Get a Causilo API key
The free tier is enough to try Causilo on your own tables, and there is nothing to install on your side beyond the Python client.
The key is shown on the next page. Nothing is emailed, and your Google account is used only to confirm the address — we receive your email address and name and nothing else.
Continuing accepts the Terms of Service, version 2026-09. They are short, and the service is in beta: read them before you click rather than after. Your account records which version you accepted and when.
or tell us where to send it
Signing in with Google is the only way in at the moment, and it covers any address. We are not sending mail while our sending account is under review, and a form that quietly failed for most people was worse than no form. If you have no Google account, write to api@nums.world and we will issue one by hand.
What a free account includes
| Cells per month | 25,000,000 |
| Cells per day | 6,250,000 |
| Requests per minute | 60 |
| Requests per hour | 1,500 |
A cell is one value in a table you send, counting context and query rows together and excluding the target column. The hourly limit is the one a steady caller meets first: sixty a minute sustained would be three thousand six hundred an hour. Commercial use beyond these limits is by agreement; write to api@nums.world and tell us what you are running.