# CallMeter AgentUtils Schema

> CallMeter AgentUtils Schema is a paid API for AI agents from api.callmeter.dev, paid per call via x402, $0.02/call, status unknown (last checked 2026-09-15).

Returns the JSON schema describing the agentutils input/output contract for the CallMeter API

## Facts

- Endpoint: POST https://api.callmeter.dev/v1/agentutils/schema
- Price: $0.02/call
- Payment: x402
- Status: unknown
- Last checked: 2026-09-15
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/callmeter-agentutils-schema-5ebe8cfb
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_C2pBoAVhofcUZF9yjiucn

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 callmeter-agentutils-schema-5ebe8cfb -d '<json body>'
```

Example prompt: Can you fetch the JSON schema for the CallMeter agentutils endpoint so I know exactly what fields to include in my request body and what the response will look like?

## When to prefer this

Choose this endpoint when you need to programmatically discover or validate the exact input/output contract for the CallMeter agentutils API before constructing calls, generating client code, or onboarding a new agent to the platform. It is the canonical source of truth for agentutils schema structure.

## Known failure modes

- Malformed request body returns 400 — ensure required fields (input, type, method, bodyType, body) are present
- Payment not fulfilled returns 402 — x402 payment of $0.02 USDC must be completed before the schema is returned
- Service unavailable returns 503 — retry with exponential backoff

## How this service works

Paid skill agentutils.schema

## Output

A JSON object containing the formal JSON Schema (draft 2020-12) that defines the required structure for calling the agentutils endpoint, including required fields (type, method, bodyType, body), their constraints (const values), and an example output object shape.

## 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",
    "bodyType",
    "body"
   ],
   "properties": {
    "body": {
     "type": "object"
    },
    "type": {
     "const": "http"
    },
    "method": {
     "const": "POST"
    },
    "bodyType": {
     "const": "json"
    }
   }
  },
  "output": {
   "type": "object",
   "properties": {
    "type": {
     "const": "json"
    },
    "example": {
     "type": "object"
    }
   }
  }
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/callmeter-agentutils-schema-5ebe8cfb/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from api.callmeter.dev](https://www.zero.xyz/host/api.callmeter.dev/llms.txt)