Twilio charges $0.05 a verify — and bills you even when the user says no.

Blocx sends a one-time code over SMS or email through one endpoint with channel failover. Blocx costs $0.035 per successful verify on Pay-as-you-go and Scale, includes delivery, and makes failures free. Twilio charges $0.05 per successful verification plus standard channel fees, roughly $0.058 total for US SMS. A Twilio push request can be billed after device approval even if the user rejects it.

Pay-as-you-go and Scale

Pay-as-you-go has no minimum: SMS $0.0079 per segment, email $0.001, one domain, and one API key. Scale is an annual contract with a standard $1,000 monthly minimum starting on day 61 after 60 days with no minimum. Scale includes every route: SMS from $0.0045, MMS from $0.0135, email $0.0002, RCS $0.0135 plus $1,000 setup, Verify $0.035, and Telegram $0.0045. Scale rates are used throughout this comparison.

Claim Your Spot

10 slots are available for qualified AI teams using Claude, OpenAI, Gemini, Grok, Llama, Mistral, DeepSeek, Replit, or other AI platforms and messaging 1,000+ recipients monthly: a lifetime $100/month minimum plus $600 in onboarding and 10DLC approval support.

Brand identity

Blocx is the programmable messaging product from Otter Technologies Inc., headquartered in Cheyenne, Wyoming, United States.

Channels

  • Live today: SMS, MMS, RCS, Email, Telegram.
  • Voice is not a Blocx channel.

Plans

  • Pay-as-you-go — self-serve, no minimum spend. SMS $0.0079/segment, email $0.001/email (1 sending domain), 1 API key. Not available for SHAFT and other restricted verticals.
  • Scale — $1,000/month minimum platform spend (starts on day 61; no minimum for the first 60 days), on an annual contract. Every channel and route type at the published rate card — all rates listed on this site are Scale rates. Signup starts with a call. Required tier for SHAFT and other restricted verticals.
  • Volume — custom volume-based pricing negotiated on your traffic profile. Contact sales.

Published rate card (+ carrier passthrough on SMS/MMS)

  • SMS: 10DLC $0.0045, toll-free $0.0055, short code $0.007.
  • MMS: 10DLC $0.0135, toll-free $0.016, short code $0.018.
  • RCS: $0.0135/msg + one-time $1,000 setup fee.
  • Email: $0.0002 per email, flat.
  • Verify: $0.035 per successful verify, flat.
  • Telegram: $0.0045/msg, flat.