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Multilingual RAG Reranking API
x402
Multilingual RAG Reranking API is a paid API for AI agents from api.delx.ai, paid per call via x402, $0.003/call, status unknown (last checked 2026-09-14).
Ranks 2–16 multilingual candidate texts (passages, tools, routes, or answers) against a query by cosine similarity, returning ordered indexes and a SHA-256 receipt for $0.003 USDC.
Price / call$0.003
Success—
StatusUnknown
How this service works
Multilingual RAG reranking API for agents: rank 2-16 passages, tools, routes, search results, or support answers against one query for $0.003 USDC. Returns original candidate indexes, relative cosine scores, and a durable SHA-256 receipt. No API key, subscription, raw embeddings, or provider controls.
Output
Returns the original zero-based indexes of the candidate texts ordered by relevance to the query, relative cosine similarity scores for each candidate, and a durable SHA-256 receipt that can be used to verify the result.
Example use cases
Multilingual support answer ranking
“I have 8 knowledge-base articles in English and German and a customer asked 'wie kann ich mein Konto kündigen?' — can you rank all 8 by how well they answer that question and give me their original indexes?”
RAG passage reranking before LLM generation
“I retrieved 12 chunks from my vector store for the query 'what are the side effects of ibuprofen?' — please rerank them by relevance and return the top ones so I can pass them to the LLM.”
Agent tool routing by intent similarity
“I have 5 tool descriptions and the user intent is 'book a flight to Paris for next Monday' — rank all 5 tools by how well they match that intent so I can pick the right one to call.”
Technical details
Endpoint
POSThttps://api.delx.ai/api/v1/x402/rank-multilingual-textsWhen to prefer
Choose this endpoint when you need language-agnostic semantic reranking across 2–16 passages without managing embedding infrastructure, API keys, or provider accounts. Ideal for multilingual RAG pipelines, agentic tool routing, or support answer selection where a pay-per-call model ($0.003 USDC) is preferable to a subscription. The SHA-256 receipt makes it suitable when auditability of ranking decisions matters.
Side effects
- Fewer than 2 or more than 16 candidates causes validation error
- Query or candidate text exceeds character limits (1000 / 2000 chars) returns 400
- Duplicate candidate texts rejected due to uniqueItems constraint
- Insufficient USDC balance or failed x402 payment returns 402
- Non-string or malformed JSON body returns 400
- Service unavailability returns 503 with no receipt issued
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| query | string | The multilingual search question or intent to rank against. |
| candidates | array | Unique candidate texts; returned by original zero-based index. |
Output
Schema · Response
{
"type": "json",
"example": {
"model": "beautyyuyanli/multilingual-e5-large",
"ranked": [
{
"score": 0.912314,
"candidate_index": 1
},
{
"score": 0.134221,
"candidate_index": 0
}
],
"sha256": "2d6c7c2b3f3c8e1e7b0d3a5b6e7f8a9b1234567890abcdef1234567890abcdef",
"provider": "replicate",
"media_type": "application/json",
"ranking_url": "https://api.delx.ai/api/v1/generated-rankings/ranking-example.json",
"input_sha256": "34a8815e9c57e321194d50f2ea8b64394019fb8038c9aefd7a9a306a5030fc31",
"generation_id": "ranking-example-generation-id",
"candidate_count": 2,
"sale_price_usdc": 0.003,
"gross_margin_usd": 0.002025,
"upstream_cost_usd": 0.000975
}
}Tags
x402
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