Safely evaluate an arithmetic expression (+ - * / % ^ and parentheses). No code execution - a real parser, not eval.

Decompress a base64-encoded Brotli payload. Returns the result as utf8 (text) or base64 (binary). Refuses to expand past 10MB to defend against zip bombs.

Convert text between camelCase, PascalCase, snake_case, kebab-case, CONSTANT_CASE, Title Case, lowercase and UPPERCASE.

Validate a payment card number (Luhn checksum) and detect the brand. Numbers are not stored or logged.

Run the same input through gzip, brotli, and raw deflate at max settings and report each one's output size and ratio. Use this to decide which algorithm to actually use - the answer depends on your content (binary often resists compression entirely; English prose squeezes well with brotli; JSON sits in between).

Pearson correlation coefficient between two equal-length numeric series. Returns r (the correlation, -1 to 1), r² (variance explained), n (sample size). Use this to ask things like: is a stock's daily return correlated with a macro indicator? Are two FRED series moving together?

CRC-32 checksum of a text string (hex), the IEEE polynomial used by zip/png/gzip.

Get the day number within the year (1-366) for any date, plus days remaining, leap-year status, percent of year complete, and a simple (Sunday-start) week number.

Remove duplicate lines, preserving first-seen order. Returns the deduped text and how many were removed.

L2 order-book snapshot for a spot pair: best bid/ask, mid price, spread (absolute + %), and the top N aggregated price levels per side (default 25, max 100). Pairs use BASE-QUOTE format (BTC-USD, ETH-USD, SOL-USDC). Read from a U.S. spot exchange's public market-data API - keyless; coverage is that exchange's listed markets.

Validate CSV structure: consistent column counts across rows, properly closed quotes, delimiter detection. Returns row/column counts and any structural errors. Pure CPU.

Difference between two dates/times in ms, seconds, minutes, hours, days, and a human summary.

Parse a 5-field cron expression and return the next N run times (UTC).

Resolve an ENS name (e.g. vitalik.eth) to its Ethereum address - so an agent can turn a human-readable recipient into a payable address. Read-only on Ethereum mainnet.

Compute the date of Easter Sunday for a given year using the Anonymous Gregorian algorithm (Meeus/Jones/Butcher). Also returns Good Friday, Ash Wednesday, Palm Sunday, Pentecost, and the day-of-year for Easter.

Look up the Uniswap V3 pool address for a token pair + fee tier on Ethereum, Base, Polygon, Arbitrum, or Optimism. Pass either order (tokenA/tokenB) - the factory sorts internally. Returns 0x0…0 if no pool has been deployed for that combination yet.

Look up the current Total Value Locked (TVL) for a DeFi protocol from an open DeFi analytics API. Identify the protocol by its slug (uniswap, aave, lido, ethena, etc.). Returns the total TVL plus per-chain breakdown and 24h/7d/30d change where the source exposes it.

Parse a duration like "2h30m" / "1d4h" / "90s" to seconds, or humanize a number of seconds.

Financial math. op: "compound" (future value of principal at a rate) or "loan" (monthly payment + total for a loan).

Backtest a forecasting method on the input series by holding out the last `testSize` observations, forecasting them, and computing MAPE (mean absolute percentage error) + RMSE (root mean squared error). Lets an agent pick which method (mean / naive / drift / ses / holt / holt-winters) actually fits its data before committing to a forward forecast.