Use AssistCall with Sierra Interactive

AssistCall answers your business calls 24/7 and can send each call, message and booking to Sierra Interactive through Live API actions, Zapier, n8n.

Sierra Interactive: An IDX website and CRM platform for real estate teams that captures leads on the agent's own domain, routes them and runs automated follow-up.

Connects

Example call

An existing lead calls to ask whether a saved listing is still available. AssistCall finds them in Sierra by phone number, takes the message, and adds a note with the summary to their lead. The assigned agent is notified and sees the note on the lead record.

During a call, find the caller in Sierra by phone number (GET /leads/find?phone=) with your API key, so the receptionist knows if they are an existing lead
After the call, add the summary and recording link to that lead with POST /leads/{id}/note, or with Zapier's Find Lead and Create Note actions
When a caller books a showing, create a task for the assigned agent through Zapier's Create Task action

How it connects

Live API actions: During the call, the receptionist calls the app's API with your key to look up or create records.
Zapier: Send AssistCall events to a Zap (Webhooks by Zapier, Catch Hook), then use the app's Zapier actions. Needs a paid Zapier plan.
n8n: Start an n8n workflow with a webhook node, then call the app with its node or an HTTP request.
Call forwarding: Forward your business line to AssistCall when busy, after hours or always. Works with any carrier.

About Sierra Interactive's API

Self-serve API: you can create a key in your account
Style: REST (JSON)
Authentication: API key in a Sierra-ApiKey request header
On Zapier: yes. On Make: no.

The API key is under Gear icon > Integrations > Sierra Interactive. By default only the Primary Manager can open the Integrations Manager. Regenerating the key (disable and re-enable) breaks every integration that uses the old key. The base URL is https://api.sierrainteractivedev.com. GET /leads/find accepts a phone parameter. POST /leads requires an email (the docs also list a password field as required). POST /leads/{id}/note adds a note. Webhooks include LeadCreated, LeadDetailsChanged and LeadNoteAdded. Rate limits were not found in the docs. Zapier app: 7 triggers and 10 actions, including Create Lead, Find Lead, Create Note and Create Task. No Make app found.

Not included: no one-click Sierra Interactive app, no listing in Sierra Interactive's marketplace, no two-way sync, and no partnership with Sierra Interactive.

Researched by the AssistCall team and checked against Sierra Interactive's public pages on October 24, 2026. Sierra Interactive is a trademark of Sierra Interactive. AssistCall is an independent product of Starling Global LLC and is not affiliated with, endorsed by, sponsored by or approved by Sierra Interactive.

More Real estate CRMs integrations

BoldTrail (formerly kvCORE): An all-in-one platform for agents and brokerages that combines a CRM, IDX websites, lead generation and Smart Campaign automation, and is often provided by the brokerage.
Follow Up Boss: A lead management CRM for real estate agents, teams and brokers that collects leads from many sources and runs follow-up through action plans, texting and calling.
BoomTown: A real estate platform for teams and brokerages that combines lead generation, IDX websites, a CRM and lead concierge services.
CINC: A lead generation and CRM platform for real estate teams and brokers that runs paid ads, IDX sites and lead follow-up in one system.
LionDesk: A low-cost CRM for real estate agents with contact management, drip campaigns, texting and video email.
Lofty: An AI-driven CRM, IDX website and lead generation platform for real estate agents, teams and brokerages, formerly called Chime.

All product and company names in this directory are trademarks or registered trademarks of their respective owners, used only to identify systems AssistCall can send call information to or receive information from. Their use does not imply any affiliation with or endorsement by their owners. AssistCall connects using signed webhooks, the business's own API keys, automation platforms (Zapier, Make, n8n) the business sets up in its own account, and call forwarding. AssistCall does not provide one-click connectors, marketplace apps, certifications or two-way record or calendar sync, and does not sign HIPAA business associate agreements. Vendor features, plans and API access can change; information last checked October 24, 2026.