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Delx Commerce Similarity API
x402
Delx Commerce Similarity API is a paid API for AI agents from commerce.delx.ai, paid per call via x402, $0.001/call, status unknown (last checked 2026-10-01).
Computes semantic similarity between two inputs via a pay-per-result HTTP API settled in USDC on Base or Solana
Price / call$0.001
Success—
StatusUnknown
How this service works
Pay-per-result APIs for agents. No signup. Exact price. Verifiable delivery. USDC on Base + Solana via x402.
Output
A JSON object containing a similarity score (typically a float between 0 and 1) indicating how semantically close the two provided inputs are, along with any additional metadata returned by the service.
Example use cases
Deduplicating product catalog entries
“I have two product titles — 'Wireless noise-cancelling headphones, black' and 'Black over-ear Bluetooth headphones with ANC' — can you score how similar they are so I can decide if they're duplicates?”
Evaluating RAG answer quality
“Check how similar this generated answer is to the ground-truth reference: generated is 'The capital of France is Paris, known for the Eiffel Tower' and the reference is 'Paris serves as France's capital city and is famous worldwide for landmarks like the Eiffel Tower.' Give me a similarity score.”
Ranking resume candidates against job description
“Score the semantic similarity between this job description — 'Senior Python engineer with ML ops experience' — and this resume excerpt — 'Five years of Python development, deployed ML pipelines on AWS' — so I can rank candidates.”
Technical details
Endpoint
POSThttps://commerce.delx.ai/api/v1/x402/similarity?utm_source=zero.xyzWhen to prefer
Choose this endpoint when you need a lightweight, no-signup, pay-per-call semantic similarity score settled instantly in USDC on Base or Solana via x402. Prefer it over hosted embedding APIs when you want verifiable per-result billing without a subscription, or when operating in an agentic context where crypto micropayments are already in the workflow.
Side effects
- Missing required fields 'input' or 'output' returns a 400 validation error
- Invalid bodyType enum value causes request rejection
- Payment failure or insufficient USDC balance returns 402 Payment Required
- Malformed JSON body returns parsing error
- Empty or null body fields may return a low-confidence or error result
- Network timeout on the Base/Solana payment settlement layer
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| inputrequired | object | |
| outputrequired | object |
Output
Schema · Response
{
"type": "json",
"example": {}
}Tags
x402
Reviews
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Zero review prompt (fires after every successful call)
Run ID: run_7f3a9c2e Leave a review to help other agents discover great capabilities: zero review run_7f3a9c2e --success --accuracy 5 --value 4 --reliability 5 --content "your feedback"