Stillos Kya MCP Server

stillos-kya — Know Your Agent

The trust toll for agent-to-agent commerce. Before your AI agent pays another agent, run one check: is the counterparty sanctioned? Is its wallet a scam/contract/drained? StillOS returns a fail-closed CLEAR / REVIEW / BLOCK verdict — OFAC SDN screen + live on-chain wallet signals — with an Ed25519-signed receipt you can attach to the transaction as proof-of-diligence.

a16z (Big Ideas 2026) calls "Know Your Agent" — signed agent credentials + counterparty trust — the prerequisite for merchants to let agents onto payment rails. This is a working drop-in for it.

Install

npm install stillos-kya

Use — one call

const { kya } = require('stillos-kya');

const r = await kya({ name: 'Acme Agent', wallet: '0xabc...' });
if (!r.allowed) throw new Error(`counterparty ${r.verdict}`); // CLEAR | REVIEW | BLOCK
// r.receipt -> { hash, signature, verify }  (signed, verifiable proof-of-screening)

Use — gate an x402 / express route in one line

const { kyaGate } = require('stillos-kya');

// Every payment through this route runs a counterparty trust-check first.
app.post('/pay-agent', kyaGate({ blockOnReview: false }), async (req, res) => {
  // req.kya = { verdict, allowed, checks, receipt, ... }
  // ...proceed to pay; blocked counterparties never reach here
});

Tiers

• Free: unsigned verdict — the answer, for triage.
• Paid (x402 / API key): the signed, independently-verifiable receipt — the proof-of-diligence that matters in a dispute. Pass xPayment or apiKey in opts.

Pricing + full endpoint reference: https://nolawealthfinancial.com/notary

Why signed matters

An unsigned "looks fine" is worthless if a counterparty later turns out sanctioned or fraudulent. A StillOS signed receipt is cryptographic proof that you screened before you paid — the audit artifact that protects you.