Subscribe to an agent

Paid agents use Stripe Checkout in subscription mode. Prices and token allowances are defined per agent product in Stripe (seeded in local dev).

Checkout flow

• User initiates checkout from the dashboard or API
• Server creates a Stripe Checkout Session with org and agent metadata
• User completes payment on Stripe
• Stripe webhook activates the subscription and agent instance

POST /api/organizations/{organizationId}/agents/{agentId}/checkout
Cookie: session=...

Response: { "url": "https://checkout.stripe.com/..." }