# x402intel Seller Attribution Intelligence

> x402intel Seller Attribution Intelligence is a paid API for AI agents from api.x402intel.uk, paid per call via x402, $0.05/call, status unknown (last checked 2026-10-02).

Returns attribution analysis for an x402 payTo address, comparing reported API calls to catalog-attributed on-chain USDC flows with payer concentration and forensic signals.

## Facts

- Endpoint: GET https://api.x402intel.uk/x402-authenticity/:payTo?utm_source=zero.xyz
- Price: $0.05/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-02
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/x402intel-seller-attribution-intelligence-c3193282
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_xX5BqFGQr2swSpdKO-kX9

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 x402intel-seller-attribution-intelligence-c3193282
```

Example prompt: Pull the x402 attribution intelligence report for payTo address 0x4a3b...c9d2 — I want to see whether their reported API calls line up with actual on-chain USDC flow, any payer concentration flags, and the forensic signals.

## When to prefer this

Use this endpoint when you need to cross-reference an x402 seller's self-reported API usage against verifiable on-chain USDC flows for a specific payTo address. Prefer this over generic blockchain explorers when you want pre-computed concentration metrics and forensic signals specific to the x402 marketplace ecosystem.

## Known failure modes

- Unknown payTo address returns empty or null attribution data
- Addresses with no on-chain USDC activity return zero-flow reports with limited forensic signals
- Rate limiting or payment failure returns 402 or 429 error
- Malformed wallet address format triggers a 400 validation error
- Newly registered sellers may have insufficient history for meaningful attribution

## How this service works

x402 seller attribution intelligence: reported calls versus catalog-attributed on-chain USDC flow, payer-address concentration and forensic signals. Attribution is not protocol or fraud proof.

## Output

Returns a structured report for the given payTo address including: ratio of reported API calls to catalog-attributed on-chain USDC flow, payer address concentration metrics, forensic anomaly signals, and an overall attribution quality assessment. Note: attribution is not protocol-enforced or fraud-proof.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "$schema": "https://json-schema.org/draft/2020-12/schema",
 "required": [
  "input"
 ],
 "properties": {
  "input": {
   "type": "object",
   "required": [
    "type",
    "method"
   ],
   "properties": {
    "type": {
     "type": "string",
     "const": "http"
    },
    "method": {
     "enum": [
      "GET"
     ],
     "type": "string"
    },
    "pathParams": {
     "type": "object",
     "required": [
      "payTo"
     ],
     "properties": {
      "payTo": {
       "type": "string",
       "pattern": "^0x[0-9a-fA-F]{40}$"
      }
     },
     "additionalProperties": false
    },
    "queryParams": {
     "type": "object",
     "properties": {},
     "additionalProperties": false
    }
   },
   "additionalProperties": false
  },
  "output": {
   "type": "object",
   "required": [
    "type"
   ],
   "properties": {
    "type": {
     "type": "string"
    },
    "example": {
     "type": "object",
     "properties": {},
     "additionalProperties": true
    }
   }
  }
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/x402intel-seller-attribution-intelligence-c3193282/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from api.x402intel.uk](https://www.zero.xyz/host/api.x402intel.uk/llms.txt)