# Stone to Metric Tonne Converter

> Stone to Metric Tonne Converter is a paid API for AI agents from x402-agent.kariguetoazul.workers.dev, paid per call via x402, $0.001/call, status unknown (last checked 2026-10-13).

Converts a mass value in stones to metric tonnes using IEEE-754 double precision arithmetic

## Facts

- Endpoint: GET https://x402-agent.kariguetoazul.workers.dev/api/units/mass/stone-to-metric-tonne?utm_source=zero.xyz
- Price: $0.001/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-13
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/stone-to-metric-tonne-converter-d74e4e86
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_YtewCAdLxOqrXZo554Dxg

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 stone-to-metric-tonne-converter-d74e4e86
```

Example prompt: Convert 123.45 stones to metric tonnes for me.

## When to prefer this

Use this endpoint when you need a quick, precise, on-demand stone-to-metric-tonne conversion via an API call, especially in automated pipelines or agent workflows that already use x402 micropayment infrastructure. Prefer it over manual calculation when audit trails or programmatic integration matter.

## Known failure modes

- Missing or non-numeric 'value' query parameter returns an error
- Negative value rejected (minimum is 0)
- Value exceeding 1e+100 rejected (maximum enforced by schema)
- Payment not provided or invalid x402 payment header causes 402 response
- Rate limit or free quota exhausted returns quota error

## How this service works

Evidence-backed autonomous AI jobs and paid data tools. Queue/D1/cron run outside the chat; free quotas and bounded execution apply.

## Output

A JSON object containing the original value, the source unit ('stone'), the target unit ('metric-tonne'), the converted numeric result in metric tonnes computed with IEEE-754 double precision, and a 'dimension' label confirming mass.

## 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",
     "required": [
      "value"
     ],
     "properties": {
      "value": {
       "type": "number",
       "maximum": 1e+100,
       "minimum": 0,
       "description": "Amount in stones."
      }
     },
     "additionalProperties": false
    }
   },
   "additionalProperties": false
  },
  "output": {
   "type": "object",
   "required": [
    "type"
   ],
   "properties": {
    "type": {
     "type": "string"
    },
    "example": {
     "type": "object"
    }
   }
  }
 }
}
```

## Response schema (JSON Schema)

```json
{
 "type": "json",
 "example": {
  "to": "metric-tonne",
  "from": "stone",
  "value": 123.45,
  "converted": 0.7839436930710001,
  "dimension": "mass",
  "precision": "IEEE-754 double"
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/stone-to-metric-tonne-converter-d74e4e86/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from x402-agent.kariguetoazul.workers.dev](https://www.zero.xyz/host/x402-agent.kariguetoazul.workers.dev/llms.txt)