# Address Fingerprint

> Address Fingerprint is a paid API for AI agents from k2so.wrong.systems, paid per call via x402, $0.02/call, status unknown (last checked 2026-09-15).

Returns a risk score, activity summary, and evidence for a Base blockchain address, including balance, transaction activity, and contract status checks.

## Facts

- Endpoint: GET https://k2so.wrong.systems/api/services/address-fingerprint
- Price: $0.02/call
- Payment: x402
- Status: unknown
- Last checked: 2026-09-15
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/address-fingerprint-5ec2f903
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap__74lrXfWkzioJCZvdih1_

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 address-fingerprint-5ec2f903
```

Example prompt: Before I send funds, can you fingerprint the Base address 0xAbC123... and give me its risk score, a summary of its on-chain activity, and flag any risk factors I should know about?

## When to prefer this

Choose this endpoint when you need a quick, structured risk profile of a Base blockchain address before executing a payment, onboarding a user, or interacting with an unknown counterparty. It is particularly useful for x402 payment agents that need to pre-screen recipient addresses. Prefer this over generic blockchain explorers when you need a scored, agent-consumable output rather than raw transaction data.

## Known failure modes

- Missing or invalid 'address' query parameter returns an error response
- Non-Base or malformed address strings may return low-confidence or error results
- Payment failure or insufficient USDC balance blocks access to paid response
- Rate limiting or upstream Base RPC unavailability may cause timeouts
- Newly created addresses with no history may return minimal evidence and low confidence scores

## How this service works

Address Fingerprint: agent-usable x402 brief at 0.02 USDC on Base. Base address balance/activity/contract check.

## Output

Returns a JSON object containing: a boolean success flag, a numeric risk score, a human-readable summary, a confidence string (e.g. 'high'/'medium'/'low'), an evidence object with supporting on-chain data, an array of strengths, an array of risk factors, and an ISO-8601 generatedAt timestamp. Also includes payment metadata indicating transaction details.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "$schema": "https://json-schema.org/draft/2020-12/schema",
 "required": [
  "input"
 ],
 "properties": {
  "input": {
   "type": "object",
   "required": [
    "type",
    "method"
   ],
   "properties": {
    "type": {
     "type": "string",
     "const": "http"
    },
    "method": {
     "enum": [
      "GET",
      "HEAD",
      "DELETE"
     ],
     "type": "string"
    },
    "queryParams": {
     "type": "object",
     "properties": {
      "meta": {
       "enum": [
        "0",
        "1"
       ],
       "type": "string",
       "description": "Set to 1 for free metadata JSON (no payment required)"
      },
      "address": {
       "type": "string",
       "description": "Composite input parameter"
      }
     }
    }
   },
   "additionalProperties": false
  },
  "output": {
   "type": "object",
   "required": [
    "type"
   ],
   "properties": {
    "type": {
     "type": "string"
    },
    "example": {
     "type": "object",
     "title": "Address Fingerprint paid response",
     "$schema": "https://json-schema.org/draft/2020-12/schema",
     "required": [
      "ok",
      "paid",
      "service",
      "provider",
      "result"
     ],
     "properties": {
      "ok": {
       "type": "boolean"
      },
      "paid": {
       "type": "boolean"
      },
      "result": {
       "type": "object",
       "required": [
        "ok",
        "service"
       ],
       "properties": {
        "ok": {
         "type": "boolean",
         "description": "Handler success"
        },
        "score": {
         "type": "number"
        },
        "service": {
         "type": "string",
         "description": "Service slug"
        },
        "summary": {
         "type": "string"
        },
        "evidence": {
         "type": "object"
        },
        "strengths": {
         "type": "array",
         "items": {
          "type": "string"
         }
        },
        "confidence": {
         "type": "string"
        },
        "generatedAt": {
         "type": "string",
         "description": "ISO-8601 timestamp"
        },
        "riskFactors": {
         "type": "array",
         "items": {
          "type": "string"
         }
        }
       }
      },
      "payment": {
       "type": "object",
       "properties": {
        "code": {
         "type": "string"
        },
        "payer": {
         "type": "string"
        },
        "detail": {
         "type": "string"
        },
        "selfPay": {
        
… (truncated)
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/address-fingerprint-5ec2f903/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from k2so.wrong.systems](https://www.zero.xyz/host/k2so.wrong.systems/llms.txt)