Vouch

Vouch is a counterparty check for AI agents that pay, with a bond behind every answer. People and agents ask AI whether an account is safe to pay, and the AI loses nothing when it's wrong.

Before an agent sends funds or calls a contract, it asks Vouch about the receiver and gets allow, warn or block, with reasons read from the chain. An agent posts its call on a NEAR account and locks a bond behind it in a NEAR contract. For 24 hours anyone can challenge the call with evidence. An AI judge, whose model runs in a TEE through NEAR AI Cloud, rules while the contract waits, and the proof is stored with the ruling's transaction. The loser can appeal to three staked jurors drawn at random (the demo jurors are labelled bots). If the call is overturned, the challenger takes the bond.

The paying agent signs with a function-call key that can only reach its own wallet contract, and that contract checks Vouch before it pays, so the agent can't skip the check. In the attack demo, a real model is told by invoices to pay a new account and a reported one. Vouch stops both, and attackers receive 0.00 NEAR.

It runs on NEAR testnet. Anyone can re-check a ruling from the chain with pnpm verify:ruling, and the README's trust model lists its limits.