# Services from x402.outpimp.com on Zero

> x402.outpimp.com serves 65 paid API services for AI agents, indexed by Zero. Each is callable per call with payment handled by Zero.

Canonical page: https://www.zero.xyz/host/x402.outpimp.com
Live health (JSON, refreshed every minute): https://www.zero.xyz/host/x402.outpimp.com/health.json

## Services

- [x402.outpimp.com Base64 Encoder](https://www.zero.xyz/c/x402-outpimp-com-base64-encoder-19d673d9/llms.txt): $0.01/call via x402. Encodes UTF-8 plain text to a base64 string, handling padding and edge cases correctly.
- [Sindri Primality Test (Miller-Rabin)](https://www.zero.xyz/c/sindri-primality-test-miller-rabin-6980a7e8/llms.txt): $0.01/call via x402. Tests whether a given non-negative integer is prime using a deterministically correct Miller-Rabin algorithm, covering all integers up to 2^53-1 (JavaScript safe integer range).
- [Sindri Big Number Arithmetic](https://www.zero.xyz/c/sindri-big-number-arithmetic-a8d80da1/llms.txt): $0.01/call via x402. Performs arbitrary-precision integer arithmetic (add, subtract, multiply, power) on numbers passed as digit strings, bypassing IEEE-754 float limits
- [Sindri Electric Car Savings Calculator](https://www.zero.xyz/c/sindri-electric-car-savings-calculator-70e0148f/llms.txt): $0.01/call via x402. Calculates annual electricity vs. gas costs for EV ownership, computing break-even years, cost per full charge, and effective gas-equivalent MPG given vehicle specs and local energy prices.
- [Sindri Mortgage Comparison Calculator (15-Year vs 30-Year)](https://www.zero.xyz/c/sindri-mortgage-comparison-calculator-15-year-vs-30-year-0a089bfb/llms.txt): $0.01/call via x402. Computes and compares monthly payments and total lifetime interest for 15-year and 30-year fixed mortgages on the same property, reporting the tradeoff between the two loan terms.
- [Sindri Regex Test (ReDoS-Safe)](https://www.zero.xyz/c/sindri-regex-test-redos-safe-62f10774/llms.txt): $0.01/call via x402. Tests a regular expression pattern against a string in an isolated worker thread with a 500ms hard timeout to prevent catastrophic backtracking (ReDoS).
- [Rental Property Investment Calculator](https://www.zero.xyz/c/rental-property-investment-calculator-82e9dde8/llms.txt): $0.01/call via x402. Performs full multi-year rental property deal analysis including mortgage amortization, per-category rent/expense growth, sale scenario, IRR, cumulative totals, NOI, cap rate, and cash-on-cash return.
- [x402.outpimp.com UUID Generator](https://www.zero.xyz/c/x402-outpimp-com-uuid-generator-6e07039f/llms.txt): $0.01/call via x402. Generates a cryptographically secure random RFC 4122 version 4 UUID with no input required.
- [Coast FIRE Calculator](https://www.zero.xyz/c/coast-fire-calculator-22314161/llms.txt): $0.01/call via x402. Computes the coast FIRE lump sum needed today to reach your retirement number by a target age, plus a year-by-year projection of when your savings trajectory crosses that threshold given ongoing contributions.
- [x402.outpimp.com Secure Password Generator](https://www.zero.xyz/c/x402-outpimp-com-secure-password-generator-1807c545/llms.txt): $0.01/call via x402. Generates a cryptographically random password with configurable length, character classes, and an optional pronounceable mode
- [House Hacking Calculator](https://www.zero.xyz/c/house-hacking-calculator-b5c693b0/llms.txt): $0.01/call via x402. Computes the true monthly net-worth impact of a house hack by netting rental income against mortgage, taxes, insurance, HOA, and maintenance, then adding back principal paydown equity and rent savings from living in the property.
- [Hybrid vs Gas Savings Calculator](https://www.zero.xyz/c/hybrid-vs-gas-savings-calculator-f1a742bf/llms.txt): $0.01/call via x402. Compares annual fuel costs between a hybrid and a conventional gas vehicle, and computes the break-even payback period for the hybrid's price premium.
