Futures Fear & Greed API & MCP

Read the current Bitcoin futures Fear & Greed Index, daily history and methodology using a public JSON API or MCP server.

Public, read-only access without an API key. Requests use the existing cached dataset. Please cache results for 10 minutes. This service makes no OpenAI or Anthropic model calls.

JSON API

• GET /api/v1/index?lang=en — current index
• GET /api/v1/history?limit=31&lang=en — daily history, newest first
• GET /api/v1/methodology — methodology

curl 'https://futuresfeargreed.com/api/v1/index?lang=en'

curl 'https://futuresfeargreed.com/api/v1/history?from=2026-10-01&to=2026-10-18&limit=31&lang=en'

History parameters: from/to are inclusive UTC dates (YYYY-MM-DD); limit is 1–366, default 31; offset is 0–100000, default 0. next_offset is null at the end. lang accepts de or en. Missing readings stay null. Unknown or repeated parameters return HTTP 400.

MCP

Streamable HTTP: https://futuresfeargreed.com/mcp

• ffg_get_current_index
• ffg_get_history
• ffg_get_methodology

Add this URL in an MCP-compatible client supporting remote HTTP servers. Connection options depend on the client and plan. Hosting this endpoint does not automatically install it in ChatGPT or Claude or guarantee search citations.

Freshness and availability

Read updated_at, date, stale, quality, methodology_version and each component’s asOf, observedAt, periodDays and status. updated_at/current/stale describe the calculation, not the freshness of every source. closed and pending follow source publication schedules; stale and unavailable mark source problems. value=null is unavailable, never neutral. The running UTC day can change. Outages may return the last saved dataset or HTTP 503. New API/MCP routes share a service-wide limit of 600 requests per minute; HTTP 429 includes Retry-After. There is no uptime guarantee.

History and attribution

These historical readings are recalculated from currently available source data. They are not the values originally published on each day. Source corrections can revise past readings. The current UTC day is provisional; a missing value is not zero.

When quoting, name Smart Money Futures Fear & Greed Index, link source_url and include date and updated_at. The index describes positioning, not a crash probability. This interface does not grant redistribution rights to external providers’ raw data.