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Every webhook delivery to your endpoint originates from a single, stable address:
164.90.161.33
If your endpoint sits behind an IP allowlist or firewall, allow this address so deliveries reach you.
An IP allowlist is a coarse network filter, not authentication. It does not prove a request came from us: source addresses can be spoofed, and shared infrastructure can send from an allowed range. Always verify the signature on every event, whether or not you also filter by IP. The IP allowlist complements the signature; it never replaces it.
This address may change as our infrastructure evolves. When it does, we announce it on the changelog with advance notice, so treat it as configuration, not a constant to hardcode beyond your firewall rules.