Connect
Optimize
Secure
Integration Infrastructure
for AI Agents
Your agent thinks, StackOne takes action. Connect, optimize, and secure your AI agents' external interactions to fully automate workflows.
Backed by 
Angel investors from 
AI Agents
Connect
MCP and A2A to REST, SOAP, and proprietary APIs.
Optimize
Tool discovery, data shaping, and reliable execution.
Secure
Scoped permissions, audit trails, and observability.
StackOne Integration Layer
get_employee
workday 
create_user
onelogin 
create_course
docebo 
update_employee
bamboohr 
send_message
slack 
StackOne Integration LayerConnect
200+ connectors, build your own, and multi-protocol support.
Optimize
Context, token, and speed optimization infrastructure.
Secure
Permissions API and prompt injection protection.
200+ AI Agent Connectors.
10,000+ Actions.
Extend Any AI Connector.
Build Your Own.
SOAP, OData, XML-RPC, proprietary APIs—doesn't matter. AI Builder creates production-ready connectors from any enterprise system in minutes, not months.
ai-connector-builder — stackone/connectors
Connecting AI Agents Using
Any Protocol.
Your frameworks. Your agents. Your systems. Four ways to connect them all to StackOne.
Native tool calling for any MCP-compatible agent.
✓Works with any MCP-compatible client, regardless of language or framework. Explore MCP servers
OpenAI Agents SDK·
TypeScriptimport { Agent, MCPServerStreamableHttp, run } from "@openai/agents";
const authToken = Buffer.from(
`${process.env.STACKONE_API_KEY}:`
).toString("base64");
const stackoneMcp = new MCPServerStreamableHttp({
url: "https://api.stackone.com/mcp?x-account-id=<account_id>",
requestInit: {
headers: {
Authorization: `Basic ${authToken}`,
},
},
});
await stackoneMcp.connect();
const agent = new Agent({
name: "stackone-assistant",
model: "gpt-5.2",
mcpServers: [stackoneMcp],
});
const result = await run(agent, "List Salesforce accounts");
console.log(result.finalOutput);Powered by StackOne's
AI Tools Execution Engine
StackOne connectors are built on our next-generation execution engine, aka Falcon. It's full of features designed to optimize your agent's context, token usage, and reliability.
Integrations-As-Code
Every connector is a declarative YAML file in Git — reviewable in PRs, testable locally, reproducible across environments.
Multi-Tenancy
Isolated execution contexts per customer with scoped credentials, permissions, and full audit logs.
Rate Limit Handling
Automatic per-provider throttling, queuing, and retries so your agents never hit a limit.
Managed Authentication
OAuth, API keys, and token refresh handled automatically for every connector. Your agent never touches a secret.
Low-Latency Transformations
Real-time data shaping and caching that delivers full payloads to your app and lean summaries to your agent.
Multi-Protocol
One connector definition, automatically exposed via REST API, MCP, A2A, and AI SDKs with zero extra config.
Integrations-As-Code
Every connector is a declarative YAML file in Git — reviewable, testable, reproducible.
Managed Authentication
OAuth, API keys, and token refresh handled automatically. Your agent never touches a secret.
Multi-Tenancy
Isolated execution contexts per customer with scoped credentials and audit logs.
Low-Latency Transformations
Real-time data shaping and caching for lean context windows and full app payloads.
Rate Limit Handling
Automatic per-provider throttling, queuing, and retries so agents never hit a limit.
Multi-Protocol
One connector definition, exposed via REST API, MCP, A2A, and AI SDKs.
Enforce Agent Permissions
& Governance.
Control exactly what each agent can access across every integration. StackOne's Unified Permissions API normalizes RBAC, scopes, and ACLs into a single model — so one set of rules works everywhere.
1 Tool Request
Agent calls get_document() via StackOne
user:alice tenant:acme 2 Permission Check
Checks which docs were shared with alice by admin
report_Q4.pdf roadmap.docx
3 Scoped Response
3 docs found, filtered to 1 doc shared with alice
audit logged < 1ms Unified Permission Model
Every provider models permissions differently. StackOne maps roles, scopes, and access levels to a single schema so your application logic stays clean and portable.
Per-Tenant Scoping
Each customer gets isolated credentials and connections. Define access rules once and enforce them across every connected provider — per user, per agent, per tenant.
Real-Time Checks
Verify access before every operation. Sub-millisecond permission checks with local caching ensure governance is enforced without adding latency.
Defend Agents
Against Prompt Injection.
AI agents that call tools are exposed to indirect prompt injection — the #1 OWASP LLM risk. StackOne Defender detects and neutralizes malicious content hidden in tool responses before it reaches the LLM.
Defender
0.88
F1 Score
22 MB ~10ms
LLM Moderation
0.82
F1 Score
>2 GB 500ms+
Gateway Proxy
0.65
F1 Score
Infra required
Regex Patterns
0.40
F1 Score
<1 MB
Two-Tier Defense Pipeline
Tier 1 catches known attack patterns in ~1ms. Tier 2 runs a fine-tuned ML classifier in ~10ms for adversarial attacks that evade pattern matching. F1 score: 0.87-0.88.
