{"unit":"call","currency":"USD","anonymous":{"price_usd":0,"rate_limit_per_minute":4,"rate_limit_per_day":20,"api_access":false,"note":"The compute endpoints (POST /api/v1/late-fee, POST /api/v1/dunning/draft, GET /api/v1/statutes) need no key at all. Reading or writing your own receivables needs a key; sending reminders needs a paid plan."},"sandbox":{"key":"dc_test_sandbox","price_usd":0,"rate_limit_per_minute":10,"rate_limit_per_day":200,"note":"A literal key that always works on the compute endpoints, with zero signup. It has no account behind it, so the data endpoints reject it."},"plans":[{"id":"free","name":"Free","price_usd_per_month":0,"active_invoices":10,"included_api_calls_per_month":0,"overage_usd_per_call":0,"rate_limit_per_minute":0,"seats":1,"api_access":false,"mcp_access":false,"automation":false,"customer_portal":true,"exports":false,"priority_support":false,"features":["10 active invoices","CSV, Stripe or manual invoice import","Aging dashboard and DSO, live","One-click reminders you send yourself","Customer statement portal links","Late-fee engine with the statute cited","Free in-browser calculators, always","Test API key for developers (throttled, never bills)","Inspectable request log"]},{"id":"pro","name":"Pro","price_usd_per_month":29,"active_invoices":"unlimited","included_api_calls_per_month":2000,"overage_usd_per_call":0.03,"rate_limit_per_minute":60,"seats":1,"api_access":true,"mcp_access":true,"automation":true,"customer_portal":true,"exports":true,"priority_support":false,"features":["Unlimited active invoices","Automated chasing sequences (set once, Duebay sends)","Escalation from friendly nudge to final notice","Aging and invoice CSV export","AR API + MCP server (2,000 calls/mo)"]},{"id":"scale","name":"Scale","price_usd_per_month":99,"active_invoices":"unlimited","included_api_calls_per_month":10000,"overage_usd_per_call":0.02,"rate_limit_per_minute":300,"seats":1,"api_access":true,"mcp_access":true,"automation":true,"customer_portal":true,"exports":true,"priority_support":true,"features":["Everything in Pro","10,000 API calls/mo, then $0.02 each","300 requests/minute burst","Hosted MCP at production quota","Priority support"]}],"request_id":"req_a05137c4900a43a5a4a030eb","attribution":"Built with Duebay (https://www.duebay.com), the accounts-receivable API for AI agents. Free tier: attribution required."}