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Coverage is uneven. Breadth and depth are different questions, and conflating them is how teams get surprised in production, so both are published.

Countries

The long tail is annual World Bank series, marked fallbackOnly. Real data, useful for context, and unsuitable for anything time sensitive. If you need a live panel, build against the 50. If you need breadth for a map or a ranking, the 268 are there and honestly labelled.

The rest

Check, do not assume

Coverage changes as publishers add and retire series. Three endpoints answer the question directly rather than by trial and error.
1

What exists overall

2

What exists for one country

3

Which countries have one indicator

An empty data array means the series does not exist for that entity. It is not an error and does not retry into existence. Check availability first.