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10 listed endpoints · free reliability snapshot (reduced density)
| endpoint | grade | uptime 30d | conf. |
| /books/pre-immersion_japanese/5 | D 43.8 | 98.2% | 0.67 |
| /books/pre-immersion_japanese/3 | D 43.9 | 98.2% | 0.67 |
| /books/pre-immersion_japanese/10 | D 44.3 | 98.2% | 0.67 |
| /books/pre-immersion_japanese/8 | D 44.5 | 98.2% | 0.68 |
| /books/pre-immersion_japanese/4 | D 44.5 | 98.2% | 0.68 |
| /books/pre-immersion_japanese/2 | D 44.5 | 98.2% | 0.68 |
| /books/pre-immersion_japanese/7 | D 44.7 | 98.3% | 0.68 |
| /books/pre-immersion_japanese/1 | D 44.8 | 98.3% | 0.68 |
| /books/pre-immersion_japanese/11 | D 44.8 | 98.3% | 0.68 |
| /books/pre-immersion_japanese/6 | D 44.9 | 98.3% | 0.68 |
Scores use reduced-density sampling; live probe, full 30-min density and 90-day history via the paid API.