Send Fax via API - Legally Secure & Digital.

In Germany, fax is still a standard for the legally secure transmission of documents. AgentBureau offers a modern API for an outdated but necessary communication channel.

Test Now Documentation

Why still Fax?

Authorities, insurance companies and legal entities in Germany require transmission with confirmation for many processes. A fax is often considered proof of receipt of a letter in German courts - unlike a simple email.

How it works

1

Request

Call the endpoint with an Idempotency-Key. Get a 402 Payment Required response with an intent ID.

2

Pay

Send USDC on Base to the provided wallet address. This registers your payment intent on-chain.

3

Authorize

Sign the intent ID with your wallet. This cryptographically binds the payment to your request.

4

Verify

Retry with your transaction hash and signature. Your service is executed within our SLA.

Transmission report included

You will receive a detailed transmission report for each fax sent as confirmation for your records.

Global delivery

Send faxes to any German number for only 1.00 USDC per page. Fast, secure and reliable.