# Bitcoin Chain-Tip Reorg & Orphan Stream (Carbon Cashmere)

> Bitcoin Chain-Tip Reorg & Orphan Stream (Carbon Cashmere) is a paid API for AI agents from api.carbon-cashmere.de, paid per call via x402, $0.1/call, status unknown (last checked 2026-09-15).

Streams Bitcoin chain-tip orphan blocks and valid fork data by polling getchaintips every 10 minutes, flagging unusual reorg risk when branch_length >= 2

## Facts

- Endpoint: GET https://api.carbon-cashmere.de/v1/btc-derivatives/reorg-stream
- Price: $0.1/call
- Payment: x402
- Status: unknown
- Last checked: 2026-09-15
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/api-carbon-cashmere-de-5e7334ab
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_3dMAVvr7iwuFAHYVl2N--

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-5e7334ab
```

Example prompt: Pull the latest Bitcoin chain-tip reorg stream and let me know if there are any orphan blocks or active forks right now — especially flag anything with branch_length of 2 or more that would signal unusual reorg risk before we release settlement funds.

## When to prefer this

Use this endpoint when you need real-time Bitcoin chain-tip health data specifically for settlement safety decisions, exchange confirmation policy tuning, or cross-chain bridge finality windows. Prefer this over generic blockchain explorers when you need programmatic orphan/fork detection with structured branch_length data at a regular polling cadence for automated systems.

## Known failure modes

- Node polling lag if Bitcoin node is behind — data may be up to 10 minutes stale
- Upstream Bitcoin node unavailability could return empty or error response
- No reorg events present returns an empty or baseline-only stream
- Rate limiting or payment failure for x402 micropayment could block access

## How this service works

Bitcoin chain-tip orphan + valid-fork stream (10min cadence). For exchange confirmation-policy tuning, cross-chain bridge safety windows, finality auditors. branch_length >= 2 = unusual reorg risk.

## Output

Returns a stream of Bitcoin chain-tip entries including orphan blocks and valid forks detected via getchaintips polling (10-minute cadence), with branch_length values where branch_length >= 2 indicates elevated reorg risk. Useful for exchange confirmation-policy tuning, cross-chain bridge safety windows, and finality auditing.

## Request schema (JSON Schema)

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

## Response schema (JSON Schema)

```json
{
 "type": "json",
 "example": {
  "branches": [
   {
    "ts": "...",
    "status": "valid-fork",
    "tip_height": 941882,
    "branch_length": 2
   }
  ],
  "since_hours": 24,
  "branches_observed": 3,
  "max_depth_in_window": 2
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/api-carbon-cashmere-de-5e7334ab/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)