All services

Shape math calculator for area, perimeter, and diagonal length of circles, rectangles, and triangles from plain numeric dimensions — includes Heron's formula for triangles given three sides. Useful for flooring estimates, land-plot sizing, classroom geometry problems, and CAD pre-checks where an exact figure is needed, not an approximation.

Wave physics API: convert between light wavelength (nm), frequency (Hz), and photon energy (joules and eV). Uses exact physical constants.

Percentile and outlier calculator: submit a numeric array and get p25, p50, p75, p90, p99 cutoffs plus IQR-based outlier flags alongside mean, median, and standard deviation. Useful for latency analysis, grading curves, pricing tiers, and any workflow that needs an exact distribution summary.

Draws a random integer within any min-max range using HMAC-SHA256 over a client-supplied seed, revealing the server seed so the draw can be independently recomputed and verified afterward. For raffles, matchmaking, tie-breaking between competing agents, and any process where 'trust me, it was random' isn't good enough.

Text embeddings API without an API key: up to 64 texts per call, 768-dimension embedding vectors computed on our own hardware. For semantic search, clustering, dedup, and RAG. Pay per call with USDC over x402; inputs never stored.

Descriptive statistics API: feed up to 100,000 numbers and get count, sum, mean, median, mode, sample standard deviation, variance, min/max/range, percentiles (p25/p50/p75/p90/p99), and IQR-flagged outliers. Deterministic and auditable — cheaper than burning reasoning tokens, zero arithmetic-hallucination risk, and the result can be cited. For data QA, monitoring, and analysis agents.

Chemical element API: atomic number, atomic mass, electron shells, electronegativity, and physical properties for any element. Local dataset, instant.

Sun & moon API: sunrise, sunset, solar noon, evening golden hour, moon phase name, and moon illumination fraction for any latitude/longitude and date — computed locally, instant, no upstream. For photography scheduling, agriculture, solar estimation, astronomy content, and outdoor-event agents.

HTTP check API: probe any URL and get its status code, response time in milliseconds, server header, content type, and cache policy — an instant is-it-up heartbeat. For uptime monitors, dependency health checks, and pre-crawl validation. SSRF-guarded; scheduled agents welcome.

Periodic table reference returning full physical and chemical data — atomic mass, category, period, group, electron shells, melting and boiling points — for any element by name, symbol, or atomic number. Useful for science education tools, materials databases, and chemistry-adjacent content generation.

Vector embeddings API: converts up to 64 pieces of text per call into 768-dimensional numeric vectors suitable for similarity comparison, no separate provider account or key needed. Pay per call in USDC, and nothing submitted is retained afterward. Use it to build semantic search indexes, cluster related documents, or de-duplicate near-identical text at scale.

List every legal chess move for a position given as FEN, in both SAN (Nf3) and UCI (g1f3) notation, plus turn and check/checkmate/stalemate/draw flags. Pass 'start' for the opening position. For bots playing chess, validating opponents, or teaching the rules.

Returns sunrise, sunset, solar noon, and evening golden-hour timing for any latitude/longitude and date, computed directly with no external lookup delay. Useful for photography scheduling, solar panel estimation, and outdoor-event agents that need precise light timing rather than a rough sunrise/sunset guess.

On-this-day API: notable historical events for any month/day — year, one-line description, and related article links. Fresh daily content for newsletters, social bots, and trivia agents.

Mortgage and loan payment calculator: enter principal, annual rate, and term to get the exact monthly payment, total amount paid over the life of the loan, and total interest owed. Built for home-buying estimates, amortization sanity checks, and personal-finance planning agents that need real numbers instead of a rough guess. Not financial advice — just exact arithmetic on the inputs you give it.

Returns rhyming words, sound-alikes, or commonly paired adjectives for any input word, ranked by strength of association. Useful for crossword and word-game agents, poetry generation, and naming brainstorms that need a wider candidate list than a model would produce unprompted.

Finds words related to any input word, similar meanings, words that sound alike, or adjectives commonly paired with it, ranked by association strength, up to 20 results per call. For copywriters, product namers, and word-game agents looking for options beyond an LLM's usual first guesses.

Financial calculator API: compound interest (final amount, interest earned, effective annual rate), loan/mortgage payment (monthly payment, total paid, total interest), or ROI — from structured numeric inputs. For fintech, budgeting, and planning agents. Not financial advice; the arithmetic is exact.

Today's featured space image — title, high-resolution image URL, and a full written explanation from an astronomer — refreshed daily. A drop-in content source for newsletters, screensaver bots, and daily-content agents that want a fresh astronomy image with context every day, no image curation required.

Aggregated 24h whale digest for Polymarket (15 min delay): top-10 markets by whale volume with YES/NO net flow, top-10 largest single bets, and totals (whale trade count, volume, unique wallets). One call = full daily picture.

OpenAI-compatible chat completions over x402 - point any OpenAI SDK at base_url https://agent402.tools/v1 and pay per call in USDC (Base, Solana, Polygon, Arbitrum, Stellar), no API key, no signup. Budget/mid models: gpt-4o-mini, claude haiku, gemini flash, deepseek, llama, mistral, qwen. Full wire compatibility incl. tools/function-calling and response_format. GET /v1/models lists every model. Streaming supported (stream: true).

HivemindOS service router for agents: one paid call returns the full HivemindOS commercial catalog (crypto research, wallet risk, Reddit customer research, media, models, email) with live pricing plus every direct x402 purchase endpoint and exact request examples. Start here to discover what a HivemindOS agent stack can buy.

Tornado alert API: every tornado warning and tornado watch currently active anywhere in the United States — affected zones, severity, urgency, and full alert text — as normalized JSON. Use for safety-notification agents, logistics-halt automation, and severe-weather news agents. Public-domain government data, refreshed every 2 minutes. An empty feature list means no tornado activity is in progress, not an upstream failure.

Nationwide tornado warning and watch feed: every currently active US tornado warning or tornado watch — affected zones, severity, urgency, and full alert text — as normalized JSON, refreshed every 2 minutes. Built for safety-notification and logistics-halt agents that need the fastest possible signal on tornado activity.