"Free APIs and services without commercial fees" matching MCP servers:

Enables searching and retrieving Korean commercial registration precedents (617 cases) from the Supreme Court's portal for legal practice.

Enables trademark clearance and research across EU and Benelux registers, plus company, group-structure, and EU VAT lookups, all through free public sources without API keys.

Enables AI models to access IBM FileNet Content Manager capabilities including document management, property extraction, legal holds, and AI-powered document insight through standardized MCP interfaces.

Read-only MCP server that performs deterministic local preflights of agent-payment boundary documents and x402 v2 PaymentRequired JSON, and prepares unsubmitted public quote-request drafts without network calls or fund movement.

Deterministic US equity-compensation tax optimizer. Six tools cover ISO/AMT exercise scheduling, NSO sell-vs-hold, RSU vest-and-sell, single-stock concentration, protective put / zero-cost collar pricing, and Section 1202 QSBS qualification. Federal plus 50-state plus DC tax math.

Torify gives AI agents the Japanese locale primitives that standard libraries lack — imperial era date conversion (wareki), qualified invoice number validation with NTA registry lookup, corporate number lookup (法人番号), postal code resolution, name romanization (Hepburn), and kanji-to-kana conversion via Yahoo! JLP. 31 endpoints total. No authentication required for MCP. Pay-per-call $0.02/call via

Cross-checks company/entity records against 23 national commercial registries (GLEIF, SIRENE, VIES, TED, Companies House) to flag missing or inconsistent registrations. Free tier: 100 calls/month via hosted API.

A server for querying, practicing, and analyzing exam questions from Taiwan's national examinations, offering 20 tools including search, statute lookup, weak topic review, and readiness assessment.

MCP server for the RegIntel API — structured regulatory data across 41 jurisdictions and 212 regulations

Integrates the Metis FCA Handbook AI Harness into Claude Desktop to analyze FCA Handbook applicability for financial products, services, or firms, returning structured compliance reasoning with verbatim citations.

Enables high-performance access to USPTO Final Petition Decisions API with intelligent context reduction (80-99%), customizable fields, hybrid document extraction (free PyPDF2 + Mistral OCR fallback), and seamless cross-MCP integration for complete patent lifecycle analysis including prosecution history, PTAB challenges, and citation intelligence.

MCP server for offline verification of signed artifacts — receipts, manifests, and audit bundles. MIT licensed, works without accounts or API calls. Tools: self_test, verify_receipt, verify_bundle, explain_artifact.

Enables searching and retrieving EU legal documents (regulations, directives, court decisions) via the EUR-Lex Cellar API, supporting full-text search, metadata, citations, and consolidated versions without requiring an API key.

IBAN validation across 89 countries, BIC/SWIFT and Swiss clearing lookup, batch validation, payment-reference, postal-address and Swiss QR-bill checks for AI agents. Connect via MCP or the REST API. Includes free quotas, paid credits and a Pro subscription. SEPA and country-risk indicators support payment-data checks; they do not confirm account ownership or replace beneficiary AML/KYC screening.

Automates GSTR-1 filing through Sandbox.co APIs, enabling seamless integration with Claude Desktop or API for GST return submission.

MCP server that allows AI assistants to verify, compare, and explain brand names using live trademark, domain, and cultural data, with a free anonymous tier.

Helps independent inventors calculate USPTO fees, determine entity status, track patent deadlines, and understand procedural rules without needing an attorney.

Monitor taken usernames and get alerted the moment they free up or drop, so you can claim a handle before anyone else. Also checks live username availability across the major social platforms, domain availability across popular TLDs, and screens names for trademark conflicts.

Enables local SOC 2 compliance work by scanning Infrastructure-as-Code, mapping findings to SOC 2 Trust Services Criteria, explaining risks in plain English, and drafting audit-ready documents without uploading files.

Construction trade compliance MCP server. Covers electrical, plumbing, HVAC, welding, roofing, gas fitting, solar and more across Australia, UK, USA, Canada and EU. 8 tools (3 free, 5 pro): compliance checking, cable sizing, RAMS generation, safety checklists, material compliance verification and inspection requirements. Works in Claude Desktop, Cursor, Windsurf and any MCP client.