With Amazon Lex, you pay only for what you use. You are charged based on the number of text or voice requests processed by your bot, at $0.004 per voice request, and $.00075 per text request. For example, the cost for 1,000 speech requests would be $4.00, and 1,000 text requests would cost $0.75. Your usage is measured in “requests processed”, which are added up at the end of the month to generate your monthly charges.

You can try Amazon Lex for free. From the date you get started with Amazon Lex, you can process up to 10,000 text requests and 5,000 speech requests per month for free for the first year.

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You can try Amazon Lex for free.

From the date you get started with Amazon Lex, you can process up to 10,000 text requests and 5,000 speech requests per month for free for the first year.

A bot that processes 4,000 speech requests and 1,000 text requests

Input requests to process Cost per request Number of requests Total
4,000 speech requests $0.004 4,000 requests $16.00
1,000 text requests $0.00075 1,000 requests $0.75
Total Amazon Lex charges for 4,000 speech and 1,000 text requests   $16.75

A bot that sends 500 speech requests and 500 text requests in December. Monthly charges for December:

Input requests to process Cost per request Number of requests Total
500 speech requests $0.004 500 requests $2.00
500 text requests $0.00075 500 requests $0.38
Total Amazon Lex charges for 500 speech and 500 text requests   $2.38