Income Tax Brackets retrieves federal income tax brackets, marginal rates, and standard deductions across all US filing statuses. Paid plans can query specific historical tax years back to 2000.

Income Tax Calculator computes US federal income tax and take-home pay from gross income and filing status. It outputs total tax owed, effective and marginal rates, standard deductions, and net monthly income.

Inflation Rate reports annual inflation rates and Consumer Price Index (CPI) values for any country by two-letter country code. Outputs include the year-over-year price change percentage, CPI index, and base comparison year, with paid plans supporting historical lookups by year.

Initialism Generator creates initialisms from phrases by extracting first letters of significant words, with options for filtering and formatting.

Insider Trading returns recent SEC Form 4 insider transactions for a US public company by ticker - who bought or sold, their role, the number of shares, price and transaction type - plus a derived insider-sentiment summary with net buy/sell activity and cluster-buy detection calculated for you.

Interest Rate retrieves central bank policy rates for 22 major economies by country code. It delivers the latest interest rate percentage, central bank name, recorded date, and whether the rate moved up, down, or remained unchanged.

Invoice Generator is an invoice generation API that creates downloadable PDF invoices from party addresses, line items, and payment terms. It computes subtotals with discounts and sales tax, returning an expiring download link.

IP Blacklist Lookup is an IP blacklist check API that tells you whether a given IP address appears on known malicious IP blocklists. Identifies both inbound threats (attackers, spammers) and outbound threats (C2 servers, malware hosts).

IP Demographics combines IP geolocation with Census demographic data to provide demographic information for any IP address. Get location, income, education, and housing data based on the IP's geographic location. Demographics cover US ZIP codes; other locations return the location with demographi...

IP Lookup is an IP address location API that resolves any IP to its country, region, timezone and continent. Paid plans add city, coordinates, postal code, an accuracy radius and an EU-membership flag for compliance routing.

ISBN Validator checks ISBN-10 and ISBN-13 numbers for valid checksums and parses their registration group, publisher, and title parts. Pass any raw book identifier with or without hyphens to inspect normalized digits, format type, and specific rejection reasons.

Job Postings is a jobs API that returns the open positions on a company's public career board. Every job comes back in the same shape: title, department, team, locations, remote and workplace type, employment type, posting date and apply link. Filter by keyword, location, department, employment t...

Job Search is a jobs API that searches the open positions at thousands of companies at once. Search by job title keywords, location, country, remote work, employment type, posting date or company, and get the newest matching jobs first, each with its title, company, location, country, workplace t...

Jobs Report provides monthly US employment data including unemployment rate, total employment, labor force participation, and employment by industry sector. The same data released in the monthly BLS jobs report.

JSON Schema Generator is a JSON to JSON Schema API: it inspects sample JSON payloads and generates Draft-07 JSON Schema definitions with inferred types and property formats. It identifies formats like emails and dates, applies custom titles, and lists all properties as required.

JSON Schema Validator is a JSON validator API that tests any JSON object against a JSON Schema you provide, so you can check JSON against its schema before trusting it. It reports pass-fail status and total error count, while paid plans add specific error messages.

JSON to CSV Converter converts an array of JSON objects into structured CSV text. It outputs formatted CSV content, detected column headers, and row counts, with support for custom delimiters like commas, tabs, or pipes.

JSON to JSONP wraps JSON data in a JavaScript callback function to produce valid JSONP output. Pass an object or JSON string with an optional callback identifier to receive the formatted script string.

Julian Day Calculator converts between Gregorian calendar dates and Julian Day Numbers (JDN). Julian Day is a continuous count of days used in astronomy and historical research.

JWT Decoder decodes JWT tokens to reveal header and payload information without performing signature verification. It handles JSON web token decode from any language over REST, so you can inspect claims and expiry without adding a JWT library.