# Word Tools Autocomplete

> Word Tools Autocomplete is a paid API for AI agents from word-tools.x402tookit.com, paid per call via x402, $0.02/call, status unknown (last checked 2026-10-21).

Returns word completions for a given prefix, ranked by frequency, useful for typeahead suggestions and name brainstorming.

## Facts

- Endpoint: GET https://word-tools.x402tookit.com/autocomplete?utm_source=zero.xyz
- Price: $0.02/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-21
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/word-tools-autocomplete-a0cf51e9
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_3icMhjkbooxVUL8xTX09l

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 word-tools-autocomplete-a0cf51e9
```

Example prompt: Give me up to 30 word completions for the prefix 'inter', ranked by how common they are.

## When to prefer this

Choose this endpoint when you need frequency-ranked word completions for a given prefix — ideal for typeahead UIs, autocomplete dropdowns, or brainstorming word/name ideas starting with a specific string. Prefer it over a general dictionary API when ranking by real-world word frequency matters.

## Known failure modes

- Missing 'word' query parameter returns a 400 error
- Prefix with no known completions returns an empty results array
- limit outside 1-50 range may be clamped or rejected
- Payment not included or insufficient returns a 402 Payment Required response

## How this service works

Word completions for a prefix, ranked by how common they are, for typeahead and name ideas.

## Output

A list of up to 50 word completions for the given prefix, each with the completed word, a frequency-based score, and a flag indicating whether it starts with the input. Also includes the prefix echo, source attribution, and optional summary.

## 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"
     ],
     "type": "string"
    },
    "queryParams": {
     "type": "object",
     "required": [
      "word"
     ],
     "properties": {
      "word": {
       "type": "string",
       "description": "The prefix typed so far"
      },
      "limit": {
       "type": "integer",
       "description": "Results 1 to 50 (default 20)"
      }
     }
    }
   },
   "additionalProperties": false
  },
  "output": {
   "type": "object",
   "required": [
    "type"
   ],
   "properties": {
    "type": {
     "type": "string"
    },
    "example": {
     "type": "object",
     "properties": {
      "asOf": {
       "type": [
        "null",
        "string"
       ]
      },
      "prefix": {
       "type": [
        "null",
        "string"
       ]
      },
      "source": {
       "type": [
        "null",
        "string"
       ]
      },
      "reasons": {
       "type": [
        "array",
        "null"
       ],
       "items": {
        "type": "string"
       }
      },
      "results": {
       "type": [
        "array",
        "null"
       ],
       "items": {
        "type": "object",
        "properties": {
         "word": {
          "type": [
           "null",
           "string"
          ]
         },
         "score": {
          "type": [
           "null",
           "number"
          ]
         },
         "startsWithInput": {
          "type": [
           "boolean",
           "null"
          ]
         }
        }
       }
      },
      "summary": {
       "type": [
        "null",
        "string"
       ]
      },
      "verdict": {
       "type": [
        "null",
        "string"
       ]
      },
      "degraded": {
       "type": [
        "boolean",
        "null"
       ]
      },
      "sourceUrl": {
       "type": [
        "null",
        "string"
       ]
      },
      "disclaimer": {
       "type": [
        "null",
        "string"
       ]
      },
      "notChecked": {
       "type": [
        "array",
        "null"
       ],
       "items": {
        "type": "string"
       }
      },
      "attribution": {
       "type": [
        "null",
        "string"
       ]
      }
     }
   
… (truncated)
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/word-tools-autocomplete-a0cf51e9/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from word-tools.x402tookit.com](https://www.zero.xyz/host/word-tools.x402tookit.com/llms.txt)