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Velocity caps before production OTP
Gate production OTP with velocity and cooldown caps before the prepaid wallet is empty — limits by identity, destination, and window with honest statuses.
Launching production OTP without automated velocity caps exposes your messaging balance to rapid depletion from toll fraud and bot floods. You must enforce strict, tiered throttles anchored to destination numbers, client IPs, and device fingerprints to choke high-frequency dispatch attempts before they incur carrier charges. These rate gates work alongside your OTP TTL and resend cooldown logic rather than replacing standard OTP delivery vs verify two debits ledgers. Pair these controls with OTP abuse: first controls on the buyer path, rigid wallet stop-lines before production, and systematic OTP abuse and cost guardrails to safeguard your infrastructure.
Velocity is not the same as TTL
TTL defines code lifespan, while velocity limits intent rates per identity/destination/window. Confusing them risks silent wallet drain under TTL compliance. Both are critical — status must clarify which cap triggered rejection.
Caps by identity destination and window
| Cap | Window question | Fail closed means |
|---|---|---|
| Per identity/account | OTP intents/hour | Rate-limited |
| Per destination class | Corridor burst | Corridor blocked |
| Per IP/device family | Bot-driven minting | Challenge/reject |
| Wallet stop-line | Spending past threshold | Hold refuses send |
Export the cap that fired with each intent ID. Soft USD 1,000/month limits require honest status for uncapped OTP. Wallet stop-lines: Wallet stop-lines before production.
Gate prod OTP before Live language
Velocity caps must be active and tested before any OTP production language is enabled. A ‘green smoke’ on a single path doesn’t prove velocity control. Finance must correlate limited intents with wallet holds. Launch honesty: When launch is blocked: status without lying.
Honest limit status for product and finance
When velocity caps block OTP, status must explicitly state ‘limited’ or ‘rejected’ — never ‘delivered’ or silent drop. Product and finance teams share this language (Shared status language for product and finance). Retries with the same idempotency key should respect the cap, not bypass it. Two-debit clarity remains separate: OTP delivery vs verify two debits.
Buyer checklist for velocity caps
- Caps exist for identity and destination class before OTP goes live?
- Fail-closed tested: does burst behavior return honest limits?
- Exported intent data includes the cap name that triggered rejection?
- Live/prod language disabled while caps are in draft state?
- Wallet stop-lines pre-configured to work with velocity rules?
Start with IOSOR
Begin with USD 20 pilot funding for velocity testing. IOSOR’s white-label model ensures buyers see only limit outcomes, avoiding exposure to internal pricing details.
IOSOR takeaway
Use USD 20 to prove velocity caps on small corridors. Soft USD 1,000/month reviews prevent uncontrolled debt. Always pair velocity gates with wallet stop-lines for full transparency in status.
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