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the playground is quite useful, but we don't really link to it https://github.com/search?q=repo%3Amatrix-org%2Fmatrix.org%20playground.matrix.org&type=code or https://github.com/search?q=repo%3Amatrix-org%2Fmatrix.org+docs%2Fapi&type=code
the spec also only links to it, once, and not too obviously https://github.com/matrix-org/matrix-spec/blob/6f1e64cb1271189cfa6bc310564f35d895326671/content/_index.md?plain=1#L34