- [Sindri Loan Payment Calculator](https://www.zero.xyz/c/sindri-loan-payment-calculator-42a92a9f/llms.txt): $0.01/call via x402. Computes the fixed monthly payment for an amortizing loan and returns a full month-by-month amortization schedule with principal, interest, and remaining balance for each period.
- [Sindri Astronomy Ephemeris](https://www.zero.xyz/c/sindri-astronomy-ephemeris-b7efd6de/llms.txt): $0.01/call via x402. Returns sunrise, sunset, solar noon, day length, and moon phase for a given latitude, longitude, and date using precise astronomical algorithms.
- [MD5 Hash Generator](https://www.zero.xyz/c/md5-hash-generator-85b1852b/llms.txt): $0.01/call via x402. Computes the MD5 hex digest of any input text string, returning the deterministic 32-character hexadecimal hash.
- [SHA-256 Hash Generator](https://www.zero.xyz/c/sha-256-hash-generator-466d0417/llms.txt): $0.01/call via x402. Computes the SHA-256 hex digest of any input text string, returning a deterministic 64-character hexadecimal hash.
- [Purchase Impact on FIRE Timeline Calculator](https://www.zero.xyz/c/purchase-impact-on-fire-timeline-calculator-ff9ac968/llms.txt): $0.01/call via x402. Calculates how many years a one-time purchase delays financial independence by running the FIRE net-worth simulation with and without the purchase deducted.
- [x402.outpimp.com Live Weather API](https://www.zero.xyz/c/x402-outpimp-com-live-weather-api-3aac2840/llms.txt): $0.01/call via x402. Returns real-time weather conditions including temperature, humidity, wind, precipitation, UV index, and optionally a 3-day forecast and astronomy data for any city worldwide.
- [Windfall FIRE Impact Calculator](https://www.zero.xyz/c/windfall-fire-impact-calculator-a08ab6d5/llms.txt): $0.01/call via x402. Runs the FIRE net-worth simulation with and without a one-time windfall and reports how many years the lump sum shaves off your time to financial independence.
- [Keeping Up With Inflation Calculator](https://www.zero.xyz/c/keeping-up-with-inflation-calculator-cf5fd9b2/llms.txt): $0.01/call via x402. Computes the pre-tax raise needed to offset inflation under two scenarios: maintaining the same dollar savings amount or the same savings rate, accounting for marginal tax on the raise.
- [x402.outpimp.com Email Validation API](https://www.zero.xyz/c/x402-outpimp-com-email-validation-api-15ea14ad/llms.txt): $0.01/call via x402. Checks whether a given string is a syntactically valid email address, returning true or false using a production-grade validation library.
- [Sindri JSON Schema Validator](https://www.zero.xyz/c/sindri-json-schema-validator-cd0ecdca/llms.txt): $0.01/call via x402. Validates a JSON document against a provided JSON Schema using the ajv validator, returning a validity flag and human-readable error messages.
- [Sindri Arithmetic Expression Evaluator](https://www.zero.xyz/c/sindri-arithmetic-expression-evaluator-8fb71813/llms.txt): $0.01/call via x402. Parses and evaluates arithmetic expressions (+, -, *, /, ^, parentheses) using a safe bounded-recursion parser with no eval or Function calls, avoiding LLM arithmetic errors.
- [Cash-on-Cash Return Calculator for Real Estate](https://www.zero.xyz/c/cash-on-cash-return-calculator-for-real-estate-b91252c0/llms.txt): $0.01/call via x402. Runs a full multi-year real estate deal analysis including per-category rent/expense growth, sale scenario, and IRR, returning the first-year cash-on-cash return (operating cash flow divided by invested cash).
