# Authentication

Passkey-based authentication flow (SSE).

## Start a passkey authentication flow (SSE)

> Initiates a passkey-based sign-in. Returns a \`text/event-stream\` (SSE) that emits events until the user authenticates or the 2-minute timeout expires.\
> \*\*Event sequence:\*\*\
> 1\. \`pending\` — contains the \`passkey\` and an \`auth\_url\` to open. 2. \`success\` — contains \`access\_token\` and \`refresh\_token\`.\
> The stream closes automatically after \`success\` or timeout.<br>

````json
{"openapi":"3.1.0","info":{"title":"UI Color Palette API","version":"1.0.0"},"tags":[{"name":"Authentication","description":"Passkey-based authentication flow (SSE).\n"}],"servers":[{"url":"https://api-uicp.yelbolt.workers.dev/v1","description":"Production"}],"paths":{"/authenticate":{"get":{"operationId":"authenticate","summary":"Start a passkey authentication flow (SSE)","description":"Initiates a passkey-based sign-in. Returns a `text/event-stream` (SSE) that emits events until the user authenticates or the 2-minute timeout expires.\n**Event sequence:**\n1. `pending` — contains the `passkey` and an `auth_url` to open. 2. `success` — contains `access_token` and `refresh_token`.\nThe stream closes automatically after `success` or timeout.\n","tags":["Authentication"],"responses":{"200":{"description":"SSE stream","content":{"text/event-stream":{"schema":{"type":"string","description":"Each `data:` line is a JSON object. Possible shapes:\n**Pending event:** ```json {\n  \"status\": \"pending\",\n  \"passkey\": \"abc123\",\n  \"auth_url\": \"https://auth.ui-color-palette.com/?passkey=abc123\",\n  \"message\": \"Please authenticate by opening the following URL in your browser: ...\"\n} ```\n**Success event:** ```json {\n  \"status\": \"success\",\n  \"access_token\": \"<supabase-jwt>\",\n  \"refresh_token\": \"<refresh-token>\"\n} ```\n"}}}},"502":{"description":"Failed to reach the passkey service","content":{"application/json":{"schema":{"$ref":"#/components/schemas/ErrorResponse"}}}}}}}},"components":{"schemas":{"ErrorResponse":{"type":"object","required":["message"],"properties":{"message":{"type":"string"}}}}}}
````


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