Rank up to 50 documents by relevance to a query in a single call
Rank up to 50 documents by relevance to a query in a single call - each document returned with its relevance probability, sorted highest first. Try GET /rank/sample.
Answeringour last check, 2026-09-28
1 of 1checks answered this week
870 msmedian answer time
$0.001listed price per call
$0.001price it asked us
Paid test badge: not yet. The checks above are free: we call the tool without paying and read the payment request it sends back. The Verified badge needs paid calls whose answers match the promised output, and nobody can buy a badge.
Endpoint
POST https://x402.agentindex.world/rank
| Category | Everything else |
|---|---|
| Provider host | x402.agentindex.world |
| Networks | eip155:8453 |
| Payment schemes | exact |
| Self-reported calls, 30 days | 1 from 1 payers (the provider's figure, not ours) |
Our checks, last 30 days
| Day | Result | HTTP | Asked | Time |
|---|---|---|---|---|
| 2026-09-28 | valid payment request | 402 | $0.001 | 870 ms |
Example input (from the provider)
{
"body": {
"documents": [
"A blog post comparing REST API versioning strategies: URL path, header, and query param versioning.",
"A recipe for chocolate cake with step-by-step baking instructions.",
"A guide to RESTful resource naming conventions and correct HTTP verb usage."
],
"query": "best practices for REST API design"
},
"bodyType": "json",
"method": "POST",
"type": "http"
}
Promised output schema (from the provider)
{
"$schema": "https://json-schema.org/draft/2020-12/schema",
"properties": {
"input": {
"additionalProperties": false,
"properties": {
"body": {
"properties": {
"documents": {
"description": "Up to 50 documents to rank by relevance to the query. Each truncated to 2000 characters before scoring.",
"items": {
"type": "string"
},
"maxItems": 50,
"minItems": 1,
"type": "array"
},
"query": {
"description": "The query to rank documents against.",
"type": "string"
}
},
"required": [
"query",
"documents"
]
},
"bodyType": {
"enum": [
"json",
"form-data",
"text"
],
"type": "string"
},
"method": {
"enum": [
"POST",
"PUT",
"PATCH"
],
"type": "string"
},
"type": {
"const": "http",
"type": "string"
}
},
"required": [
"type",
"method",
"bodyType",
"body"
],
"type": "object"
},
"output": {
"properties": {
"example": {
"properties": {
"documents": {
"description": "Input documents, sorted by relevance score descending.",
"items": {
"properties": {
"document": {
"type": "string"
},
"score": {
"description": "Relevance probability, 0-1.",
"type": "number"
}
},
"type": "object"
},
"type": "array"
},
"x402_receipt": {
"description": "Billing and provenance receipt for this call.",
"type": "object"
}
},
"required": [
"documents"
],
"type": "object"
},
"type": {
"type": "string"
}
},
"required": [
"type"
],
"type": "object"
}
},
"required": [
"input"
],
"type": "object"
}