Cost Breakdown
PostmanSG does not charge the user. Sending emails are free. Sending SMS depends on Twilio's SMS pricing and the recipient's country code. Sending Telegram bot messages are free.

Email

Channel
Email
Password Protected Email
Recurrent cost ($)
$0
$0
Operation cost ($)
$0
$0

SMS

Prerequisite: Twilio account
Twilio provides simple and flexible pricing plans for different tiers of users. Please visit https://www.twilio.com/sms/pricing/sg for the latest information on SMS cost. U.S. phone number costs $1 USD per month.
Twilio Payment Schemes
What do you need?
Pay-as-you-go
Corporate credit card
Volume discount
Procure by contacting Twilio sales
Committed-use discounts
Procure by contacting Twilio sales
Recurrent cost ($)
USD $1 per phone line (US number) USD $75 per phone line (Singapore number)
Operation cost ($)
USD $0.0395 (3.95 cents) per SMS

How to evaluate Twilio's product?

Twilio's baseline send rate is 10 messages per second. You need to contact their sales team if you want a custom send rate for your use case.
Figuring out what to get from Twilio is like selecting for your mobile plan from a Telco. It depends on your needs. The main considerations are:
  1. 1.
    Volume
  2. 2.
    Frequency
For example, if you are sending a campaign once daily and <1000 SMS at a time, then you don't need to buy multiple phone numbers or increase the baseline send rate of 10 messages per second. The default option is good enough for your use case. However, you are sending a campaign four times a day and at the volume of 50k SMS at a time then you might want to consider sending it at a higher rate. You need to contact Twilio sales to find out the cost of setting a higher send rate for your agency.

Telegram Bot

Prerequisite: Your own prepaid phone card that has Telegram installed on it.
Channel
Telegram Bot
Recurrent cost ($)
$x depending on your prepaid phone card
Operation cost ($)
$0
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On this page
Email
SMS
How to evaluate Twilio's product?
Telegram Bot