① Run this — your key is already in it
curl https://api.flatkey.ai/v1/chat/completions \
-H "Authorization: Bearer fk-live-8f3a…" \
-d '{"model":"gpt-5.5", "messages":[…]}'
② Watching for your first response…
✓ 200 OK — 412ms
{"choices":[{"message":{"content":
"Hello from the official GPT-5.5 API"}}],
"usage":{"total_tokens":24,"cost":"$0.00003"}}
First call complete. You're live.
flatkey
balance $2.00 · free credit