Amazon Polly endpoints and quotas - AWS General Reference

Amazon Polly endpoints and quotas

The following are the service endpoints and service quotas for this service. To connect programmatically to an AWS service, you use an endpoint. In addition to the standard AWS endpoints, some AWS services offer FIPS endpoints in selected Regions. For more information, see AWS service endpoints. Service quotas, also referred to as limits, are the maximum number of service resources or operations for your AWS account. For more information, see AWS service quotas.

Service endpoints

Region Name Region Endpoint Protocol
US East (Ohio) us-east-2

polly.us-east-2.amazonaws.com

polly-fips.us-east-2.amazonaws.com

HTTPS

HTTPS

US East (N. Virginia) us-east-1

polly.us-east-1.amazonaws.com

polly-fips.us-east-1.amazonaws.com

HTTPS

HTTPS

US West (N. California) us-west-1

polly.us-west-1.amazonaws.com

polly-fips.us-west-1.amazonaws.com

HTTPS

HTTPS

US West (Oregon) us-west-2

polly.us-west-2.amazonaws.com

polly-fips.us-west-2.amazonaws.com

HTTPS

HTTPS

Africa (Cape Town) af-south-1 polly.af-south-1.amazonaws.com HTTPS
Asia Pacific (Hong Kong) ap-east-1 polly.ap-east-1.amazonaws.com HTTPS
Asia Pacific (Mumbai) ap-south-1 polly.ap-south-1.amazonaws.com HTTPS
Asia Pacific (Seoul) ap-northeast-2 polly.ap-northeast-2.amazonaws.com HTTPS
Asia Pacific (Singapore) ap-southeast-1 polly.ap-southeast-1.amazonaws.com HTTPS
Asia Pacific (Sydney) ap-southeast-2 polly.ap-southeast-2.amazonaws.com HTTPS
Asia Pacific (Tokyo) ap-northeast-1 polly.ap-northeast-1.amazonaws.com HTTPS
Canada (Central) ca-central-1 polly.ca-central-1.amazonaws.com HTTPS
Europe (Frankfurt) eu-central-1 polly.eu-central-1.amazonaws.com HTTPS
Europe (Ireland) eu-west-1 polly.eu-west-1.amazonaws.com HTTPS
Europe (London) eu-west-2 polly.eu-west-2.amazonaws.com HTTPS
Europe (Paris) eu-west-3 polly.eu-west-3.amazonaws.com HTTPS
Europe (Stockholm) eu-north-1 polly.eu-north-1.amazonaws.com HTTPS
Middle East (Bahrain) me-south-1 polly.me-south-1.amazonaws.com HTTPS
South America (São Paulo) sa-east-1 polly.sa-east-1.amazonaws.com HTTPS
AWS GovCloud (US-West) us-gov-west-1

polly.us-gov-west-1.amazonaws.com

polly-fips.us-gov-west-1.amazonaws.com

HTTPS

HTTPS

Service quotas

Name Default Adjustable Description
Concurrent connections Each supported Region: 90 Yes The maximum number of concurrent connections in this account in the current region.
Lexicon count Each supported Region: 100 No The maximum number of lexicons you can have in this account in the current region.
Lexicon size Each supported Region: 4,000 No The maximum size of a single lexicon in characters.
Rate of GetSpeechSynthesisTask and ListSpeechSynthesisTasks requests Each supported Region: 10 Yes The maximum number of GetSpeechSynthesisTask and ListSpeechSynthesisTasks requests per second that you can send in this account in the current region.
Rate of StartSpeechSynthesisTask (neural) requests Each supported Region: 1 Yes The maximum number of StartSpeechSynthesisTask (neural engine) requests per second that you can send in this account in the current region.
Rate of StartSpeechSynthesisTask (standard) requests Each supported Region: 10 Yes The maximum number of StartSpeechSynthesisTask (standard engine) requests per second that you can send in this account in the current region.
Rate of SynthesizeSpeech (neural) requests Each supported Region: 8 Yes The maximum number of SynthesizeSpeech (neural engine) requests per second that you can send in this account in the current region.
Rate of SynthesizeSpeech (standard) requests Each supported Region: 80 Yes The maximum number of SynthesizeSpeech (standard engine) requests per second that you can send in this account in the current region. This also includes DescribeVoices requests.
Rate of lexicon management requests Each supported Region: 2 Yes The maximum number of lexicon management requests per second that you can send in this account in the current region. This limit applies to following operations combined: ListLexicon, GetLexicon, PutLexicon, DeleteLexicon.
StartSpeechSynthesisTask billed characters count Each supported Region: 100,000 Yes Maximum size of the StartSpeechSynthesisTask input text in billed characters. SSML tags are not counted as billed characters. Applies to both standard and neural synthesis.
StartSpeechSynthesisTask lexicon count Each supported Region: 5 No Maximum number of lexicons that can be used with StartSpeechSynthesisTask operation. Applies to both standard and neural synthesis.
StartSpeechSynthesisTask total characters limit Each supported Region: 200,000 Yes Maximum size of the StartSpeechSynthesisTask input text in characters, including SSML tags and whitespace. Applies to both standard and neural synthesis.
SynthesizeSpeech billed character count Each supported Region: 3,000 Yes Maximum size of the SynthesizeSpeech input text in billed characters. SSML tags are not counted as billed characters. Applies to both standard and neural synthesis.
SynthesizeSpeech lexicon count Each supported Region: 5 No Maximum number of lexicons that can be used with SynthesizeSpeech operation. Applies to both standard and neural synthesis.
SynthesizeSpeech total character count Each supported Region: 6,000 Yes Maximum size of the SynthesizeSpeech input text in characters, including SSML tags and whitespace. Applies to both standard and neural synthesis.

For more information, see Quotas in the Amazon Polly Developer Guide.