Docs

Graphtr has two programmatic surfaces. Render is a REST API that returns image bytes. Relay is an MCP server that lets an agent design directly. Both go through the same template library and the same renderer.

• QuickstartYour first design in about two minutes.
• API referenceEndpoints, parameters and error codes for Render.
• MCPAdd Relay to an MCP client and what the four tools do.

Authentication

Both surfaces use an API key sent as a bearer token. Keys are created in your account, carry only the scopes you grant, and stop working the moment you revoke them. A key is shown once when created and stored hashed, so it cannot be recovered later.

Limits

Usage is counted per rendered design, per month, with an allowance on every plan including free. Listing templates and reading your usage do not count against it. Every response carries the remaining allowance in its headers.