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Every Modulus API is a distinct service with its own host. All URLs below are sandbox. When you go live, request production credentials from support - you receive the production base URLs together with your production keys.

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Sandbox base URLs

The JavaScript SDK URL is a CDN, not an API host - load https://js.sbx.moduluslabs.io/v1 as a <script> tag. Its server-side companion (create a Payment Intent) uses the Ecom host above.
For each API’s authentication scheme, see its own Authentication page. A per-API auth summary is on the home page.