Scans Every Tool Response
Emails, documents, PRs, CRM records — any tool response can contain hidden instructions. Defender scans and sanitizes content before your agent processes it.
Open Source, Zero Latency
Runs in-process with a bundled ONNX model — no external API calls, no inference costs, no network latency. Three lines of code to integrate.
Your CISO Says Yes.
Real-time by design, StackOne never stores your customers' data by default. SOC 2 Type II certified, GDPR and HIPAA compliant — built for enterprise from day one.
Zero Data Storage
StackOne proxies every request in real-time. No customer data is persisted by default — nothing to breach, nothing to leak.
Full Audit Trail
Every API call, permission check, and credential use is logged. Complete audit trail across all providers from a single endpoint — ready for compliance reviews.
Certified & Compliant
SOC 2 Type II certified infrastructure with encrypted credentials at rest, automatic token refresh, and real-time monitoring across every integration.
SOC2 II Certified 
CCPA Compliant 
GDPR Compliant 
HIPAA Compliant What Will Your Agent Do?
Employee Onboarding
Use StackOne to connect your AI agent to your HRIS, identity management, and LMS to automate employee onboarding.
Learn more → Deal Risk Scoring
Use StackOne to connect your AI agent to your CRM, email, and calendar tools to automate deal risk scoring and pipeline alerts.
Learn more → Voice Call Summarization
Use StackOne to connect your AI agent to your telephony, CRM, and messaging tools to automate voice call summarization and CRM logging.
Learn more → Month-End Accruals
Use StackOne to connect your AI agent to your accounting, payment, and analytics systems to automate month-end accruals and journal entries.
Learn more → Campaign Performance Reports
Use StackOne to connect your AI agent to your marketing automation, email, and analytics platforms to automate campaign performance reporting.
Learn more →Frequently Asked Questions
StackOne is integration infrastructure for AI agents. It connects your AI agents to any SaaS system through a single interface, with 10,000+ pre-built actions across HRIS, ATS, LMS, CRM, IAM, documents, and more—plus the connector builder to create custom actions for any API. Your agent reasons and decides what to do—StackOne executes it.
Pick the protocol that fits your stack: MCP (Model Context Protocol), A2A (Agent-to-Agent), the AI Action SDK for Python and TypeScript, or direct REST APIs. Most integrations take under six lines of code. StackOne handles authentication, retries, rate limiting, file handling, data transformation, and governance across every provider.
StackOne ships with 200+ pre-built connectors spanning HRIS, ATS, LMS, CRM, IAM, messaging, documents, and more. If a connector doesn't exist yet, the connector builder lets you create production-ready connectors for any API—including SOAP, OData, and proprietary systems—in minutes.
Falcon is StackOne's execution engine—the layer that runs every action your agent takes. It handles auth, retries, errors, and data transformation across REST, GraphQL, SOAP, and proprietary APIs. Your agent decides what to do; Falcon makes sure it actually happens, reliably and safely.
Yes. StackOne is SOC 2 Type II certified, GDPR compliant, HIPAA compliant, and CCPA compliant. It uses a privacy-first architecture that never stores your customers' data by default. Multi-region data processing is available for EU and US residency requirements.
StackOne offers a free Starter plan with 1,000 action calls per month, all standard connectors, and MCP access—no credit card required. Additional calls are $0.003 each. Core and Enterprise plans add premium connectors, unlimited custom connectors, A2A protocol, SOC 2 certification, SLAs, and volume discounts.
StackOne's MCP Servers let any MCP-compatible AI agent—Claude, Cursor, Windsurf, custom builds—access StackOne's full catalog of connectors and actions through the Model Context Protocol. One MCP server, 200+ integrations. No SDK needed, no custom code. Your agent discovers available tools, calls them, and gets structured responses back.
Developers building AI agents that need to take action across enterprise SaaS—HR systems, recruiting tools, CRMs, document stores, identity providers. If your agent needs to pull employee data from Workday, create a candidate in Greenhouse, or search files in SharePoint, StackOne is the infrastructure that makes that work in production.
StackOne solves three problems for AI agent teams: integration across enterprise SaaS, accurate and reliable tool calling execution, and secure execution across every app your agent touches. That means authentication across dozens of OAuth and SAML flows, handling rate limits and retries, transforming data between systems, managing permissions so agents don't overstep, and keeping the LLM context window under control so your agent reasons well. Your team can access all of this via REST API, A2A and MCP protocols, or StackOne's SDK. Your agent can act across any system with 200+ pre-built integrations, 10,000+ actions, and the connector builder to build for any API. Execution is code-based so developers keep complete control, while our platform is real-time and bidirectional—we never store any data by default. Compliant and tooled with permission control, you always ensure your AI agent actions are secure.
StackOne is different from a unified API because unified APIs flatten every enterprise SaaS API into one generic schema—good for developers writing deterministic code, bad for agents. StackOne takes an AI agent-first approach preserving each provider's real data model, field names, and capabilities. An agent working with Greenhouse gets Greenhouse concepts, not a lowest-common-denominator abstraction. We standardize behavior (auth, pagination, error handling) without losing the depth agents need to do useful work. Read why unified APIs break for AI agents.
Put Your Agents to Work
All the tools you need to build and scale AI agent integrations, with best-in-class connectivity, execution, and security.