> ## Documentation Index
> Fetch the complete documentation index at: https://developers.thinkout.io/llms.txt
> Use this file to discover all available pages before exploring further.

# API overview

> Conventions shared by every endpoint.

|                |                                                                                                  |
| -------------- | ------------------------------------------------------------------------------------------------ |
| Base URL       | `https://api.thinkout.io/v1`                                                                     |
| Authentication | `Authorization: Bearer <api key>`, one key per workspace                                         |
| Format         | JSON, `snake_case` keys, UTF-8                                                                   |
| Ids            | UUID strings                                                                                     |
| Money          | Signed decimal strings plus an ISO 4217 `currency`                                               |
| Dates          | `YYYY-MM-DD`; timestamps in RFC 3339 UTC                                                         |
| Lists          | `{ object, data, has_more, next_cursor }`, `limit` up to 500                                     |
| Errors         | `{ error: { type, code, message, param, request_id } }`                                          |
| Reports        | `/transactions/summary` and `/balances` return totals computed with the cash flow screen's rules |

## Versioning

The version is in the path. Within `v1` we only make additive changes: new fields, new enumeration values, new optional filters, new endpoints. Removing or renaming a field, changing a type, or changing the meaning of an existing filter would ship as `v2` with `v1` kept running for at least twelve months.

Ignore fields you do not recognise and treat unknown enumeration values as opaque.

## Playground

Every endpoint page has a playground. Paste an API key in the authorization field to run requests against your own workspace. Keys are kept in your browser only.