PDF Signature Insert API

PDF Signature Insert API — Overlay a signature image at chosen page/x/y/scale.

What you get

• POST /v1/pdf/sign — primary endpoint.
• X-API-Key authentication, per-key rate limits, audit log.
• OpenRouter-backed where AI is involved — no model keys to manage on your side.
• Interactive Swagger docs at api-pdf-sign.knowlez.com/docs.

Plans

• Starter — $9/mo · 500 docs included · $0.02/doc overage.
• Pro — $29/mo · 5,000 docs included · $0.01/doc overage.