# Ultimate Frequency & Wavelength Converter API

> For the complete documentation index, see [llms.txt](/llms.txt).

Convert between frequency and wavelength using a configurable propagation speed and identify the spectrum band.

Use this endpoint to add the tool to your app, site, workflow, or agent without rebuilding formulas, validation, examples, and docs.

- Slug: `ultimate-frequency-wavelength-converter`
- Category: `science`
- Version: `2026-04-22`
- Credits per successful call: 1
- Starts on: free
- Max payload: 65536 bytes
- Privacy mode: `hash_only`
- Available on: free, starter, pro, business, scale
- Browser tool: https://miniwebtool.com/ultimate-frequency-wavelength-converter/

## Endpoint

`POST https://api.miniwebtool.com/v1/tools/ultimate-frequency-wavelength-converter/run`

## Request body

| Field | Type | Required | Description |
| --- | --- | --- | --- |
| `mode` | `str` | no | freq_to_wave | wave_to_freq Choices: freq_to_wave, wave_to_freq |
| `freq_value` | `float | None` | no |  |
| `freq_unit` | `str` | no | hz | khz | mhz | ghz | thz Choices: hz, khz, mhz, ghz, thz |
| `wave_value` | `float | None` | no |  |
| `wave_unit` | `str` | no | m | cm | mm | um | nm | ang Choices: m, cm, mm, um, nm, ang |
| `speed` | `float` | no |  |

## Example request

```json
{
  "mode": "freq_to_wave",
  "freq_value": 100,
  "freq_unit": "mhz",
  "wave_unit": "nm",
  "speed": 299792458.0
}
```

## cURL

```bash
curl -X POST https://api.miniwebtool.com/v1/tools/ultimate-frequency-wavelength-converter/run \
  -H 'Authorization: Bearer mwt_live_YOUR_KEY' \
  -H 'Content-Type: application/json' \
  -d '{"mode":"freq_to_wave","freq_value":100,"freq_unit":"mhz","wave_unit":"nm","speed":299792458.0}'
```

## Response envelope

```json
{
  "request_id": "01K...",
  "tool": "ultimate-frequency-wavelength-converter",
  "tool_version": "2026-04-22",
  "credits_used": 1,
  "result": {}
}
```

## Errors

Errors are RFC 7807 `application/problem+json`. Branch on `code`, not `title`.

## MCP

Agents can discover and call this tool through `https://api.miniwebtool.com/mcp` or `https://api.miniwebtool.com/v1/mcp` using MCP `tools/list` and `tools/call`.

## Frequently asked

### What does the Ultimate Frequency & Wavelength Converter API do?

Convert between frequency and wavelength using a configurable propagation speed and identify the spectrum band. Use it to add this utility without rebuilding formulas, validation, examples, and documentation.

### How much does one call cost?

1 credit per successful call. Failed calls do not bill.

### What parameters are required?

Required fields: (none). Full schema at `https://api.miniwebtool.com/v1/openapi.json`.

### Is this deterministic?

Yes. Same input, same output. Tool version: 2026-04-22.