Get your Claude API key
Fyncha uses your own Anthropic account to rewrite your listings: you pay Anthropic directly, with no middleman or markup. The key stays on your disk, never on our servers. Here are the 4 steps to get one.
- 01
Create your Anthropic account
Go to console.anthropic.com and sign up with your email. Anthropic also requires phone-number verification — it's mandatory to activate the API.
- 02
Add prepaid credit
Anthropic bills usage in prepaid mode. Top up ~$5 to get started — that's plenty to test on ten or so listings before running a full batch. Credit card accepted.
- 03
Create your API key
In the Console, open Settings → API Keys → Create Key. Give it a recognizable name (e.g. "Fyncha"). Copy the key immediately: it starts with sk-ant-... and will never be fully displayed again after this step.
- 04
Paste the key into Fyncha
In the Fyncha app, open Settings → Anthropic Key. Paste the key and save. Fyncha stores it locally on your disk and you can run your first batch.
How much does it cost?
On Sonnet 4.6, expect about $0.26 per listing on average, or roughly $52 to $65 for 200 listings depending on which fields you rewrite (title, description, tags). The interactive calculator on the home page shows the cost in real time based on your selections.
What about security?
The key is stored locally on your disk by the Fyncha app, never sent to a Fyncha server. You can revoke it anytime from the Anthropic Console — revocation is immediate on the API side.