Bitcoin mining over the last N blocks (max 144, ~1 day): blocks per pool (Foundry, AntPool, ViaBTC, F2Pool...) with share and estimated hashrate, average block reward (subsidy + fees), fees as % of reward and average block interval.

Bitcoin mining profitability now: hashprice (USD per TH/s per day) from the real subsidy and recent fees, and for your machine (hashrate, J/TH efficiency and power price) daily revenue, electricity cost, profit and break-even kWh price.

Bitcoin network now: block height and latest blocks, recommended fees in sat/vB to confirm in 1, 3, 6, 24 or 144 blocks, mempool size, difficulty, estimated hashrate and next difficulty adjustment (date and expected change), plus BTC price.

Status of a Bitcoin transaction by txid: confirmed or in mempool, confirmations, block, total fee and fee rate (sat/vB), size, RBF flag, inputs and outputs with amounts.

Block number closest to a date and time on EVM chains (ethereum, base, arbitrum, optimism, polygon, bsc, avax...), with the block's own timestamp. For historical state queries and event filters.

Live status of Bitcoin, Solana and 12 EVM chains (Ethereum, Base, Arbitrum, Optimism, Polygon, BNB Chain, Avalanche, Gnosis, Linea, Scroll, Sonic, Unichain): latest block, seconds since last block, gas and whether each network is ok, slow or halted.

Book data by ISBN (10 or 13) or search by title and author on Open Library: title, authors, publisher, year, pages, languages, subjects, cover and links.

Check whether a list of URLs, or every link on a page, works: HTTP status, final URL after redirects and broken links first. Up to 50 URLs per call, checked in parallel.

Build an EVM transaction ready to sign (never signed or sent): native transfer, ERC-20 transfer or ERC-20 approve, with to, data, value, nonce, chainId, estimated gas and current EIP-1559 fees, plus a simulation that warns if it would revert and the estimated cost.

Business days in 150+ countries and their regions: count between two dates, or the date after adding N business days, skipping weekends and official holidays, listing the holidays in the range.

Cardano wallet by address (addr1...) or stake account (stake1...): ADA balance, delegated pool and DRep, available rewards, native tokens and USD value.

Latest press releases from central banks and financial regulators (Federal Reserve, ECB, Bank of England, SEC, CFTC, ESMA) in one feed by date, with title, link and summary; filter by source or keyword (rate, crypto, stablecoin...).

Policy interest rate of about 40 central banks (Fed, ECB, BoE, BoJ, Banxico, BCB...): latest rate and date as a ranking, or one country's monthly history with every hike and cut. Bank for International Settlements data.

Compare two blockchains by DeFi TVL: value locked, share of the whole market and gas token, plus which one is bigger. Live from DefiLlama.

Reference data for a blockchain by its chainId: name, gas/native token, block explorers, number of public RPCs and website. Utility for multi-chain agents. Live from chainid.network (ethereum-lists, open data).

Statistics of an EVM chain: total and today's transactions, addresses, blocks, average block time, gas prices (slow, average, fast), network utilization, native token price and market cap.

Ranking of the DeFi protocols with the most TVL on a specific chain (Base, Solana, Arbitrum, BSC...), with category, 7-day change and share of the chain's TVL. Optional category filter.

TVL history of a blockchain: current value, all-time high and its date, distance from ATH, 30d and 1y change, plus a sampled series. Shows where a chain sits in the cycle. Live from DefiLlama.

Tamper-resistant price from Chainlink Data Feeds on Base (ETH/USD, BTC/USD, USDC/USD, or any Chainlink aggregator address), with update time and staleness in seconds.

Clinical trials on ClinicalTrials.gov by disease, drug or sponsor: title, NCT id, status, phase, conditions, interventions, sponsor, dates, enrollment and countries; recruiting ones by default.

Convert a color between HEX, RGB, HSL, HSV and CMYK and, given a background, compute the WCAG 2.x contrast ratio with AA/AAA pass flags; without background, suggests black or white text.

Monthly prices of about 70 commodities (Brent and WTI oil, natural gas, coal, gold, silver, copper, aluminium, wheat, maize, coffee, cocoa, sugar, fertilizers...) for the latest published month, with monthly and annual change. World Bank Pink Sheet.

Monthly price series of a commodity (gold, Brent, copper, wheat, coffee...) going back up to 60 years, with high, low and change over the period. World Bank Pink Sheet.

Company profile from its domain, without personal data: website title and description, social profiles, technologies used, email provider, domain age and registrar, SSL certificate and hosting country. Qualify B2B leads or vet a supplier.

Latest regulatory filings of a US listed company (8-K material events, 10-Q, 10-K, insider Form 4, 13D/G...) with date, 8-K items and direct document link. Optional filter by form type.

