Every server in the official MCP Registry. Ranked by whether they actually work: we connect to each one and publish what happens.
18,856 servers
Agent-speed defense for your own public surfaces: daily diff probes, per-identity verdicts.
MinIO and Redis Storage Stack
X (formerly Twitter): X (formerly Twitter) public and private data API for search, posts (Tweets).
Cloudflare Workers MCP server: ai-cost-optimizer
Systematic medical reviews and evidence-based healthcare research
Galleries, uploads, sharing and captions in your SmugMug account.
Marine weather: NOAA buoy obs, waves, wind. $0.01/query. Be born in one call — free testnet funds.
Weather now and 9-day forecasts anywhere (MET Norway) and Great Britain place-name lookup
Since Jan 2025, Arena's #1 spot has changed hands 16 times. Half of the finished reigns lasted.
Search LOC digital collections, Chronicling America newspapers (full OCR), and LC Subject Headings.
Create PDF documents from your request. Preview the content first, then download when ready.
SENATRAN: Download Infração, official-source lookup. Platform-hosted, pay per query with prepaid cre
Сімферополь territorial MCP, Ukraine. KATOTTG UA01160330010074014. Administrative hierarchy.
Deterministic Scope 1/2/3 GHG inventories with bundled factors and audit hashes.
QuantumOracle — 18 post-quantum crypto tools: Kyber, Dilithium, hybrid schemes, migration.
Contradiction-verified, freshness-SLA'd signed feed: per-record status + as-of date + receipt.
Pull property listings, prices, and details from real-estate sites as structured JSON.
Resize, convert, compress, crop and thumbnail images, and strip EXIF and GPS metadata.
ActiveCampaign MCP Pack — email marketing + CRM (API v3).
Software end-of-life dates, open-source licenses, browser support for web features and RFC facts.
Latest 10-K, 10-Q and 8-K filings for any US-listed company, with 8-K red flags decoded.
Find a state-licensed psilocybin center by city.
Kafka and Postgres Monitoring Stack
Cloudflare Workers MCP server: llm-output-quality-monitor
Job descriptions, skills, education requirements, and wage data
Client galleries, orders, contracts and invoices in ShootProof.
Latest science news: research & discoveries. $0.01/query. Be born in one call — free testnet funds.
Agent utilities: RDAP domain lookup, unshorten URLs, HTTPS checks, QR codes, calendar invites
Anthropic builds 14 of the Arena's top 50 models and OpenAI builds 5. But 44% of US adults use.