Other

Pearson correlation coefficient between two equal-length numeric series.

Descriptive statistics for a list of numbers: count, mean, median, sample stdev/variance, min, max.

Unified line diff between two texts, plus an overall similarity ratio (0-1).

Add a fixed duration (days/hours/minutes/seconds) to an ISO 8601 datetime.

Duration between two ISO 8601 datetimes, as total seconds and a days/hours/minutes/seconds breakdown.

Count weekdays (Mon-Fri) between two dates, inclusive of both endpoints.

ISO 8601 week number, ISO year and ISO weekday (1=Monday) for a date.

EAN-8 or EAN-13 barcode checksum validation (auto-detected by length).

IMEI (15-digit mobile device identifier) Luhn checksum validation.

ISBN-10 or ISBN-13 checksum validation (auto-detected by length).

French SIRET (14-digit business establishment number) Luhn checksum validation. Note: the rare La Poste SIREN exception to the standard rule is not applied.

Ask up to 20 typed yes/no, multiple-choice or ordinal-scale questions about one shared piece of context in a single call - each answered with a real probability (Jev decision primitives), not generated text. Powered by Jev (TypeSafe System One). $0.001 per call, no OpenRouter or TypeSafe account needed. Try GET /decide/sample.

Fasst Text zusammen (Summarize text).

+2 more from Text Tools API

Format an ISO 8601 datetime using a strftime pattern.

Probe any public URL and report if it is an x402 paywall - price, network, payTo, scheme. Shop paywalls before you spend. Try GET /probe/sample.

Find MCP servers matching a need, ranked by semantic similarity over a curated snapshot of MCP servers. Returns name, endpoint, description, source registry and a 0-1 relevance per match. Paid POST: up to 25 matches. Try GET /discover/sample.

Miorail x402 paid resource

Voluntarily support AgentIndex with one cent of Base USDC. Returns payer identity, a thank-you acknowledgement and an x402 settlement receipt. Use this when an agent wants to sponsor open pay-per-call infrastructure.

List Wirecutter review URLs from the public Wirecutter review sitemaps. Defaults to recommendation-like review pages.

+3 more from StableProducts

Internet Archive lookup: whether a snapshot of a URL exists and its closest capture to a given date — read pages that are now dead

+2 more from tokenguard

Agent-SOFR — decentralized USD short-rate benchmark for AI agents. Weighted-median of 7 sources + variance + regime premiums. BNS-calibrated 6-mode classifier on 444k ETH/USDC 5-min bars (λ=1.097 closed-form). Open + IPFS-pinned methodology: agent-sofr-v1.

Public URL status, latency, and response header subset for uptime and health agents

+2 more from vendsdk.com

Look up a product by its UPC/EAN barcode number via Open Food Facts (open data): name, brand, category, quantity, and nutrition grade. Pairs with /api/barcode-decode (image → number → product).

Is this API endpoint healthy? Liveness check, response headers, and TLS certificate status in one pass. API health check skill pack: one x402 payment runs 3 underlying tools (http-check, http-headers, tls-cert); partial-success per step.

Real-time Sahm Rule recession indicator from FRED (SAHMREALTIME series). The Sahm Rule triggers when the 3-month moving average of US unemployment rises ≥0.50 percentage points above its prior-12-month low - historically a clean recession signal. No params.

Real-time USGS earthquake feed: magnitude, place, time, depth, coordinates. Live government data, no key.

Recent FEMA disaster declarations for a US state (openFEMA): title, incident type, declaration type, and date - the federal emergency picture by state, de-duplicated by disaster. Live gov data, no key.

Look up a URL in the Internet Archive's Wayback Machine: returns the archived snapshot closest to an optional timestamp (default: most recent), with the snapshot URL, capture time, and archived HTTP status. Useful for citations, dead-link recovery, and checking what a page said at a point in time. URLs never archived return {available:false}.

Statistical analysis suite: descriptive statistics, correlation analysis, and outlier detection on a single dataset. Number crunch skill pack: one x402 payment runs 3 underlying tools (stats-summary, correlation, outliers); partial-success per step.

Probe any URL and decode its HTTP 402 payment requirements (price, asset, network, pay-to) into clean JSON - what an agent needs to decide whether/how to pay. Read-only; does not pay.