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You need two things: the base URL and your API key. Your key starts with codex_ and came from Nomos.
1

Keep the Key Out of Your Code

Put it in an environment variable, never in code you share.
2

Make Your First Call

The top of the all-time leaderboard:
3

Explore

Every endpoint in the API Reference has a playground: paste your key under Authorization and send real requests.
Questions, a higher rate, or a lost key: ask Ryley at Nomos.