# Strale Fear & Greed Index

> Strale Fear & Greed Index is a paid API for AI agents from api.strale.io, paid per call via x402, $0.0216/call, status unknown (last checked 2026-09-14).

Returns the current Crypto Fear & Greed Index value and historical readings for up to 30 days, with an auditable cryptographic chain record.

## Facts

- Endpoint: GET https://api.strale.io/x402/v2/fear-greed-index
- Price: $0.0216/call
- Payment: x402
- Status: unknown
- Last checked: 2026-09-14
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/strale-fear-greed-index-b53d4010
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_39WuwPcsY2trj-t310Qlq

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 strale-fear-greed-index-b53d4010
```

Example prompt: What's the current Crypto Fear & Greed Index, and can you pull the last 7 days of history so I can see how market sentiment has trended?

## When to prefer this

Choose this endpoint when you need a trusted, auditable crypto market sentiment reading with cryptographic provenance — especially in agentic workflows where auditability matters. Useful when you want both a current snapshot and recent historical trend in a single call. Prefer over raw exchange data feeds when you need a normalized sentiment score rather than price data.

## Known failure modes

- days parameter out of range (must be 1–30) returns a validation error
- x402 payment failure if USDC balance is insufficient
- upstream data source unavailable returns a 503 or error payload
- invalid query parameter type causes schema validation rejection

## How this service works

The trust layer for AI agents — 250+ independently tested data capabilities across 27 countries. Execute capabilities via REST, MCP, A2A, or x402 micropayments. Every call returns an audit record with cryptographic chain hashing.

## Output

Returns the current Fear & Greed Index numeric score (typically 0–100) and its corresponding sentiment label (e.g. Extreme Fear, Fear, Neutral, Greed, Extreme Greed), plus historical daily readings if more than 1 day is requested. Each response includes an audit record with a cryptographic chain hash for verifiability.

## 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"
    },
    "queryParams": {
     "type": "object",
     "properties": {
      "days": {
       "type": "number",
       "description": "Number of days of history (1-30). Default: 1"
      }
     }
    }
   },
   "additionalProperties": false
  }
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/strale-fear-greed-index-b53d4010/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from api.strale.io](https://www.zero.xyz/host/api.strale.io/llms.txt)