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Upsert contacts by email or unique value

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Upsert contacts by email or unique value

with HubSpot
Works with AI assistants

Use HubSpot: its Hubspot Batch API lets you upsert contacts by email or unique value in a single step (POST /crm/objects/2026-03/contacts/batch/upsert). HubSpot also has an MCP server, so an AI assistant like Claude or ChatGPT can do it for you. capabilities.work can help you get signed up and connected.

  • Can I sync a contact list so existing people update and new ones get added?
  • What's the way to avoid duplicate contacts when importing by email?
Say it to your AI assistant
  • Upsert contacts {contacts} by their unique property.
  • Sync people {contacts} into contacts, updating matches by email.
For your developer

POST /crm/objects/2026-03/contacts/batch/upsert in Hubspot Batch API. Full spec on APIs.io.

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