"Services or tools that don't require a separate API key" matching MCP connectors:

Biorhythm cycles, forecasts, critical days and compatibility for AI agents, one API key.

Dream symbol interpretation and dream-dictionary lookups for AI agents, one API key.

Uphealth Signal turns federally-sourced (CDC/NIH/MedlinePlus) health facts, lists, and tips into agent-callable cued-stream tools. Every cue is provenance-backed, audience-safety-checked, and sequenced on the patient's last response, so your AI health agent never fabricates health content. Free sandbox (Display mode): no PHI, no BAA. Not medical advice.

Appendix turns any AI health conversation into a board-certified physician's opinion — with a real prescription when clinically appropriate. Search medical literature and submit a clinical encounter for review, all from your agent.

Chilean online mental-health clinic (Spanish): articles, professionals, availability, tests.

Editorially independent addiction & mental-health directory — facilities, therapists, expert Q&A.

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

French HACCP for restaurants: temperatures, DLC, allergens, DDPP controls, live recalls. Sourced.

HealthData.gov MCP — wraps HealthData.gov CKAN API (free, no auth)

MyHealthfinder MCP — U.S. preventive-services & health-screening guidance

Wger MCP — wraps wger Workout Manager REST API (free, no auth for read)

Consent-gated tools that turn user health notes into non-diagnostic appointment-prep materials.

Search source-labeled hospital prices, CPT codes, providers, and healthcare cost estimates.

Free hosted MCP server by Baby Age Calculator: exact baby age, zodiac, and milestone dates. No key.

Hosted MCP server for solar vitamin D. Six public tools, no account needed: find a city, sun times and golden hour, the synthesis window for a day, the whole year of viable months at a latitude, whether right now is a good moment from live UV, and what a sun session produced. Four more read a signed-in user profile, cities and sun history over OAuth 2.1. Built on NOAA solar geometry, a Madronich clear-sky UV model with ozone, MED by Fitzpatrick skin type, and live Open-Meteo data.

Spoonacular food API: recipes, nutrition, ingredients, meal plans. Free 150/day.

Natural-language calorie lookup. Send '2 large eggs', get USDA-sourced nutrition data.

Deterministic fitness calculators — TDEE, adaptive TDEE, body fat, 1RM, macros — with consensus.

Product evaluation MCP server for US packaged food. Health scores, ingredient safety, regulatory flags, recall history, corporate ownership.

Discover Swedish MSK clinics on fysio.care: search clinics, services, and open appointment times.