# Tanod txpeek Address Pre-Transaction Risk Check

> Tanod txpeek Address Pre-Transaction Risk Check is a paid API for AI agents from tanod.dev, paid per call via x402, $0.005/call, status unknown (last checked 2026-10-10).

Returns a heuristic risk verdict for a smart contract or wallet address on Base or Ethereum, covering proxy/admin control, verification status, risky functions, and token basics.

## Facts

- Endpoint: POST https://tanod.dev/v1/check/address?utm_source=zero.xyz
- Price: $0.005/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-10
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/tanod-txpeek-address-pre-transaction-risk-check-f18eb1d2
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_CUPJLa-FktgOrJAkq4EvR

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 tanod-txpeek-address-pre-transaction-risk-check-f18eb1d2 -d '<json body>'
```

Example prompt: Before I swap tokens, can you do a quick txpeek risk check on the Base contract 0x833589fcd6edb6e08f4c7c32d4f71b54bda02913 and tell me if it's high risk?

## When to prefer this

Use this endpoint when an AI agent or developer needs a fast (~1 second), cheap ($0.005), heuristic pre-flight risk check on a specific contract or wallet address on Base or Ethereum before initiating a transaction or approval. It is not a full audit, but it surfaces critical signals (proxy upgradeability, admin EOA control, risky functions, verification) that a human or agent should weigh before committing funds.

## Known failure modes

- Invalid address format (not 0x + 40 hex chars) returns a validation error
- Unsupported chain value returns an enum validation error
- Address not found on the specified chain may return empty reasons or an error
- Service timeout if on-chain data is slow to fetch (typical ~1.2s but may exceed)
- Payment failure (x402 micropayment not accepted) blocks the call

## How this service works

One MCP server and HTTP API with 193 pay-per-call tools for AI agents (security checks, chain data, finance, aviation, documents), plus free uptime and MikroTik monitoring and 130+ free browser tools. No signup; free daily tier. Operated by an AI.

## Output

A JSON object containing: a boolean 'ok', the chain and address echoed back, a schema version, an array of 'reasons' each with a code, points, message, and severity (e.g. 'high'), an overall 'verdict' string, a 'risk_score' integer (0-100), the 'checked_at_block' number, latency in milliseconds, and a disclaimer noting it is heuristic only.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "properties": {
  "chain": {
   "enum": [
    "base",
    "ethereum"
   ],
   "type": "string",
   "description": "Chain of the address."
  },
  "address": {
   "type": "string",
   "pattern": "^0x[0-9a-fA-F]{40}$",
   "description": "Address you are about to interact with."
  }
 }
}
```

## Response schema (JSON Schema)

```json
{
 "type": "json",
 "example": {
  "ok": true,
  "chain": "base",
  "schema": "precheck/1",
  "address": "0x833589fcd6edb6e08f4c7c32d4f71b54bda02913",
  "reasons": [
   {
    "code": "upgradeable_single_key",
    "points": 35,
    "message": "Upgradeable by a single key: the admin 0x... is an EOA and can change this contract's code at any time.",
    "severity": "high"
   }
  ],
  "verdict": "high",
  "disclaimer": "Heuristic pre-check, not an audit. A low score does not guarantee safety.",
  "latency_ms": 1200,
  "risk_score": 65,
  "checked_at_block": 36000000
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/tanod-txpeek-address-pre-transaction-risk-check-f18eb1d2/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from tanod.dev](https://www.zero.xyz/host/tanod.dev/llms.txt)