# PrimeAPI Grammar Checker

> PrimeAPI Grammar Checker is a paid API for AI agents from prime-api-seven.vercel.app, paid per call via x402, $0.184005/call, status unknown (last checked 2026-09-15).

Checks and corrects grammar in a given text string, returning grammar analysis or corrected output

## Facts

- Endpoint: POST https://prime-api-seven.vercel.app/api/ai/grammar
- Price: $0.184005/call
- Payment: x402
- Status: unknown
- Last checked: 2026-09-15
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/primeapi-grammar-checker-9084f5cb
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_7yPSSlRilbKRuEyE6mWoC

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 primeapi-grammar-checker-9084f5cb -d '<json body>'
```

Example prompt: Can you check the grammar of this sentence and tell me what's wrong with it: 'She go to the store yesterday and buyed some apple'?

## When to prefer this

Use this endpoint when an agent needs a quick, pay-per-call grammar check without managing API keys — suitable for one-off grammar validation tasks where integrating a dedicated NLP service is overkill

## Known failure modes

- Empty or missing query string returns an error
- Overly long text may be truncated or rejected
- Non-English input may produce inaccurate results
- Payment failure in USDC/Base blocks the request
- Vague or ambiguous inputs may return unhelpful corrections

## 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 grammar analysis of the input text, likely including detected errors, corrections, or a corrected version of the submitted string

## 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/primeapi-grammar-checker-9084f5cb/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from prime-api-seven.vercel.app](https://www.zero.xyz/host/prime-api-seven.vercel.app/llms.txt)