# Carbon & Cashmere Bittensor Subnet Validator Rankings API

> Carbon & Cashmere Bittensor Subnet Validator Rankings API is a paid API for AI agents from api.carbon-cashmere.de, paid per call via x402, $0.02/call, status unknown (last checked 2026-09-15).

Returns the top-N validators ranked by incentive for a specified Bittensor subnet, filtered to only validator_permit=true neurons.

## Facts

- Endpoint: GET https://api.carbon-cashmere.de/v1/bittensor-derivatives/subnet/:netuid/validators
- Price: $0.02/call
- Payment: x402
- Status: unknown
- Last checked: 2026-09-15
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/carbon-cashmere-bittensor-subnet-validator-rankings-api-9a8d45a0
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_qMKOOi3r9Y8USfUSTSBGP

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 carbon-cashmere-bittensor-subnet-validator-rankings-api-9a8d45a0
```

Example prompt: Show me the top validators ranked by incentive for Bittensor subnet 3, only the ones with validator permits.

## When to prefer this

Use this endpoint when you need pre-filtered, incentive-ranked validator data for a specific Bittensor subnet — especially when building validator selection logic or stake-delegation decision flows for TAO. Prefer this over raw Bittensor RPC calls when you want only validator_permit=true neurons ranked by incentive without doing your own filtering and sorting.

## Known failure modes

- Invalid netuid format (must be 0-511 integer) returns 400 or validation error
- Subnet not tracked by the API returns empty results or 404
- Payment not provided or insufficient USDC via x402 returns 402 Payment Required
- Network or upstream Bittensor node unavailable returns 503
- Rate limiting or quota exceeded returns 429

## How this service works

Top-N validators ranked by incentive for tracked Bittensor subnets. Filter only validator_permit=true neurons. AI agent API for validator-selection and stake-delegation decisions. Informational research data — not investment advice.

## Output

A ranked list of Bittensor validators for the specified subnet (netuid), filtered to only those with validator_permit=true, ordered by incentive score descending. Each entry typically includes validator hotkey, incentive score, stake, rank, and permit status. Informational only — not investment advice.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "$schema": "https://json-schema.org/draft/2020-12/schema",
 "required": [
  "input"
 ],
 "properties": {
  "input": {
   "type": "object",
   "required": [
    "type",
    "method"
   ],
   "properties": {
    "type": {
     "type": "string",
     "const": "http"
    },
    "method": {
     "enum": [
      "GET",
      "HEAD",
      "DELETE"
     ],
     "type": "string"
    },
    "pathParams": {
     "type": "object",
     "required": [
      "netuid"
     ],
     "properties": {
      "netuid": {
       "type": "string",
       "pattern": "^\\d{1,3}$",
       "examples": [
        "3",
        "64",
        "123"
       ],
       "description": "Bittensor subnet UID (0-511) as URL path segment."
      }
     },
     "additionalProperties": false
    },
    "queryParams": {
     "type": "object",
     "properties": {}
    }
   },
   "additionalProperties": false
  },
  "output": {
   "type": "object",
   "required": [
    "type"
   ],
   "properties": {
    "type": {
     "type": "string"
    },
    "example": {
     "type": "object"
    }
   }
  }
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/carbon-cashmere-bittensor-subnet-validator-rankings-api-9a8d45a0/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from api.carbon-cashmere.de](https://www.zero.xyz/host/api.carbon-cashmere.de/llms.txt)