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The Developer API has no usage limits: no monthly quotas or total-call caps. What you build against is a rate limit:
  • 1,000 requests per second, per workspace. Every /v1 endpoint counts against it, and all of a workspace’s credentials (PATs and OAuth apps) share the same budget.

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Going over the limit

Requests beyond the limit are rejected with 429 Too Many Requests. Back off briefly and retry. Exponential backoff with a little jitter is plenty.
Pushing a large batch, like seeding contacts or email versions from a big table? Pace the run instead of firing everything at once. Most integration tools have a rate-limit setting.