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| /api/series | Without a key | With a key |
|---|---|---|
| Requests a minute | 30 per IP | 120 per key |
| Points per response | 1500 | 6000 |
| Longest range | 730 days (10 years for long/short and funding) | 10 years, every metric |
Send the key as an X-API-Key header. ?api_key= also works but is discouraged: URLs end up in logs and browser history, and those responses are never cached (Cache-Control: private, no-store). An unknown or revoked key gets a 401; without a key nothing changes. At most 3 keys a day per address. Terms: free, no SLA, attribution when you publish, no resale of the data; see the API docs.