Every agent-payable API.

URL encode and decode - percent-encode text for query strings and paths, or decode a percent-encoded string

Weight converter - convert between pounds, kilograms, ounces, grams, stone and tons with all equivalents

Base64 encode and decode text - returns standard and URL-safe base64, or the decoded text with UTF-8 detection

JSON formatter and beautifier - pretty-print or minify JSON with chosen indent and optional key sorting

Text diff - line-by-line differences between two texts with added, removed and unchanged counts and similarity

Bitcoin address validator - checks base58check and bech32/bech32m checksums, returns network, address type (P2PKH, P2SH, P2WPKH, taproot) and encoding

Speed converter - convert between mph, km/h, m/s, knots and ft/s with all equivalents

Unix timestamp converter - unix seconds or milliseconds to ISO 8601 date, weekday and day of year, or a date to unix time

Cron expression explained in plain English with the next run times in any time zone - validates a 5-field cron and handles DST

Savings goal calculator - months to reach a target from monthly savings, current balance and interest rate

Age calculator from birthdate - exact age in years, months and days, total days lived and days until the next birthday

UN Sustainable Development Goal indicators for a country - latest values and trends

Dew point, wet-bulb, absolute humidity and condensation check

Dictionary: Definitions, Examples, Pronunciation. English dictionary: definitions by part of speech with usage examples (Wiktionary), pronunciation, syllable count and word frequency; spelling suggestions when a word is not found.

Thesaurus: Synonyms, Antonyms, Rhymes & More. Thesaurus and word finder: synonyms, antonyms, rhymes, near rhymes, sound-alikes, homophones, means-like, adjectives for a noun, broader/narrower terms, with parts of speech and frequency (Datamuse).

EU public procurement tender search (TED) - title, buyer, CPV codes, publication date and deadline

Electric vehicle range estimate from battery capacity, consumption and reserve - kilometers and miles

Geocode a street address or landmark to latitude and longitude - up to five ranked results with country, region and type (OpenStreetMap)

Radon potential for a U.S. address or coordinates (USGS and EPA) - low, moderate or high with screening range

Snowpack near a western U.S. or Alaska location (SNOTEL) - snow water equivalent, depth and percent of median

Superfund sites near an address or coordinates (EPA NPL) - status, distance, hazard score and cleanup dates

FDA food recall search (openFDA) - product, reason, firm, classification and status

FDA medical device recall search (openFDA) - product, reason, firm, classification and status

FDA drug recall search (openFDA) - product, reason, firm, classification and status

Film Facts: director, cast, release, runtime, box office (Wikidata). Film facts from Wikidata: release date, runtime, directors, writers, cast, genres, countries, language, composer, producers, studios, box office, budget, IMDb and Wikipedia links; disambiguate with year.

Final exam score-needed calculator from current score, target and exam weight

Solunar fishing and hunting forecast - moon phase, illumination and major and minor activity windows

Packaged food lookup by UPC or EAN barcode - name, brand, ingredients, allergens, Nutri-Score and nutrition facts

Fossil taxon lookup (Paleobiology Database) - classification, occurrences and geological age range

Freight class hint from weight and dimensions - volume, density and NMFC density class

Fundraising dilution calculator - post-money valuation and investor and holder ownership after the round

Fundraising dilution calculator - post-money valuation and investor and holder ownership after the round

GPA calculator from grade-point and credit-hour arrays - quality points, credits and GPA

GS1 SSCC-18 logistics-unit validator - check digit, payload and serial reference

Planting window dates from local frost dates and crop maturity - indoor start, transplant and harvest

Weekly EIA retail fuel prices - regular and premium gasoline and diesel, national or by area

Genealogy lookup for a notable person - birth and death, parents, spouses, children and siblings (Wikidata)

Grammar & Spelling Check (30+ languages). Grammar, spelling and style check in 30+ languages (auto-detected): each issue with message, category, position and suggested replacements, plus a corrected version of the text. Powered by LanguageTool.

Grant fit score - eligible-cost ceiling, required cash match, match gap and request-to-budget risk

Great-circle midpoint between two coordinates - latitude and longitude

Great-circle (Haversine) distance between two coordinates in kilometers and miles

Reviving a Western Digital Hard Drive on Linux. A Linux recovery workflow for a failing 2.5-inch WD drive: reading SMART health with smartctl (watching reallocated/pending sectors), zero-filling with dd to force sector reallocation, repairing with fsck, repartitioning in GParted, and last-resort sector imaging with ddrescue/HDDSuperClone.

Object Storage Integrity and Recovery. An object inventory and policy that proves ownership, encryption, upload validation, integrity, access isolation, version/delete recovery, lifecycle, and application behavior after regional or credential failure.

CUDA, Driver and Ollama Compatibility Guide. A versioned local-AI compatibility plan showing GPU support, driver/runtime path, Ollama execution backend, model memory fit, context/concurrency limits, and a measured proof that inference uses the intended hardware.

Whale Signal Validation. A wallet-signal record that preserves chain event evidence, qualifies identity and control claims, classifies transfer versus trade versus contract action, normalizes size against liquidity and wallet history, and backtests whether the signal has after-cost predictive value.

x402 Paid Endpoint Builder. A build method for x402-payable endpoints: defining the paid unit and free preview, choosing scheme/network/asset/price, implementing the unpaid 402 challenge, verifying and settling before irreversible fulfillment, making retries idempotency-safe, publishing discovery metadata, and passing a full negative-test gate before mainnet. Includes a worked margin-negative pricing example.

Reliable Browser Automation. A browser workflow that can resume safely, distinguishes navigation from application failure, avoids duplicate submissions, proves the final page state, and stops when identity, anti-bot, consent, or site-policy requirements are unresolved.

Prompt-Injection Defense Guide. A procedure for designing agent workflows that resist prompt injection: mapping which tools/credentials/side effects an untrusted content source can reach, minimizing and labeling retrieved content by trust/provenance, externalizing policy and authorization into deterministic code rather than the model, using a propose-review-execute pattern for high-impact actions, constraining what untrusted content can write to memory, and running adversarial evaluation…

DNS, TLS and Deployment Triage. A hop-by-hop diagnostic for domain/hosting failures: authoritative vs recursive DNS, TLS/SNI verification with openssl and curl --resolve, distinguishing 502 (proxy reached, upstream failed) from 504 (timeout), and a worked apex-certificate-warning example.

Vendor and API Dependency Risk. A dependency register and control plan that classifies criticality, verifies authority and data flow, measures reliability/cost/change behavior, tests failure and exit, and prevents one vendor from silently controlling the product.