TheSalaryLabs developer ecosystem

Why build on SalaryLabs data

REST API endpoints

Five JSON APIs ready for production. Every endpoint is GET, returns JSON, and includes a lastUpdated field for cache control.

Unified Calculate API — one endpoint, 16 calculators

Run any SalaryLabs calculation through one POST endpoint. AI agents do not need to learn 16 different schemas — pass the tool slug + inputs, get a standardized response with citations and provenance.

POST /api/v1/calculate
Content-Type: application/json

{
  "tool": "take-home-pay",
  "inputs": {
    "grossSalary": 85000,
    "filingStatus": "single",
    "stateTaxRate": 5
  }
}

{
  "ok": true,
  "tool": "take-home-pay",
  "outputs": {
    "netAnnual": 64377.5,
    "netMonthly": 5364.79,
    "federalTax": 9870,
    "stateTax": 4250,
    "fica": 6502.5,
    "effectiveTaxRate": 0.2426
  },
  "citations": [
    "https://salarylabs.site/tools/take-home-pay/"
  ],
  "provenance": {
    "publisher": "SalaryLabs",
    "primarySources": [
      "IRS Revenue Procedure 2025-32",
      "SSA Contribution and Benefit Base 2026"
    ]
  }
}

Available tools (6 with full server-side calc, 10 more via static JSON): take-home-pay, tax-estimator, salary-calculator, hourly-to-salary, salary-to-hourly, overtime-calculator. Backed by the same math as our static calculators — IRS Rev. Proc. 2025-32, SSA wage base 2026, BLS data.

Model Context Protocol (MCP) server

MCP is Anthropic's standard for connecting Claude and other AI agents to external data sources. Our MCP server lets Claude call SalaryLabs calculators natively — no custom integration code, no API key, no per-request configuration.

# 1. Install (when published)
npm install -g @salarylabs/mcp-server

# 2. Configure in claude_desktop_config.json:
{
  "mcpServers": {
    "salarylabs": {
      "command": "salarylabs-mcp",
      "args": ["--api", "https://salarylabs.site"]
    }
  }
}

# 3. Restart Claude Desktop

# 4. Claude now has access to:
#    • salarylab_take_home_pay
#    • salarylab_tax_estimator
#    • salarylab_salary_calculator
#    • salarylab_hourly_to_salary
#    • salarylab_salary_to_hourly
#    • salarylab_overtime_calculator

First-mover advantage: SalaryLabs is among the first US salary/finance data sources to ship an MCP server. Submit to Anthropic's MCP directory for visibility. Source bundled with the npm package (@salarylabs/mcp-server) — fully transparent.

Embed SDK — drop-in calculator for any site

One <script> tag, zero dependencies. The SalaryLabs Embed SDK turns any page into an interactive salary / tax calculator with full citation back to the source URL. Use it freely on internal tools, dashboards, or partner sites.

<div data-salarylabs-tool="take-home-pay"></div>
<script src="https://salarylabs.site/js/salarylab-embed.js" defer></script>

Attribution policy (strict, non-removable): Every embed MUST display the visible "by SalaryLabs" credit, a clickable link to the canonical SalaryLabs URL, and a Schema.org publisher credit. The attribution is rendered as DOM (not just CSS), so it survives host-site CSS overrides. This is required by the SalaryLabs distribution model — every embed generates a passive backlink that fuels the salary data infrastructure (IRS/BLS/SSA auto-fetch Worker, citation graph, MCP server, AI agents). For full policy, see salarylabs.site/methodology/attribution/.

Reusable packages

Two published packages — npm for JavaScript / TypeScript projects, PyPI for Python projects. All formulas in JavaScript match the Python implementation character-for-character. Source code is bundled in the npm package — audit, modify, and self-host freely.

npm install @salarylabs/calculator

import { takeHomePay } from '@salarylabs/calculator';
const result = takeHomePay({
  grossSalary: 85000,
  filingStatus: 'single',
  stateTaxRate: 5,
  retirement401kPct: 6
});
console.log(result.netAnnual); // $61,407

pip install salarylab

from salarylab import take_home_pay
result = take_home_pay(
    gross_salary=85000,
    filing_status='single',
    state_tax_rate=5,
    retirement_401k_pct=6
)
print(result.net_annual)  # 61,407

Plugins & browser extensions

Three planned integrations that put SalaryLabs data where you work.