# BlockRun.AI Fear & Greed Index History

> BlockRun.AI Fear & Greed Index History is a paid API for AI agents from blockrun.ai, paid per call via x402, $0.0075/call, status unknown (last checked 2026-09-13).

Returns historical Fear & Greed index data for the cryptocurrency market

## Facts

- Endpoint: GET https://blockrun.ai/api/v1/surf/market/fear-greed
- Price: $0.0075/call
- Payment: x402
- Status: unknown
- Last checked: 2026-09-13
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/blockrun-ai-968745e2
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_hrpvI9d9YadS5pJnHeqfJ

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 blockrun-ai-968745e2
```

Example prompt: Can you pull up the historical Fear & Greed index for the crypto market so I can see how sentiment has shifted over time?

## When to prefer this

Use this endpoint when you need historical Fear & Greed index data for the crypto market, especially within a crypto-native analytics stack on blockrun.ai. Prefer this over general sentiment APIs when you want time-series sentiment history tied to cryptocurrency market cycles.

## Known failure modes

- Service unavailable or rate limit exceeded (HTTP 429/503)
- Payment not processed or insufficient funds (x402 payment required)
- Empty or truncated response if data is unavailable for the requested period
- Malformed response if upstream data source is down

## How this service works

Pay for the outcome. One endpoint for every model, tool and data source an agent needs — each call priced before it runs, at the best value per dollar. 103 models and 100 data and tool APIs.

## Output

Returns a historical series of Fear & Greed index values for the cryptocurrency market, including sentiment scores and associated timestamps, allowing analysis of how market emotion has trended over time.

## Example request

```json
{
 "input": {
  "body": {}
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/blockrun-ai-968745e2/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from blockrun.ai](https://www.zero.xyz/host/blockrun.ai/llms.txt)