# Bittensor Cross-Subnet Validator Inventory

> Bittensor Cross-Subnet Validator Inventory is a paid API for AI agents from api.carbon-cashmere.de, paid per call via x402, $0.02/call, status unknown (last checked 2026-09-14).

Returns validator count, total stake, and top-5 validators by trust score for every tracked Bittensor subnet, enabling voting-power concentration analysis.

## Facts

- Endpoint: GET https://api.carbon-cashmere.de/v1/bittensor/validators
- Price: $0.02/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-709f06f1
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_bJfvygw5F6PsZqB9B8vJj

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-709f06f1
```

Example prompt: Show me the top validators by trust score for every Bittensor subnet — I want to see how concentrated the voting power is, including each validator's stake, trust, and whether they're active.

## When to prefer this

Choose this endpoint when you need a cross-subnet view of Bittensor validator landscape in a single call — especially for stake concentration analysis, validator dominance monitoring, or governance research across all subnets. Prefer over per-subnet metagraph endpoints when breadth across all subnets matters more than deep per-neuron detail.

## Known failure modes

- No data for a subnet if it lacks persistent metagraph snapshots in the provider database
- Stale data possible if metagraph snapshot is not updated recently (check updated_at per subnet)
- Empty or partial top_5 list if fewer than 5 validators exist on a subnet
- Service unavailable or timeout if own Subtensor lite node is unreachable
- Payment failure if x402 micropayment of $0.02 USDC is not properly handled

## How this service works

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## Output

A JSON object keyed by subnet (netuid) where each entry contains: total validator count (n_validators), total staked TAO (total_validator_stake), timestamp of last update (updated_at), and an array of up to 5 top validators ranked by validator_trust, each with uid, stake, trust, validator_trust score, and active flag. Only subnets with persistent metagraph snapshots in the database are included.

## 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": {
  "by_subnet": [
   {
    "netuid": 3,
    "n_validators": 12,
    "total_validator_stake": 482000
   }
  ],
  "subnets_covered": 10,
  "total_validator_seats": 94
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/api-carbon-cashmere-de-709f06f1/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)