitoDynamoDBBase