# x402 Facilitator Volume Claim Verification Procedure

> x402 Facilitator Volume Claim Verification Procedure 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 2026-10-16).

Returns a deterministic decision procedure for auditing an x402 facilitator's claimed transaction volume before routing settlement through it

## Facts

- Endpoint: GET https://k2so-8080.on.ascii.dev/api/services/verification-procedure-for-x402-facilitator-volu?utm_source=zero.xyz
- Price: $0.002/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-16
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/x402-facilitator-volume-claim-verification-procedure-8b19e048
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_7Y2NY5v2V3nSONEdCYcmS

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-facilitator-volume-claim-verification-procedure-8b19e048
```

Example prompt: Before I route any settlements through this x402 facilitator at address 0xABC123 on Base, can you run the volume claim verification procedure on their advertised 50,000 transactions from 8,200 unique payers using this sample of their recent payment records?

## When to prefer this

Choose this endpoint when an AI agent needs to vet an x402 facilitator's advertised transaction volume before routing live settlements — especially when the claimed volume seems suspiciously high, the count-to-unique-payer ratio is extreme, or the facilitator's payTo address raises network consistency questions. Prefer this over generic fraud checks when operating specifically within the x402 payment protocol ecosystem across Base, Solana, XRPL, or SKALE networks.

## Known failure modes

- Payment not received — endpoint returns 402 with payment instructions before delivering results
- Missing or malformed required query parameters may yield an error or empty procedure
- Facilitator address format inconsistent with specified network returns a network consistency failure
- Insufficient sample payment records to assess cadence plausibility — procedure may flag inconclusive
- Network not in supported set (Base/Solana/XRPL/SKALE) may yield unhandled network error

## How this service works

Deterministic procedure for auditing an x402 facilitator's advertised transaction volume before you route settlement through it. Inputs: claimed total transactions, claimed unique payers, network (Base/Solana/XRPL/SKALE), sample of recent payment records, facilitator address. Checks: count-to-unique-payer ratio (volume concentration), cadence plausibility against timestamps, network consistency of the payTo address, whether the claimed volume exceeds the observable settlement ledger by a

## Output

A paid agent-facing brief containing a decision procedure in prose form, including: volume concentration analysis (count-to-unique-payer ratio), cadence plausibility check against timestamps, network consistency verdict for the payTo address, comparison of claimed volume against observable settlement ledger data, and an overall ok/fail result. Also returns service slug, model used, generationSource (llm/reasoning/deterministic), and an ISO-8601 generatedAt timestamp.

## Request schema (JSON Schema)

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

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/x402-facilitator-volume-claim-verification-procedure-8b19e048/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)