Step 1: Initial Request

Send your text and voice preferences. You will receive a 402 Payment Required response.

curl -X POST https://sats4ai.com/api/l402/tts \
-H "Content-Type: application/json" \
-d '{
  "text": "Hello, this is a test of the text to speech service.",
  "voice": "English_American_Female1",
  "speed": 1.0
}' \
-i

Expected Response Headers:

www-authenticate: L402 macaroon="<YOUR_MACAROON>", invoice="<LIGHTNING_INVOICE>"

Step 2: Pay the Lightning Invoice

Pay the invoice and save the preimage.

Step 3: Final Request

Send the exact same request with the Authorization header.

Important: The JSON payload must be identical to Step 1.

curl -X POST https://sats4ai.com/api/l402/tts \
-H "Content-Type: application/json" \
-H "Authorization: L402 <YOUR_MACAROON_STRING_HERE>:<YOUR_PREIMAGE_HERE>" \
-d '{
  "text": "Hello, this is a test of the text to speech service.",
  "voice": "English_American_Female1",
  "speed": 1.0
}'

Expected Successful Response:

{ "audioUrl": "https://..." }

The returned URL is a temporary link to the generated audio file. Download it promptly — media URLs expire after 2 hours.

Request Body Parameters