Crypto Fear and Greed Index

Read the Crypto Fear and Greed Index from 0 to 100, with its sentiment label, update time and up to 30 days of history.

Pay by wallet (x402) fear-greed-index

Example

Example answer

{
  "timestamp": "2026-04-03T00:00:00.000Z",
  "current_value": 9,
  "classification": "Extreme Fear"
}

Inputs

Field	Type	Required	What it is
`days`	number	No	Number of days of history (1-30). Default: 1

Output fields

How reliably each field appears in a successful answer.

Field	Type	Appears
`trend`	string	Usually (present for most inputs)
`average`	number	Usually (present for most inputs)
`history`	array	Usually (present for most inputs)
`timestamp`	string	Usually (present for most inputs)
`attribution`	string	Always (present in every successful answer)
`current_value`	number	Usually (present for most inputs)
`classification`	string	Usually (present for most inputs)

How to call it

The same tool through each route. MCP clients reach it through Strale’s server at https://api.strale.io/mcp; the call below is what the agent sends.

# Needs an API key. max_price_cents caps what this call may cost.
curl -X POST https://api.strale.io/v1/do \
  -H "Authorization: Bearer $STRALE_API_KEY" \
  -H 'Content-Type: application/json' \
  -d '{
    "capability_slug": "fear-greed-index",
    "inputs": {},
    "max_price_cents": 2
  }'

{
  "tool": "strale_execute",
  "arguments": {
    "slug": "fear-greed-index",
    "inputs": {},
    "max_price_cents": 2
  }
}

import { Strale } from "straleio";

const strale = new Strale({ apiKey: process.env.STRALE_API_KEY! });
const result = await strale.do({
  capability_slug: "fear-greed-index",
  inputs: {},
  max_price_cents: 2,
});

import os
from straleio import Strale, DoRequest

strale = Strale(api_key=os.environ["STRALE_API_KEY"])
result = strale.do(DoRequest(
    capability_slug="fear-greed-index",
    inputs={},
    max_price_cents=2,
))

# No account. The first request answers 402 with the price in USDC;
# an x402 client pays it from your wallet and repeats the request.
curl -i 'https://api.strale.io/x402/v2/fear-greed-index?'

Limitations

Output reflects Alternative.me (Crypto Fear & Greed Index) at query time. Dependent on upstream API availability; may degrade if the provider rate-limits or is temporarily unavailable.