
Leadspace
8.2#2 in b2b contact data providersFrom $49 a monthFree planWebAPIExtension
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| Fact | Leadspace | OpenGTM |
|---|---|---|
| API | The v4 Single Direct API uses HTTPS, JSON, bearer authentication and the apigw.leadspace.com endpoint. | A generated REST reference exposes endpoints for leads, workbooks, audiences, automations, CRM, outreach, signals, governance, and other operations. |
| Integrations | The listed ecosystem includes Salesforce, Marketo, HubSpot, Eloqua, Snowflake, BigQuery, REST API and an MCP Server. | Documented destinations include HubSpot, Salesforce, Slack, Google Sheets, Airtable, Instantly, Smartlead, webhooks, warehouses, and consent-gated ad audiences. |
| Product | Leadspace provides real-time data intelligence to help B2B organizations identify buyers, prioritize opportunities, and execute go-to-market strategies. | OpenGTM is an open-source, self-hosted workspace for GTM teams and their agents. |
You want what its maker publishes above — check its page for the details.
It suits GTM teams that want to manage lead sourcing, enrichment, research and outbound automation on infrastructure they control. Teams should be prepared to set up Docker and manage provider costs and production security requirements.