Rate limits

The verify endpoints are throttled per API key, at your plan's rate_limit_per_minute. Because the limit is keyed by the key itself (not by IP), traffic from a shared NAT egress is not penalized, and a high-tier key can exceed the shared IP floor.

Handling a 429

When you exceed the limit the API returns 429 Too Many Requests with a Retry-After header in seconds. Wait that long, then retry, ideally with exponential backoff on repeated 429s.

Volume vs rate

The per-minute rate limit smooths bursts. Your monthly volume is bounded by your token wallet, not by a daily cap: each verification draws from the wallet, and a call against an empty wallet returns 402, not 429. Top up or upgrade to raise the ceiling.