The measurements, as data
Everything published here is available as JSON, under the same licence and with the same caveats as the pages. No key, no rate limit, no sign-up — attribution and a link back are the whole arrangement.
Endpoints
| Endpoints | Contains | Size |
|---|---|---|
| /api/snapshot.json | Availability, latency percentiles, clock offset, market-data age, incidents and daily availability, per venue. | 8 KB |
| /api/funding.json | Funding rates for 1001 perpetuals across 8 venues, annualised from each venue's own settlement interval, with that interval and where it came from. | 3.5 MB |
| /api/slippage.json | The modelled cost of walking the visible order book at four notional sizes, per venue and symbol, with the fill fraction. | 87 KB |
Terms
Licensed CC BY 4.0: use it commercially, modify it, redistribute it, as long as https://excxh.com is credited with a link. Files are rebuilt on the same schedule as the site, so poll no more often than that — every field carries the timestamp it was measured at, and a number quoted without one is not something we can stand behind.
Stability
Field names are additive: new ones appear, existing ones keep their meaning. If a field has to change meaning it gets a new name and the old one stays until nothing reads it. Breaking changes are announced in the feed before they ship.
Before you build on it
These are measurements from one vantage point, not a market data feed. Read Method before using them for anything that matters — particularly the parts about what a single observation point can and cannot establish.