> ## Documentation Index
> Fetch the complete documentation index at: https://docs.aegis-kyt.com/llms.txt
> Use this file to discover all available pages before exploring further.

# Introduction

> Pay-per-call AML labels & risk screening for AI agents — USDC on Base, no API keys.

**Aegis KYT** is an AML data service for AI agents.  Hit an endpoint
with no credentials, get a quote, sign a [x402](https://www.x402.org/)
payment authorization, retry — pay-per-call, settled on Base.

No accounts.  No KYC.  No API keys.

## Why x402

Most data APIs gate access behind subscriptions, key issuance, and
per-route rate limits — friction that AI agents can't navigate
autonomously.  x402 turns the [HTTP 402 status code](https://developer.mozilla.org/en-US/docs/Web/HTTP/Status/402)
into a stateless protocol:

1. Agent requests the resource.
2. Server replies `402` with a stablecoin quote (asset, amount, recipient, expiry).
3. Agent signs an [EIP-3009 transferAuthorization](https://eips.ethereum.org/EIPS/eip-3009) for the quoted USDC.
4. Agent retries with `X-PAYMENT: <base64 proof>`; server verifies, settles, and serves the resource.

Replay-protection, multi-chain, \$0 onboarding cost.  See
[Authentication](/authentication/x402) for the full flow.

## What we sell

Three paid tiers (all settled in USDC on Base):

| Tier                                        | Price      | Returns                                                                                                                       |
| ------------------------------------------- | ---------- | ----------------------------------------------------------------------------------------------------------------------------- |
| [Screen](/endpoints/screen)                 | **\$0.10** | All per-source labels we have for the address **plus** the Aegis consensus risk score + categories — one tier, one settlement |
| [Check Address](/endpoints/check-address)   | **\$1.00** | Aegis full 4-tier verdict — SDN + multi-source consensus + 1-hop inheritance + BFS exposure                                   |
| [Check Transfer](/endpoints/check-transfer) | **\$0.50** | Transaction Check (KYT) — decode a tx, run Tier 4 BFS per sender, apply the Aegis Standard policy, return PolicyAlerts        |

Plus two free probes:

* [GET /.well-known/x402.json](/endpoints/discovery) — service discovery (price LUT)
* [GET /health](/endpoints/health) — plain-text `ok`

## Powered by

* **44 ingest sources** continuously refreshed: OFAC SDN, Tether
  blacklist, GraphSense tagpacks, DefiLlama protocol catalog, Arkham
  deanon, hack-attribution databases, exchange Proof-of-Reserves, and more.
* **\~795,000 label claims** across 11 EVM + non-EVM chains.
* **Aegis 4-tier consensus**: SDN exact match → 17-source
  consensus → 1-hop inheritance from neighbours → BFS multi-hop
  exposure with per-category aggregation.

## Get started

<CardGroup cols={2}>
  <Card title="Quickstart" icon="bolt" href="/quickstart">
    Five minutes from `curl` to your first paid call.
  </Card>

  <Card title="Authentication" icon="lock" href="/authentication/x402">
    How x402 actually works on the wire.
  </Card>

  <Card title="Endpoints" icon="grip" href="/endpoints/screen">
    Per-tier reference with request/response schemas.
  </Card>

  <Card title="Networks & categories" icon="globe" href="/reference/networks">
    Supported chains, risk taxonomy, error codes.
  </Card>
</CardGroup>