Vextorium

Historical ECB euro reference exchange rate for any date since 1999 and conversion between any two published currencies.

Official tokenized versions of a US stock or ETF on Solana (xStocks by Backed and Ondo Global Markets): verified mint addresses, on-chain supply and issuer authority check. Accepts NVDA, NVDAx or NVDAon.

Solana wallet balances: SOL plus every SPL and Token-2022 token held (mint, amount, decimals), with USD value for USDC/USDT.

Daily ECB reference exchange rate of a currency against the euro for up to 5 years: latest, change, high, low, average and annualized volatility, with the series.

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.

Spanish business-day calculator: count business days between dates or add N business days, using Spain's national public holidays.

World stock exchanges clock: status (open, closed, lunch break), local time, today's session and next open for NYSE, Toronto, London, Euronext, Xetra, Madrid, Zurich, Tokyo, Hong Kong, Shanghai, India and Sydney.

US stock market clock (NYSE/Nasdaq): open, closed, pre-market or after-hours now (or at a given time), holiday reason, early closes, next open/close and upcoming holidays. Key for 24/7 tokenized stocks.

Live gas price on Base or Ethereum (gwei, base fee, priority fee) plus estimated USD cost of an ETH transfer, an ERC-20 transfer and a DEX swap, including Base L1 data fee. Priced with the Chainlink ETH/USD oracle.

Spanish tax ID validation (DNI/NIF, NIE and company CIF) with check-digit verification. Computed locally; the ID is not stored.

BIC/SWIFT code validation and parsing: bank, country, location and branch codes, test-code flag.

Official European Central Bank euro reference exchange rates (about 30 currencies) and currency conversion between any two of them, with reference date.

IBAN validation (ISO 13616 mod-97 and per-country length, SEPA membership; for Spain also the national CCC check digits and bank name). Computed locally, IBAN is not stored.

Address inspector for EVM chains: wallet (EOA), EIP-7702 delegated wallet or contract; bytecode size, ERC-20/721/1155 support, proxy implementation and beacon, nonce and native balance.

ENS profile: resolved address plus public text records (avatar, description, url, twitter, github, telegram, discord, email).

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

Recent activity of a Solana address: latest transaction signatures with slot, time, success or failure and memo (up to 25).

Average, minimum and maximum price of a fuel in every Spanish province right now, from cheapest to most expensive, with the national average. Official Ministry data updated every 30 minutes.

Email validation: syntax, domain MX records and disposable-domain flag. Sends no email; the address is not stored.

Spanish Official State Gazette (BOE) daily summary: every item of a given day with section, department and official links, filterable by section (e.g. civil service exams 'oposiciones', appointments, public procurement), department or title keywords.

Check any x402 endpoint before paying, without paying: price in USD per network, asset (flags anything that is not official USDC), pay-to address and whether it is a contract, authorization timeout, Bazaar metadata, and risk alerts with a clear verdict.

Latest headlines from international outlets via public RSS (BBC, NPR, The Guardian, Al Jazeera, DW, France 24), tech (TechCrunch, The Verge) or Spain (El País), newest first, with link to the article; keyword and time-window filters.

Historical ECB euro reference exchange rate for any date since 1999 and conversion between any two published currencies.

Latest block on an EVM chain: number, hash, time, age in seconds, transaction count, gas used % and base fee.

EVM developer utilities: keccak256 hash, function selector from a signature, EIP-55 checksum address and wei/gwei/ether conversion.

Impermanent loss calculator for Uniswap v2 (full range) and v3/v4 concentrated ranges: IL vs holding, out-of-range flag and final token mix.

ERC-20 allowance lookup: how much a spender can move from an owner's balance, flagging unlimited approvals.

Solana account inspector: whether it exists, type (wallet, token account, mint, program, program data), SOL balance, owner program and data size.

Solana priority fee estimator: recent per-slot priority fees (min, median, p75, p90, max micro-lamports per CU) and total cost in SOL for a 200k-CU transaction.

Solana transaction status by signature: confirmed / failed / processing, slot, time, fee in SOL, signers, programs invoked and token balance changes.