StackOne
- Company typePrivate
- Founded2023
- HeadquartersLondon, United Kingdom
- Headcount1–10
- GTM typeB2B
- OfferingSoftware
StackOne firmographics
Firmographics- Name
- StackOne
- Legal name
- StackOne Technologies Limited
- Website
- https://stackone.com
- Company type
- Private
- Founded year
- 2023
- Operating status
- Operating
- Headcount range
- 1–10 employees
- Ownership category
- akta.pro rank
StackOne industry classification
Industry- Product category
- AI Agent Integration Platform
- NAICS
- Computer Systems Design and Related Services (5415), Computing Infrastructure Providers, Data Processing, Web Hosting, and Related Services (5182)
- SIC
- Services-Prepackaged Software (7372)
- akta.pro primary industry
- AI Application Enablement Platforms (Copilot/Agent Frameworks, SDKs) (HDAEANAJ)
- akta.pro secondary industry
- Secure Model Deployment & Runtime Protection (sandboxing, isolation) (HDAAAKAH)
Keywords
Where StackOne is headquartered
LocationHeadquarters
- HQ city
- London
- HQ country
- United Kingdom
- HQ region
- Europe
Offices2 records
Markets served
StackOne business model
Business model- GTM type
- B2B
- Offering type
- Software
- Cost components
- Technology or R&D, Personnel, Marketing or Sales, Infrastructure, Operations
Revenue model
- Usage-based API calls: StackOne charges per action call beyond the free tier allocation. Additional calls are priced at $0.003 each. This creates a usage-based revenue stream where customers scale costs with their AI agent usage.
- Subscription tiers: Tiered subscription model with Starter (free), Core, and Enterprise plans. Higher tiers add premium connectors, unlimited custom connectors via connector builder, A2A protocol access, SOC2 certification, SLAs, and volume discounts for enterprise customers.
Pricing tiers
| Model | Billing | Price |
|---|---|---|
| Freemium | Monthly | Free Starter tier with 1,000 action calls per month |
| Subscription | Monthly | Core plan for growing teams with premium features |
| Subscription | Annual | Enterprise plan with custom SLAs and volume discounts |
Go-to-market motion2 records
Distribution channels3 records
Marketing channels6 records
StackOne product offering
Product offeringCore offering
StackOne provides integration infrastructure for AI agents, offering 330+ pre-built connectors and 21,000+ actions that link AI agents built with frameworks such as LangChain, CrewAI, OpenAI, Vercel AI, and custom stacks to enterprise SaaS systems (HRIS, ATS, LMS, CRM, IAM, documents, and more). The platform supports multiple access protocols — MCP servers, A2A, REST API, and Python/TypeScript SDKs — and is backed by the proprietary Falcon execution engine that manages authentication, retries, rate limits, and data transformation. Security and governance are addressed through Agent Auth, the Permissions API, and the open-source Defender prompt-injection guard.
Product overview
StackOne is an AI-powered integration infrastructure platform for AI agents, consisting of a core platform with 330+ pre-built agent connectors supporting 21,000+ actions across HRIS, ATS, LMS, CRM, IAM, messaging, documents, and more. The platform operates through multiple access methods: MCP Servers for MCP-compatible agents, REST API for direct integration, and AI SDKs in Python and TypeScript. Supporting products include Agent Auth (managed authentication), Connector Builder (AI-powered custom connector creation), Tool Discovery (semantic search), Falcon Engine (high-performance execution), and Defender (prompt injection protection). The architecture uses integrations-as-code with declarative YAML files, multi-tenant isolation, automatic rate limiting and retries, and real-time data transformation.
Differentiator
Problem solved
Functional benefit
Products and services
- StackOne Platform Integration infrastructure for AI agents that connects AI agents to any SaaS system through a single interface, providing 330+ pre-built connectors and 21,000+ actions across HRIS, ATS, LMS, CRM, IAM, messaging, documents, and more. Includes multi-protocol support (MCP, A2A, REST API), the Falcon execution engine, Defender prompt-injection protection, Agent Auth, and Tool Discovery semantic search. Offered under Starter (free), Core, and Enterprise subscription tiers.
Quantifiable outcome
- 91.6% first-try accuracy on S1 Search Bench for semantic tool discovery
- +3 more outcomes
Companies that use StackOne
Customer profileSegments2 records
Ideal customer profiles2 records
StackOne technology and API
TechnologyTechnology focussed Yes
API detail
- Has API
- Yes
- API docs
- API detail
Core technology
AI maturity
App detail
Integration64 records
AI capability5 records
Feature10 records
StackOne partnerships and signals
Strategic signalPartnerships
Six partnerships are on record, tiered core integration and integration partner.
- LangChaincore integrationStackOne's Python and TypeScript SDKs integrate natively with LangChain and LangGraph. The platform supports LangChain's agent frameworks with pre-built connectors and tool discovery capabilities.
- OpenAIcore integrationStackOne supports OpenAI Agents SDK with native MCP integration for function calling. Integrates with OpenAI's agent frameworks and provides connectors accessible via OpenAI's ecosystem.
- Anthropiccore integrationStackOne supports Anthropic's Claude SDK and Claude Desktop with MCP integration. Platform is optimized for Claude Code with 91.6% first-try tool search accuracy.
- CrewAIcore integrationStackOne's Python SDK integrates natively with CrewAI for multi-agent workflows and collaboration. Pre-built examples and connectors available.
- Vercelintegration partnerStackOne supports Vercel AI SDK for AI agent development, providing integration capabilities for Vercel's deployment platform.
