MCP Server Directory

Pay-per-call developer utilities and npm supply-chain security tools for coding agents, over x402.

Mida so.mida/ab-testing

Create, run and analyze A/B tests and personalizations on your site with Mida.

CodeQR io.codeqr/codeqr

Create and manage CodeQR short links, QR codes, and analytics from any MCP client.

constitution-lint dev.agentopskit/constitution-lint

Static linter for CLAUDE.md-style agent constitution files: 10 operational-guardrail checks.

kr-district-codes io.github.HyosikPark/kr-district-codes

Free lookup of Korean district codes (LAWD_CD) for kr-apt-trades — paid per call (x402/credits), 1 …

safe4 ai.safe4/safe4

Tests an AI agent's purchase against the task it was given. Paid per call in USDC via x402.

version-truth ai.kaiv/version-truth

Latest versions, LTS windows, and EOL dates for 300+ products. Fresh ground truth for stale models.

AI visibility checker: does AI recommend your brand? GEO/AEO, runs locally, BYO keys. CLI + MCP.

Soleil Clusters com.soleilpictures/clusters

Read and build visual moodboards, shot lists and lookbooks from an AI assistant.

rombik app.rombik/rombik

Code → ДСТУ/GOST 19.701-90 (ISO 5807) flowcharts: 10 languages, 8 export formats, OAuth

Wraps the ContinuityGuard CLI as a single generic MCP tool for video-clip continuity scans.

TravelMind MCP online.trvaelmind/travelmind-mcp

TravelMind: 8 MCP tools for travel (12306 trains, flights, hotels, geocode, planning, policy).

R3 org.r3js/r3

Build 3D web apps: physics, audio, music, Blender import. Live edits, undo, versions, publishing.

Generate OpenAPI 3.1 specs, endpoint docs, TypeScript SDKs, and test suites from code

Durable, build-scoped reverse-engineering evidence memory and query tools for AI agents.

An MCP server that provides AI travel recommendations from Asian expats.

Snapshot tests and CI for agent workflows: record a run, replay it at 0 tokens, diff for drift.

Test whether AI agents retain critical instructions as conversations grow.

UpToCode io.github.DDYRich72/uptocode

Evidence-backed architecture-quality analysis for Python agent applications.

MCP Surface Lint io.github.DLeibner/mcp-surface-lint

Statically audits MCP tool surfaces for token cost, schema quality, and design issues.

bible-mcp io.github.nirajagarwal/bible-mcp

Bible corpus MCP server: scripture, Greek/Hebrew interlinear data, cross-refs, semantic search.

Whalesync com.whalesync/whalesync

Build and manage Whalesync syncs: connect apps, map tables and fields, monitor and fix issues.

Losbeto — Market Data for AI Agents io.github.rmartins1451/losbeto

Market data, LLM gateway, ML forecasts, batch+bundle, self-building catalog. USDC via x402 + MPP.

Audit a site's UX the way a design-literate reviewer would, with a concrete fix for every finding.