Outreach API
Provides a JSON:API-compliant REST interface for managing Outreach sequences, prospects, accounts, tasks, and call/email activities in a sales engagement workflow.
Score Breakdown
⚙ Agent Friendliness
🔒 Security
Fine-grained OAuth2 scopes per resource type give strong access control. Webhook HMAC validation documented. SOC2 Type II certified. Prospect and email content data is sensitive.
⚡ Reliability
Best When
An agent needs to orchestrate multi-step outreach sequences, manage prospect lifecycle, and sync activity data within the Outreach platform as part of a revenue automation stack.
Avoid When
You need a lightweight or low-cost outreach solution; Outreach is an enterprise platform with pricing and complexity to match.
Use Cases
- • Automatically add prospects to sequences when new leads are qualified in a CRM or enrichment pipeline
- • Create and update account and prospect records with data from external enrichment sources before outreach
- • Retrieve sequence step performance metrics to identify and replace underperforming email templates
- • Log inbound call and email activities programmatically to keep Outreach activity timelines in sync
- • Mark tasks complete and advance prospects through sequence steps based on external event triggers
Not For
- • Sending email directly through the API without sequence enrollment — Outreach routes all sends through its deliverability infrastructure
- • Organizations not already licensed for Outreach's sales engagement platform
- • Simple contact list management without sequence or task automation needs
Interface
Authentication
OAuth2 authorization code and client credentials flows supported. Scopes are fine-grained per resource type (prospects.read, sequences.write, etc.). Access tokens expire in 2 hours; refresh tokens are long-lived.
Pricing
No public free tier. Developer sandbox requires applying through Outreach's partner program.
Agent Metadata
Known Gotchas
- ⚠ The JSON:API response envelope adds nesting complexity — relationships are returned as links, not embedded objects, requiring additional GET calls to resolve associated records
- ⚠ Sequence enrollment requires the prospect to not be in a finished or bounced state; agents must check state before enrolling or handle the resulting 422 error
- ⚠ Webhook signatures must be validated using HMAC-SHA256; agents that skip validation open themselves to spoofed payloads
- ⚠ Filter syntax uses JSON:API sparse fieldsets and filter query params that differ from standard REST conventions and require careful URL encoding
- ⚠ Creating a task without a dueAt timestamp causes it to appear with no due date, which is valid but often not the desired agent behavior
Alternatives
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Scores are editorial opinions as of 2026-03-06.