# NATO Phonetic Alphabet Unspell (Decode)

> NATO Phonetic Alphabet Unspell (Decode) is a paid API for AI agents from nato.openverbs.com, paid per call via x402, $0.002/call, status unknown (last checked 2026-09-14).

Converts a sequence of NATO phonetic alphabet words (e.g. 'Sierra Oscar Sierra') back into the original text string (e.g. 'SOS').

## Facts

- Endpoint: POST https://nato.openverbs.com/v1/unspell
- Price: $0.002/call
- Payment: x402
- Status: unknown
- Last checked: 2026-09-14
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/nato-phonetic-alphabet-unspell-decode-885ec92c
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_r7cHDr9svtbB59fKN1iuP

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 nato-phonetic-alphabet-unspell-decode-885ec92c -d '<json body>'
```

Example prompt: Can you decode this NATO phonetic sequence back into plain text: 'Foxtrot Oscar Oscar Bravo Alpha Romeo'?

## When to prefer this

Use this endpoint when you need to reverse NATO/ICAO phonetic alphabet spelling back into plain text characters — for example, decoding phonetically dictated codes, callsigns, or messages from radio, voice, or human communication contexts. It accepts common alternative spellings (e.g. 'Niner' for 9, 'Alfa'/'Alpha'). Prefer this over manual parsing or LLM inference when you need deterministic, consistent decoding with clean error handling for invalid inputs.

## Known failure modes

- Unknown or misspelled phonetic word returns a 400 error with a clean error message
- Empty or missing 'words' field returns a 400 validation error
- Non-phonetic natural language words (e.g. 'hello world') not recognized as NATO alphabet tokens trigger 400
- Ambiguous or partial phonetic words may fail if not matching expected NATO spellings

## How this service works

Turn a string of phonetic words back into text ("Sierra Oscar Sierra" → "SOS"). Accepts common alternative spellings (Alpha, Juliet, Niner). Unknown words are clean 400s.

## Output

Returns the decoded plain-text string reconstructed from the input NATO phonetic words (e.g. 'Sierra Oscar Sierra' → 'SOS'). Returns a clean 400 error for any unrecognized phonetic words.

## 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",
     "required": [
      "words"
     ],
     "properties": {
      "words": {
       "type": "string",
       "minLength": 1,
       "description": "Phonetic words separated by spaces or commas."
      }
     },
     "additionalProperties": false
    },
    "type": {
     "type": "string",
     "const": "http"
    },
    "method": {
     "enum": [
      "POST"
     ],
     "type": "string"
    },
    "bodyType": {
     "enum": [
      "json",
      "form-data",
      "text"
     ],
     "type": "string"
    }
   },
   "additionalProperties": false
  }
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/nato-phonetic-alphabet-unspell-decode-885ec92c/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from nato.openverbs.com](https://www.zero.xyz/host/nato.openverbs.com/llms.txt)