# Carbon & Cashmere Subtensor Derivatives Events API

> Carbon & Cashmere Subtensor Derivatives Events 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 2026-09-09).

Retrieves on-chain events for a specific Subtensor (Bittensor) block number, including event IDs, module IDs, and event counts.

## Facts

- Endpoint: GET https://api.carbon-cashmere.de/v1/subtensor-derivatives/events/%7Bblock_number%7D
- Price: $0.02/call
- Payment: x402
- Status: unknown
- Last checked: 2026-09-09
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/carbon-cashmere-subtensor-derivatives-events-api-a7fe56e8
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_2XRoPkSNL7Z0pA_RpRurb

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-subtensor-derivatives-events-api-a7fe56e8
```

Example prompt: Pull all the on-chain events from Subtensor block 8204514 — I want to see the event IDs, which modules they came from, and the total event count for that block.

## When to prefer this

Use this endpoint when you need raw on-chain event data for a specific Bittensor/Subtensor block, particularly for auditing extrinsic outcomes, monitoring module activity, or building analytics on top of Subtensor derivative events. Prefer this over generic blockchain explorers when you want a pay-per-call, programmatic JSON feed without scraping.

## Known failure modes

- Block number not found or not yet finalized — may return empty events array or 404
- Invalid block_number format (non-integer) — likely 400 bad request
- Block number too far in the future — data unavailable
- Network connectivity issues to Subtensor node — 503 or timeout
- Payment not received — 402 Payment Required before data is returned

## How this service works

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## Output

A JSON object containing an array of events (each with event_id, event_idx, and module_id), the total event_count, and the queried block_number — e.g. 120 events across System and other modules for block 8204514.

## Request schema (JSON Schema)

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

## Response schema (JSON Schema)

```json
{
 "type": "json",
 "example": {
  "events": [
   {
    "event_id": "ExtrinsicSuccess",
    "event_idx": 0,
    "module_id": "System"
   }
  ],
  "event_count": 120,
  "block_number": 8204514
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/carbon-cashmere-subtensor-derivatives-events-api-a7fe56e8/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)