# Agent Adoption Proof from x402 Payment Ledger

> Agent Adoption Proof from x402 Payment Ledger is a paid API for AI agents from k2so.wrong.systems, paid per call via x402, $0.002/call, status down (last checked 2026-09-15).

Returns a structured adoption verdict (proven/partial/unproven) for a service based on its x402 payment ledger, applying dedup rules, retention thresholds, and rail diversity checks.

## Facts

- Endpoint: GET https://k2so.wrong.systems/api/services/agent-adoption-proof-from-x402-payment-ledger
- Price: $0.002/call
- Payment: x402
- Status: down
- Last checked: 2026-09-15
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/agent-adoption-proof-from-x402-payment-ledger-ab4a292a
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_XjkyICzbLym_hqJTAxTab

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 agent-adoption-proof-from-x402-payment-ledger-ab4a292a
```

Example prompt: Can you check the x402 payment ledger for this service and tell me whether its adoption is proven, partial, or unproven — applying the unique-payer floor, repeat-purchase rate check, self-pay dedup, and rail diversity rules across the last 4-week claim window?

## When to prefer this

Use this endpoint when you need a structured, rule-based adoption verdict grounded in x402 on-chain payment data rather than self-reported metrics. Prefer it over generic analytics tools when the payment history is denominated in x402 settlements and you need dedup rules specific to agent-pay patterns (self-pay, same-wallet, bulk-buy detection). It is particularly valuable for marketplace listing gatekeeping, investor due diligence, or agent-side trust decisions about a service's real traction.

## Known failure modes

- One-off bulk buys inflate apparent adoption but are deduplicated, potentially flipping verdict from proven to partial or unproven
- Same-wallet or self-pay transactions are flagged and removed, reducing unique-payer count
- Insufficient payment history within the claim window may result in an unproven verdict even for legitimate services
- Missing or incomplete rail identifiers prevent settlement diversity analysis
- Claim window too short to establish cohort retention, leading to inconclusive partial verdict

## How this service works

Decision procedure for agents that must prove real adoption of a service from its x402 payment ledger. Inputs: paid-call history with payer addresses, amounts, timestamps, rail identifiers, and the claim window. Outputs: adoption verdict (proven, partial, unproven) with thresholds: unique-payer floor per week, repeat-purchase rate minimum, self-pay and same-wallet dedup rules, cohort retention across the claim window, and settlement diversity across rails. Failure modes: one-off bulk buys

## Output

A JSON object containing an adoption verdict (proven, partial, or unproven), a prose decision procedure brief explaining the reasoning, thresholds applied (unique-payer floor per week, repeat-purchase rate, self-pay/same-wallet dedup, cohort retention, rail diversity), the service slug, generation source (llm/reasoning/deterministic), and an ISO-8601 timestamp.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "$schema": "https://json-schema.org/draft/2020-12/schema",
 "required": [
  "input"
 ],
 "properties": {
  "input": {
   "type": "object",
   "required": [
    "type",
    "method"
   ],
   "properties": {
    "type": {
     "type": "string",
     "const": "http"
    },
    "method": {
     "enum": [
      "GET",
      "HEAD",
      "DELETE"
     ],
     "type": "string"
    },
    "queryParams": {
     "type": "object",
     "properties": {
      "meta": {
       "enum": [
        "0",
        "1"
       ],
       "type": "string",
       "description": "Set to 1 for free metadata JSON (no payment required)"
      },
      "topic": {
       "type": "string",
       "description": "Optional topic override for the decision procedure"
      }
     }
    }
   },
   "additionalProperties": false
  },
  "output": {
   "type": "object",
   "required": [
    "type"
   ],
   "properties": {
    "type": {
     "type": "string"
    },
    "example": {
     "type": "object",
     "title": "Agent Adoption Proof from x402 Payment Ledger paid response",
     "$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": {
         "type": "string"
        
… (truncated)
```

## Response schema (JSON Schema)

```json
{
 "type": "json",
 "example": {
  "ok": true,
  "paid": true,
  "result": {
   "ok": true,
   "brief": "plain prose decision procedure (120+ words)",
   "model": "deepseek/deepseek-v4-flash-0731",
   "topic": "string topic",
   "service": "agent-adoption-proof-from-x402-payment-ledger",
   "procedure": "same as brief",
   "generatedAt": "2026-01-01T00:00:00.000Z",
   "generationSource": "deterministic"
  },
  "service": "agent-adoption-proof-from-x402-payment-ledger",
  "provider": "K-2SO"
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/agent-adoption-proof-from-x402-payment-ledger-ab4a292a/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)