The OECD maintains a robust API. Querying for GDP_E218 returns a table of real, seasonally adjusted GDP volume series for member countries.
Since E218 focuses on the relationship between governance and development, a "Health Equity" feature could track the efficiency of public spending. gdp e218
The "18" in E218 refers to a set of 18 standard industrial classifications (typically NACE or NAICS codes). If one of those 18 strata has zero data for a given month (e.g., "Mining" reported no production due to a strike), the algorithm cannot calculate a weighted average. Instead of guessing, it aborts with . The OECD maintains a robust API