# ChainVerdict Preflight Address Check API

> ChainVerdict Preflight Address Check API is a paid API for AI agents from chainverdict.xyz, paid per call via x402, $0.01/call, status unknown (last checked 2026-09-13).

Checks a blockchain payee address before sending funds to assess trustworthiness or risk

## Facts

- Endpoint: GET https://chainverdict.xyz/v1/preflight/%7Baddr%7D
- Price: $0.01/call
- Payment: x402
- Status: unknown
- Last checked: 2026-09-13
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/chainverdict-preflight-address-check-api-9aa0f30c
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_T1tYv0Q3IaVmhReWQrSkJ

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 chainverdict-preflight-address-check-api-9aa0f30c
```

Example prompt: Before I send funds, can you run a preflight check on the address 0x1234abcd5678efgh9012ijkl3456mnop7890qrst to see if ChainVerdict flags it as risky or trustworthy?

## When to prefer this

Use this endpoint when you need a quick, pay-per-call preflight risk check on a specific blockchain wallet address before executing a payment or transfer. It is ideal for agentic payment workflows that need to gate transactions behind an address reputation check without committing to a subscription. Prefer this over manual on-chain inspection when you need a structured, actionable verdict rather than raw transaction history.

## Known failure modes

- Invalid or malformed blockchain address returns an error response
- Unpaid request returns HTTP 402 with x402 payment requirements
- Address not found in database may return unknown/neutral verdict
- Network timeout if the chain analysis backend is slow
- Non-existent or zero address may return an error

## How this service works

x402 v2 pay-per-call. Unpaid requests receive HTTP 402 with payment requirements.

## Output

Returns a verdict or risk assessment for the given blockchain address, indicating whether the address is considered safe, suspicious, or flagged — helping the caller decide whether to proceed with a payment or transaction.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "$schema": "https://json-schema.org/draft/2020-12/schema",
 "required": [
  "input"
 ],
 "properties": {
  "input": {
   "type": "object",
   "required": [
    "type",
    "method"
   ],
   "properties": {
    "type": {
     "type": "string",
     "const": "http"
    },
    "method": {
     "enum": [
      "GET"
     ],
     "type": "string"
    },
    "pathParams": {
     "type": "object",
     "required": [
      "addr"
     ],
     "properties": {
      "addr": {
       "type": "string",
       "description": "Payee address to check before sending funds"
      }
     }
    },
    "queryParams": {
     "type": "object",
     "properties": {}
    }
   },
   "additionalProperties": false
  },
  "output": {
   "type": "object",
   "required": [
    "type"
   ],
   "properties": {
    "type": {
     "type": "string"
    },
    "example": {
     "type": "object",
     "additionalProperties": true
    }
   }
  }
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/chainverdict-preflight-address-check-api-9aa0f30c/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from chainverdict.xyz](https://www.zero.xyz/host/chainverdict.xyz/llms.txt)