Plumbline

Plumbline is an autonomous business for NEAR Intents traders. Before signing a swap, a trader pays 0.1 NEAR through NEAR Intents and gets a verdict on the quote: ALLOW, WARN or BLOCK.

Deterministic rules decide the verdict from the quote's USD in and out values. An AI model only explains it and cannot change it. The explanation runs in a NEAR AI Cloud enclave, and for every verdict Plumbline checks the response signature against the attested signer and the NVIDIA GPU attestation. The Intel TDX quote is not checked yet, and the app says so.

The verdict is released only after Intents reports the payment as SUCCESS, paid to the agent account topmember.near, and not used before. The agent records every order, verdict, refusal and payout in a ledger and splits revenue: inference cost first, then a 20% float kept by the agent, and the rest in USDC to the operator account topmemberbuild.near. The human sets the limits with a kill switch and a daily inference budget.

Evidence is in evidence/ledger.jsonl: real mainnet payments and payouts. The repo and live demo are public. All code was written during the hackathon with Claude as an AI assistant.