> For the complete documentation index, see [llms.txt](https://docs.sprinthub.com/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.sprinthub.com/en/topics/api.md).

# API

- [API - How to register the API key](https://docs.sprinthub.com/en/topics/api/api-how-to-register-the-api-key.md)
- [API - API Call to create/update an Opportunity in CRM](https://docs.sprinthub.com/en/topics/api/api-api-call-to-create-update-an-opportunity-in-crm.md)
- [API - API Call to List a Lead's Opportunities](https://docs.sprinthub.com/en/topics/api/api-api-call-to-list-a-leads-opportunities.md)
- [API - API Call to update Lead UTMs](https://docs.sprinthub.com/en/topics/api/api-api-call-to-update-lead-utms.md)
- [API - API Call to fetch a Lead's ID](https://docs.sprinthub.com/en/topics/api/api-api-call-to-fetch-a-leads-id.md)
- [API - API Call to fetch Service or Lead Files](https://docs.sprinthub.com/en/topics/api/api-api-call-to-fetch-service-or-lead-files.md)
- [API - API Call to List Lead Services](https://docs.sprinthub.com/en/topics/api/api-api-call-to-list-lead-services.md)
- [API - API Call to list Leads and Lead Fields](https://docs.sprinthub.com/en/topics/api/api-api-call-to-list-leads-and-lead-fields.md)
- [API - Call to list the instance's leads searching for a specific field](https://docs.sprinthub.com/en/topics/api/api-api-call-to-list-leads-and-lead-fields/api-call-to-list-the-instances-leads-searching-for-a-specific-field.md)
- [API - Changing Lead data using any field as reference](https://docs.sprinthub.com/en/topics/api/api-changing-lead-data-using-any-field-as-reference.md)
- [API - Creating Lead and Opportunity at the same time](https://docs.sprinthub.com/en/topics/api/api-creating-lead-and-opportunity-at-the-same-time.md)
- [API - (Advanced) Advanced Tracking via Tracking Script](https://docs.sprinthub.com/en/topics/api/api-advanced-advanced-tracking-via-tracking-script.md)
- [API - HOTMART: Sending abandoned cart event to SprintHub via Make](https://docs.sprinthub.com/en/topics/api/api-hotmart-sending-abandoned-cart-event-to-sprinthub-via-make.md)
- [API - Google Sheets - Sending lead data to Google Sheets](https://docs.sprinthub.com/en/topics/api/api-google-sheets-sending-lead-data-to-google-sheets.md): Step-by-step guide on how to send SprintHub data to a Google Sheets spreadsheet.
- [API - Creating a Lead](https://docs.sprinthub.com/en/topics/api/api-creating-a-lead.md): How to create a Lead with data from a request.
- [API - Updating Lead fields](https://docs.sprinthub.com/en/topics/api/api-updating-lead-fields.md): How to update Lead fields via API.
- [API - How to Recover or Delete Archived Leads](https://docs.sprinthub.com/en/topics/api/api-how-to-recover-or-delete-archived-leads.md)
- [API - Retrieving Custom Objects from the Lead](https://docs.sprinthub.com/en/topics/api/api-retrieving-custom-objects-from-the-lead.md): How to pull the custom objects from a Lead.
- [API - How to Create a Custom Object](https://docs.sprinthub.com/en/topics/api/api-how-to-create-a-custom-object.md): How to create Custom Objects dynamically through the SprintHub API.
- [API - How to Relate a Custom Object to a Contact](https://docs.sprinthub.com/en/topics/api/api-how-to-relate-a-custom-object-to-a-contact.md): How to relate an existing Custom Object to a contact.
- [API - Getting and modifying Lead tags](https://docs.sprinthub.com/en/topics/api/api-getting-and-modifying-lead-tags.md): How to view, remove, and add tags to a Lead.
- [API - GET on Custom Reports](https://docs.sprinthub.com/en/topics/api/api-get-on-custom-reports.md): Using Custom Reports, you can access the data from these reports via API if you want to build these reports in an external system such as Power BI, for example.
- [API - GET on Leads and Opportunities](https://docs.sprinthub.com/en/topics/api/api-get-on-leads-and-opportunities.md)
- [API - Calendars and Meetings](https://docs.sprinthub.com/en/topics/api/api-calendars-and-meetings.md)
- [How to Schedule a Meeting via API](https://docs.sprinthub.com/en/topics/api/how-to-schedule-a-meeting-via-api.md)


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