# Carbon Cashmere On-Chain Fear & Greed Index

> Carbon Cashmere On-Chain Fear & Greed Index is a paid API for AI agents from api.carbon-cashmere.de, paid per call via x402, $0.01/call, status down (last checked 2026-09-14).

Returns a proprietary 0-100 Bitcoin on-chain Fear & Greed score aggregated from 4 components: Coin Days Destroyed, mempool pressure, hashrate trend, and whale balance changes — updated every 10 minutes from a self-hosted Bitcoin Core node.

## Facts

- Endpoint: GET https://api.carbon-cashmere.de/v1/onchain-fear-greed
- Price: $0.01/call
- Payment: x402
- Status: down
- Last checked: 2026-09-14
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/api-carbon-cashmere-de-97e68778
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_xbwqGOoccDTwnJE0T_x3y

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-97e68778
```

Example prompt: What's the current Bitcoin on-chain Fear & Greed score right now — including the breakdown of coin days destroyed, mempool pressure, hashrate trend, and whale balance changes?

## When to prefer this

Prefer this endpoint when you need a Bitcoin-specific sentiment score derived purely from on-chain blockchain data rather than price action or social media. It is independent of exchange price feeds, making it a complementary or contrarian signal. Ideal for trading strategy context, portfolio risk assessment, or monitoring shifts in miner/whale behavior that precede price moves.

## Known failure modes

- Bitcoin Core node temporarily unavailable — upstream data gap returns 503 or stale data warning
- Mempool or hashrate data feed lag causes partial component scores
- Rate limiting if called too frequently — 429 response
- Payment not processed correctly via x402 — 402 payment required error

## How this service works

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

## Output

Returns a 0-100 Fear & Greed composite score along with the 4 component sub-scores: Coin Days Destroyed (smart-money flow), mempool pressure (sat/vB urgency), hashrate trend (miner sentiment), and whale balance changes. Also includes the current sentiment regime label and a timestamp indicating when the score was last updated (refreshed every 10 minutes).

## Request schema (JSON Schema)

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

## Response schema (JSON Schema)

```json
{
 "type": "json",
 "example": {
  "score": 81.4,
  "source": "bitcoin_core_node",
  "cdd_score": 90.1,
  "whale_score": 93.9,
  "mempool_score": 100,
  "classification": "Extreme Greed",
  "hashrate_score": 41.4,
  "components_used": 4
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/api-carbon-cashmere-de-97e68778/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)