Payments API

Payment

Square

Unified commerce API for in-person and online payments, inventory, and customer management

Reported Latency

Typical performance from public reports -- not live measurements

Average: 310ms
p50
250ms
p95
620ms
p99
1,000ms

Reliability

99.97%observed uptime

Pricing

Free tier

No monthly fee

Paid starts at

2.6% + $0.10 per transaction

Technical Details

Authentication

OAuth 2.0

Rate limit

Varies by endpoint

Protocols

REST

SDKs

PythonNode.jsRubyJavaPHP.NET

Regions

USCAAUJPUKEU
DocumentationBase URL

Last updated: 2026-04-12