# Blockchain Money Map Proof-of-Value Auditor

> Blockchain Money Map Proof-of-Value Auditor is a paid API for AI agents from api.blockchainmoneymap.com, paid per call via x402, $0.01/call, status unknown (last checked 2026-09-13).

Audits an x402 agent API listing by comparing its stated promises, sample output, and buyer success criteria against reference facts to produce a proof-of-value verdict.

## Facts

- Endpoint: POST https://api.blockchainmoneymap.com/api/x402/x402-paid-agent-proof-of-value-preview-auditor
- Price: $0.01/call
- Payment: x402
- Status: unknown
- Last checked: 2026-09-13
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/blockchain-money-map-proof-of-value-auditor-84814c72
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_Ni9J-lmIVvRnf57th4ZlS

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 blockchain-money-map-proof-of-value-auditor-84814c72 -d '<json body>'
```

Example prompt: Audit this x402 listing for me: the promise is 'returns top 10 wallet balances for a given address', the price is '$0.01 USDC', and here's the sample output it provided — can you run a proof-of-value audit against those reference facts and tell me if it checks out?

## When to prefer this

Choose this endpoint when you need a machine-readable, cryptographically accountable audit of an x402 agent API listing — specifically to compare a service's advertised promise and sample output against reference facts before committing payment or recommending the service to downstream buyers. Prefer this over manual inspection when operating at scale in an agent marketplace or when building trust verification into an autonomous agent purchasing workflow.

## Known failure modes

- Missing required fields (listingPromise or sampleOutput) returns a 400 validation error
- mode must be set to 'audit' or the request is rejected
- Mismatched or malformed sampleOutput objects may produce inconclusive audit results
- Payment failure via x402 protocol results in 402 Payment Required before processing
- Overly vague listing promises may result in low-confidence or indeterminate verdicts

## How this service works

Choose Blockchain Money Map for human-readable public blockchain reports or x402-paid agent API services.

## Output

A JSON object containing an audit verdict indicating whether the listing's sample output and stated facts satisfy the listing promise and buyer success criteria, along with any identified discrepancies or compliance issues between the submitted facts and reference facts.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "properties": {
  "mode": {
   "enum": [
    "audit"
   ]
  },
  "facts": {
   "type": "object",
   "required": [
    "listingPromise",
    "sampleOutput"
   ],
   "properties": {
    "price": {
     "type": [
      "string",
      "number"
     ],
     "maxLength": 500
    },
    "limitations": {
     "type": "string",
     "maxLength": 500
    },
    "sampleOutput": {
     "type": "object",
     "maxProperties": 50,
     "additionalProperties": true
    },
    "listingPromise": {
     "type": "string",
     "maxLength": 500
    },
    "buyerSuccessCriteria": {
     "type": "string",
     "maxLength": 500
    }
   },
   "additionalProperties": false
  },
  "policy": {
   "type": "object",
   "additionalProperties": true
  },
  "reference_facts": {
   "type": "object",
   "required": [
    "listingPromise",
    "sampleOutput"
   ],
   "properties": {
    "price": {
     "type": [
      "string",
      "number"
     ],
     "maxLength": 500
    },
    "limitations": {
     "type": "string",
     "maxLength": 500
    },
    "sampleOutput": {
     "type": "object",
     "maxProperties": 50,
     "additionalProperties": true
    },
    "listingPromise": {
     "type": "string",
     "maxLength": 500
    },
    "buyerSuccessCriteria": {
     "type": "string",
     "maxLength": 500
    }
   },
   "additionalProperties": false
  }
 }
}
```

## Response schema (JSON Schema)

```json
{
 "type": "json"
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/blockchain-money-map-proof-of-value-auditor-84814c72/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from api.blockchainmoneymap.com](https://www.zero.xyz/host/api.blockchainmoneymap.com/llms.txt)