Prismatic API/Docs/Authentication
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Authentication

Most public endpoints require a Prismatic API key. OpenAI-style clients use Authorization: Bearer; Anthropic-style clients can use x-api-key plus anthropic-version.

Standard header

Use this header for OpenAI-compatible endpoints and direct HTTP clients that expect bearer authentication.

Bash
Authorization: Bearer pa_YOUR_KEY

Anthropic-compatible header

Use this header set for POST /v1/messages and POST /v1/messages/count_tokens when your client speaks the Anthropic protocol.

Bash
x-api-key: pa_YOUR_KEY
anthropic-version: 2023-06-01

Where to get your key

Open the Prismatic dashboard, go to API Keys and generate a customer API key. Keep the full key secret; only the prefix is safe to display in logs or UI.

Best practices

  • Keep keys server-side whenever possible.
  • Rotate keys immediately if a client, screenshot or repository exposes one.
  • Use one key per environment or integration when practical.
  • Handle 401 authentication errors separately from 402 billing and 429 rate-limit responses.
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