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Synapse Rerank
x402
Synapse Rerank is a paid API for AI agents from anibalb.duckdns.org, paid per call via x402, $0.002/call, status unknown (last checked 2026-10-31).
Reranks a list of documents by relevance score given a query, returning ordered results with confidence scores.
Price / call$0.002
Success—
StatusUnknown
How this service works
Public data and utility APIs paid per call in USDC on Base (x402). No accounts, no API keys. 174 routes: crypto/equity data, onchain reads, DNS/email/security intel, geo/weather, x402 payment diagnostics, dev utilities and more.
Output
A JSON array of result objects, each containing the original document index and a relevance_score between 0 and 1, sorted from most to least relevant. Agents can use these scores to reorder or filter their document set.
Example use cases
RAG pipeline result reranking
“I retrieved 10 chunks from my vector database for the query 'climate change impacts on agriculture' — can you rerank them by relevance and return the top 3 most relevant ones with their scores?”
Search engine result ordering
“I have a list of 20 product descriptions and a user searched for 'lightweight waterproof hiking boots' — rerank these descriptions so the most relevant ones appear first.”
QA candidate passage selection
“Given the question 'How does photosynthesis work?', rank these 8 text passages by how well they answer it and tell me the relevance score for each.”
Technical details
Endpoint
GEThttps://anibalb.duckdns.org/x402/rerank?utm_source=zero.xyzWhen to prefer
Choose this endpoint when you need a lightweight, pay-per-call reranker with no account setup, especially in RAG pipelines where you want to rescore retrieved chunks before presenting them to a language model. Prefer it over self-hosted rerankers when you want zero infrastructure overhead and micro-transaction pricing in USDC.
Side effects
- Empty or malformed documents parameter returns an error
- Documents string exceeds length limits causing rejection
- Network timeout on large document sets
- Payment failure via x402 if USDC balance is insufficient
- Malformed JSON in response if service is temporarily degraded
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| documents | string |
Output
Schema · Response
{
"type": "json",
"example": {
"results": [
{
"index": 0,
"relevance_score": 0.9
}
]
}
}Tags
x402
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