CANDI — Merchant of Record & billing for modern software

Everything to sell software

One platform from checkout to payout. A complete billing stack behind a single API, unified under one merchant of record.

The same primitives Stripe, Paddle and Lemon Squeezy give you — plus the tax and compliance burden taken off your company entirely.

Hosted & embedded checkout

Drop-in checkout on your own domain, or embed it as a modal or inline iframe. Cards, wallets, and a redirect flow with signed returns.

Subscriptions

Trials, proration on upgrade or downgrade, pause/resume, seat-based billing, and automatic dunning with retry schedules.

License keys

Issue keys on purchase, activate and validate per device with activation limits and expiry — no extra service to run.

Usage credits

Prepaid wallets and metered billing with durable idempotency — perfect for AI tokens, API calls and loyalty points.

Global tax, handled

As merchant of record we calculate, collect and remit VAT, GST and US sales tax, and issue compliant invoices in our name.

Signed webhooks

HMAC-signed events with automatic retries, a full delivery log and one-click resend. Build your fulfilment on real-time truth.

Revenue splits & affiliates

Split every sale across co-founders, partners or an affiliate program automatically, settled on the same payout schedule.

Payouts

A double-entry ledger tracks every cent; twice-monthly payouts land the net in your account with self-billed invoices.

Analytics & MRR

Live revenue, MRR and customer metrics in a clean dashboard, plus a metrics API for your own reporting.

By the numbers

The plumbing under every sale. One rate, two isolated data planes, and a double-entry ledger that has to balance before a payout leaves.

Verifiable properties of the platform — not traction claims. CANDI is new; we would rather show you the mechanics than a logo wall.

3.9% + $0.40

Per successful transaction. No monthly fee, no setup, no minimum.

2

Physically separate databases for live and test — mode isolation, not a flag.

12

HMAC-signed webhook events, with retries, a delivery log and one-click resend.

0

Tax registrations you need. We are the merchant of record, so they are ours.

Built for developers and agents

Reliable, contract-first infrastructure. One OpenAPI contract, test mode with isolated keys, an MCP server, and SDKs that mirror what you already know.

View the API docs View SKILL.md

Connect to what you already run. Take a payment, and CANDI settles tax, invoicing, licensing, credits and the payout behind it — you listen on one webhook.

Your app Your AI agent

Hosted checkout MCP · dtc_* tools

CANDI

Tax & invoice Ledger License · credits

Signed webhook Payout

Two calls to a paid customer. Open a checkout, then fulfil on the signed event — the tax, the invoice and the payout are ours to run.

# 1 — open a checkout
curl -X POST https://api.usecandi.com/v1/checkouts \
  -H "x-api-key: candi_test_…" \
  -d '{"product_id":"prod_…","success_url":"https://yourapp.com/done"}'
→ { "url": "https://checkout.usecandi.com/chk_…" }

# 2 — fulfil on the signed webhook (candi-signature: HMAC_SHA256)
POST /your/webhook   checkout.completed
→ grant access. payouts land twice monthly.

How it works

Live in an afternoon. Contract-first REST API, test mode with isolated keys, and SDKs that mirror what you already know.

Create a product

Define a one-time or recurring product with pricing, tax category and any license, file or credit features.

Open a checkout

Call the API for a hosted checkout URL, or embed it. We handle payment, tax and the compliant invoice.

POST /v1/checkouts
→ checkout.usecandi.com/{id}

Fulfil on the webhook

Listen for checkout.completed, verify the signature, and grant access. Payouts arrive automatically.

Pricing

One rate. No surprises. No monthly fee, no setup fee, no minimums — you only pay when you get paid.