How OTP priority routing works
We route each OTP through the fastest live carrier path for that specific destination at that specific moment.
Unlike bulk SMS where least-cost routing makes sense, OTP routing is latency-first. Saving two paise isn't worth a five-second delivery delay on a login flow.
What the router considers
- The destination's home operator, detected from the numbering prefix.
- Live latency and success rate on each eligible route in the last 5 minutes.
- Whether that route has thrown any 5xx responses in the last minute.
- DLT template availability on each route.
The decision is made in under 1ms and surfaced in the webhook response so you can see which route was chosen for each send. Median OTP latency on SMSLocal is 2.3 seconds end-to-end.
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