Keyless Costa Rica Hacienda v4.4 comprobante validator: official XSD for 8 document types, the 50-digit clave numerica, CABYS code lists, totals/IVA math, XAdES-EPES signature check. Rule-coded JSON r

Accepts a structured description of a working relationship and returns a jurisdiction-specific misclassification risk score (0-100), risk level, factor-by-factor analysis, and plain-English reasoning across 20 jurisdictions. Also includes remediation guidance, safe-harbor checklists, financial exposure estimation, cross-jurisdiction comparison, and portfolio-level bulk scoring. No database, no runtime scraping — fast and deterministic responses.

Investment Calculations API is a cutting-edge financial software solution that offers a wide range of calculations related to investment performance, and portfolio optimization.

Turn any activity, spend, freight, or flight into kg CO₂e from open, sourced data (UK DEFRA, US EPA, Ember, IPCC) plus live grid carbon intensity for GB, US & EU and 213 countries.

A globally usable mortgage and loan calculator supporting multiple currencies. Covers monthly repayments, full amortisation schedules, affordability reverse-calculation, early repayment savings, side-by-side comparison, total cost of ownership, APR, debt-to-income ratio, stamp duty estimates, refinance break-even, balloon payments, interest-only periods, loan consolidation, and biweekly payment options. Pure maths — no external data sources. Pass any currency code (USD, GBP, EUR, ZAR, AUD, etc.) for localised display.

Optimize your SEO strategy by improving readability with the SEO Optimization SEO Optimization Readability API.

Streamline complex information using the Technical Writing Technical Writing Readability API for clear communication.

Make your content accessible to all users with the Accessibility Compliance Accessibility Compliance Readability API.

Analyze and improve academic texts with the Academic Readability Analysis API for robust insights.

Increase user engagement by enhancing readability with the User Engagement User Engagement Readability API.

Score IR35 and off-payroll working risk for UK engagements, alongside 19 other jurisdictions' classification tests, with factor-by-factor reasoning.

Bulk-score up to 100 existing contractor relationships in one call, with per-worker risk levels and aggregate statistics to flag your highest-risk workers first.

Score misclassification risk (0–100) across 20 jurisdictions from a structured description of a working relationship, with the legal test applied and factor-by-factor reasoning.

Score one working relationship across up to 5 jurisdictions at once, or compare jurisdictions' legal tests and penalty exposure side by side, to find the safest place to engage a role.

Score misclassification risk before placing a worker in any of 20 jurisdictions, with financial exposure estimates and remediation guidance for EOR and payroll teams.

Quickly assess your debt-to-income ratio with our accurate tool, ensuring your mortgage approval success.

Determine your refinancing break-even point accurately, ensuring you make informed decisions with our intuitive tool.

Simplify interest calculations with the APR Calculator, helping you choose the best loan options available.

Explore options to combine multiple loans effortlessly with our Loan Consolidation API for better financial management.

Discover the benefits of biweekly payments to accelerate your loan repayment with our practical calculation API.

Evaluate your home buying possibilities with our Affordability Calculator, making budgeting simpler and smarter.

Calculate your balloon payments easily, helping you manage large final payments effectively with our API.

Generate clear amortization schedules for your mortgages, allowing for better planning of your repayment strategy.

Understand interest-only mortgage structures with our tool, offering clarity on potential costs and benefits.

Calculate global stamp duties with ease using our comprehensive Stamp Duty Calculator for any mortgage or loan.