MCP Server Directory

No longer maintained. Use the remote Upstash MCP server: https://mcp.upstash.com/mcp

constants io.github.constants-ai/constants

One workspace of tools for Claude and ChatGPT: connect 600+ apps, generate media, build tools.

Managed Apache Solr for agents: hybrid BM25+kNN search, server-side embeddings, RAG answers

Polymarket market data, live CLOB books, replay, simulation, and opt-in trading in Rust.

Convert PDFs and other documents to structured formats via Docling, for AI applications.

Approved acceptance criteria served over MCP to Claude Code, Cursor, or Codex. Git-only, sealed.

Flexim io.flexim/mcp

Manage Flexim CMS content and Suggested Topics from compatible AI clients.

academic-research-mcp com.themineworks/academic-research-mcp

Scholarly search: OpenAlex, Crossref, arXiv, OpenCitations and PubMed in one endpoint.

Self-hosted MCP gateway for Codex, Cursor, and Cline with provider-free prompt enhancement.

Harvest MCP by usefulapi io.usefulapi/harvest

Read time entries, projects, clients, tasks and invoices; log and update tracked time.

H/M Content Credentials Evidence Verifier net.hogarmas/content-credentials

Free C2PA 2.4 triage and reproducible official trust snapshot. No media, keys, or payment.

DiffBeam Gaussian Beam Optics com.gaussian-beam/diffbeam

Read-only optical catalog search plus DiffBeam server, schema, and catalog revision metadata.

teamo com.teamo360/teamo

Search, edit, design, and undo: everything you can do in Teamo, now from your AI assistant

AI Law Tracker com.ai-law-tracker/ai-law-tracker

Audited AI-regulation data: laws, bills, news and obligations across US, EU and 62 jurisdictions

Local secret & credential checks for AI-assisted dev — runs on your machine, results redacted.

Crimson Crawler com.crimsoncrawler/mcp-server

Enrich, search, assess, and manage threat intelligence through 80+ typed MCP tools.

x402 service-quality oracle: check a service's paid-probe quality tier and score before paying it.

Apple Podcasts Connect owner analytics over Reporter: plays, followers, episodes. Read-only.

DOS AI pro.dosai/dos-ai

Run WhatsApp, Instagram and Telegram AI assistants: projects, prompts, leads, chats, analytics.

Scoped IMAP/SMTP access over HTTP and MCP: read, organize, draft, reply and send mail.

postgres-kafka-prometheus-stack-generator ai.getvda/postgres-kafka-prometheus-stack-generator

Postgres + Kafka + Prometheus Stack Generator

USDC micropayments on Base + Solana via x402. BYO wallets. Cloudflare Workers. No Coinbase.

Koi-pond MCP server — varieties database (Gosanke + secondary), pond stocking calc, koi-specific

LeanrIQ io.github.leanrads/leanriq

Creative-intelligence MCP for campaign strategy, ad builds, QA, and reporting.