1
Get an API key
Create a key in the Geko console. Keys look like
sk-tokay-…. Keep it server-side — treat it like a password. New accounts get $1.00 of free credits, and one key covers both directions.2
Make a sound
Pick whichever feels natural — all four do the same thing.
hello.wav is 24 kHz, 16-bit PCM mono. Play it:3
Read it back
Now the other direction — send that same file back and get the text.That’s the whole API — text in, audio out, audio in, text out. Same key, same balance.
Install the SDK
What next
Text-to-speech
Voices, streaming, the
nfe dial, and output formats.Speech-to-text
Code-switching, accepted audio, and accuracy numbers.
Use it in your app
Server-side Next.js / Express integration, done right.
Errors & retries
Handle failures cleanly in production.
First call slow? Both GPU backends scale to zero when idle, so a cold start can take tens of seconds; subsequent calls are fast. The SDK’s default 120 s timeout accounts for this. The two services warm independently.