GDP per Capita Weighted Mean Calculator

Choose this endpoint when you need a statistically weighted mean of GDP per capita across multiple observations (up to 200), and you want explicit formula documentation and unit clarity alongside the result. It is ideal when you have custom nonnegative weights (e.g. trade shares, portfolio allocations, population shares) that differ from simple arithmetic averaging. Prefer this over pooled ratio calculators when you want a weighted statistical mean rather than an aggregate accounting ratio.

• Fewer than 2 rows supplied — minimum array length is 2
• More than 200 rows supplied — exceeds maximum
• Population value of zero supplied — exclusiveMinimum constraint violated
• Weights array length does not match rows array length
• Negative weight values provided — only nonnegative weights allowed
• GDP or population values exceed maximum of 1,000,000,000,000
• Missing required fields (gdp or population) in a row object
• Payment not included or insufficient — endpoint requires 0.01 USDC via x402