Show HN: Larkin – Authorization middleware for x402 agent payments

Category: security

Tags: authorization, middleware, x402, ai-agents, trust-scoring

Score: 6.0/10 (Innovation: 6, Technical: 6, Documentation: 7, Utility: 5)

Larkin provides authorization middleware for the x402 agent payment protocol, enabling trust scoring of wallets paying AI agents via APIs. It offers three modes (block, warn, surcharge) and cryptographically signed receipts that remain verifiable independently of the service, addressing the gap between payment and authorization in machine-to-machine transactions.

Target audience: backend devs

Repository: https://larkin.sh · TypeScript · MIT

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