Key
In Atlas, open Account → API keys and create a key at the Editor level (it reads and writes). The key is shown once.
export RUNLOG_API_KEY="rlka_..."Seerlka_… reaches every project you belong to, at your access there, 60 requests a minute, and is revoked on the same page. Calls draw on your plan’s allowance; with none, the first metered call answers 402 (Account → Billing).