Three days ago I knew exactly what a DeepSeek call cost me. I had wired DeepSeek V4 Pro 0813 into a Spring Boot app with Spring AI, and the math was simple: $0.435 per million input tokens, $0.87 per million output tokens, and a cache-hit rate so aggressive that long agent sessions stayed embarrassingly cheap ( I wrote up the integration ). Then the pricing update landed, and tokens suddenly have rush hour. DeepSeek's official announcement introduces peak and off-peak billing: off-peak r...