Sindri

Endpoints (65 live)

• POST /urlDecode — URL decoder API. Decodes percent-encoded URL text back to plain text. (0.01 USDC on Base)
• POST /generateInternetData — Network-format generator API. Generates a valid ipv4/ipv6 address (optionally within a CIDR block or named network range) or a well-formed JWT string (via one of: ipv4, ipv6, jwt). Accepts optional locale (default en_US). jwt header/payload objects are capped to 2000 serialized characters. (0.01 USDC on Solana)
• POST /generateUUID — UUID generator API. Generates a random RFC 4122 version 4 UUID using a cryptographically secure source — not the pseudo-random, collision-prone IDs an LLM would invent. No input required. (0.01 USDC on Base)
• POST /primeFactorize — Prime factorization of an integer via trial division, returning the full list of prime factors (with repetition). (0.01 USDC on Base)
• POST /getWeather — Live weather API. Returns real-time weather conditions, temperature, feels-like temperature, humidity, wind speed, precipitation, and UV index for any city worldwide — live external data an LLM cannot know on its own. Supports metric/imperial units, 74 languages, and optional 3-day forecast and sun/moon astronomy data. (0.01 USDC on Solana)
• POST /baristaFireCalculator — Barista FIRE calculator. Simulates net worth growth through a full-time-saving phase and then a reduced-target phase funded partly by part-time/side income after quitting full-time work, until full financial independence is reached. (0.01 USDC on Base)
• POST /fatFireCalculator — Fat FIRE calculator. Same year-by-year compound-growth simulation as the standard FIRE calculator, framed for a higher, more lifestyle-preserving retirement spending target. (0.01 USDC on Solana)
• POST /gasMileageSavingsCalculator — Gas mileage savings calculator. Compares annual fuel cost between two gas-powered vehicles based on miles driven, gas price, and each vehicle's MPG, and computes the break-even point for any price premium of the more efficient vehicle. (0.01 USDC on Solana)
• POST /cashOnCashReturnCalculator — Cash-on-cash return calculator for real estate investing. Runs a full multi-year deal analysis (per-category rent/expense growth, a sale scenario, IRR) and headlines the first-year cash-on-cash return: operating cash flow divided by invested cash. (0.01 USDC on Solana)
• POST /astronomyEphemeris — Sunrise, sunset, solar noon, day length, and moon phase for a given latitude/longitude/date, computed via the suncalc library (standard solar/lunar position algorithms) — precise astronomical math an LLM cannot reliably compute mentally. (0.01 USDC on Base)
• POST /cronParse — Computes the next N run times for a standard 5-field cron expression, avoiding the mental cron-schedule simulation an LLM often gets subtly wrong. (0.01 USDC on Base)
• POST /hsaGrowthCalculator — HSA (Health Savings Account) growth calculator. Projects year-by-year account balance from a starting value, annual contributions, annual expense withdrawals, and an annual return rate. (0.01 USDC on Solana)
• POST /solveLinearEquation — Solves a system of linear equations (Ax = b) using the ml-matrix library's LU decomposition (LuDecomposition), with a near-singularity guard beyond the library's exact-singular check, for systems up to 20x20. (0.01 USDC on Solana)
• POST /upworkFeeCalculator — Upwork freelancer fee calculator. Applies a documented tiered marginal service-fee schedule (20%/10%/5% at $500/$10,000 cumulative per-client lifetime billing thresholds) to compute take-home pay on an invoice, correctly splitting fees across a tier boundary like a tax bracket. Platform fee policies can change; verify current rates before relying on this for financial decisions. (0.01 USDC on Base)
• POST /bigNumberArithmetic — Arbitrary-precision integer arithmetic (add, subtract, multiply, power) beyond IEEE-754 float precision, using native BigInt. Operands are passed as digit strings so precision is never lost in transit. For power, the combined magnitude (base digit count x exponent) is capped at 50000 to bound response size, in addition to the per-operand digit cap and exponent cap. (0.01 USDC on Base)
• POST /unitConvert — Unit conversion for length, mass, volume, and temperature using exact conversion factors (temperature uses the correct affine formulas, not simple multiplication). (0.01 USDC on Base)
• POST /capRateCalculator — Cap rate calculator for real estate investing. Runs a full multi-year deal analysis (per-category rent/expense growth, a sale scenario, IRR) and headlines the capitalization rate: first-year NOI divided by purchase price. (0.01 USDC on Solana)
• POST /hybridVsGasSavingsCalculator — Hybrid vs gas savings calculator. Compares annual fuel cost between a hybrid and a conventional gas vehicle based on miles driven, gas price, and each vehicle's MPG, and computes the break-even point for the hybrid's price premium. (0.01 USDC on Base)
• POST /coastFireCalculator — Coast FIRE calculator. Computes the lump sum needed today, invested with zero further contributions, to grow into your full retirement number by your target retirement age, plus (given an ongoing monthly contribution) a year-by-year projection of when your actual trajectory crosses that lump sum. (0.01 USDC on Base)
• POST /chemicalElementLookup — Periodic table element lookup by symbol or atomic number, returning name, atomic mass, and category. Covers the most commonly referenced elements. (0.01 USDC on Base)

+45 more endpoints.