# Carbon & Cashmere Bittensor Subnet Metagraph API

> Carbon & Cashmere Bittensor Subnet Metagraph API 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 the full metagraph snapshot for a specific Bittensor subnet, including per-neuron stake, incentive, and summary statistics.

## Facts

- Endpoint: GET https://api.carbon-cashmere.de/v1/bittensor-derivatives/subnet/%7Bnetuid%7D/metagraph
- 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/carbon-cashmere-bittensor-subnet-metagraph-api-ea78a8be
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_i8edZpXgOBamt3zWfnOXJ

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-metagraph-api-ea78a8be
```

Example prompt: Pull the full metagraph snapshot for Bittensor subnet 18 — I want to see all the neurons with their stake and incentive scores, plus the summary stats like total stake, validator count, and Gini incentive.

## When to prefer this

Use this endpoint when you need a full, structured metagraph snapshot for a specific Bittensor subnet — including per-neuron stake and incentive data plus aggregate summary stats — rather than just top-N miners. Ideal for monitoring subnet health, computing custom analytics, or auditing decentralized AI network state.

## Known failure modes

- Invalid or non-existent netuid returns an error or empty neuron list
- Network timeout if Bittensor chain data is temporarily unavailable
- 402 Payment Required if USDC payment header is missing or insufficient
- Malformed netuid path parameter causes a 400 or 404 response

## How this service works

Professional crypto market intelligence. Real-time prices, signals, and market scoring.

## Output

Returns a JSON object with a timestamp, the subnet ID (netuid), an array of neuron objects (each with uid, stake, and incentive), and a summary block containing active neuron count, total neuron count, total stake, validator count, and Gini incentive coefficient.

## Request schema (JSON Schema)

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

## Response schema (JSON Schema)

```json
{
 "type": "json",
 "example": {
  "ts": "...",
  "netuid": 1,
  "neurons": [
   {
    "uid": 248,
    "stake": 686148,
    "incentive": 0.95
   }
  ],
  "summary": {
   "n_active": 27,
   "n_neurons": 256,
   "total_stake": 2524974.5,
   "n_validators": 10,
   "gini_incentive": 0.84
  }
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/carbon-cashmere-bittensor-subnet-metagraph-api-ea78a8be/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)