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Checkbook REST API v3.0

The API sends and receives funds without checks. Additionally, the API can enable custom 'marketplaces' for onboarding buyers and sellers. Marketplaces could be used for landlords, freelancers, or building an accounting platform. provides an API Key and an API Secret with demo, sandbox, and production environments to authenticate and make calls to the API. Postman collection available. aims to eliminate paper checks.