Silver Price quotes spot silver prices per troy ounce, gram, and kilogram in US dollars, including 24-hour price change and trend direction. Paid plans can request quotes across 172 currencies, 24-hour high and low ranges, and hourly price snapshots.

Sitemap Generator is a website sitemap generator API that creates valid XML sitemaps from URL lists following the sitemaps.org protocol for search engine optimization.

Slot Machine Simulator generates slot machine reel spins for configurable reels, bet sizes, and spin counts. Every run outputs symbol names and emoji for each reel; paid plans add payout calculations, win tracking, and net profit statistics.

Slugify converts text into clean, URL-friendly slugs with custom separators and optional lowercase formatting. Pass any raw string to get back the original text and its normalized slug with accents stripped and spaces replaced.

Solar Potential calculates solar energy potential for any latitude and longitude coordinates. It returns average daily usable sunlight hours and optimal panel orientation, with paid plans adding yearly totals and cloud factors.

Spam Detector is a spam detection API that evaluates text submissions to determine whether content is likely spam. Pass a message body and an optional sender email to check for spam patterns, with paid plans adding IP blocklist and disposable email checks.

Spell Checker flags misspelled words in submitted English text and generates correction suggestions. It counts total spelling errors and lists possible replacements for each mistaken word.

Spelling Bee Generator creates word puzzles with 7 letters where players form words using a required center letter.

SPF Validator checks the Sender Policy Framework (SPF) DNS record for a domain to verify if it’s valid and optionally whether a given IP address is authorized to send emails for that domain.

SQL Explainer analyzes SQL queries and provides clear, plain English explanations of what they do. Perfect for learning SQL, code reviews, or documentation.

SRV Record Parser analyzes DNS SRV records and extracts service location information including priority, weight, port, and target server details.

SSL Checker is an SSL certificate API that connects to a website and checks its live certificate in seconds. It returns the certificate details, whether the chain verifies to a trusted root and matches the hostname, the negotiated TLS version and cipher, HSTS and OCSP stapling, plus expiry signals: valid or expired, days until expiry, expiring soon and self-signed.

Stars Lookup retrieves physical and positional stellar data by star name or astronomical classification. Query individual stars or filter by spectral class to obtain mass in kilograms, distance in light-years, and stellar type.

State Boundaries provides GeoJSON data and Census identifiers for US states using a two-letter postal code. Responses include the state name, FIPS code, and GEOID; paid plans add border polygon coordinates and land area measurements.

Stock Exchange identifies trading venues worldwide by Market Identifier Code, name, or country. It provides official exchange names, acronyms, host cities, websites, and founding dates, while paid plans add regulatory MIC and LEI identifiers.

Stock Index is a tool for retrieving current and historical stock market index values. It supports the S&P 500, Dow Jones, Nasdaq Composite, VIX, Nikkei 225, and more.

Stock Market Open Times checks if a global stock exchange is currently trading and provides its opening and closing times. Pass an exchange code like NYSE or LSE to get current open status, official exchange name, and session hours.

Street Address Parser is an address parsing API that breaks raw US street addresses into structured location components. Pass any single-line address string to extract the building number, street name, street type, city, state abbreviation, and postal code.

Subdomain Finder discovers active subdomains and their resolved IP addresses for any target domain. It checks certificate transparency logs and common hostnames, returning matched hostnames, root A records, and scan completion status.

Sudoku Generator creates 9x9 Sudoku puzzle grids across multiple difficulty settings, with empty cells marked as zeros. Paid plans add the full solution grid for validation or hints.