# Services from api.24klabs.ai on Zero

> api.24klabs.ai serves 286 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/api.24klabs.ai
Live health (JSON, refreshed every minute): https://www.zero.xyz/host/api.24klabs.ai/health.json

## Services

- [Black-Scholes Options Pricer](https://www.zero.xyz/c/black-scholes-options-pricer-949a3559/llms.txt): $0.005/call via x402. Prices European call/put options (fair value + Greeks) using Black-Scholes, with optional implied volatility solve from a market price.
- [Cron Expression Parser](https://www.zero.xyz/c/cron-expression-parser-b0ad4394/llms.txt): $0.002/call via x402. Parses a 5/6-field cron expression or @macro into a plain-English summary, per-field breakdown, and the next N scheduled run times from a given base time and UTC offset.
- [24K Labs IP CIDR Calculator](https://www.zero.xyz/c/24k-labs-ip-cidr-calculator-3f7c71a7/llms.txt): $0.002/call via x402. Performs CIDR math for IPv4/IPv6 addresses: computes network, broadcast, netmask, wildcard, prefix, usable host range and count, supports mask-to-prefix conversion, optional contains check, and subnet splitting.
- [IBAN / ABA Routing / SWIFT BIC / Card Luhn Validator](https://www.zero.xyz/c/iban-aba-routing-swift-bic-card-luhn-validator-d38cfac3/llms.txt): $0.002/call via x402. Validates and decodes financial identifiers: IBAN checksum and country/BBAN, US ABA routing numbers, SWIFT/BIC format, and credit/debit card numbers via Luhn check with network detection.
- [24K Labs Crypto Address Validator](https://www.zero.xyz/c/24k-labs-crypto-address-validator-8a90e4b2/llms.txt): $0.003/call via x402. Validates a cryptocurrency address for correctness, checksum validity, and chain type (e.g. EVM)
- [24K Labs AI Security Audit](https://www.zero.xyz/c/24k-labs-ai-security-audit-a850af51/llms.txt): $1/call via x402. Performs an AI-powered security audit of code, identifying vulnerabilities with CVSS scores and detailed findings, paid per-request with USDC on Base L2.
- [24K Labs Image Rotate & Flip](https://www.zero.xyz/c/24k-labs-image-rotate-flip-34b61ab4/llms.txt): $0.003/call via x402. Rotate and/or flip an image, returning the transformed result as a base64-encoded PNG/JPEG/WEBP/etc.
- [24K Labs Text-to-SQL](https://www.zero.xyz/c/24k-labs-text-to-sql-35d59bd6/llms.txt): $0.02/call via x402. Converts a natural language question into a SQL query using AI
- [24K Labs Geocode — Address to Coordinates](https://www.zero.xyz/c/24k-labs-geocode-address-to-coordinates-ac0b6a5f/llms.txt): $0.003/call via x402. Converts a text address or place name into geographic coordinates (latitude and longitude)
- [24K Labs Cron Expression Parser](https://www.zero.xyz/c/24k-labs-cron-expression-parser-6244fd48/llms.txt): $0.002/call via x402. Parses a cron expression and returns the next scheduled run times along with a human-readable description of the schedule.
- [APR to APY Converter](https://www.zero.xyz/c/apr-to-apy-converter-98cbca5a/llms.txt): $0.002/call via x402. Converts an Annual Percentage Rate (APR) to Annual Percentage Yield (APY) and computes projected future value given a principal amount.
- [24K Labs PDF Form Fill](https://www.zero.xyz/c/24k-labs-pdf-form-fill-d5e2d7e6/llms.txt): $0.006/call via x402. Fills a PDF form with provided field values and returns the completed PDF as a base64-encoded string along with a list of filled field names.
- [24K Labs Air Quality API](https://www.zero.xyz/c/24k-labs-air-quality-api-c637a738/llms.txt): $0.003/call via x402. Returns current AQI, PM2.5, PM10, and ozone levels for any US or European latitude/longitude coordinate via Open-Meteo air quality data.
- [APR/APY Converter & Yield Projector](https://www.zero.xyz/c/apr-apy-converter-yield-projector-6e6cc52d/llms.txt): $0.002/call via x402. Converts between APR (nominal) and APY (effective) for any compounding frequency, and optionally projects yield on a principal over a time horizon.
