25 services carry this tag in their source record. Tags come from the provider, not from us — a tag is a claim about what the service does, not proof that it does it well.
ANTHROPIC-COMPATIBLE /v1/messages — Claude Haiku 4.5 through the exact Anthropic API dialect: same request/response shape, no Anthropic account, the x402 payment IS the auth. Point an Anthropic SDK's base_url at https://...
Evaluate whether a mathematical research branch should continue, revise, abstain, or escalate.
Cron expression explained in plain English with the next run times in any time zone - validates a 5-field cron and handles DST
Convert between units of length, mass, volume (incl. US cups and gallons), temperature (c, f, k), speed, area, data size (kB vs KiB), time, energy and pressure. Example units: km, mi, lb, kg, floz, ml, mph, kn, acre, gib...
Math expression calculator. Evaluate an arithmetic expression safely (parsed, never executed as code): + - * / % ^ and **, parentheses, factorial !, constants pi, e and tau, and functions sqrt, cbrt, abs, round, floor, c...
Statistics of numbers. Descriptive statistics for a list of numbers: count, sum, mean, median, mode, min, max, range, population and sample variance and standard deviation, quartiles with IQR, and the 90th, 95th and 99th...
Convert integers of any size (signed) between bases 2 to 36: binary, octal, decimal, hex, base32, base36, with bit and byte length and two's complement. Accepts 0x/0b/0o prefixes.
Exact symbolic computation (SymPy): simplify, differentiate, integrate, solve equations/systems, limits, series, Laplace/Fourier transforms, arbitrary-precision eval. Expressions are JSON ASTs; every result is numericall...
Numerical computing (SciPy): root-finding, optimization, numerical integration (quadrature), eigenvalues/vectors, and linear solves — returned with residuals and condition numbers. Paid in USDC on Base or Solana.
Greatest common divisor and least common multiple of two or more integers, computed exactly (arbitrary precision). Useful for cycle alignment, scheduling periods and fraction work. Signs are ignored; a zero makes the LCM...
Great-circle distance between two latitude/longitude points using the haversine formula. Returns kilometers and miles. Deterministic.
Percentage helper. op: "of" (a% of b), "change" (% change a→b), "ratio" (a is what % of b).
Safely evaluate an arithmetic expression (+ - * / % ^ and parentheses). No code execution - a real parser, not eval.
Parse an IPv4 CIDR block: network address, broadcast, first/last host, netmask, and host count. Optionally test if an IP is inside it.
Financial math. op: "compound" (future value of principal at a rate) or "loan" (monthly payment + total for a loan).
Format a number: thousands separators, fixed decimals, optional currency, or compact (1.2K / 3.4M).
Descriptive statistics for an array of numbers: count, sum, mean, median, mode, min, max, range, variance, stddev, and percentiles.
Convert a value between units of length, mass, temperature, volume, area, speed, time, data, pressure, energy, power, angle, frequency - every unit the retired convert-* endpoints handled (e.g. miles, kilometers, kilogra...
Clamp a number between min and max for $0.002 USDC for $0.002 USDC. Call when you need this bounded result without an API key or subscription. Returns machine-readable JSON via x402 on Base or Solana. Limitation: results...
Breached password check: is this password in known data breaches, and how often? Send only the SHA-1 hash (never the password); just the first 5 characters reach Have I Been Pwned (k-anonymity). Up to 50 hashes per call.
The current time, or a given time, in one or more IANA time zones, with UTC offset, abbreviation, whether daylight saving time is in effect, and the weekday. Give a local time with from_tz to convert it, handling DST cor...
Simplify a fraction to lowest terms and return its decimal value.
Offline validator for a Romanian CUI (company tax ID). Strips an optional 'RO' prefix, applies weights 7-5-3-2-1-7-3-2 to the digits preceding the check digit (right-to-left), sums the weighted products, multiplies by 10...
Compute absolute and percent change for $0.001 USDC. Call when you need this bounded result without an API key or subscription. Returns machine-readable JSON via x402 on Base or Solana. Limitation: results cover only the...