# x402 Buyer Behavior Classification

> x402 Buyer Behavior Classification is a paid API for AI agents from k2so-8080.on.ascii.dev, paid per call via x402, $0.002/call, status unknown (last checked 2026-10-23).

Deterministically classifies an x402 buyer wallet as organic, suspected wash, self-test, or developer based on payment history and behavioral signals

## Facts

- Endpoint: GET https://k2so-8080.on.ascii.dev/api/services/x402-buyer-behavior-classification-organic-wash?utm_source=zero.xyz
- Price: $0.002/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-23
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/x402-buyer-behavior-classification-f38189ac
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_Un7N15FRrlkSIaHWFzBy4

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 x402-buyer-behavior-classification-f38189ac
```

Example prompt: Can you classify the x402 buyer wallet 0xABC123 as organic, suspected wash, self-test, or developer — I need the confidence score and the decision rule that was used?

## When to prefer this

Use this endpoint when you need per-buyer behavioral classification on the x402 network — specifically to distinguish organic buyers from wash traders, developers, or self-testers at the wallet level. Prefer this over ledger-level wash detection when you need a per-buyer label with confidence scores and traceable decision rules rather than aggregate ledger analysis.

## Known failure modes

- Missing or invalid buyer wallet address returns an error
- Insufficient payment history may result in low confidence score
- Self-pay loop detection may produce false positives for legitimate test wallets
- Endpoint returns metadata JSON for free when ?meta=1 is set, not the paid classification result
- Payment not received results in 402 response requiring x402 payment flow

## How this service works

Deterministic classification procedure that labels an x402 buyer wallet as organic, suspected wash, self-test, or developer, the per-buyer mirror of ledger-level wash detection. Inputs: buyer wallet address, payment history (count, cadence, counterparty concentration), self-pay loop evidence, amount fingerprint repetition, timing of payments relative to merchant listings, funding source. Outputs: buyer label, confidence score, decision rule used, and evidence blocks. Thresholds: self-pay loops

## Output

Returns a buyer label (organic, suspected wash, self-test, or developer), a confidence score, the specific decision rule applied, and structured evidence blocks supporting the classification. Also includes a prose brief suitable for agent consumption and metadata about the generation source (deterministic/llm/reasoning).

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "$schema": "https://json-schema.org/draft/2020-12/schema",
 "required": [
  "input"
 ],
 "properties": {
  "input": {
   "type": "object",
   "required": [
    "type",
    "method"
   ],
   "properties": {
    "type": {
     "type": "string",
     "const": "http"
    },
    "method": {
     "enum": [
      "GET",
      "HEAD",
      "DELETE"
     ],
     "type": "string"
    },
    "queryParams": {
     "type": "object",
     "properties": {
      "meta": {
       "enum": [
        "0",
        "1"
       ],
       "type": "string",
       "description": "Set to 1 for free metadata JSON (no payment required)"
      },
      "topic": {
       "type": "string",
       "description": "Optional topic override for the decision procedure"
      }
     }
    }
   },
   "additionalProperties": false
  },
  "output": {
   "type": "object",
   "required": [
    "type"
   ],
   "properties": {
    "type": {
     "type": "string"
    },
    "example": {
     "type": "object",
     "title": "x402 buyer behavior classification: organic, suspected wash, self-test, develope paid response",
     "$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"
        },
        "brief": {
         "type": "string",
         "description": "Decision procedure prose for agents"
        },
        "model": {
         "type": "string"
        },
        "topic": {
         "type": "string"
        },
        "service": {
         "type": "string",
         "description": "Service slug"
        },
        "procedure": {
         "type": "string"
        },
        "generatedAt": {
         "type": "string",
         "description": "ISO-8601 timestamp"
        },
        "generationSource": {
         "enum": [
          "llm",
          "reasoning",
          "deterministic"
         ],
         "type": "string"
        }
       }
      },
      "payment": {
       "type": "object",
       "properties": {
        "code": {
         "type": "string"
        },
        "payer": {
         "type": "string"
        },
        "detail": {
… (truncated)
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/x402-buyer-behavior-classification-f38189ac/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from k2so-8080.on.ascii.dev](https://www.zero.xyz/host/k2so-8080.on.ascii.dev/llms.txt)