MCP Servers

What is known to be broken in an MCP server or API operation, with the check that found it

A

api-evangelist

apievangelist.com

Sixteen years of API research as MCP tools: stories, areas, governance blocks & services

Screenshot any URL/HTML as PNG/JPEG/WebP, or read it as clean Markdown/text for LLMs

Validates PESEL/NIP/REGON/IBAN/Luhn/ISBN/EAN/BIC/VAT; RPN, dates, hash, tokens, random, encode, time

Validates Luhn, IBAN, ISBN, EAN/UPC, SWIFT/BIC, and EU VAT checksums and formats

Returns the actual current date/time in a given format and IANA timezone

Date arithmetic: day differences, business days, age, leap years, day-of-week, add/subtract

Computes MD5, SHA1, SHA256, SHA512, and CRC32 digests from text, base64, or hex input

Validates Polish PESEL, NIP, and REGON checksums; PESEL also decodes birth date and sex

Generates cryptographically random integers in a given range, using crypto/rand

Regex matching, email/URL format validation, and JSON Schema validation

Evaluates Reverse Polish Notation (postfix) expressions: arithmetic, trig, logs, bitwise ops

Exact character/word counting, reversal, palindrome checks, indexing, sorting; Unicode-safe

Counts tokens under OpenAI-compatible (tiktoken) encodings, by model or encoding name

Search public Reddit posts, browse subreddit feeds, and read posts, comments, and profiles

A

APKCube

apkcube.com

Search Android apps, check APK signing and scans, and get verified APK download links.

Estimate automation cash costs, time-valued capacity and simple payback from your assumptions

Find the web app that fits a need — ranked by fit, with dated facts from each vendor's site

iOS App Store revenue and download estimates with confidence labels

AI app builder and APK maker for Android. Create and edit apps without coding

Check and appeal UK parking tickets (PCNs): grounds, deadlines, draft letters and filing

Free, no key: UK parking ticket appeal guides, PCN contravention codes and deadline calculator

App Store and Google Play revenue and download estimates, keywords, reviews, rankings and ads.

A

AppHitlist

apphitlist.com

App Store research: new winning apps, chart risers, revenue figures, complaints and Meta ads

EVM token risk checks, x402 payability check for sellers, address classifier and live gas

Find and verify work emails with live SMTP checks and catch-all detection. Free 10 calls/day.

Who can change an EVM contract or Safe: proxy admin, owner, Safe signers, timelock. Free alerts.

Find live startup/SaaS/AI launch directories, with submit URL and free/badge/queue/paid status

AI-agent operations for App Store Connect and Google Play, with approval before live publishing

App Store and Google Play screenshots, ASO text and feature graphics from your AI agent

D

docs

docs.applivery.com

Search and read the public Applivery docs (MDM & app distribution). Read-only, no auth

A

ApplyAll

applyall.com

Search for jobs and apply to jobs

Job search for your AI: save jobs, research companies, keep stories, track applications

A

Apply2Volunteer

applytovolunteer.com

Preview or grade a volunteer form. No API key. Free sign-up to publish.

V

Vigil

appnary.com

Shopify store security: find risky scripts and apps, and turn them off from your AI agent

A

Appraisily

appraisily.com

Check past auction prices in ChatGPT, plus appraisal prep and sample reports

C

Catalogue APP24, formations d'échecs en français

apprendre-les-echecs-24h.com

94 French-language chess courses, up-to-date prices, coach advice. French chess courses

Generate App Store and Play Store screenshots from your coding agent, at exact store sizes

Analyze your campaigns any way you want, with AI

Track your apps' keyword rankings, reviews and store listings on App Store, Google Play and more

AI-agent operations for App Store Connect and Google Play, with approval before live publishing

A

AppStorePack

appstorepack.com

Create App Store screenshots, app icons and store copy, then push them to App Store Connect

Ranked iPhone app lists by use case (S to F) from public App Store data. Read-only, no key

Create and monitor AppWizzy app environments from GitHub or ZIP with AI agents

GDPR-compliant ApyHub utility APIs hosted in the EU. Requires an EU-generated ApyHub API key

1,500+ ApyHub utility APIs served from the US cluster. Requires a US-generated ApyHub API key

Catalog, quotes, 44-FZ price justification and tender packages for locker-room furniture (RU)

A

Arbiter

arbiterscan.com

Security checks for apps built with AI: leaked keys, open routes, database rules, each with a fix

Read your store's AI traffic: AI agents, AI referrals, crawlers, blog traffic and AI-touched deals.

Checks any domain's DMARC, SPF, MX and DKIM setup, scores it 0-100, and ranks the fixes

A

Arcalune Music

arcalune.com

Search royalty-free BGM and sound effects (commercial use OK, no credit) and game fan arrangements

Arcana: San Francisco wine bar, restaurant, art space and music venue. Reservations, private events

A

Arc & Ledger Tax Reference

arcandledger.com

Read-only US tax reference for notices, deadlines, filing screens, and clearly labeled estimates

Tarot and Lenormand card meanings, Destiny Matrix calculations and Pythagorean Square calculations

Create epics, features, stories and tasks in Azure DevOps from a conversation

Korean premium short-term rental search: natural language or structured filters (SHV engine)

Search building products & manufacturers for AI agents: CAD, BIM, specs by CSI from arcat.com

Search and update ARCH-Insight: architecture fact sheets, applications, tickets, tasks, incidents

Shared memory across AI dev tools: each session hands its context to the next, not starting cold

S

Speed Reader

archerionlabs.com

Turn any article, document, or chat reply into a one-word-at-a-time RSVP reading session