Build with the Sinth API

Purchase prepaid credit, receive your key by email, and send your first message. No tenant setup is required.

From payment to first reply

1. Open Pricing, or create a checkout with POST /api/stripe/checkout.
2. Complete payment on the returned Stripe-hosted URL. Scions Tech is the payment brand.
3. Get your Sinth key from the purchase email. An agent needs access to that email or the key supplied by its owner. The checkout API does not return the key.
4. Call POST /api/v1/chat with your key and a message. Check GET /api/v1/usage before and after to confirm the charge.
5. Store the key on your application server. Give each of your users a distinct end_user value.

Available self-service endpoints

Pricing and current scope

Start with $10. Each successful starter-assistant reply costs $0.02. Chat errors with refunded: true return the debit. Top up using the same purchase email to retain your key and balance.

The self-service API provides a shared starter assistant with separate conversation histories for your users. It is not an OpenAI-compatible API and does not currently expose model selection, streaming, tool calling, or custom-agent inference. The site’s chat and voice demos are separate experiences; using them does not test your purchased key.

Broader bot-management, phone, voice, and administration capabilities require separately provisioned access. They are not unlocked by a prepaid Sinth key. Only the endpoints documented here are part of the current self-service contract.

Test keys work only in their test environment. Production checkout accepts real payments; do not enter test card numbers there.