Every agent-payable API.

Accessibility audit of a web page - missing alt text, unlabeled forms, link names, headings and a score

HTTP security header audit for any URL - HSTS, CSP, clickjacking, referrer policy, cookies and a letter grade

BMI calculator from weight, height and age - exact and rounded BMI

BMR and daily calorie estimate (Mifflin-St Jeor) from weight, height, age and activity

Bitcoin address balance and transaction history - confirmed and pending balance, totals and recent transactions

Bitcoin network status - block height and fee estimates in sat/vB from next block to 1 day

Bitcoin transaction details - confirmations, block, fee and fee rate, inputs and outputs

Book Search (Open Library, 40M+ editions). Book search across 40M+ editions (Open Library) by keywords, author or subject: authors, first published year, edition count, pages, ISBNs, subjects, ratings, e-book availability and cover image.

ISBN Lookup: title, authors, publisher, description, cover. ISBN lookup (checksum-validated ISBN-10/13): title, authors, publisher, publish date, pages, languages, subjects, description, first published and cover image.

Brazilian company registry (CNPJ) lookup - legal name, status, activity, address and partners

Brazilian postal code (CEP) to address - state, city, neighborhood and street

Brazilian bank list - ISPB, Banco Central code and legal name for every institution

Brazilian phone area code (DDD) to state and covered cities

Brazilian vehicle reference price (Fipe table) by brand, model and year - price in BRL by fuel type

Brazilian national holidays for a year - date, name and weekday

Break-even calculator - contribution margin, break-even units and revenue, and target-profit units

CSS rem to pixels converter from root font size and rem value

Card BIN lookup - network, type (debit, credit, prepaid), brand, issuing bank and country from the first 6-8 digits

Cemetery and burial-site reference - identity, coordinates, inception and official links (Wikidata)

Chemical Compound Lookup (PubChem): properties, hazards, identifiers. Chemical compound lookup in PubChem by name, CAS number, CID, SMILES or InChIKey: formula, molecular weight, IUPAC name, identifiers, computed properties (XLogP, TPSA, H-bond donors/acceptors), GHS hazard signal, pictograms and H-statements, synonyms, description and structure image.

Chess Position Evaluation (Stockfish via Lichess cloud). Chess position evaluation from Stockfish via the Lichess cloud: up to 5 best lines with moves, evaluation in pawns or mate-in-N, depth and a plain-language verdict.

Chess Player Ratings & Stats (Lichess). Lichess chess player profile: title, ratings and game counts per time control, win/loss/draw totals, country, join date and play time.

Lichess daily chess puzzle - FEN position, rating, themes and UCI solution moves

Childcare cost estimate - weekly, monthly, annual and per-child from hours, hourly rate and child count

Childcare staffing ratio calculator - children per adult and adults per child

Childcare subsidy net-cost calculator - net monthly and annual cost after subsidy and tax credit

Class action lawsuit search via CourtListener - case name, court, date and citation

Class action lawsuit search via CourtListener - case name, court, date and citation

Coat-of-arms reference for a country, place, institution or family, with Wikimedia Commons asset

Coin and denomination reference - issuing countries, materials, designers and images (Wikidata)

Color Info: HEX/RGB/HSL/CMYK, nearest name, palette. Color conversions and info for a hex color: RGB, HSL, CMYK, nearest CSS color name, luminance, best text color, and complementary, analogous and triadic palette colors.

Company lookup by website domain, matched to GLEIF legal entities with LEI

Company search by name in the GLEIF LEI registry - LEI, status, jurisdiction, legal form and headquarters

Full company record by LEI code - status, addresses, former names and direct and ultimate parent

CAGR calculator from start value, end value and years - growth multiple and annual rate

Concrete volume estimate for a rectangular pour with waste allowance - cubic meters and liters

Concrete volume estimate for a rectangular pour with waste allowance - cubic meters and liters

U.S. State Department travel advisory for a country - level 1-4, label, full text and last update

Credit utilization calculator - overall and per-card utilization plus paydown needed for a target percent

List subdomains of a domain from Certificate Transparency logs - first and last seen dates, certificate counts and issuer, plus wildcard certificate count

Decode 4, 5 and 6 band resistor colors into ohms, tolerance range and temperature coefficient, or encode an ohm value into the nearest E24 color bands

Read one 32-byte contract storage slot on 16 EVM chains, returned as hex, integer and address form, for example proxy implementation slots.

Go module info - latest version, publish time, source repository, tagged version count and go get command from proxy.golang.org

XRP Ledger account lookup: balance, reserve and spendable XRP, trust line balances, required destination tag and deposit authorization flags.

Search Europe PMC biomedical literature - title, authors, journal, year, citation count, open access flag, PMID, PMCID, DOI, MeSH terms and abstract

Uniswap V3-style pool state for 16 EVM chains: spot price from slot0, current tick, in-range liquidity, fee tier and both token symbols.

Validate a Litecoin address before sending: base58check and bech32 checksum, address type, wrong-network detection, OFAC screening, and a send verdict for agents.

Stellar account lookup: XLM balance, reserve and spendable amount, asset balances, signers, thresholds and the memo-required flag, from Stellar Horizon.

Projectile motion with no drag: range, flight time, peak height, impact speed and angle, the optimal range angle and a trajectory table, with launch height.

Spain hourly electricity price today - OMIE wholesale spot and PVPC regulated tariff in EUR/MWh with cheapest and priciest hours from Red Electrica