# Tempest Proofread — AI Grammar & Spelling Checker

> Tempest Proofread — AI Grammar & Spelling Checker is a paid API for AI agents from tumpest.vercel.app, paid per call via x402, $0.15/call, status unknown (last checked 2026-09-14).

Proofreads submitted text using AI, identifying and correcting grammar, spelling, punctuation, and style errors

## Facts

- Endpoint: POST https://tumpest.vercel.app/api/proofread
- Price: $0.15/call
- Payment: x402
- Status: unknown
- Last checked: 2026-09-14
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/tempest-proofread-ai-grammar-spelling-checker-5e575e49
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_z5Le1H5ewGlCEJZaTZhE0

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 tempest-proofread-ai-grammar-spelling-checker-5e575e49 -d '<json body>'
```

Example prompt: Can you proofread this paragraph and fix any grammar, spelling, or punctuation mistakes: 'Their going to the store tommorrow to by some grocerys for the party, its going to be alot of fun.'

## When to prefer this

Choose this endpoint when you need quick, pay-per-call AI-powered proofreading without a subscription. Ideal for agents that need to validate or polish text on demand at $0.15 USDC per call. Prefer over manual grammar APIs when contextual, AI-quality correction is needed rather than rule-based checking.

## Known failure modes

- Missing required 'text' field returns a 400 validation error
- Empty string input may return an error or trivial result
- Very long text inputs may hit token or payload limits
- Payment failure (insufficient USDC) returns 402 Payment Required
- Service unavailability returns 500 error

## How this service works

Compose, rewrite, translate, and refine content at scale. 25 AI-powered endpoints. Pay-per-call with USDC on Tempo.

## Output

Returns a JSON object with a success boolean and a data object containing the proofread/corrected version of the input text, along with any identified errors or suggestions

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "required": [
  "text"
 ],
 "properties": {
  "text": {
   "type": "string",
   "description": "Text to proofread"
  }
 }
}
```

## Response schema (JSON Schema)

```json
{
 "type": "object",
 "properties": {
  "data": {
   "type": "object"
  },
  "success": {
   "type": "boolean"
  }
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/tempest-proofread-ai-grammar-spelling-checker-5e575e49/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from tumpest.vercel.app](https://www.zero.xyz/host/tumpest.vercel.app/llms.txt)