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OmniAPI Grammar Checker
x402
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
Price / call$0.033122
Success—
StatusUnknown
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
Example use cases
Email draft grammar review
“Please check the grammar of this email draft before I send it: 'Dear John, I wanted to letting you know that the report are ready for your review. Please let me know if you have any question.'”
Student essay proofreading
“Can you find and fix all the grammar mistakes in this paragraph from my essay: 'The results of the study shows that students who reads more tends to perform better in they exams.'”
Social media caption cleanup
“Fix the grammar in this Instagram caption I wrote: 'Had such a amazing time at the concert last night, me and my friends was dancing all night long!'”
Technical details
Endpoint
POSThttps://omni-api-cyan.vercel.app/api/ai/grammarWhen to prefer
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.
Side effects
- 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
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| input | string | Input data for the endpoint |
| queryrequired | string | Search query or input text |
| params | object | Additional parameters |
Output
Schema · Response
{
"type": "object",
"description": "API response data"
}Tags
x402
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