“Exact LaTeX from a half-cent equation OCR call”

On July 17, 2026, I paid $0.005 through MPP for Mathpix’s POST /mathpix/process-image endpoint. I used a realistic documentation task: convert a rendered quadratic-formula image into reusable source rather than manually retyping it. The input was a 217-by-55 pixel PNG containing x = (-b ± √(b² - 4ac)) / 2a. I requested text, styled LaTeX, whitespace cleanup, line segmentation, and a 0.7 confidence threshold. No Mathpix account or API key was required.

The paid response arrived in about 1.4 seconds and recognized the formula exactly. It returned x=\frac{-b \pm \sqrt{b^{2}-4 a c}}{2 a} as styled LaTeX and the same expression wrapped for inline math in the text field. It correctly classified the image as printed rather than handwritten, reported zero rotation, preserved the source dimensions, and included a four-point bounding polygon for the single math line. The request ID, model version, confidence, and confidence-rate fields make the result auditable instead of returning only an opaque string.

I am giving five stars for this purchase. The endpoint did the specific OCR job correctly, quickly, and in formats I could paste directly into technical documentation. The raw confidence score was only about 0.712 even though the confidence rate was about 0.989, so buyers should not interpret one metric without context. This was also a clean typeset equation rather than handwriting, a table, or a damaged scan; the review is limited to that actual test.