x402 · pay-per-request compliance API

KYA/KYT screening, priced per request for AI agents

Query BlockSec address labels and Phalcon Compliance risk screening through the x402 protocol — pay per call in USDC. No API key, no account.

agent · deep screeningDemo only
{ "code": 0, "msg": "Success", "data": {  "riskLevelDescription": "critical",  "label": "Inferno Drainer: Approvals",  "systemTags": ["EXPLOIT", "SCAM"],  "riskProfile": { … }, "alerts": [ … ] # 5 unresolved} }

Per-request pricing, paid in USDC

USDC on Base · per request · no subscription

Label Query

$0.10/ request

Address labels and entity attribution from BlockSec / MetaSleuth intelligence.

Light Screening

$0.20/ request

A fast risk signal for a single address — sanctions and blacklist exposure at a glance.

Deep Screening

$1.00/ request

A full KYA/KYT risk report with multi-hop, cross-chain tracing and FATF-aligned analysis.

How x402 payment works

1

Request without a key

Call any endpoint directly. There is no API key and no account — the server responds with an HTTP 402 Payment Required quote for that request.

2

Pay per request in USDC

Your agent signs a gasless EIP-3009 authorization and retries with an X-PAYMENT header — a USDC micropayment on Base for exactly that one call.

3

Get JSON back

Once payment is verified, the endpoint returns the labels or risk report as JSON. A free discovery endpoint lists every endpoint and its price up front.

What you can screen

Address Labels

MetaSleuth

Entity attribution and address labels — exchanges, mixers, sanctioned entities, and known actors.

Light Screening

MetaSleuth

A fast risk verdict for a single address: sanctions and blacklist exposure with a risk score.

Deep Screening

Phalcon Compliance

A full KYA/KYT report with multi-hop, cross-chain fund tracing and FATF-aligned risk analysis.

Coverage

One API, every major chain

Screen addresses across 9 networks — Ethereum, Bitcoin, Tron, and the major EVM L2s — through a single endpoint, with no per-chain integration to maintain.

BlockSec
Ethereum
Tron
BNB Chain
Base
Polygon
Arbitrum
Optimism
Avalanche
Bitcoin

Agent-native compliance, explained

KYA and KYT for agents

KYA (Know Your Address) evaluates a single address — its labels, sanctions status, and risk. KYT (Know Your Transaction) follows the flow of funds across hops and chains.

Agent-native compliance needs both, including multi-hop, cross-chain, and FATF-aligned analysis.

Why per-request payments fit AI agents

Autonomous agents can’t manage API keys or sign up for subscriptions. x402 lets an agent pay for exactly the checks it makes, in-flow, with a signed USDC micropayment.

See Build KYA/KYT with x402 for the full walkthrough.

Built for autonomous workflows

Submit paid requests directly from agents, backends, or scripts using x402-fetch or viem — no human in the loop.

The same rails power the Web3 Companion agentic wallet.

Frequently Asked Questions

Further reading on agent-native compliance

Crypto Compliance for AI Agents: Build KYA/KYT with x402

How x402 lets AI agents run KYA/KYT compliance checks via per-request crypto payments — no API keys, no subscriptions.

Read research

Web3 Companion: The Open-Source Secure Agentic Wallet

The open-source agentic wallet that shows how autonomous crypto workflows stay safe on the same rails.

Read research

Crypto Payment Security & Compliance Checklist

The controls to confirm before moving crypto — a practical checklist for payment security and compliance.

Read research

x402 Compliance API — live endpoints

Open the pay-per-request API: address labels, light screening, and deep KYA/KYT screening across 9 chains.

Open the API

Start screening from your agent today

Run KYA/KYT address screening directly from your agents, backends, or scripts — pay per request in USDC, with no API key and no account.