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What is a Unified API?

A unified API provides a single, standardized interface to interact with multiple third-party providers. Instead of learning each provider’s unique API format, authentication scheme, and data model, you write code once, and StackOne handles the differences. What StackOne normalizes:
  • Data models – Consistent field names and structures across providers (e.g., files in Google Drive, SharePoint, and Dropbox all return the same schema; users in Google Workspace, Okta, and 1Password all return the same schema)
  • Authentication – OAuth, API keys, and tokens are managed per-provider; you just pass an x-account-id header
  • Pagination – Cursor-based pagination works the same regardless of whether the provider uses offsets, pages, or cursors
  • Error formats – Standardized error responses with provider-specific details when available
Building AI agents? Use the MCP Server, an AI Toolset SDK, or the Actions API (RPC) instead — same data, optimized for LLM tool calling.

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Benefits of the CRM API

Manage customer contacts and accounts through a single standardized API, regardless of the underlying CRM platforms, ensuring a consistent view of customer data.
StackOne’s APIs support real-time data polling, allowing for immediate updates and synchronization across platforms.
With a focus on security, StackOne’s architecture avoids unnecessary data storage, maintaining compliance with data protection regulations.
The platform provides both synthetic and native webhooks, enabling real-time notifications for customer and opportunity changes.

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Key Features

The table below shows key features of the CRM API that make customer relationship management easier, from real-time contact tracking to opportunity management:

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StackOne SDKs & OpenAPI Specification

Use our official SDKs for faster integration. Build with language-native libraries. Full list here.

OpenAPI Specification

Popular SDKs

Node.js Java (JVM) PHP Ruby

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Entity Model and Relationships

The following diagram illustrates the key entities within the CRM API: The following table outlines key entities within the CRM system and provides a brief description of each.