OpenPhone Business Phone API
OpenPhone API for modern business phone system designed for startups and small teams. Enables programmatic access to calls, SMS/MMS messages, contacts, and voicemails. OpenPhone is popular with startups for its simplicity and integrations with Zapier, Salesforce, and HubSpot.
Score Breakdown
⚙ Agent Friendliness
🔒 Security
Customer call and SMS data. SOC2 certified. US/Canada only. API key security required.
⚡ Reliability
Best When
A startup or small team using OpenPhone wants AI agents to automate SMS follow-ups, log calls to CRM, and transcribe voicemails — without complex enterprise telephony setup.
Avoid When
You need enterprise-grade contact center features. OpenPhone is optimized for small teams. PRIVACY: Call recordings and SMS messages contain customer data.
Use Cases
- • Querying call and SMS history from small business communications agents
- • Sending automated SMS follow-ups from sales workflow automation agents
- • Retrieving voicemail transcriptions from customer service automation agents
- • Syncing OpenPhone contacts with CRM tools from sales pipeline agents
Not For
- • Large enterprise contact center operations (OpenPhone is SMB-focused)
- • High-volume A2P SMS campaigns (OpenPhone is for small team conversations)
- • Complex IVR and call routing requirements
Interface
Authentication
OpenPhone API key authentication. Keys generated in OpenPhone account settings. Webhook verification for incoming events.
Pricing
OpenPhone subscription required. API access included with Business plan and above.
Agent Metadata
Known Gotchas
- ⚠ PRIVACY: Call recordings and SMS messages are customer communication data
- ⚠ No public MCP server — REST API integration required
- ⚠ API only available on Business plan and above
- ⚠ US and Canada phone numbers only
- ⚠ SMS sending rate limits apply — batch messaging requires planning
Alternatives
Full Evaluation Report
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Scores are editorial opinions as of 2026-03-07.