MCP Server Directory

12 calculators for AI cost, energy and agent verification. Free API, no key.

subproof us.artificl/subproof

Subcontractor COI & paperwork tracking for general contractors — read-only demo tools.

Look up Polish businesses in the GUS REGON register (BIR1) by NIP, REGON, or KRS.

constitution-lint dev.agentopskit/constitution-lint

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

MCP server for the Txtcel Solana protocol: agents post and read undeletable on-chain messages.

merona — x402 settlement index io.merona/settlement-index

See what actually settles on x402: wash-adjusted volume, payTo checks. Free, no key, no signup.

Fcc Ecfs io.github.pipeworx-io/fcc-ecfs

FCC Electronic Comment Filing System public search and retrieval.

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

Manage BlazingCDN from AI agents: CDN zones, cache, metrics, domains, cloud storage and video CDN

company-lookup io.github.xtrustinfo/company-lookup

Ukrainian business directory: companies, contacts and registry details (xtrust.info).

eSIM Eagle Plan Finder com.esimeagle/plans

Find public eSIM plans by destination, trip length, data needs, currency, and locale.

agentfeeds.jp jp.agentfeeds.api/agentfeeds

Japan regulatory, sanctions & DEX market data for AI agents via x402 (USDC on Base).

Fixzi — MCP & API Schema Drift Monitor io.github.rohitcodilya/fixzi-mcp

Monitor MCP servers, API contracts and AI outputs for schema drift. Alerts on breaking changes.

CLUBS Nippo place.clubs/nippo

AIエージェントが日報を自己報告提出・状態確認。OAuth 2.1+PKCE+DCR に加え Bearer 固定ヘッダ認証対応。

Derive to.derive/derive

Publish agent output to permanent versioned URLs, read review comments back, and revise.

YouTube data for agents sh.fetcher.youtube/mcp

15 YouTube endpoints. Pay per call in USDC via x402.

Money-Engine x402 Research com.devvizion/x402-research

Free agent discovery + paid x402 research (outline 0.01 / brief 0.02 USDC Base).

Search public Ashby job boards: resolve a company, read its openings and the pay it publishes.

gateway io.github.toolhail/gateway

Find and call the right MCP server for any task - pay per use, no install.

MyHairMail Agent Tools com.myhairmailtools/agent-tools

Open, read-only wig stock, restock ETAs and cross-brand color matching. No key; fair-use limits.

Spec-Driven Development workflow: specs, plans, gates, status and logbook tools. Bilingual EN/ES.

Simap io.github.pipeworx-io/simap

simap MCP — Swiss public procurement tenders and awards (keyless).

Simulate, generate and draw analog circuits in Micro-Cap 12: SPICE analyses, sweeps and schematics

novel-mcp · Chinese Web Novel Writing System top.novelmcp/novel-factory

Chinese web novel MCP: 36 tools (outline, prose, review, coach, KD export). BYOK, no API key.