# Blockchain Money Map x402 Facilitator Cost Comparator

> Blockchain Money Map x402 Facilitator Cost Comparator 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).

Compares the cost of using different x402 payment facilitator providers given expected call volume and average price, helping agents and developers pick the cheapest option.

## Facts

- Endpoint: POST https://api.blockchainmoneymap.com/api/x402/x402-facilitator-cost-comparator
- 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-x402-facilitator-cost-comparator-35026895
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_bs_9WhQtBSnwE0yDAYRRj

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-x402-facilitator-cost-comparator-35026895 -d '<json body>'
```

Example prompt: Compare x402 facilitator costs for me — I'm expecting 50,000 calls per month at an average price of $0.01 per call across providers like Coinbase and CDN3, and I want to know which is cheapest.

## When to prefer this

Use this endpoint when you need to programmatically compare the total cost of different x402 payment facilitators before committing to one for a production agent or API service. It is especially useful for high-volume scenarios where small per-call fee differences compound significantly, or when evaluating a switch from an existing provider using the reference_facts baseline feature.

## Known failure modes

- Missing required facts fields (expected_monthly_calls, average_price_usd, providers) returns a validation error
- Providers array exceeding 50 items is rejected
- Mode not set to 'compare' may return an unsupported operation error
- Invalid or non-numeric pricing/call values return a schema validation error
- Payment of 0.01 USDC not received results in 402 Payment Required response

## How this service works

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

## Output

A JSON response containing a cost comparison across the specified x402 facilitator providers, including estimated total monthly costs, per-call fees or percentages for each provider, a ranking by cost, and optionally a delta vs. a reference baseline setup.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "properties": {
  "mode": {
   "enum": [
    "compare"
   ]
  },
  "facts": {
   "type": "object",
   "required": [
    "expected_monthly_calls",
    "average_price_usd",
    "providers"
   ],
   "properties": {
    "providers": {
     "type": "array",
     "maxItems": 50
    },
    "average_price_usd": {
     "type": "number"
    },
    "expected_monthly_calls": {
     "type": "number"
    }
   },
   "additionalProperties": false
  },
  "policy": {
   "type": "object",
   "additionalProperties": true
  },
  "reference_facts": {
   "type": "object",
   "required": [
    "expected_monthly_calls",
    "average_price_usd",
    "providers"
   ],
   "properties": {
    "providers": {
     "type": "array",
     "maxItems": 50
    },
    "average_price_usd": {
     "type": "number"
    },
    "expected_monthly_calls": {
     "type": "number"
    }
   },
   "additionalProperties": false
  }
 }
}
```

## Response schema (JSON Schema)

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

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/blockchain-money-map-x402-facilitator-cost-comparator-35026895/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)