- [24KLabs Base64/Hex/URL Codec](https://www.zero.xyz/c/24klabs-base64-hex-url-codec-8dd4ef53/llms.txt): $0.001/call via x402. Encode or decode strings across base64, base64url, hex, and URL/percent-encoding formats.
- [Black-Scholes Options Pricer](https://www.zero.xyz/c/black-scholes-options-pricer-86e7ae66/llms.txt): $0.005/call via x402. Computes European call/put fair value and Greeks (delta, gamma, theta, vega, rho) from spot, strike, days-to-expiry, rate, and volatility; optionally solves for implied volatility given a market price.
- [Bond Price & Yield Calculator (24K Labs)](https://www.zero.xyz/c/bond-price-yield-calculator-24k-labs-d2091d4f/llms.txt): $0.004/call via x402. Calculates bond price or yield-to-maturity, current yield, Macaulay duration, modified duration, and convexity from coupon rate, face value, maturity, and coupon frequency.
- [Bond Price, Yield & Duration Calculator](https://www.zero.xyz/c/bond-price-yield-duration-calculator-3e139286/llms.txt): $0.004/call via x402. Computes clean bond price, yield-to-maturity, current yield, Macaulay duration, modified duration, and convexity from coupon rate, face value, maturity date, and coupon frequency.
- [Business Days Calculator](https://www.zero.xyz/c/business-days-calculator-b3734509/llms.txt): $0.002/call via x402. Add or subtract business days to/from a date, or count working days between two dates, with weekend and custom holiday awareness.
- [24K Labs Business Days Calculator](https://www.zero.xyz/c/24k-labs-business-days-calculator-7665a3e7/llms.txt): $0.002/call via x402. Add or subtract business days to/from a date, or count working days between two dates, with weekend and custom holiday awareness.
- [24K Labs Return & Risk Metrics Calculator](https://www.zero.xyz/c/24k-labs-return-risk-metrics-calculator-ae5f0c2d/llms.txt): $0.003/call via x402. Computes CAGR, total return, annualized volatility, Sharpe ratio, and maximum drawdown from a value series or start/end/years inputs
- [24K Labs Return & Risk Metrics Calculator](https://www.zero.xyz/c/24k-labs-return-risk-metrics-calculator-bc3fa2f5/llms.txt): $0.003/call via x402. Computes CAGR, total return, annualized volatility, Sharpe ratio, and maximum drawdown from a value series or start/end/years inputs.
- [24K Labs Case Converter API](https://www.zero.xyz/c/24k-labs-case-converter-api-9ad94c4c/llms.txt): $0.001/call via x402. Converts text strings between multiple case formats including upper, lower, title, sentence, snake_case, camelCase, kebab-case, and CONSTANT_CASE.
- [24K Labs Color Converter](https://www.zero.xyz/c/24k-labs-color-converter-53727e55/llms.txt): $0.002/call via x402. Converts a color between hex, RGB, HSL, HSV, and CMYK formats, and optionally computes the WCAG 2.1 contrast ratio and AA/AAA accessibility compliance against a second color.
- [24K Labs Color Converter with WCAG Contrast](https://www.zero.xyz/c/24k-labs-color-converter-with-wcag-contrast-662a78f7/llms.txt): $0.002/call via x402. Converts a color between hex, RGB, HSL, HSV, and CMYK formats, and optionally computes the WCAG 2.1 contrast ratio and AA/AAA accessibility pass/fail against a second color.
- [Git Diff to Conventional Commit Message Generator](https://www.zero.xyz/c/git-diff-to-conventional-commit-message-generator-c15eef66/llms.txt): $0.008/call via x402. Converts a git diff into a structured Conventional Commits message with type, scope, subject, and body.
- [Compound Interest Projection API](https://www.zero.xyz/c/compound-interest-projection-api-3e7fa996/llms.txt): $0.002/call via x402. Projects the future value of a lump-sum investment plus recurring contributions over time, returning a balance growth curve, total contributed, and total interest earned.
