#validation

DATPAQ exposes 34 production data & utility APIs through one hosted MCP endpoint. Give any MCP client access to IP geolocation & intelligence, DNS / WHOIS / MX / domain lookups, email & phone validation, currency exchange rates, precious metals, aircraft & VIN lookups, web scraping & screenshots, unit/time conversion, dictionary/thesaurus/spell-check, company enrichment, and more — all with a single connection. Authenticate per-request with your Datpaq API key (Authorization: Bearer <key>); the server holds no credentials, so one instance serves many tenants.

Data247's MCP connector offers many different data services including phone carrier lookup, phone append, email append, reverse phone append, reverse email append, CNAM lookup, IP address geolocation, Do-not-call, phone number in-service verificaition, email deliverability verification, fraud detection, and more. Our MCP server makes all of these data services available for consumption by AI clients. We also offer an API, file upload processor, browser extension, and other ways to consume our data. Data247 has been in business over 20 years and is a trusted provider of quality data services

MCP server for IBAN validation, test IBAN generation, batch validation, BIC checks and German bank account validation. Tools are publicly discoverable; execution requires login or an API key. Includes 10 free API requests per 24 hours.

Monitor AI output schemas and API contracts for breaking changes — validate LLM JSON responses against defined schemas on a schedule

Tlaloc's MCP server connects Claude, ChatGPT, and any AI assistant to official Mexican data: validate CURP (RENAPO) and RFC (SAT), look up postal codes (SEPOMEX) and phone carriers (IFT), and download/verify SPEI payment receipts (CEP, Banxico). 7 tools, Streamable HTTP, Bearer auth. Pay-per-call via SPEI — no card, no subscription. Si el campo es corto, usa la versión meta (~160c): Validate CURP, RFC, postal codes, phone numbers, and SPEI receipts (CEP) from official Mexican sources. Pay-per-call via SPEI, plus an MCP server for your AI assistant.

Tamper-proof AI memory for Claude & Cursor. Every memory your AI writes is truth-validated and SHA-512 chain-sealed — so it never silently contradicts itself or forgets. Connect via OAuth in 30 seconds. Free tier, 38 tools, audit-ready.

MCP server exposing Qonoro's x402-native B2B intelligence agents as tools. Pay per call via USDC/x402, no subscription, no API key required. Tools: company enrichment, company research, competitor analysis, sales signals, intent signals, job change detection, person enrichment, revenue lead qualification, domain intelligence, news sentiment, outbound personalization, domain resolver, KYB entity verification, email validation, NAICS classification, phone validation, URL health check, and address normalization.

Anti-hallucination firewall for AI coding agents. Validates commands before execution, imports against your package.json, function calls against your source files. Sub-100ms. $0.0068 AUD per check, 120 free on sign-up.

IBAN validation, extraction, format specs, and BIC/SWIFT lookup tools for AI assistants, backed by ibanchecker.cash. Covers 90 countries; no IBAN data is stored.

Verified locale data for AI agents: dates, phone numbers, currency formatting, VAT/sales-tax by date, public holidays, and addresses (UK & US). Returns checked answers and flags impossible inputs instead of guessing.

Verified IBAN, payment card, ISBN-13 and VIN validation for AI agents — runs the real checksum algorithms (mod-97, Luhn, mod-10, ISO 3779) instead of letting the model guess, and returns structured results with clear errors.

Documentation and assembly review for @nhtio/adk.

Open-source self-hosted technical SEO audit MCP server built on the LibreCrawl engine. Runs full audits inside Claude, Cursor, or Codex — 37 tools, 50+ checks per audit (hreflang, schema.org Rich Results, security headers, image performance, WAF detection on 200-OK pages), chunked-progressive crawler so big sites don't time out, branded PDF + 7 sidecar CSVs. Ephemeral by default — server wipes session, artifacts, and upstream record after every download. MIT.

Validate a business idea against 6 live demand signals: Demand, Pain, Competition, Money, Funding, Urgency. Drawn from a 55k+ idea corpus across 200+ sources (a16z, YC, Product Hunt, Forbes, App Store), hundreds scored each week and refreshed daily, with named competitors, metrics, and real user complaints cited to source URLs. Validate your own idea too. Works in Claude Code, Cursor, and Codex.

MCP server for YAML: validate & lint, convert between 10 formats, visualize as diagrams, and create/edit your saved diagrams — from your AI editor.

Deterministic cross-branch conflict detection for AI coding agents. Scans your git repo for function signature mismatches, HTTP route conflicts, and schema breaks across branches using tree-sitter AST analysis. Catches the merge failures that CI misses because tests only run on one branch at a time.