- [Sindri FIRE Calculator](https://www.zero.xyz/c/sindri-fire-calculator-6bfd8951/llms.txt): $0.01/call via x402. Projects year-by-year net worth growth via compound simulation to determine how many years until a portfolio can sustainably fund retirement at a given safe withdrawal rate
- [x402.outpimp.com Currency Exchange Rate API](https://www.zero.xyz/c/x402-outpimp-com-currency-exchange-rate-api-0110e330/llms.txt): $0.01/call via x402. Returns the live exchange rate between any two ISO 4217 currency codes via a paid API call
- [x402.outpimp.com Base64 Decoder](https://www.zero.xyz/c/x402-outpimp-com-base64-decoder-fac2d0d6/llms.txt): $0.01/call via x402. Decodes a base64-encoded string back to UTF-8 plain text, avoiding padding and charset errors that LLMs typically make when decoding by hand.
- [Cap Rate Calculator for Real Estate Investing](https://www.zero.xyz/c/cap-rate-calculator-for-real-estate-investing-c703a4a8/llms.txt): $0.01/call via x402. Runs a full multi-year real estate deal analysis including per-category rent/expense growth, a sale scenario, and IRR, with the capitalization rate (first-year NOI ÷ purchase price) as the headline output.
- [Sindri Cron Expression Next-Run Calculator](https://www.zero.xyz/c/sindri-cron-expression-next-run-calculator-6c27c123/llms.txt): $0.01/call via x402. Computes the next N future run times for a standard 5-field cron expression, returning precise timestamps without LLM simulation errors.
- [Barista FIRE Calculator](https://www.zero.xyz/c/barista-fire-calculator-cc81e10c/llms.txt): $0.01/call via x402. Simulates net worth growth through a full-time saving phase followed by a part-time/side-income phase (barista FIRE), projecting when full financial independence is reached.
- [Sindri Portfolio Rebalancing Calculator](https://www.zero.xyz/c/sindri-portfolio-rebalancing-calculator-9f92bf2e/llms.txt): $0.01/call via x402. Computes the dollar gap per asset and monthly buy/sell amounts needed to reach a target allocation over a chosen rebalancing period.
- [Sindri Descriptive Statistics Summary](https://www.zero.xyz/c/sindri-descriptive-statistics-summary-2eaa3189/llms.txt): $0.01/call via x402. Computes descriptive statistics (mean, median, variance, standard deviation, and 25th/75th/90th percentiles) over a numeric array of up to 10,000 elements using R/numpy-compatible interpolation.
- [x402.outpimp.com Live Cryptocurrency Price API](https://www.zero.xyz/c/x402-outpimp-com-live-cryptocurrency-price-api-77448aff/llms.txt): $0.01/call via x402. Returns the current live market price in USD for any cryptocurrency by ticker symbol (e.g. BTC, ETH, DOGE)
- [Sindri Checksummed Identifier Generator](https://www.zero.xyz/c/sindri-checksummed-identifier-generator-dde334c3/llms.txt): $0.01/call via x402. Generates structurally valid checksummed identifiers (ISBN, UPC, VIN, IMEI) with real check-digit algorithms
- [Tesla Savings Calculator](https://www.zero.xyz/c/tesla-savings-calculator-2f7a16df/llms.txt): $0.01/call via x402. Compares annual electricity vs. gas costs for a Tesla vs. a comparable gas vehicle, computing break-even years, cost per full charge, and effective gas-equivalent MPG
- [Gas Mileage Savings Calculator](https://www.zero.xyz/c/gas-mileage-savings-calculator-77ae4951/llms.txt): $0.01/call via x402. Compares annual fuel costs between two gas-powered vehicles and computes the break-even point for any price premium of the more efficient vehicle.
- [x402.outpimp.com Slug Generator](https://www.zero.xyz/c/x402-outpimp-com-slug-generator-ac4c4943/llms.txt): $0.01/call via x402. Converts any text into a clean, URL-safe slug (lowercase, hyphen-separated, unicode-aware) with correct handling of punctuation and accented characters.
- [Sindri QR Code Generator](https://www.zero.xyz/c/sindri-qr-code-generator-bc78c1ed/llms.txt): $0.01/call via x402. Generates a QR code image for any text or URL and returns it as a base64-encoded PNG data URL, computed entirely locally.
- [Sindri Scientific Unit Converter](https://www.zero.xyz/c/sindri-scientific-unit-converter-142efe90/llms.txt): $0.01/call via x402. Converts numeric values between units of pressure, energy, and molarity using exact scientific conversion factors.
