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NexusAPI AI Similarity
x402
NexusAPI AI Similarity is a paid API for AI agents from nexus-api-virid.vercel.app, paid per call via x402, $0.087051/call, status unknown (last checked 2026-09-14).
Computes semantic similarity between a query string and reference content using AI embeddings
Price / call$0.087051
Success—
StatusUnknown
How this service works
Crypto, AI, Social Media, Finance, Weather, Tools & more. Pay per call in USDC on Base. No API keys.
Output
Returns a similarity score or ranking indicating how semantically close the input query is to the reference content, likely expressed as a numeric value between 0 and 1 (or equivalent), computed via AI embeddings.
Example use cases
Deduplicating customer support tickets
“I have two support tickets — one says 'my payment failed' and another says 'I can't complete my purchase' — can you tell me how semantically similar they are so I know if they're duplicates?”
Ranking search results by relevance
“I have a user query 'best running shoes for flat feet' — can you score how semantically similar it is to this product description: 'stability trainers designed for overpronation and arch support'?”
Checking paraphrase in content moderation
“Check if these two sentences are saying the same thing semantically: 'the event is cancelled' versus 'the gathering will no longer take place' — give me a similarity score.”
Technical details
Endpoint
POSThttps://nexus-api-virid.vercel.app/api/ai/similarityWhen to prefer
Use this endpoint when you need lightweight, pay-per-call semantic similarity without managing your own embedding infrastructure or API keys. Prefer it for ad-hoc similarity checks in agent workflows where setting up a dedicated embedding service is overkill, or when operating in environments where USDC micropayments via x402 on Base are already supported.
Side effects
- Empty or missing query string returns validation error
- Query too long may exceed token limits and return an error
- Ambiguous or very short queries may produce unreliable similarity scores
- Service downtime on Vercel deployment returns 5xx error
- Insufficient USDC balance causes x402 payment failure before the request is processed
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| query | string | Search query or input parameter |
Output
Schema · Response
{
"type": "object",
"description": "API response data"
}Tags
x402
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