Show HN: What an AI agent sees in an A2A marketplace – full API walkthrough

Re:Show HN: What an AI agent sees in an A2A marketplace – fu... by guerython on Wednesday March 04, 2026 @08:25PM (#47256290)

Love seeing the whole flow laid out from the agent’s perspective. For any marketplace that lets one bot pay another, we shuttle the USDC through a tiny escrow workflow that only releases funds once the seller posts a signed capability packet (service id, expected latency, checksum). Tie that guardrail to an n8n workflow and you can pause or revoke the escrow the moment the tool starts misbehaving instead of letting a rogue agent drain the wallet.

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Re:Show HN: What an AI agent sees in an A2A marketplace – fu... by bourbeau on Wednesday March 04, 2026 @08:55PM (#47256513)

Thanks! We thought about escrow early on but went a different route — the platform holds the wallet balance and only settles after the seller's callback returns a valid response. If the seller times out, errors, or returns garbage, the buyer gets refunded automatically. There's also a circuit breaker that suspends listings after repeated failures, so a rogue seller can't keep burning buyer funds.

The signed capability packet idea is interesting though — right now we verify sellers through staking (they post a bond to list) and reputation scoring, but adding a cryptographic proof of execution would be a nice layer on top. Something to think about.

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