Isometric Registry API
The Isometric Registry API provides programmatic access to the public record of carbon removal credits certified to the Isometric Standard. Versioned at /v0, it exposes resources for suppliers, organisations, beneficiaries, transferees, projects, issuances, credit batches, orders, deliveries, transfers, retirements, refunds, and buffer pools, plus Stripe-backed checkout for self-service payments. Authentication requires both an X-Client-Secret header tied to a sandbox or production environment and a JWT bearer access token scoped to a single organisation. Pagination follows the Relay cursor specification, dates are ISO 8601 UTC, and countries use ISO 3166-1 Alpha-3. Third-party integrators including marketplaces, intermediaries, and carbon intelligence platforms can request Registry API access.
Isometric Registry API is one of 3 APIs that Isometric publishes on the APIs.io network, described by a machine-readable OpenAPI specification.
Tagged areas include Carbon Removal, Carbon Registry, Credits, Issuances, and Deliveries. The published artifact set on APIs.io includes API documentation, authentication docs, an OpenAPI specification, and a changelog.