Reference

Changelog

v1 is this contract: 43 POST /api/v1 routes and the matching MCP tools on POST /mcp/v1. v1 is in beta until 2026-11-30. Until then it can still change, including breaking changes, announced first in the changelog. After the beta, a breaking change ships only as a new version.

What a compatible change may do

Add a route or a tool.
Add an optional input or an optional output field. Ignore fields you do not know.
Correct a value when the meaning of the field stays the one these pages describe.

A compatible change does not rename a field, change its type, its unit, its timezone, or its nullability, and it does not remove a route. A cursor from before a domain change stops working; that call is 422 and you start again without cursor. The page of rows is the same work, with a new cursor.

This v1

Discovery, fundamentals, volatility, range, gamma, chain, technical, and history, in that order.
Cursor paging. The caller does not set the page size.
The error envelope, the ET-minute rate limit, and POST /mcp/v1.
3 account reads, /api/v1/account/usage, /api/v1/account/clients, and /api/v1/account/status. They are also MCP tools: get_account_usage, get_account_clients, and get_account_status.

How later notes are written

markdown

## [v1.YYYY-MM-DD.N]
### Added
### Changed
### Fixed

Empty sections are omitted. Each bullet names the route, the tool, and the field. A security note does not include a payload or a secret.

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