PayFit MCP Server
for AI Agents
Connect your AI agent to StackOne's PayFit MCP server and give it 23 MCP tools out of the box. Auth, tool execution, and security all managed.
StackOne 
Coverage
23 Agent Actions
Create, read, update, and delete across PayFit — and extend your agent's capabilities with custom actions.
Authentication
Agent Tool Authentication
Per-user OAuth in one call. Your PayFit MCP server gets session-scoped tokens with zero credentials stored on your infra.
Agent Auth →
Security
Agent Protection
Every PayFit tool response scanned for prompt injection in milliseconds — 88.7% accuracy, all running on CPU.
Prompt Injection Defense →
Performance
Max Agent Context. Min Cost.
Free up to 96% of your agent's context window to enhance reasoning and reduce cost, on every PayFit call.
Tools Discovery →What is the PayFit MCP Server?
A PayFit MCP server lets AI agents read and write PayFit data through the Model Context Protocol — Anthropic's open standard for connecting LLMs to external tools. StackOne's PayFit MCP server ships with 23 pre-built actions, fully extensible via the Connector Builder — plus managed authentication, prompt injection defense, observability, and agent execution runtime. Connect it from MCP clients like Claude Desktop, Claude Code, Cursor, Goose, and VS Code, or from agent frameworks like OpenAI Agents SDK, LangChain, and Vercel AI SDK.
All PayFit MCP Tools
Every action from PayFit's API, ready for your agent. Create, read, update, and delete — scoped to exactly what you need.
Collaborators
- Create Collaborator
Create a new collaborator (employee) and return their ID. The collaborator won't have a contract initially and won't appear in the PayFit app until a contract is created.
- List Collaborators
Retrieve all collaborators (employees) for a company including personal info, contracts, and contact details.
- Get Collaborator
Retrieve detailed information for a specific collaborator by ID including personal data, contracts, and contact info.
Collaborator Payslips
- List Collaborator Payslips
Retrieve all payslips for a specific collaborator by their ID.
- Get Collaborator Payslip
Retrieve a specific payslip document for a collaborator by payslip ID.
Contracts
- Create Contract
Create a basic employment contract for a collaborator. The contract won't be finalized until an admin completes the details in PayFit. Only available for French companies.
- List Contracts
Retrieve all employment contracts for a company including job details, status, and working hours.
- Get Contract
Retrieve detailed information for a specific employment contract by ID.
Other (15)
- Get Company
Retrieve company information including legal name, SIREN, country, and onboarding status.
- Get Company (France)
Retrieve French-specific company information including SIREN, SIRET, address, city, postalCode, and healthInsuranceProrationMethod. Only available for French companies.
- List Health Insurance Contracts
Retrieve all health insurance contracts for the company. Only available for French companies.
- List Provident Fund Contracts
Retrieve all provident fund (prévoyance) contracts for the company. Only available for French companies.
- List Worked Time
Retrieve worked time for all contracts for a given pay period. Returns hours worked, overtime, and absence details. Only available for French companies.
- List Collaborators Meal Vouchers
Retrieve meal voucher data for all collaborators for a given month. Only available for French companies.
- Get Payroll Status
Retrieve the payroll processing status for a specific month, indicating if payroll is completed.
- Get Accounting Data V2
Retrieve accounting data for a given month in JSON format. Available for FR and UK companies. Returns detailed entries with analytic codes, employee info, and debit/credit amounts.
- Get Payment File
Retrieve the payment file (SEPA/bank transfer file) for a given month for payroll payment processing.
- List Income Taxes Documents
Retrieve all income taxes documents (P45, P60, P11D) for UK companies. Returns document metadata with download URLs.
- List Auto Enrolment Documents
Retrieve all auto enrolment (pension) documents for UK companies. Returns pension-related document metadata.
- Get Company Document
Download a specific company document by its ID. Use document IDs from income taxes or auto enrolment document lists.
- List Absences
Retrieve a paginated list of absences for the company. By default, only approved absences are returned.
- Update Health Insurance Affiliation
Update health insurance affiliation for an employee contract. Allows assigning health insurance contracts or marking employee as exempted. Only available for French companies.
- Update Provident Fund Affiliation
Update provident fund affiliation for an employee contract. Allows assigning provident fund contracts to employees. Only available for French companies.
PayFit AI Agent Use Cases
Connect your AI agent to PayFit and help your team scale the HR operations they run by hand today.
Use StackOne to connect your AI agent to your HRIS, identity management, and LMS to automate employee onboarding.
ViewUse StackOne to connect your AI agent to your HRIS, knowledge base, and messaging tools to automate HR policy Q&A.
ViewUse StackOne to connect your AI agent to your HRIS, identity management, and ITSM to automate employee offboarding and deprovisioning.
ViewSet Up Your PayFit MCP Server in Minutes
One endpoint. Any framework. Your agent is talking to PayFit in under 10 lines of code.
Agent Frameworks
JSON{
"mcpServers": {
"stackone": {
"command": "npx",
"args": [
"-y",
"mcp-remote@latest",
"https://api.stackone.com/mcp?x-account-id=<account_id>",
"--header",
"Authorization: Basic <YOUR_BASE64_TOKEN>"
]
}
}
}Check More HRIS / HCM MCP Servers
139+ actions
128+ actions
127+ actions
123+ actions
120+ actions
117+ actions
111+ actions
Platform Resources
MCP Code Mode: Keeping Tool Responses Out of Agent Context
Anthropic's code_execution processes data already in context. Custom MCP code mode keeps raw tool responses in a sandbox. 14K tokens vs 500.
11 min
Comparing BM25, TF-IDF, and Hybrid Search for MCP Tool Discovery
Benchmarking BM25, TF-IDF, and hybrid search for MCP tool discovery across 916 tools. The 80/20 TF-IDF/BM25 hybrid hits 21% Top-1 accuracy in under 1ms.
10 min
Indirect Prompt Injection Defense for MCP Tools: A Technical Guide
MCP tools that read emails, CRM records, and tickets are indirect prompt injection vectors. Here's how we built a two-tier defense that scans tool results in ~11ms.
12 min
MCP vs A2A: Architecture, Security, and When to Use Each
MCP vs A2A: what each protocol standardizes, how they differ, their shared security risks including indirect prompt injection, and when to use one, both, or a hybrid architecture.
12 min
MCP vs API: What 200+ Connector Builds Taught Us
MCP wraps APIs, it doesn't replace them. After building 200+ connectors that serve both, here's when each approach wins.
14 min read
PayFit MCP Server FAQ
Does StackOne have a PayFit MCP server?
PayFit MCP server vs direct API integration — what's the difference?
How does PayFit authentication work for AI agents?
origin_owner_id.Are PayFit MCP tools vulnerable to prompt injection?
What is the context bloat of a PayFit agent and how do I avoid it?
Can I limit which actions my PayFit agent can access?
Can I create custom agent actions for my PayFit MCP server?
When should I NOT use a PayFit MCP server?
What AI frameworks and AI clients does the StackOne PayFit MCP server support?
Put your AI agents to work
All the tools you need to build and scale AI agent integrations, with best-in-class connectivity, execution, and security.