Compare one series across up to 10 countries in one call

One series (e.g. vat, policy-rate, minimum-wage, corporate-tax) for up to 10 countries on this brand. Each row is the value GET /v1/{country}/{series} serves, with its own source, dates and labels; requested countries without the series are listed under missing with the reason. A missing or malformed parameter, more than 10 countries, or no matching country at all is refused free (400/404) before any payment.