BiGapiguides
POST /v1/pdf/verify-signature · 1 cent per operation

Verify PDF signature

Check PDF signatures: who signed, when, and whether the document is unchanged. The signature is verified with the signer certificate's key (RSA, PSS, ECDSA). No CA trust-chain check, the response says so.

Try it

curl -X POST https://api.bigapi.dev/v1/pdf/verify-signature -H 'Authorization: Bearer $KEY' -F 'file=@contract.pdf'

New keys come with 100 free operations, no signup: curl -X POST https://api.bigapi.dev/v1/keys. Failed calls cost nothing.

Parameters

NameMeaning
file requiredSigned PDF to check: who signed, when, and whether it was changed afterwards.

Result and price

1¢ · 1 cent per operation

Returns application/json. Response headers carry the cost (X-BigAPI-Cost) and notes about your input (X-BigAPI-Warnings).

From an agent (MCP)

Connect BiGapi as an MCP server: https://api.bigapi.dev/mcp (hosted) or npx -y @bigapi/mcp (local). Then ask in plain words; the agent finds pdf_verify_signature on its own.