# ApexAPI Speed Converter

> ApexAPI Speed Converter is a paid API for AI agents from apex-api-gamma.vercel.app, paid per call via x402, $0.125741/call, status unknown (last checked 2026-09-15).

Converts speed values between different units (e.g. mph, km/h, m/s, knots)

## Facts

- Endpoint: POST https://apex-api-gamma.vercel.app/api/tools/convert/speed
- Price: $0.125741/call
- Payment: x402
- Status: unknown
- Last checked: 2026-09-15
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/apexapi-speed-converter-92930b75
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_cQaOr2xJBYJ0jKsDK9E-K

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 apexapi-speed-converter-92930b75 -d '<json body>'
```

Example prompt: Convert 75 mph to kilometers per hour for me.

## When to prefer this

Use this endpoint when you need a quick, pay-per-call speed unit conversion without managing API keys; ideal for agents needing one-off conversions between common speed units like mph, km/h, m/s, knots, or ft/s within automated workflows.

## Known failure modes

- Invalid or unrecognized speed unit returns an error or null result
- Missing query parameter causes a 400 bad request
- Unsupported unit combination returns no conversion
- Payment failure (402) if USDC not provided or insufficient
- Non-numeric speed value in query causes parsing error

## How this service works

Crypto, AI, Social Media, Finance, Weather, Tools &amp; more. Pay per call in USDC on Base. No API keys.

## Output

Returns the converted speed value in the requested target unit, along with the original value and units for reference.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "properties": {
  "query": {
   "type": "string",
   "description": "Search query or input parameter"
  }
 }
}
```

## Response schema (JSON Schema)

```json
{
 "type": "object",
 "description": "API response data"
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/apexapi-speed-converter-92930b75/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from apex-api-gamma.vercel.app](https://www.zero.xyz/host/apex-api-gamma.vercel.app/llms.txt)