Changelog

Changes to the API and the indicators. Any change that could break your integration is announced here before it ships.

Our commitment

• /v1 is the only version of the API. Backward-compatible additions (a new indicator, a new optional field, a new route) do not bump the version: just ignore fields you do not know.
• A breaking change (an indicator’s calculation, a message format) is announced on this page before its effective date.
• On that date, every subscription receives a reset (reason engine_change) followed by a new, recomputed snapshot. Cursors received before that reset can no longer be used to resume.

v1 · upcoming

First public release.

• Real time over WebSocket: multiple subscriptions per connection, initial snapshot, exact resume after a disconnect. See Real time.
• History: paginated queries with cost estimates, and subscriptions that start in the past and then continue live. See History.
• Exports of long ranges, resumable after a disconnect. See Exports.
• 10 indicators: Fathom Trades, Fathom Footprint, Fathom Zones, Fathom Walls, Fathom Flow, Fathom Imbalances, Fathom VWAP, Fathom Levels, Fathom Profile and Fathom Opening.
• TypeScript SDK @fathom-charts/sdk, for Node and the browser, with types generated from the catalog. See Quickstart.
• Offers: Sandbox (free), Live (real time, monthly subscription) and Historical (one-time purchase, lifetime access), paid through Stripe in France and through Creem everywhere else. See Plans and billing.
• Account page: sign-up and sign-in with an e-mailed link, API keys, offer purchases, Live cancellation and monthly usage. See My account.