Validate startup ideas with behavioral evidence — not opinion. Demand Discovery AI™ is a sales-agent MCP that answers founders' questions about the validation framework, the four data-signal categories (Search & attention, Conversation & pain, Adoption & spend, Capital & hiring), the Demand Score™, and the Build/Pivot/Kill verdict™. Includes 7 tools: ask a free-form question, get the validation framework, get product details, explain demand signals, compare validation approaches, get data-source categories, and start a free Market Research report (deep-links the user's idea into demanddiscovery.ai for the kickoff). Stateless. No auth. No API key required.

SchemaCheck Agent validates JSON payloads against JSON Schema Draft 7 and 2020-12 standards. Designed for agent-to-agent workflows, it returns structured validation results instantly — including field-level error paths, human-readable summaries, and optionally a corrected payload when repair mode is enabled. Built on the x402 micropayment protocol, each validation call costs $0.005 USDC on Base mainnet — no subscriptions, no API keys, no accounts. Pay per call, settle on-chain.

Validate startup ideas before your build agent scaffolds code. One MCP tool, validate_idea, returns a 10-dimension Venture Readiness Score (0–100, computed deterministically in code), an evidence brief tagged by source (observed / inferred / missing / AI / user-claim), a kill / pivot / test / build verdict, and live signal from Reddit, GitHub, Hacker News, Stack Overflow, and dev.to. Calibrates to the user's declared founder skill graph and assigns 1–3 archetypes with structural cautions. Designed to sit BEFORE code-scaffolding in a build-agent flow.

stdio MCP server from @archrad/deterministic—same engine as the archrad CLI. Validates architecture IR (structural + IR-LINT), merges local PolicyPack YAML, checks export drift vs generated files on disk, and returns static archrad_suggest_fix guidance per built-in rule code. No cloud account required; runs locally in Cursor, Claude Desktop, and other MCP hosts. Apache-2.0. Docs: docs/MCP.md in the repo.

Official MCP server for IdeaBob.com — AI-powered idea scoring, 9-dimension Opportunity Score, technical moat analysis, pressure testing, and competitor research for AI/LLM/startup ideas. ### Connection Details - **URL**: `https://umxgvoxlxznnpdvkgnaj.supabase.co/functions/v1/mcp` - **Type**: Remote HTTP / Supabase Edge Function - **Auth**: Bearer token (users generate their own token on ideabob.com) ### Features / Tools - `score_idea` - `pressure_test` - `validate_market_fit` - `generate_competitor_analysis` - etc. ### Website https://ideabob.com ### Additional Info Free tier available. Users must sign up at ideabob.com to get their personal token.

MCP server providing European data validation and formatting tools for AI agents. Tools included: - validate_nif: Validates Portuguese NIF (tax identification numbers) using the official algorithm - validate_iban: Validates IBAN numbers for 18 European countries - get_vat_rate: Returns VAT/IVA rates for all EU countries (standard, reduced, super-reduced rates) - get_portugal_holidays: Returns Portuguese public holidays for any given year - format_number_european: Formats numbers according to European locale conventions (PT, ES, FR, DE, and more) Perfect for AI agents handling European invoicing, tax compliance, financial document processing, and business automation. Endpoint: https://mcp-europe-tools-production.up.railway.app/mcp

Access Versium's B2B2C identity graph directly through your AI agent. Generate targeted lead lists, enrich records with contact and firmographic data, validate emails, and size audiences — all through natural language. No manual exports or API coding required. Requires an active Versium REACH subscription with API access.

MailboxValidator MCP server validates email addresses using MailboxValidator API to ensure your mailing list is clean and to reduce email bounces during marketing campaigns. With a free MailboxValidator API key, users can query up to 300 emails per month. If more queries are required, users can opt for a paid API plan instead. https://www.mailboxvalidator.com/plans#api

x402 micropayment API for AI agents. Validates SMS-capable phone numbers. Pay per call with USDC on Base.

x402 micropayment API for AI agents. Validates and formats phone numbers. Pay per call with USDC on Base.

x402 micropayment API for AI agents. Validates postal addresses worldwide. Pay per call with USDC on Base.

MCP server for email address validation — syntax check, MX record verification, disposable email detection, role-based detection. Pay-per-use via x402 protocol (USDC on Base). Use this when you need to validate email addresses before sending.

Make your AI agents cheaper, faster, and more reliable. 5 products, 14 MCP tools, 1 API key. Task deduplication, cost prediction, output validation, behavioral governance, and shared failure intelligence. Anonymous demo mode — try all tools without a key. 1,000 free credits/month, no card required. https://plith.ai/.well-known/mcp/server-card.json

5 APIs behind one MCP server: task deduplication (DedupQ), cost prediction (BurnRate), output validation (QualityGate), behavioral governance (GuardRail), shared failure intelligence (PitfallDB). No signup needed. 1,000 free credits/month.

Superhuman exploratory data analysis. Finds novel, statistically validated patterns in any tabular dataset — the feature interactions, subgroup effects, and conditional relationships that LLMs and manual exploration miss. Every finding comes with p-values, effect sizes, and academic literature citations. Multiple novel scientific discoveries made. Free for public data.

