# Bittensor Cross-Subnet Top Validators Leaderboard

> Bittensor Cross-Subnet Top Validators Leaderboard is a paid API for AI agents from api.carbon-cashmere.de, paid per call via x402, $0.05/call, status unknown (last checked 2026-09-14).

Returns a ranked leaderboard of top-N validators aggregated across all 13 tracked Bittensor focus subnets in a single call.

## Facts

- Endpoint: GET https://api.carbon-cashmere.de/v1/bittensor-derivatives/top-validators-cross-subnet
- Price: $0.05/call
- Payment: x402
- Status: unknown
- Last checked: 2026-09-14
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/api-carbon-cashmere-de-a754b584
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_SVBafiDAAe6XMqrXz-tHp

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 api-carbon-cashmere-de-a754b584
```

Example prompt: Give me the top validators ranked across all 13 tracked Bittensor subnets right now so I can decide where to allocate my stake.

## When to prefer this

Use this endpoint when you need a unified, single-call view of top validators spanning multiple Bittensor subnets simultaneously, rather than querying each subnet individually. Ideal for cross-subnet stake allocation decisions, validator research, and network-wide dominance analysis across the 13 curated focus subnets.

## Known failure modes

- Subtensor node connectivity issues returning stale or empty data
- Partial subnet data if one or more subnets are temporarily unavailable
- Rate limiting or payment failure returning 402/429 errors
- Truncated response if validator set is very large
- Subnet data lag if block production is slow

## How this service works

Top-N validators per tracked Bittensor subnet, aggregated across all 13 focus subnets. One call returns the leaderboard across subnets. For cross-subnet validator-research and stake-allocation decisions.

## Output

A cross-subnet leaderboard listing the top-N validators for each of the 13 tracked Bittensor focus subnets, aggregated into a single response. Likely includes validator identifiers, stake amounts, trust/incentive scores, and subnet identifiers enabling side-by-side comparison across subnets for stake-allocation research.

## Example request

```json
{
 "input": {
  "type": "http",
  "method": "GET",
  "queryParams": {}
 }
}
```

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "properties": {
  "properties": {
   "type": "string"
  }
 }
}
```

## Response schema (JSON Schema)

```json
{
 "type": "json",
 "example": {
  "data": [
   {
    "netuid": 1,
    "top_validators": [
     {
      "uid": 248,
      "stake": 686148,
      "incentive": 0.95
     }
    ]
   }
  ],
  "subnets_covered": 13,
  "limit_per_subnet": 5
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/api-carbon-cashmere-de-a754b584/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)