Vouchgate

Screen the counterparty before you pay.

Autonomous agents hire and pay agents they've never met — instantly, irreversibly, with no one checking who's on the other side. Vouchgate is that check: one call returns a signed PASS / FLAG / BLOCK verdict before money moves.

Live on OKX.AI → Verify a verdict Terms

What you get

PASS

No implemented check matched, against point-in-time public data.

FLAG

Elevated risk — e.g. a known mixer contract, or a fresh wallet with no track record.

BLOCK

Hard signal — e.g. a sanctioned address on the OFAC SDN list.

Every verdict is ed25519-signed and reproducible — verify it yourself against the published key at /signing-key. Read-only and non-custodial: Vouchgate never holds keys, moves funds, or sits in a settlement path.

One call, before the money moves

POST https://mcp.vouchgate.xyz/mcp        (MCP tool: screen_counterparty)

{ "address": "0x…  wallet or OKX.AI agent ID" }

→ {
    "verdict": "BLOCK",
    "riskScore": 100,
    "reasons": [
      "address matches a sanctions-adjacent list entry (OFAC SDN snapshot)",
      "on-chain activity found (ethereum: nonce 2, holds balance)"
    ],
    "evidenceHash": "…", "signature": "…"
  }

Billed per call via x402 (OKX Agent Payments Protocol) — $0.01, settled on X Layer.

Real, on-chain usage

LiveListed on OKX.AI · Agent 4338

7Paid calls · 3 addresses · 3 days

x402Settled on X Layer mainnet

Every payment is verifiable on the X Layer explorer. These are per-call payments from distinct third-party addresses — real usage, not a claim.

How the screening works

Sanctions screening — the full set of EVM-format addresses currently on the U.S. OFAC SDN list (point-in-time snapshot, source & date stated in every response).
Known high-risk contracts — flags whether the target itself is a known privacy-mixer / anonymizing protocol (e.g. the Tornado Cash pools — OFAC-delisted in 2025 but still documented mixer infrastructure, each address verified on-chain). Returned as an elevated-risk FLAG, explicitly not a sanctions call.
Live wallet activity — real chain reads across six chains (X Layer, Ethereum, BSC, Base, Polygon, Arbitrum): age, transaction history, contract code. A counterparty with no track record on any major chain is flagged.
Deterministic & signed — the same target and data snapshot always produce the same signed verdict, so results are reproducible and auditable.
On the roadmap — funding-graph one-hop / counterparty proximity, agent track-record replay, sybil detection, and a confidential arbitration evaluator. Unimplemented checks are labelled as such in every verdict, never faked.

Why it compounds

Every screening call is a labelled signal about a counterparty. The intended moat is a privacy-preserving risk knowledge base: what Vouchgate learns about an address is derived from public on-chain data and accrues over time, while who asked stays private — caller identity is hashed and never linked to a screened target. More usage sharpens the signal without ever selling out the querier. That data network effect — not any single check — is the long-term defensibility.