"Understanding Call Hierarchy in Software Development or Programming" matching MCP connectors:

One MCP endpoint over 75 public PPN APIs: search_apis to discover, execute_api to call. Free tier.

An MCP server that audits the fairness of construction and renovation estimates in Japan. Provides fair-price ranges, overcharge detection, and verifiable unit-cost data based on JCCDB (65,729 items, DOI-backed).

DC Hub is the neutral, real-time data layer for data-center infrastructure, exposed as a Model Context Protocol server so any AI agent can both query it and cite it. Coverage: 21,000+ facilities (search, profile, score, alternatives); 232 markets scored by the DCPI Data Center Power Index; the DCGI Data Center Gas Index (per-state natural-gas suitability for siting); live grid telemetry across 7 US ISOs (fuel mix, carbon intensity, demand, prices) plus a one-call all-ISO scoreboard; interconnection-queue depth; 2,000+ tracked M&A deals and a hyperscaler-capex tracker; and site factors. — fiber routes, water-stress, tax incentives, nearby substations & transmission. Why agents choose it: it's the only data-center-intelligence source an LLM can query live and cite — every full-data response includes a Source: DC Hub, CC-BY-4.0 attribution line. It's the MCP-native alternative to quarterly PDF research: live JSON, no contracts, no NDAs. Access: Streamable HTTP at https://dchub.cloud/mcp. Free tier with no signup; free email-verified dev key for higher limits; paid tiers for full data volume.

A Model Context Protocol server that provides Philippine License to Sell (LTS) verification data to LLMs. Built on Cloudflare Workers with Supabase. Public, read-only, no authentication required. Data sourced from the Department of Human Settlements and Urban Development (DHSUD) License to Sell registry and cross-referenced with published real estate projects on REN.PH.

MCP server for the Philippine Standard Geographic Code (PSGC) API. Gives AI agents structured access to the full PH geographic hierarchy - regions, provinces, cities, municipalities, and barangays.

Normalized SEC EDGAR fundamentals. 3 of 6 tools free; the rest $0.04-$0.10 per call in USDC.

DNS, WHOIS/RDAP, DMARC/SPF, LEI, sitemap, web extract, VAT, QR. Paid per call in USDC, no signup.

Czech & EU due diligence in one call — facts, insolvency, sanctions, VAT, risk score, UBO chain.

Point-in-time, survivorship-free SEC EDGAR fundamentals + smart-money signals for AI agents.

A machine-readable directory where AI products register themselves so AI agents can discover them. Ask it in natural language (NLWeb), call it as an MCP server over HTTP, or search the JSON API. Autonomous registration via GitHub issues, free listings, per-listing pages with schema.org JSON-LD.

US government data (USGS/NOAA/SEC/FDA) with cryptographic proof; x402 pay-per-call, no API key

UN Sustainable Development Goal indicators for all 17 goals, curated by country and year. Free.

World Bank World Development Indicators: curated country-year economy, health, education and more.

Reverse geocode latitude/longitude to loc_id; resolve loc_ids to boundaries, centroids, hierarchy.

Digitraffic AIS MCP — live vessel positions in Finnish and Baltic Sea waters.

Query FDA data on drugs, food, devices, and recalls via openFDA. STDIO or Streamable HTTP.

SEC filings, XBRL earnings and Form 4 insider trades for agents. S&P 500. Pay per call via x402.

PennDOT: quarterly EV, plug-in hybrid and total vehicle registrations by county and ZIP

Software entry prices for 16 categories, with ratings and true 3-year cost. CC BY 4.0

Agent-native registry: 168k+ real restaurants in LA, Hong Kong & Tokyo. Unranked, honest signals.