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CortexCloud Rerank
x402
CortexCloud Rerank is a paid API for AI agents from api.cortexcloud.org, paid per call via x402, $0.006/call, status unknown (last checked 2026-10-27).
Reranks a list of documents or passages by relevance to a query using Cohere (primary) with Jina as fallback, paid per call in USDC via x402.
Price / call$0.006
Success—
StatusUnknown
How this service works
One pay-per-call API for AI agents: optimization, AI, research, on-chain data, and automation — all settled in USDC on Base via x402. Discover via MCP and Bazaar, estimate free, pay per call. No API keys, no signup.
Output
An ordered list of the input documents re-sorted by relevance score to the query, with each document assigned a numeric relevance score. The highest-scoring, most semantically relevant documents appear first.
Example use cases
RAG pipeline context improvement
“I have 20 chunks retrieved from my document store for the query 'how does compound interest work' — can you rerank them by relevance so I only feed the top 5 most relevant ones to the LLM?”
Search results reordering
“I ran a keyword search and got back 15 product descriptions for 'wireless noise-cancelling headphones' — rerank them so the most semantically relevant ones appear first.”
QA candidate passage selection
“Here are 12 passages extracted from medical literature — rerank them by relevance to the question 'What are the recommended treatments for type 2 diabetes?' so I can pick the best ones to cite.”
Technical details
Endpoint
GEThttps://api.cortexcloud.org/v1/ml/rerank?utm_source=zero.xyzWhen to prefer
Choose this endpoint when you need neural cross-encoder reranking to improve precision of retrieved documents in a RAG or search pipeline, especially when you want no API key management (x402 USDC payment handles auth) and want automatic fallback from Cohere to Jina. Prefer it over embedding-only retrieval when you need a second-stage reranker to boost relevance of your top-k candidates.
Side effects
- Payment not included or insufficient USDC on Base — returns 402 Payment Required
- Upstream Cohere API unavailable and Jina fallback also fails — returns 5xx error
- Empty or malformed document list — returns 400 Bad Request
- Query string missing — reranking cannot proceed without a reference query
- Too many documents exceeding model token limits — truncation or error
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| input | — | |
| output | — |
Output
Schema · Response
{
"type": "object",
"format": "application/json",
"example": {}
}Tags
x402
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