# OmniAPI Grammar Checker

> OmniAPI Grammar Checker is a paid API for AI agents from omni-api-cyan.vercel.app, paid per call via x402, $0.033122/call, status unknown (last checked 2026-09-15).

Checks and corrects grammar in a given text input, returning grammatically improved or validated content

## Facts

- Endpoint: POST https://omni-api-cyan.vercel.app/api/ai/grammar
- Price: $0.033122/call
- Payment: x402
- Status: unknown
- Last checked: 2026-09-15
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/omniapi-grammar-checker-22adc991
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_xHFLhRDHomxG6xd37o9OH

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 omniapi-grammar-checker-22adc991 -d '<json body>'
```

Example prompt: Can you check the grammar of this sentence and fix any errors: 'She don't know nothing about the meeting that was scheduled for yesterday'?

## When to prefer this

Choose this endpoint when you need a quick, pay-per-call grammar check without committing to a subscription-based writing tool. It is suitable for lightweight grammar validation tasks within an agentic workflow where text quality assurance is a step rather than the primary goal. Prefer this over dedicated writing platforms like Grammarly when cost-per-call economics matter and you are already using the OmniAPI ecosystem for other tasks.

## Known failure modes

- Missing required 'query' field returns a validation error
- Extremely long text inputs may be truncated or rejected
- Ambiguous or context-free fragments may produce inaccurate corrections
- Non-English text may not be handled correctly if the model is English-only
- Payment failure via x402 returns HTTP 402 before processing occurs

## How this service works

444 endpoints across 9+ chains. Crypto, AI, Social, Finance, Weather, Tools. Pay per call in USDC via x402 with 4 facilitators: Dexter, Meridian, FluxA, GoPlausible.

## Output

Returns a response containing the grammatically corrected or validated version of the input text, along with any grammar suggestions or improvements identified by the AI grammar engine

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "required": [
  "query"
 ],
 "properties": {
  "input": {
   "type": "string",
   "description": "Input data for the endpoint"
  },
  "query": {
   "type": "string",
   "description": "Search query or input text"
  },
  "params": {
   "type": "object",
   "description": "Additional parameters"
  }
 }
}
```

## Response schema (JSON Schema)

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

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/omniapi-grammar-checker-22adc991/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from omni-api-cyan.vercel.app](https://www.zero.xyz/host/omni-api-cyan.vercel.app/llms.txt)