# ChainAnalyzer Pre-Sign Risk Check

> ChainAnalyzer Pre-Sign Risk Check is a paid API for AI agents from chain-analyzer.com, paid per call via x402, $0.1/call, status unknown (last checked 2026-10-11).

Returns a fast risk verdict for a blockchain destination address or spender before a transaction or approval is signed, using registry and ScamDB lookups plus an optional spender code check.

## Facts

- Endpoint: GET https://chain-analyzer.com/api/v1/x402/presign/check?utm_source=zero.xyz
- Price: $0.1/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-11
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/chainanalyzer-pre-sign-risk-check-06c099a9
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_D10vlT5Z-76Kgm0moG9z8

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 chainanalyzer-pre-sign-risk-check-06c099a9
```

Example prompt: Before I send funds, can you do a quick ChainAnalyzer pre-sign check on 0xABC123... on Ethereum to see if it's flagged as risky or a scam?

## When to prefer this

Choose this endpoint when you need a near-instant, low-cost risk verdict immediately before signing a transaction or token approval — especially when a full deep-scan AML report is overkill and latency matters. Ideal for real-time agent workflows that must gate every outbound payment or DeFi approval with a quick scam and AML check.

## Known failure modes

- Invalid or malformed address format returns an error
- Unsupported chain identifier results in an error response
- RPC call for spender code check occasionally times out, potentially delaying response
- Payment not received or insufficient USDC results in 402 Payment Required
- Address not found in any registry returns a clean/unknown verdict rather than a confirmed safe verdict

## How this service works

Sign-time risk verdict for a destination or spender before value moves. Registry + ScamDB lookups plus at most one RPC call (approve spender code check), so it answers in milliseconds instead of running a full scan. Same verdict as the subscription REST API.

## Output

A fast risk verdict indicating whether the destination or spender address is flagged, including scam database hits, registry match results, and for spender addresses a code check result indicating if the contract is malicious — all returned in milliseconds.

## Request schema (JSON Schema)

```json
{
 "properties": {
  "input": {
   "properties": {
    "queryParams": {
     "type": "object",
     "properties": {
      "to": {
       "type": "string"
      },
      "chain": {
       "type": "string"
      }
     }
    }
   }
  },
  "output": {
   "properties": {
    "example": {}
   }
  }
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/chainanalyzer-pre-sign-risk-check-06c099a9/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from chain-analyzer.com](https://www.zero.xyz/host/chain-analyzer.com/llms.txt)