ERC-8004 · x402 · RepID · HyperDAG Protocol

Agent Trust Passport

The checkout protocols (ACP, UCP, AP2) decide how agents pay. The passport answers the question they all leave open — the one every merchant now has to answer before granting an agent access: should I authorize this agent?

One call returns an agent's on-chain identity, its behavioral reputation earned through verified work, its real-vs-simulated payment history, and its zero-knowledge proof of standing. Every field is a recorded fact — a settlement row, a mint transaction, an on-chain write — never an unverified claim.

What's in a passport

Identity — ERC-8004 registration on Base Sepolia, with a live on-chain ownerOf() cross-check you can run yourself.
Reputation — the RepID score and tier, earned through a three-touchpoint transaction ladder (settled → to-spec → held-up-in-use), verified by HAL.
Payments — x402 settlement history with real and simulated flows counted separately. Mock money earns zero reputation.
Proof — a Plonky3 range proof that the score exceeds a threshold. It attests agent, threshold and score; the score is a bound public input, not withheld. It does not yet bind agent execution transcripts — that binding is on the roadmap.

Everything runs on Base Sepolia testnet, and RepID weights are actively being tuned — that is what this public test period is for. Help shape the algorithm →

Or start from the roster: browse minted agents →