TrimCarbon Offset API
Buy carbon offsets from your own systems, paid from a prepaid balance.
The Offset API lets your company buy carbon credits from its own systems: a nightly job that offsets yesterday’s fuel use, a script that offsets each shipment, or a button in your internal tools.
How it works
- You request API access on the developer page. We review each request; the API is for businesses that offset their own emissions.
- You top up a prepaid USD balance through Stripe Checkout, from $250. Each top-up comes with an invoice.
- You buy offsets with
POST /offsets, by volume (kg) or by price (amount_cents). The cost comes out of your balance at your rate per kg. - We buy and retire the credits through our supplier, usually within minutes. The offset then shows as
placed, with a link to its public certificate.
Base URL
https://trimcarbon.com/api/v1All requests and responses are JSON. Amounts are in US cents, volumes in whole kg of CO₂.
Keys
| Key | Spends | Retires credits |
|---|---|---|
tc_live_… |
Your real balance | Yes |
tc_test_… |
A simulated balance | No |
A key is either read only or read and buy. See Authentication.
Next steps
- Quickstart: your first purchase with a test key.
- Idempotency: retry safely, never buy twice.
- API reference: every endpoint, with a playground.