Characters, measured · Measured endpoints

Standard bases draw on a canvas 28px larger than image_size (64 → 92, 104 → 132). A directions reference is placed on it as is, centred, pixel for pixel.
Pro Flash returns exactly the requested canvas, and refuses a style_image larger than it ("Style image must fit the native canvas"). Its /pro-flash/cost answer for operation=character was image 5 up to 96px, 6 from 100 to 208px, 9 at 224px and above, plus rotations equal to v3's ceil(side² × 8 / 65536) on the padded square canvas; two live jobs (7 and 2) billed exactly the estimate. first_frame bills the rotations only.
A 64px create-character-state moved the balance by about 22 against the 20 to 40 tier documented; other jobs were running on the account, so it is a rough number.
animate-character with custom_start_frame and end_frame may return frames taller than the rotation (92 × 104 for a crouch). enhance_prompt writes the expanded text into the animation's animation_type.
Request validation is strict: an unknown body field is a 422 listing every problem at once, which is a free way to check a body's shape.