How to Retrieve a Phone Number's SMS Pumping Score in Rust

SMS pumping fraud exploits phone-number input fields to generate messages to fraudster-controlled numbers, often showing patterns such as adjacent destination numbers, shared mobile network operators, and incomplete OTP verification cycles. The tutorial explains how Rust developers can use Twilio Lookup v2 Line Type Intelligence and the rustlio crate to retrieve a phone number’s SMS Pumping Risk Score, a 0–100 value derived from Twilio network signals including risky carriers, abnormal traffic, and low conversion rates. It outlines creating a Cargo project, adding required crates, storing Twilio credentials in environment variables, and making an asynchronous lookup request for SMS pumping risk data. Responses can include carrier risk category, Verify Fraud Guard blocking status and history, the numerical risk score, and any error code; Twilio recommends sending normally for scores below 60, adding friction for mild or moderate scores, and not sending for scores above 90. The score is not recommended for US or Canadian phone numbers, and the broader goal is to help organizations reduce fraud affecting OTPs, marketing, notifications, lead forms, and chatbot endpoints.

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