Public endpoint — no API key required when called from a browser
embed. The project is resolved via the
X-NeuralDraft-Project-Key header (recommended for server-side calls)
or ?project_id=<id> query param (browser embeds where you can’t
ship a secret key). Idempotent — re-submitting an existing email
returns 200 with status="already_subscribed" rather than an error.
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Documentation Index
Fetch the complete documentation index at: https://docs.neuraldraft.io/llms.txt
Use this file to discover all available pages before exploring further.
Project API key (alternative to query param).
Project ID for unauthenticated browser embeds.
Email already subscribed (idempotent).