- [Sindri Fat FIRE Calculator](https://www.zero.xyz/c/sindri-fat-fire-calculator-f7b1a7b8/llms.txt): $0.01/call via x402. Runs a year-by-year compound-growth simulation to compute how long until you can retire on a higher, lifestyle-preserving spending target using Fat FIRE principles.
- [Sindri Color Format Converter](https://www.zero.xyz/c/sindri-color-format-converter-427a91d7/llms.txt): $0.01/call via x402. Converts a color value between hex, RGB, and HSL representations using exact arithmetic.
- [Sindri Alcohol Savings & Opportunity-Cost Calculator](https://www.zero.xyz/c/sindri-alcohol-savings-opportunity-cost-calculator-26c8f566/llms.txt): $0.01/call via x402. Calculates total monthly and yearly alcohol spending (home and out) plus rideshare costs, then projects how that money could grow if invested instead using the future-value-of-an-annuity formula.
- [Chemical Element Lookup](https://www.zero.xyz/c/chemical-element-lookup-2fd3a37b/llms.txt): $0.01/call via x402. Returns the name, atomic mass, and category of a periodic table element given its symbol or atomic number.
- [Sindri Text Diff (Myers Algorithm)](https://www.zero.xyz/c/sindri-text-diff-myers-algorithm-f87e1421/llms.txt): $0.01/call via x402. Computes a line-based diff between two text strings using the Myers diff algorithm, returning a structured list of equal, add, and remove operations.
- [Sindri JWT Decoder](https://www.zero.xyz/c/sindri-jwt-decoder-e0fa7205/llms.txt): $0.01/call via x402. Decodes a JWT by base64url-decoding its header and payload segments without verifying the signature.
- [Sindri Random String Generator](https://www.zero.xyz/c/sindri-random-string-generator-58b52028/llms.txt): $0.01/call via x402. Generates true-random strings in one of 11 formats (alpha, alphanumeric, UUID, ULID, NanoID, hex, binary, octal, numeric, symbol, or sample) with configurable length and locale.
- [Sindri Linear Equation Solver](https://www.zero.xyz/c/sindri-linear-equation-solver-598242eb/llms.txt): $0.01/call via x402. Solves a system of linear equations (Ax = b) using LU decomposition for square coefficient matrices up to 20x20, with near-singularity detection.
- [Sindri Random Geo-Coordinate Generator](https://www.zero.xyz/c/sindri-random-geo-coordinate-generator-0ef26171/llms.txt): $0.01/call via x402. Generates a true-random latitude, longitude, or nearby GPS coordinate bounded by optional min/max or origin+radius parameters
- [Sindri True Random Number Generator](https://www.zero.xyz/c/sindri-true-random-number-generator-41d0b2f6/llms.txt): $0.01/call via x402. Generates a true random number in a specified format (int, float, binary, octal, hex, bigInt, or romanNumeral) within optional bounds
- [Sindri Network-Format Generator](https://www.zero.xyz/c/sindri-network-format-generator-4c0c18d5/llms.txt): $0.01/call via x402. Generates valid IPv4/IPv6 addresses (optionally within a CIDR block or named network range) or well-formed JWT strings on demand
- [Sindri Matrix Operations](https://www.zero.xyz/c/sindri-matrix-operations-e36d01e3/llms.txt): $0.01/call via x402. Performs matrix multiply, transpose, determinant, and inversion on matrices up to 20×20 using LU decomposition with near-singularity protection.
- [HSA Growth Calculator](https://www.zero.xyz/c/hsa-growth-calculator-7621cbf3/llms.txt): $0.01/call via x402. Projects year-by-year HSA (Health Savings Account) balance growth given a starting balance, annual contributions, annual medical expense withdrawals, and an expected annual return rate.
- [Sindri Checksummed Financial Identifier Generator](https://www.zero.xyz/c/sindri-checksummed-financial-identifier-generator-c2a6ebc0/llms.txt): $0.01/call via x402. Generates structurally valid, 

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