- [Compound Interest Projection API](https://www.zero.xyz/c/compound-interest-projection-api-6c4ed3ee/llms.txt): $0.002/call via x402. Calculates the future value of a lump sum investment plus recurring contributions over time, returning a balance growth curve, total contributed, and total interest earned.
- [24K Labs Cron From Text](https://www.zero.xyz/c/24k-labs-cron-from-text-b1fb7571/llms.txt): $0.006/call via x402. Converts a plain-English schedule description into a valid cron expression.
- [24K Labs Crypto Address Validator](https://www.zero.xyz/c/24k-labs-crypto-address-validator-c59ec45b/llms.txt): $0.003/call via x402. Validates and checksums EVM (EIP-55), Bitcoin (base58check and bech32), and Solana addresses, detecting chain type and flagging checksum errors before a transfer.
- [CSV Deduplication API](https://www.zero.xyz/c/csv-deduplication-api-845f1ef4/llms.txt): $0.003/call via x402. Removes duplicate rows from CSV text by all columns or a specified subset of key columns, returning cleaned CSV and a removal report.
- [CSV Deduplication API](https://www.zero.xyz/c/csv-deduplication-api-0c059318/llms.txt): $0.003/call via x402. Removes duplicate rows from CSV text by all columns or a specified subset of key columns, returning cleaned CSV and a removal report.
- [24K Labs CSV Profile](https://www.zero.xyz/c/24k-labs-csv-profile-e5add4b8/llms.txt): $0.005/call via x402. Computes column-level statistics for a CSV file including inferred type, null count, distinct count, min/max/mean for numeric columns, and sample values.
- [24K Labs CSV Profile](https://www.zero.xyz/c/24k-labs-csv-profile-4ec6b9d7/llms.txt): $0.005/call via x402. Profiles a CSV file and returns column-level statistics including inferred type, count, null count, distinct count, min/max/mean for numeric columns, and sample values.
- [24K Labs Current Weather by Lat/Lon](https://www.zero.xyz/c/24k-labs-current-weather-by-lat-lon-47e3e3ca/llms.txt): $0.003/call via x402. Returns current temperature, wind speed, humidity, and weather conditions for any geographic coordinate pair, powered by Open-Meteo (no API key required).
- [24K Labs Data Format Validator & Linter](https://www.zero.xyz/c/24k-labs-data-format-validator-linter-2ccc6fb1/llms.txt): $0.002/call via x402. Validates and lints JSON, YAML, CSV, or XML input, returning a validity flag, error location (line/column), and a normalized re-serialized copy when valid.
- [24KLabs Data Format Validator & Linter](https://www.zero.xyz/c/24klabs-data-format-validator-linter-f0b8fffd/llms.txt): $0.002/call via x402. Validates and lints JSON, YAML, CSV, or XML input, returning a valid flag, the first error location (line/column), and a normalized re-serialized copy when valid.
- [24K Labs Date Difference Calculator](https://www.zero.xyz/c/24k-labs-date-difference-calculator-0d458292/llms.txt): $0.001/call via x402. Computes the difference between two dates/times in days, hours, minutes, and business days.
- [24K Labs Datetime Toolkit](https://www.zero.xyz/c/24k-labs-datetime-toolkit-d7f9f000/llms.txt): $0.002/call via x402. Performs date/time arithmetic, diff, epoch-to-ISO conversion, and strftime reformatting in a single API call.
- [24K Labs Datetime Toolkit](https://www.zero.xyz/c/24k-labs-datetime-toolkit-6ae82d04/llms.txt): $0.002/call via x402. Performs date/time arithmetic: diff two datetimes, add/subtract intervals, convert between epoch and ISO-8601, and reformat via strftime patterns.
- [Debt Payoff Planner (Snowball/Avalanche Simulator)](https://www.zero.xyz/c/debt-payoff-planner-snowball-avalanche-simulator-6b8e2043/llms.txt): $0.003/call via x402. Simulates month-by-month debt payoff using snowball (smallest balance first) or avalanche (highest APR first) strategies, returning months-to-debt-free, total interest paid, and interest saved versus paying minimums.
- [24K Labs Debt Payoff Planner](https://www.zero.xyz/c/24k-labs-debt-payoff-planner-9dc368d6/llms.txt): $0.003/call via x402. Simulates month-by-month debt payoff using snowball or avalanche strategy, returning months to debt-free, total interest paid, and interest saved versus paying minimums.
