Recent research papers on a topic from OpenAlex: title, year, citations, DOI and open-access link, most relevant first.

Clean bibliographic metadata for a DOI from Crossref: authors, journal, pages, publisher, license, plus a ready citation string.

Verify a citation: does the DOI exist, does its real title match the claimed title, and has it been retracted?

Country profile by name or ISO code: region, income group, capital and latest GDP, growth, inflation, jobs, population.

Find an x402 service by name or domain: category, endpoints, lowest price, status and 30-day buyers.

Competition check for an x402 idea: sellers, hosts, price range and how many have real buyers. Open space or crowded?

Search Coinbase's x402 Bazaar by topic: matching paid endpoints with price, 30-day calls and unique payers.

Size of the x402 market now: Bazaar resource count, x402-list services, endpoints, median price and average uptime.

Space weather right now: NOAA G, S and R scale levels now, 24-hour max and 3-day outlook, with a calm/active/storm verdict.

Active sunspot regions on the Sun now: count, complex magnetic types that can flare, and recent flare counts.

Rank up to 6 countries on one indicator (GDP, growth, inflation, unemployment...) with the year of each value.

Find countries by name fragment, World Bank region or income group, with ISO codes and capitals.

Country demographics: population, 10-year population growth, life expectancy and internet use, with an ageing/growing verdict.

Economy stress screen for a country: recession, high inflation, unemployment and debt flags from the latest World Bank data.

GDP growth record of a country over 5-30 years: average, worst and best year, recession years and volatility.

An economic or social indicator for a country over 3-40 years: values, change, average and trend direction.

Is this URL a valid x402 endpoint? Fetches it once unpaid and checks the 402 offer, price, chains and Bazaar listing block.

Price benchmark for x402 endpoints: low, median and high price among services with real buyers, by category.

Read a GIF's version, width, height and global colour table size from its first 13 bytes.

Identify a file type from the first bytes (hex): PNG, JPEG, PDF, ZIP, ELF, EXE, MP4, SQLite and 40+ more signatures.