26 #validation MCP Servers & Clients

Data247

LogicTreeInc

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 verifi

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.

Demand Discovery AI

demand-discovery-ai

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),

Localecheck

qinisolabs

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.

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

Physbound

JonesRobM

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

MCP Server Validation

hamnhugs

Test repository for GitHub MCP server validation

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

Xml Comparison Mcp Server

ravikalla

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 fo

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

Veridigit

qinisolabs

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.

IBAN validation & BIC/SWIFT lookup API for AI agents. 75+ countries, 39K+ GLEIF entries, SEPA compliance data, issuer classification (vIBAN detection),

JSONBuddy Data Validator

Clemens-U

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 scenari

Sms Validator X402

Br0ski777

Validate SMS-capable phone numbers -- mobile vs landline detection, carrier type, E.164 format, SMS readiness. -- x402 micropayment API + MCP server for AI agents

MCP server providing European data validation and formatting tools for AI agents.

IBAN Checker MCP

koraykoylu

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.

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 expansi

CUSIP/ISIN Validator — Security Identifier Validation

easysolutions906

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.

Fixzi AI Validator

rohitcodilya

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

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.

Schemacheck Agent

garyedgington

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

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.

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.