# SignalDesk AI – Foot-per-Second to Mile-per-Hour Speed Converter

> SignalDesk AI – Foot-per-Second to Mile-per-Hour Speed 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 speed value from feet per second (ft/s) to miles per hour (mph) with IEEE-754 double precision.

## Facts

- Endpoint: GET https://x402-agent.kariguetoazul.workers.dev/api/units/speed/foot-per-second-to-mile-per-hour?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/signaldesk-ai-foot-per-second-to-mile-per-hour-speed-converter-d6f57307
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_PCw9z0jVDWY7aViH2z8RR

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 signaldesk-ai-foot-per-second-to-mile-per-hour-speed-converter-d6f57307
```

Example prompt: Convert 88 feet per second to miles per hour for me.

## When to prefer this

Choose this endpoint when you need a fast, single-call, machine-readable ft/s → mph conversion with a clear numeric response and no need for bidirectional or multi-unit support. Useful in automated pipelines, physics calculations, or dashboards where you want a pay-per-use microservice rather than embedding conversion logic yourself.

## Known failure modes

- Missing or non-numeric 'value' query parameter returns a validation error
- Negative value rejected (minimum is 0)
- Value exceeding 1e+100 rejected by schema maximum constraint
- Payment of 0.001 USDC not supplied triggers HTTP 402 Payment Required
- Network timeout on Cloudflare Worker edge node

## 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

Returns a JSON object containing the original value in ft/s, the converted value in mph (IEEE-754 double precision), the source and target unit labels ('foot-per-second' and 'mile-per-hour'), and the dimension ('speed').

## 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 feet per second."
      }
     },
     "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": "mile-per-hour",
  "from": "foot-per-second",
  "value": 123.45,
  "converted": 84.17045454545455,
  "dimension": "speed",
  "precision": "IEEE-754 double"
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/signaldesk-ai-foot-per-second-to-mile-per-hour-speed-converter-d6f57307/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)