API marketplace

The Bitcoin blockchain as an API, powered by mempool.space. Get live transaction-fee estimates in sat/vB (fastest, 30-minute, 1-hour, economy and minimum) plus a projection of the next mempool blocks, inspect the current mempool size and fee histogram, list recent blocks with their mining pool, size and fees, look up any block by height or hash, check any Bitcoin address for its confirmed balance, total received/sent and recent transactions, fetch any transaction with its inputs, outputs, fee and confirmation status, read the current difficulty adjustment and network hashrate, and get the live BTC price in major currencies. Every amount is in satoshis. Perfect for wallets and fee estimators, block explorers, address and payment monitoring, on-chain dashboards and analytics, and Bitcoin bots. No accounts, no upstream key. For coin market prices use the Crypto API and for DeFi TVL the DeFi API.

Uptime

100.0%

Latency

202ms

Subs

4,268

Decentralized-finance analytics as an API, powered by DefiLlama. Track the Total Value Locked (TVL) across more than 7,000 DeFi protocols ranked and filterable by blockchain and category (Lending, DEXes, Liquid Staking, Bridges, CDP and more), drill into any single protocol for its current TVL, per-chain breakdown, category, market cap and links, see how much value is locked on each of 450+ blockchains, read the circulating supply and peg of every major stablecoin (USDT, USDC, DAI and the rest), and find the best yield-farming pools with their base and reward APY, filterable by chain and project. Every figure is live and denominated in USD. Perfect for DeFi dashboards and portfolio trackers, yield aggregators, research and analytics tools, trading bots and crypto data sites. No accounts, no upstream key. For token spot prices use the Crypto API.

Uptime

100.0%

Latency

378ms

Subs

3,748

Format numbers in human-readable forms as an API. Spell any number in English words — handling thousands through quintillions, negatives and decimals (e.g. 1,234,567 → "one million two hundred thirty-four thousand five hundred sixty-seven", 12.56 → "twelve point five six"). Turn a whole number into its ordinal, both short (21 → 21st, 113 → 113th) and written out (twenty-first, one hundred thirteenth). And convert any whole number from 1 to 3999 to Roman numerals and back (2024 ⇄ MMXXIV), with strict validation. Everything runs locally, so it is fast and always available. Ideal for invoices, cheques and accounting, legal documents, internationalisation, accessibility (screen readers), education and any UI that turns digits into words.

Uptime

100.0%

Latency

99ms

Subs

4,406

US Treasury fiscal data as an API, live from the official api.fiscaldata.treasury.gov. Track the US national debt to the penny (total public debt outstanding, debt held by the public and intragovernmental holdings) for the latest day or any date range; get the average interest rates the US government pays on its securities (Treasury Bills, Notes, Bonds, TIPS and more); and look up the official US Treasury reporting exchange rates for ~170 world currencies, used to convert foreign currency to USD for government reporting. Ideal for debt clocks, macro-economic dashboards, fintech, research and data journalism. Public-domain US Treasury data.

Uptime

100.0%

Latency

449ms

Subs

4,151

US federal government spending as an API, live from the official USAspending.gov (US Treasury). Search federal awards — contracts, grants, loans and direct payments — by keyword, recipient, award type and fiscal year, ranked by amount, with the recipient name, dollar amount, awarding agency, description and award dates. Rank the top recipients of federal money for any search, and list and inspect the 100+ top-tier federal agencies with their budgetary resources. Ideal for government-transparency, investigative journalism, contractor intelligence, grants research, GovCon and policy-analysis applications. Public-domain US Treasury data.

Uptime

100.0%

Latency

454ms

Subs

3,437

ISO 18245 Merchant Category Codes (MCC) as an API — the 981 four-digit codes that Visa, Mastercard and other card networks use to classify a merchant's line of business. Look up any code (e.g. 5812 → Eating places and Restaurants, 5411 → Grocery Stores/Supermarkets, 3000 → United Airlines), search by description (e.g. "hotel", "airline", "pharmacy"), filter by IRS-reportable status, or list them all. Each record carries the network/edited description, USDA and IRS descriptions and whether the category is IRS 1099-reportable. Ideal for payments, fintech, expense management, fraud analysis and transaction enrichment.

Uptime

100.0%

Latency

93ms

Subs

3,078

The North American Industry Classification System (NAICS 2022) as an API — 2,100+ industry codes in a 5-level hierarchy (sector → subsector → industry group → industry → national industry). Look up any code (e.g. 541511 → Custom Computer Programming Services) with its full ancestor chain and direct children; search industries by title (e.g. "software", "restaurant"); or navigate the tree from the 20 top-level sectors down. NAICS is the standard used by US, Canadian and Mexican statistical agencies to classify business establishments. Ideal for business classification, market research, CRM enrichment, lead segmentation and economic analysis.

Uptime

100.0%

Latency

95ms

Subs

4,889

VAT, GST and sales-tax rates for 128 countries — plus US state and Canadian province sub-rates — with a built-in tax calculator. Get the standard rate for any country (e.g. DE → 19%), compute the tax and gross total on a net amount (e.g. €100 in Germany → €19 tax, €119 total), apply a US state or Canadian province rate, or list every country. Ideal for e-commerce checkouts, invoicing, SaaS billing and pricing tools. (Standard rates, not tax advice.)

Uptime

100.0%

Latency

95ms

Subs

4,219

The official ISO 10383 Market Identifier Code (MIC) registry as an API — 2,800+ stock exchanges and trading venues worldwide. Look up a venue by its MIC (e.g. XNAS, XLON), search by name, country, status or market category, and see the operating MIC, legal entity, LEI, city, website and active/expired status. Ideal for fintech, trade reporting, MiFID II compliance and broker tooling.

Uptime

100.0%

Latency

87ms

Subs

4,930

US public-company filings and financial statements straight from the U.S. SEC EDGAR system. Search 10,000+ companies (ticker → CIK), list a company's recent filings (10-K, 10-Q, 8-K and more) with document links, pull XBRL financial-statement time series (revenue, assets, net income and any GAAP concept) and run full-text search across all EDGAR filings. Ideal for fintech, fundamental analysis, compliance and research.

Uptime

100.0%

Latency

744ms

Subs

4,770

Search and look up the global register of legal entities (companies, funds, branches) by name or LEI, powered by the GLEIF Legal Entity Identifier system — roughly 2.6 million entities worldwide. Returns the official legal name, legal form, jurisdiction, registered address, entity status and registration details. Ideal for KYB, compliance, onboarding and supplier verification.

Uptime

100.0%

Latency

219ms

Subs

3,583

Validate IBANs with the ISO 7064 mod-97 checksum and per-country length and structure checks, and resolve the BIC and bank details for supported countries. A local parse endpoint works for every IBAN country offline; the validate endpoint adds bank-code verification and BIC. Ideal for payments, billing, onboarding and KYC.

Uptime

100.0%

Latency

192ms

Subs

3,929

Real-time quotes, historical price candles (OHLCV) and symbol search for stocks, ETFs, indices, foreign exchange and cryptocurrencies. Covers global markets — look up any ticker, index (^GSPC), FX pair (EURUSD=X) or coin (BTC-USD).

Uptime

100.0%

Latency

695ms

Subs

4,176

Live & historical foreign-exchange rates from the European Central Bank: latest rates, historical lookups, time-series and currency conversion across 30+ currencies.

Uptime

100.0%

Latency

160ms

Subs

3,638

Live cryptocurrency market data: prices, top coins & markets, price/OHLC charts, historical snapshots, trending coins, global stats, exchanges and categories.

Uptime

100.0%

Latency

630ms

Subs

3,678