Validate German and European e-invoices (ZUGFeRD, Factur-X, XRechnung) against EN 16931. Returns structured JSON with errors, warnings and concrete fix suggestions. Free API key available at zugferd-validator.de.

IBAN validation & BIC/SWIFT lookup API for AI agents. 75+ countries, 39K+ GLEIF entries, SEPA compliance data, issuer classification (vIBAN detection), risk indicators. 3 MCP tools: validate_iban, batch_validate_iban, lookup_bic. Free during beta.

Hosted MCP email validation utility for checking email format and validation workflows through a remote MCP server.

Campaign link infrastructure for AI agents and developers. Validate destinations, build UTM-tracked links, and inspect landing pages for social-sharing readiness (OG tags, Twitter Cards, viewport, canonical, favicons) — one `mlz preflight` command runs build + validate + inspect and returns a go/no-go report. Available as a CLI, MCP server, and REST API.

Trust and quality infrastructure for AI agents. 250+ quality-scored capabilities for company data, compliance checks, financial validation, web extraction, and more. Every capability has a transparent SQS quality score. 5 free capabilities — no API key needed.

Validate emails from your AI coding assistant. Syntax checks, MX verification, disposable detection, developer pattern intelligence, and typo suggestions. 1,000 free validations/month.

Validate and parse CUSIP and ISIN security identifiers using official checksum algorithms. Pure computation, no external dependencies. Used by trading platforms, portfolio tools, and fintech.

Helps AI agents read and write valid TEI XML. Look up elements, check what goes where, validate documents, and apply project-specific customisations. Provides 16 tools covering element/class/macro lookup, attribute resolution across the full class hierarchy, content model expansion, nesting validation, document and single-element validation, regex search, and ODD customisation support.

A powerful MCP server for JSON operations: pretty-print, minify, validate, diff two JSON objects, query with JSONPath, transform with templates, and generate JSON Schema. 6 tools, deployed on Cloudflare Workers with Streamable HTTP transport.

REST API + MCP Server giving AI agents real-world superpowers — web search, content extraction, screenshots, weather, finance, email validation, and translation. Zero AI cost.

AI-powered startup idea validation by a specialized 9-agent crew. Get market research, competitive analysis, and go/no-go signals for your startup idea. Services from $49 to $799 with 25% affiliate commissions for referring agents.

Validate AI claims against live data: check endpoints, count competitors, test hypotheses.

Validate AI claims against live data: check endpoints, count competitors, test hypotheses.

PhysBound is a specialized "Physics Linter" for AI that deterministically validates RF and thermodynamic claims against hard physical limits, preventing hallucinations in engineering workflows.

An MCP server that provides Email, Phone and Address Validation Services from Byteplant

Enrich contacts and companies via email/LinkedIn enrichment and email validation through LeadFuze (API key required).

A comprehensive JSON Schema validation server implementing the Model Context Protocol (MCP) with support for JSON Schema Draft 2020-12, external references, schema management, and real-time streaming validation.

High-performance XML file comparison with semantic analysis capabilities. Features StAX streaming parser for memory-efficient processing of large XML files (60MB+ tested), order-agnostic semantic comparison, and multiple output formats (text, JSON, Excel). Includes 5 MCP tools for comprehensive XML analysis and comparison.

QuerySculptor is a GraphQL query builder designed for AI agents that provides 26 structured tools via the Model Context Protocol (MCP). Instead of generating complex GraphQL queries from scratch, AI agents can build queries step-by-step with real-time validation, schema introspection, and error prevention. It works with Claude, Cursor, and other MCP clients, using Redis for session management and featuring a live demo with the Pokemon API. The tool transforms the traditional error-prone approach of raw GraphQL generation into a guided, conversational workflow perfect for AI assistants and chatbots.

Python MCP Server abstracting the official mermaid-cli for ease of use

zerobounce-mcp-server

This project provides an MCP-compatible interface for the JSONBuddy Core API, enabling JSON validation against schemas via a secure HTTP-based service. The server exposes two endpoints (`/validator/validate` and `/validator/validate-simple`) for flexible schema validation scenarios. MCP clients and AI agents can integrate this API using the included `mcp.json` definition and standard API key authentication.

Analyzes user-described build features (e.g. database, API integration, tools) and extracts core server requirements like resources, tools, prompts, external systems, and transports needed for MCP.

Mirror of

Test repository for GitHub MCP server validation

A lightweight Model Context Protocol (MCP) server that enables your LLM to validate email addresses. This tool checks email format, domain validity, and deliverability using the AbstractAPI Email Validation API. Perfect for integrating email validation into AI applications like Claude Desktop.

Serveur MCP (Master Control Program) pour n8n qui fournit des outils de validation de workflows et de bonnes pratiques pour vos projets d'automatisation

A test repository for MCP server functionality