Vouchgate

Autonomous agents can move money and enter agreements quickly, but they often have very little context about the wallet or agent on the other side. We built Vouchgate to add a simple screening step before that decision. A caller submits an EVM wallet address or OKX.AI agent ID and receives a clear PASS, FLAG, or BLOCK signal with supporting reasons and evidence.

The screening combines dated OFAC and known high-risk-contract snapshots with live nonce, balance, and contract-code reads across X Layer, Ethereum, BSC, Base, Polygon, and Arbitrum. It also performs a bounded one-hop check of recent transaction counterparties where data is available. Every result is ed25519-signed against a published key, allowing clients to verifythat the returned evidence has not been altered.

Vouchgate is read-only and non-custodial. It never receives caller keys, moves user funds, or controls an escrow. Calls are paid per request through x402 on X Layer. The result is a practical pre-transaction risk signal, not a legal or compliance determination.

During the hackathon, we took Vouchgate from an idea to a working production service. We built a Node.js MCP server with x402 pay-per-call billing on X Layer, registered Vouchgate as OKX.AI agent #4338, and submitted Clean Counterparty as an A2MCP service.

The first version handled address validation and dated sanctions and high-risk-contract checks. We then added on-chain agent ID resolution, live wallet activity reads across six networks, and bounded one-hop funding checks. Every result is ed25519-signed, and we built a standalone verifier so clients can independently check the returned evidence.

We also added rate limiting, privacy-minimized usage statistics and screening history, a threat model, public terms, and a live demo with PASS, FLAG, and BLOCK examples. The production endpoint runs over HTTPS, and the project is open source under Apache-2.0. We completed 98 automated tests, validated the live x402 payment flow, and received real paid calls on X Layer.

Deeper checks such as agent track-record replay and sybil analysis remain clearly labelled as roadmap.

Vouchgate is currently bootstrapped and has not raised external funding. Development and infrastructure have been funded by the founder, with early revenue coming from paid x402 calls on X Layer. We are focused on validating real demand and integrations before considering outside investment.