US listed company fundamentals from public SEC filings (XBRL): last quarters and years of revenue, net income, diluted EPS, operating cash flow, assets, liabilities, equity, cash, dividends and shares outstanding.

ABI of a verified EVM contract (Sourcify): every function with signature, selector, inputs, outputs and read/write flag, plus events with topic0 and proxy implementations. Ready-to-use signatures for leer-contrato.

Compute a contract address in advance: CREATE (deployer + nonce) or CREATE2 (deployer + salt + init code hash). For deterministic deployments and verifying announced addresses.

Who deployed an EVM contract and when: creator address (named when known), creation transaction and date, contract name, verification, proxy type and implementation, and scam flag.

Latest events emitted by an EVM contract from the event signature (e.g. Transfer(address indexed from,address indexed to,uint256 value)), decoded with parameter names, block and transaction hash, over the last N blocks.

Call any read-only (view) function of an EVM contract from its signature, e.g. balanceOf(address)(uint256), with arguments, and get the decoded result. Supports address, bool, intN/uintN, bytesN, string, bytes and arrays. Read-only: nothing is signed or sent.

Checks whether a smart contract's source code is verified and public on Sourcify, on any EVM chain: match type, contract name, compiler, number of functions and a sample. Verified code = transparent and auditable (not a safety guarantee). Live from Sourcify.

Convert coordinates between decimal degrees, degrees-minutes-seconds (40°25'00"N), UTM (zone, easting, northing) and geohash, in any direction, plus a map link.

Wallet on Cosmos Hub (cosmos1...), Osmosis (osmo1...) or Celestia (celestia1...): token balances, staked amount per validator, pending rewards, unbonding and USD value. Also accepts a validator (valoper) address and shows its account.

Key indicators of any country: GDP, real growth, GDP per capita, inflation, population, unemployment, public debt, exports, life expectancy and internet use, with the last years of each. World Bank open data.

Country profile: name, ISO codes, capital and its coordinates, region, income level, phone prefix, time zones and latest population and GDP per capita. World Bank and libphonenumber data.

World ranking of countries by a World Bank indicator (GDP, GDP per capita, growth, inflation, population, unemployment, public debt, life expectancy, CO2 per capita, renewables, FDI...), latest value of each country from the last 5 years.

Rust crate profile from crates.io: version, description, license, repository, docs, total and recent downloads, minimum Rust version, keywords and dates.

Validate a 5-field cron expression (ranges, steps, names, @daily aliases), explain it in plain English and list its next run times in any time zone, DST-aware.

Detect and validate a crypto address before sending funds: EVM (EIP-55 checksum), Solana, Bitcoin (legacy, P2SH, SegWit, Taproot), Litecoin, Dogecoin, Tron and Cosmos bech32, with its type and network. Computed locally.

Convert an amount between cryptocurrencies and currencies (0.5 BTC to ETH, 100 USDC to EUR, 1000 EUR to SOL) with live DefiLlama prices and ECB rates.

Correlation matrix of daily returns for 2-8 crypto assets over up to 2 years, with each asset's return and annualized volatility and the least correlated pair. For diversification and hedging. Prices from DefiLlama.

Latest crypto news headlines from CoinDesk, Cointelegraph, Decrypt, Bitcoin Magazine and The Block, newest first, with link to the original article; filter by keyword (bitcoin, ETF, Solana, SEC...), outlet and time window.

Current price of a list of cryptocurrencies by ticker (BTC, ETH, SOL...) or chain:contract, in USD or any ECB currency (EUR, GBP, JPY...). The simplest way to get prices.

Crypto price in any ECB currency (EUR, GBP, JPY, CHF...): on-chain USD price (Chainlink or Uniswap v3) converted with ECB reference rates.

Crypto price in USD and EUR from on-chain sources only: Chainlink oracles (BTC, ETH, USDC) or Uniswap v3 quotes on Base (USDT, DAI or any Base token address); EUR via ECB rate.

CSV cleaning and normalization to JSON: column names, types, duplicates and empty values. Data is processed in memory and not stored.

Run a read-only SQL query (SELECT/WITH, WHERE, GROUP BY, ORDER BY, window functions...) over a CSV loaded as table «datos» in a temporary in-memory SQLite database, and get the rows as JSON.

Profile a CSV (delimiter auto-detected): rows, columns, type of each column, nulls, unique values, min, max, mean, median, std, sum, top values, duplicate rows and a sample. Understand a dataset before using it.

Details of a vulnerability by id (CVE-2021-44228, GHSA-..., PYSEC-...): summary, description, severity and CVSS vector, affected packages, fixed versions and references. OSV.dev data.