Public APIs with no API key — page 31

Bitcoin height, fees, mempool and peer data served live from two self-hosted nodes

Bitcoin blockchain data, fees, mempool, SEC insider trades, Reddit sentiment. x402 micropayments for paid endpoints.

Source-reviewed energy company knowledge graph and directory exports

Public holidays for 195+ countries

Visa and entry requirements for 199 passports, cited to official sources, verified daily

Card BIN/IIN lookup: network, issuer, country and card type for the first 6-8 digits

Neko images, funny GIFs & more

Structured changelog metadata from open source projects

EV charging sites in AU, NZ, US, UK and Canada, with nearby search and trip planning

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Catholic liturgical calendar

Live public-safety incidents: crime, fire, disaster, weather and news from 650+ official feeds

Convert cookie formats, check Claude sessions and generate Claude Code credentials

API calculates and validates the carbon footprint

The Postman Documenter generates and maintains beautiful, live documentation for your collections. Never worry about maintaining API documentation again.

US college admission chance estimates and admissions data for 1,100+ colleges

Color Palette Generator

Brazilian payroll and labor calculations: net salary, INSS, IRRF, unemployment insurance

Spain: IBAN validation with bank and BIC, EU VAT number check (VIES), Modelo 303 VAT sums

Corporate, government and ETF Bitcoin, Ethereum and Solana treasury disclosures

Natal charts and sky events computed from Swiss Ephemeris

Museum and gallery jobs from 400+ institutions' own careers pages, with advertised salaries

Cross-brand carbide insert grade equivalents by ISO application class

Interpreted astronomy: sun and moon times, moon phases, planets, eclipses, seasons