# Carbon & Cashmere Bittensor Subnet Snapshot API

> Carbon & Cashmere Bittensor Subnet Snapshot 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 a per-subnet snapshot for any Bittensor mainnet subnet, combining static metadata (modality, owner, burn, kappa, rho) with the latest Tier-A metrics and current alpha-token price.

## Facts

- Endpoint: GET https://api.carbon-cashmere.de/v1/bittensor-derivatives/subnet/:netuid
- 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-snapshot-api-0e9ab2ed
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_SxLcMRxXHDZT2B4MvnEcr

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-snapshot-api-0e9ab2ed
```

Example prompt: Pull the full subnet snapshot for Bittensor subnet 64 — I want the static metadata like modality, owner, burn, kappa, and rho, plus the latest Tier-A metrics and the current alpha-token price.

## When to prefer this

Use this endpoint when you need a complete, single-call snapshot of a specific Bittensor subnet including both its immutable registration parameters and live market data (alpha-token price and Tier-A metrics). Prefer this over general crypto price APIs when the subject is Bittensor subnet-level intelligence rather than top-level TAO price, and over blockchain explorers when you need pre-aggregated Tier-A metrics without raw chain parsing.

## Known failure modes

- Invalid netuid format (non-numeric or out of range) returns a 400 or validation error
- Netuid corresponds to an inactive or non-existent subnet, returning empty or 404 response
- Payment failure via x402 protocol results in 402 Payment Required
- Temporary upstream data unavailability may return stale or partial metrics
- Rate limiting if too many calls are made in quick succession

## How this service works

Per-subnet Bittensor snapshot: static metadata (modality/owner/burn/kappa/rho) + latest Tier-A metrics + current alpha-token price. Covers all 129 mainnet subnets.

## Output

A JSON snapshot for the requested subnet containing: static metadata fields (modality, owner address, burn rate, kappa, rho), the latest Tier-A performance metrics, and the current alpha-token price. Covers all 129 active mainnet subnets (netuid 0–511 range).

## 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-snapshot-api-0e9ab2ed/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)