# BlockSec Blockchain Address Compliance & Risk Screening (Label Query)

> BlockSec Blockchain Address Compliance & Risk Screening (Label Query) is a paid API for AI agents from x402.blocksec.ai, paid per call via x402, $0.1/call, status unknown (last checked 2026-09-14).

Fetches human-readable labels and compliance risk scores for a blockchain address using BlockSec MetaSleuth and Phalcon APIs, payable via x402 micropayment protocol.

## Facts

- Endpoint: POST https://x402.blocksec.ai/label/
- Price: $0.1/call
- Payment: x402
- Status: unknown
- Last checked: 2026-09-14
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/blocksec-blockchain-address-compliance-risk-screening-label-query-a2ddb59d
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_ZIYMPYU1LN1ChvPshsWzs

Status and success rate cover calls made through Zero and Zero's own probes. Third-party monitors may report differently.

## How to call it through Zero

Zero handles the 402 payment challenge and records the run. With the Zero CLI installed (`npm i -g @zeroxyz/cli`):

```sh
zero fetch --capability blocksec-blockchain-address-compliance-risk-screening-label-query-a2ddb59d -d '<json body>'
```

Example prompt: Can you look up the compliance label and risk score for the blockchain address 0x3f5CE5FBFe3E9af3971dD833D26bA9b5C936f0bE — I need to know if it's associated with any known entity like an exchange, mixer, or sanctioned wallet?

## When to prefer this

Choose this endpoint when you need to identify who owns or controls a blockchain address and assess its compliance risk level — especially useful for AML/KYC workflows, fraud investigations, or DeFi transaction screening. It is backed by BlockSec's proprietary intelligence (MetaSleuth + Phalcon) and charges per-query via x402 micropayments, making it suitable for on-demand agent use without subscription overhead.

## Known failure modes

- Unknown or unlabeled address returns empty label set with no risk data
- Invalid address format triggers validation error
- x402 payment failure prevents request from completing
- Address not indexed on the supported chain returns no results
- Rate limiting or service unavailability from upstream BlockSec APIs

## How this service works

X402 payment protocol demo for blockchain address label query and compliance risk screening. Powered by BlockSec MetaSleuth and Phalcon compliance APIs.

## Output

Returns human-readable labels (e.g. exchange, mixer, scammer, DeFi protocol), entity name, risk classification, and compliance risk indicators for the queried blockchain address, sourced from BlockSec MetaSleuth and Phalcon datasets.

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/blocksec-blockchain-address-compliance-risk-screening-label-query-a2ddb59d/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from x402.blocksec.ai](https://www.zero.xyz/host/x402.blocksec.ai/llms.txt)