Tanod
Pay-per-call scans of smart contracts, addresses and MCP/skill packages; small free daily tier
Security · No auth · HTTPS
Search the API archive · Page 48
Page 48 of 215
Ordered by reported HTTPS, CORS support, no-auth access, then changed/observed facts. Access signals are not a popularity or quality score.
W3C Validator
Validate HTML and check markup errors
Development · No auth · HTTPS
DailyMed
FDA drug labeling and package insert information
Health · No auth · HTTPS
KEGG
Genes, pathways, compounds and reactions
Science & Math · No auth · HTTPS
MangaUpdates
Manga database: series, releases, groups and reading lists
Anime · No auth · HTTPS
Pumperly
Fuel prices and EV chargers near a point, in a map area or along a route, as GeoJSON
Transportation · No auth · HTTPS
SatNOGS
Satellite observations from open ground stations
Science & Math · No auth · HTTPS
WoRMS
Marine species taxonomy, synonyms and distributions
Science & Math · No auth · HTTPS
Open Government, Singapore
Singapore Government Open Data
Government · No auth · HTTPS
DoughMatrix
Sourdough and pizza dough formula calculators: true hydration, DDT, fermentation windows
Food & Drink · No auth · HTTPS
Queimadas INPE
Access to heat focus data (probable wildfire)
Geocoding · No auth · HTTPS
Songsterr
Provides guitar, bass and drums tabs and chords
Music · No auth · HTTPS
Lacuna
Public board where AI agents post problems as seeks and agents who solved them offer help
Machine Learning · No auth · HTTPS
NOAA CO-OPS
US coastal tides, water levels, currents and meteorological observations
Weather · No auth · HTTPS
Boletín Oficial del Estado (BOE)
Official Spanish State Gazette open data: laws, summaries and XML/JSON APIs
Government · No auth · HTTPS
arXiv
Curated research-sharing platform: physics, mathematics, quantitative finance, and economics
Science & Math · No auth · HTTPS
OpenSky Network
Free real-time ADS-B aviation data
Transportation · No auth · HTTPS
owo
A simple link obfuscator/shortener
URL Shorteners · No auth · HTTPS
CityAlert
Live public-safety incidents: crime, fire, disaster, weather and news from 650+ official feeds
Open Data · No auth · HTTPS
Nerkhsanj
Iran free-market USD, EUR, CNY, gold and coin rates in toman, live and daily archive since 2010
Currency Exchange · No auth · HTTPS
UGC VZ
Directory of DACH user-generated-content creators with topics, cities, rates and contact requests
Business · No auth · HTTPS
API Tool Calls
API Tool Calls: Home cost planners, page to Markdown, SEO checks and recalls
Development · No auth · HTTPS
Dudelytics
Productive crypto indices, daily benchmarks, sector indices and market-stress data
Cryptocurrency · No auth · HTTPS
Agent Verifier
Self-check for AI agents: verifies Web Bot Auth signatures and shows how a request looks
Security · No auth · HTTPS