# Nomos Wallet Watchlist Risk Screening

> Nomos Wallet Watchlist Risk Screening is a paid API for AI agents from base-agent-preflight.bytoken2023.workers.dev, paid per call via x402, $0.02/call, status unknown (last checked 2026-09-14).

Screens a blockchain wallet address for risk flags, risk score, and risk level across Ethereum, Tron, or Bitcoin networks

## Facts

- Endpoint: POST https://base-agent-preflight.bytoken2023.workers.dev/x402/v1/wallet/watchlist
- Price: $0.02/call
- Payment: x402
- Status: unknown
- Last checked: 2026-09-14
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/nomos-wallet-watchlist-risk-screening-68968987
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_rHtQT5i_4u6QeH0drFGua

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 nomos-wallet-watchlist-risk-screening-68968987 -d '<json body>'
```

Example prompt: Before I send that USDC payment, can you run a risk check on the Ethereum address 0xAbC123...def456 and tell me if it has any watchlist flags or a high risk score?

## When to prefer this

Use this endpoint when an autonomous agent needs a fast, pay-per-request risk verdict on a specific wallet address before executing a transaction, onboarding a counterparty, or routing funds — especially when you need structured risk_level and flags rather than raw on-chain data. Prefer this over general blockchain explorers when you need a pre-packaged compliance signal rather than raw transaction history, and over heavyweight KYC pipelines when you need lightweight, agent-native preflight screening across Ethereum, Tron, or Bitcoin without a subscription.

## Known failure modes

- Invalid or malformed wallet address returns a validation error
- Unsupported chain value (not ethereum/tron/bitcoin) returns a 400 bad request
- Address not found on-chain may return empty flags with risk_level 'unknown'
- Payment failure (x402 USDC not provided or insufficient) returns 402 Payment Required
- Network timeout from upstream blockchain data providers returns 503

## How this service works

Machine-payable service intelligence for discovering, verifying, and monitoring identity, risk, authorization, execution-preflight, and evidence APIs before autonomous agents spend.

## Output

Returns a JSON object containing the network identifier (e.g. eip155:8453), product name, and an assessment object with risk_level (e.g. 'low', 'medium', 'high'), a numeric risk_score, and an array of flags describing specific risk categories triggered. Also includes identity, activity, and provenance objects when available.

## 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": [
      "POST"
     ],
     "type": "string"
    },
    "queryParams": {
     "type": "object",
     "required": [
      "chain",
      "address"
     ],
     "properties": {
      "chain": {
       "enum": [
        "ethereum",
        "tron",
        "bitcoin"
       ],
       "type": "string"
      },
      "address": {
       "type": "string",
       "maxLength": 120,
       "minLength": 26
      },
      "idempotency_key": {
       "type": "string",
       "maxLength": 128
      }
     }
    }
   },
   "additionalProperties": false
  },
  "output": {
   "type": "object",
   "required": [
    "type"
   ],
   "properties": {
    "type": {
     "type": "string"
    },
    "example": {
     "type": "object",
     "properties": {
      "network": {
       "type": "string"
      },
      "product": {
       "type": "string"
      },
      "activity": {
       "type": "object"
      },
      "identity": {
       "type": "object"
      },
      "assessment": {
       "type": "object"
      },
      "provenance": {
       "type": "object"
      }
     }
    }
   }
  }
 }
}
```

## Response schema (JSON Schema)

```json
{
 "type": "json",
 "example": {
  "network": "eip155:8453",
  "product": "nomos-wallet-watchlist",
  "assessment": {
   "flags": [],
   "risk_level": "low",
   "risk_score": 0
  }
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/nomos-wallet-watchlist-risk-screening-68968987/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from base-agent-preflight.bytoken2023.workers.dev](https://www.zero.xyz/host/base-agent-preflight.bytoken2023.workers.dev/llms.txt)