- Pydantic AIintegration partnerStackOne's Python SDK integrates with Pydantic AI framework, providing type-safe AI agent development with StackOne's connector ecosystem.
Scale indicators9 records
Recent moves6 records
Expansion highlights6 records
StackOne competitors and assessment
Company assessmentDirect peers
- Composio: Composio is a developer-focused integration platform purpose-built for AI agents and LLMs, offering a large catalog of pre-built tool integrations. It is the closest direct competitor to StackOne in the AI agent integration infrastructure category.
- Merge.dev: Merge provides a unified API for HR, payroll, ATS, CRM, and accounting integrations, targeting B2B SaaS companies. It is a direct competitor to StackOne in the SaaS-to-SaaS integration layer, though it uses a unified-schema approach rather than StackOne's native-model preservation.
- Apideck: Apideck offers a unified API for SaaS integrations with an ecosystem of vertical-specific connectors (HRIS, accounting, CRM). It competes directly with StackOne for the same customer profile of product teams building integrations into their applications.
- Paragon: Paragon is an embedded integration platform-as-a-service that lets SaaS companies ship customer-facing integrations quickly. It targets the same product-team buyer as StackOne with similar pre-built connectors and managed authentication.
Broad incumbents
- Workato: Workato is an enterprise iPaaS platform offering workflow automation and app integrations across thousands of SaaS systems. It is a broader incumbent competing for enterprise integration spend, with overlap in HRIS/ATS use cases where StackOne focuses.
- Tray.io: Tray.io is a general-purpose integration and workflow automation platform serving enterprise and mid-market customers. It overlaps with StackOne in API connectivity and SaaS integrations but addresses a broader automation use case beyond AI agents.
- Zapier: Zapier is the largest consumer/SMB-focused integration platform with thousands of app connectors and a no-code workflow builder. It is a broad incumbent with significant brand reach that competes for the same developer and product-team mindshare as StackOne, particularly at the low end.
- MuleSoft: MuleSoft (Salesforce) is the enterprise iPaaS incumbent with deep on-prem and cloud integration capabilities. MuleSoft is also a StackOne investor, reflecting both strategic alignment and competitive overlap at the enterprise integration layer.
Emerging players
- Pipedream: Pipedream is a developer-focused integration platform combining low-code workflows with code-level extensibility across 1,000+ APIs. It overlaps with StackOne's developer audience and emerging AI agent use cases but is less purpose-built for agent tool execution.
- n8n: n8n is a source-available workflow automation platform with native AI agent capabilities and a large connector catalog. It overlaps with StackOne in the AI agent infrastructure category but is positioned more as a workflow tool than an agent execution engine.
Market position
Strengths5 records
Weaknesses5 records
Competitive moat6 records
Key risks6 records
Key highlights7 records
Customer concentration
StackOne social profiles
Digital presenceStackOne compliance and trust
Trust signalCompliance4 records
StackOne financial estimates
Financial estimateRevenue estimate
Valuation estimate
StackOne leadership team
Management profileNumber of profiles
Profiles2 records
StackOne funding detail
Funding detailFunding overview
Funding rounds2 records
Investors10 records
Funding detail is available on the Subscription and Enterprise plan.Contact sales →
StackOne M&A and investment
M&A and investmentM&A
Investments
M&A and investment is available on the Subscription and Enterprise plan.Contact sales →
Frequently asked questions about StackOne
What does StackOne do?
StackOne provides integration infrastructure for AI agents, offering 330+ pre-built connectors and 21,000+ actions that link AI agents built with frameworks such as LangChain, CrewAI, OpenAI, Vercel AI, and custom stacks to enterprise SaaS systems (HRIS, ATS, LMS, CRM, IAM, documents, and more). The platform supports multiple access protocols — MCP servers, A2A, REST API, and Python/TypeScript SDKs — and is backed by the proprietary Falcon execution engine that manages authentication, retries, rate limits, and data transformation. Security and governance are addressed through Agent Auth, the Permissions API, and the open-source Defender prompt-injection guard.
Is StackOne a public or private company?
StackOne is a private company. It is classified as venture growth investor backed and is currently operating.
When was StackOne founded?
StackOne was founded in 2023. It employs 1 to 10 people.
Where is StackOne based?
StackOne is headquartered in London, United Kingdom, in the Europe region.
How does StackOne make money?
Two revenue lines are on record. Usage-based API calls are the primary driver. The others are subscription tiers.
Who are StackOne's main competitors?
Direct peers on record are Composio, Merge.dev, Apideck and Paragon. Broad incumbents are Workato, Tray.io, Zapier and MuleSoft. Emerging players are Pipedream and n8n.
Does StackOne have an API?
Yes. StackOne offers a REST API and Actions RPC for connecting AI agents to 330+ SaaS integrations. The API supports multiple protocols including MCP (Model Context Protocol), A2A (Agent-to-Agent), and AI Action SDK. Authentication methods include OAuth, API keys, and token refresh handled automatically. Available via REST API, MCP servers, A2A protocol, or SDK (Python, TypeScript). Documentation available at docs.stackone.com with API reference, SDK guides, and connector references. Developer documentation is at docs.stackone.com/api/platform-overview.
What industry is StackOne in?
StackOne's product category is AI Agent Integration Platform. Its primary akta.pro industry code is HDAEANAJ, AI Application Enablement Platforms (Copilot/Agent Frameworks, SDKs), with a secondary code of HDAAAKAH, Secure Model Deployment & Runtime Protection (sandboxing, isolation). Its NAICS code is 5415 and its SIC code is 7372.