# ApexAPI Grammar Checker

> ApexAPI Grammar Checker is a paid API for AI agents from apex-api-gamma.vercel.app, paid per call via x402, $0.184005/call, status unknown (last checked 2026-09-14).

Checks and corrects grammar in a given text input, returning grammar errors and/or corrected text

## Facts

- Endpoint: POST https://apex-api-gamma.vercel.app/api/ai/grammar
- Price: $0.184005/call
- Payment: x402
- Status: unknown
- Last checked: 2026-09-14
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/apexapi-grammar-checker-a634ef9e
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_tlQh7-dkSTFRHujBS-sOM

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 apexapi-grammar-checker-a634ef9e -d '<json body>'
```

Example prompt: Can you check the grammar of this sentence and fix any mistakes: 'She dont know nothing about the new policy that was being announced yesterday'?

## When to prefer this

Use this endpoint when you need a quick, pay-per-call grammar check without setting up API keys or subscriptions. Ideal for agents that occasionally need to proofread user-generated content, drafts, or messages and want to pay only for what they use via USDC on Base.

## Known failure modes

- Empty or missing query string returns an error
- Very long text may exceed input limits
- Payment failure (402) if USDC balance is insufficient
- Non-English text may produce inaccurate results
- Ambiguous text may not yield clear 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 a response object containing grammar analysis of the input text, likely including corrected text, identified grammatical errors, and/or improvement suggestions.

## 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/apexapi-grammar-checker-a634ef9e/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from apex-api-gamma.vercel.app](https://www.zero.xyz/host/apex-api-gamma.vercel.app/llms.txt)