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OmniAPI AI Similarity
x402
OmniAPI AI Similarity is a paid API for AI agents from omni-api-cyan.vercel.app, paid per call via x402, $0.087051/call, status unknown (last checked 2026-09-14).
Computes semantic similarity between a query text and input data, returning a similarity score or ranked results
Price / call$0.087051
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 similarity score or ranked relevance results comparing the query text against the provided input, likely including a numerical score (0-1) and possibly additional metadata about the match quality.
Example use cases
Semantic search relevance scoring
“I have a search query 'renewable energy storage solutions' and a document snippet about lithium batteries — can you score how relevant the document is to the query?”
Duplicate content detection
“Check how similar these two product descriptions are to each other: 'lightweight waterproof hiking boots with grip sole' and 'trail running shoes with water resistance and traction' — are they essentially the same?”
Candidate resume matching
“Score how closely this resume summary 'experienced Python developer with 5 years in data pipelines and cloud infrastructure' matches the job query 'senior data engineer with cloud and ETL experience'.”
Technical details
Endpoint
POSThttps://omni-api-cyan.vercel.app/api/ai/similarityWhen to prefer
Choose this endpoint when you need a pay-per-call, no-subscription semantic similarity computation that works within a crypto-native x402 payment flow. Best for agents already operating in the OmniAPI ecosystem or when you need lightweight on-demand similarity scoring without standing up a dedicated embedding service.
Side effects
- Missing required 'query' field returns validation error
- Empty or very short query strings may produce unreliable scores
- Payment failure via x402 results in 402 response before processing
- Extremely long input texts may be truncated or rejected
- Non-English or multilingual text may yield degraded similarity accuracy
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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