- [24K Labs Stats Toolkit](https://www.zero.xyz/c/24k-labs-stats-toolkit-bc05c263/llms.txt): $0.003/call via x402. Computes descriptive statistics (mean, median, mode, stddev, variance, quartiles, percentiles, z-scores, IQR), detects outliers, and optionally runs Pearson correlation and linear regression against a second data series.
- [24K Labs Stats Toolkit](https://www.zero.xyz/c/24k-labs-stats-toolkit-7fb9cd42/llms.txt): $0.003/call via x402. Computes descriptive statistics (mean/median/mode, stddev/variance, quartiles/percentiles, z-scores, IQR), flags outliers, and optionally computes Pearson correlation and linear regression against a second data series.
- [24K Labs DNS Lookup](https://www.zero.xyz/c/24k-labs-dns-lookup-0f255a7f/llms.txt): $0.002/call via x402. Resolves A, AAAA, MX, TXT, NS, and CNAME DNS records for a domain using DNS-over-HTTPS via Google.
- [24K Labs Image Dominant Color Extractor](https://www.zero.xyz/c/24k-labs-image-dominant-color-extractor-5384d964/llms.txt): $0.004/call via x402. Extracts the dominant color palette from an image, returning hex color codes with their coverage percentages.
- [24K Labs Image Dominant Color Extractor](https://www.zero.xyz/c/24k-labs-image-dominant-color-extractor-a17287aa/llms.txt): $0.004/call via x402. Extracts the dominant color palette from an image and returns hex color codes with their coverage percentages.
- [24K Labs Email Validator](https://www.zero.xyz/c/24k-labs-email-validator-74451aed/llms.txt): $0.002/call via x402. Validates an email address for RFC-5322 syntax correctness and flags it as disposable, role-account, or from a free email provider.
- [24K Labs Base Encoding/Decoding API](https://www.zero.xyz/c/24k-labs-base-encoding-decoding-api-29b7982f/llms.txt): $0.001/call via x402. Encodes or decodes a string using base64, base64url, base32, hex, URL/percent-encoding, HTML entities, or data-URIs in a single API call.
- [api.24klabs.ai Base Encode/Decode](https://www.zero.xyz/c/api-24klabs-ai-base-encode-decode-75746b1c/llms.txt): $0.001/call via x402. Encodes or decodes a string using base64, base64url, base32, hex, URL/percent-encoding, HTML entities, or data-URIs in a single API call.
- [Ethereum Unit Converter (24K Labs)](https://www.zero.xyz/c/ethereum-unit-converter-24k-labs-23a6aebd/llms.txt): $0.002/call via x402. Converts amounts between Ethereum denominations (wei, kwei, mwei, gwei, szabo, finney, ether) using exact integer/decimal arithmetic with no floating-point errors.
- [Ethereum Unit Converter (24K Labs)](https://www.zero.xyz/c/ethereum-unit-converter-24k-labs-daed5159/llms.txt): $0.002/call via x402. Converts amounts between Ethereum denominations (wei, kwei, mwei, gwei, szabo, finney, ether) using exact integer/decimal arithmetic with no floating-point errors.
- [ETH Unit Converter with USD Valuation](https://www.zero.xyz/c/eth-unit-converter-with-usd-valuation-ca10343b/llms.txt): $0.001/call via x402. Converts between wei, gwei, and ether (or arbitrary-decimal ERC20 token amounts) with big-integer precision, and optionally computes USD value from a caller-supplied price.
- [ETH Unit Converter (wei / gwei / ether / ERC20)](https://www.zero.xyz/c/eth-unit-converter-wei-gwei-ether-erc20-7f21141c/llms.txt): $0.001/call via x402. Converts Ethereum denominations (wei, gwei, ether) or arbitrary-decimal ERC20 token amounts with big-integer precision, and optionally computes USD value from a caller-supplied price.
- [Ethereum Calldata Decoder & Keccak256 Selector](https://www.zero.xyz/c/ethereum-calldata-decoder-keccak256-selector-ba9d009a/llms.txt): $0.002/call via x402. Computes 

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