StackFill

API changelog

StackFill API changelog.

Changes to the public /v1 API, browser widget, OpenAPI contract, and webhook events.

2026-08-06

  • Added stable code-first substrate resolution for the Wells & Drew Wove and Textured paper catalog.
  • Added deterministic eggshell, laid, linen, and stipple finish rendering to SVG and PNG proofs.
  • Made substrate hex optional when a registry code, key, or name is supplied; unknown stocks fall back safely.

2026-07-15

  • Added browser-authenticated live PNG previews for current embed fill state.
  • Added exact CSS-width × DPR raster sizing, strong state ETags, and content-addressed preview caching.
  • Documented fields[].id as the recommended values and assignments key while retaining label compatibility.
  • Extended server-side template previews with documented values and assignments support.

2026-05-23

  • Published the first generated API reference surface.
  • Published public OpenAPI and Postman artifacts.
  • Documented current embed save-only workflow and webhook delivery limits.