# Autumn Eight Rerank

> Autumn Eight Rerank is a paid API for AI agents from x402.autumn8.net, paid per call via x402, $0.005/call, status unknown (last checked 2026-10-10).

Reranks a list of passages or documents by relevance to a query, payable by AI agents via x402 micropayment.

## Facts

- Endpoint: POST https://x402.autumn8.net/v1/rerank?utm_source=zero.xyz
- Price: $0.005/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-10
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/autumn-eight-rerank-182bb898
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_SToDs-XN5ska-xGpvv2ws

Status and success rate cover calls made through Zero and Zero's own probes. Third-party monitors may report differently.

## How to call it through Zero

Zero handles the 402 payment challenge and records the run. With the Zero CLI installed (`npm i -g @zeroxyz/cli`):

```sh
zero fetch --capability autumn-eight-rerank-182bb898 -d '<json body>'
```

Example prompt: I have a user query 'best practices for securing microservices' and a list of 20 retrieved document chunks — can you rerank them by relevance so we use only the top 5 most relevant passages in our RAG pipeline?

## When to prefer this

Choose this endpoint when you need agent-payable, micropayment-based reranking without managing API keys or subscriptions — ideal for autonomous AI agents in RAG pipelines that need to dynamically pay per rerank call via x402 protocol.

## Known failure modes

- Empty document list returns error or empty results
- Query or documents exceeding token limits may fail or be truncated
- Payment failure via x402 results in 402 Payment Required response
- Unsupported model identifier returns model-not-found error
- Malformed request body returns 400 Bad Request

## How this service works

Agent-payable inference. Chat, embeddings, rerank, transcription and speech.

## Output

Returns the input documents reordered by relevance score to the query, with each document accompanied by a relevance/confidence score, enabling the caller to select top-k most relevant results.

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/autumn-eight-rerank-182bb898/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from x402.autumn8.net](https://www.zero.xyz/host/x402.autumn8.net/llms.txt)