Sonic Guide

Sonic is dedicated to providing its shippers with the most consistent and quality shipping service. They are an express shipping expert within Florida and have served the state for 30+ years. Get reliable next- and same-day shipping today with Sonic and EasyPost.

This guide includes detailed information on utilizing Sonic shipping with the EasyPost API, focusing on account setup, rates, label creation, manifests, tracking, and more.


Account Registration

Sign up for an EasyPost account to obtain a Test and Production API key. See Authentication and Key Management for more information.

Note: Negotiated rates are only available in Production mode.

Carrier Setup

Upon sign-up with EasyPost, users gain immediate access to Default Carrier Accounts, which can be enabled directly from the dashboard. For additional carriers, EasyPost supports a Bring Your Own Account (BYOA) option. This requires users to register directly with the respective carrier.

Sonic Shipper Account Registration

  1. Complete registration on the Sonic website. Once registered, a representative will be in touch for additional details regarding the account.
  2. Inform Sonic about using EasyPost's API for label purchases.
  3. Acquire rates and align any additional shipping needs.
  4. Obtain Sonic production and test account credentials:
    1. Sonic Username
    2. Sonic Password
    3. Sonic Account Number
  5. Input carrier-specific credentials within the EasyPost Carrier Account Dashboard for comprehensive rate access.

Sonic Account via API

The API structure specified by EasyPost can also be used to add Sonic carrier shipper account.

curl -X POST \
  -H 'Content-Type: application/json' \
  -d '{
  "type": "SonicAccount",
  "description": "SonicAccount",
  "carrier_account": {
    "credentials": {
      "account_number": "VALUE",
      "password": "VALUE",
      "username": "VALUE"
    "test_credentials": {
      "account_number": "VALUE",
      "password": "VALUE",
      "username": "VALUE"

Software Requirements

Download an EasyPost Client Library or utilize the REST API with cURL.

Documentation Review

Examine the EasyPost Objects section to understand the API's structure, which is critical for constructing requests and interpreting responses.


Sonic handles billing directly using a bill-on delivery system. EasyPost does not participate in the billing process for Sonic services. Contact a

Sonic representative for details.

Service Levels

Sonic delivers 6 days per week (Monday - Saturday). The service levels through EasyPost include:

Transit Time
Max Dimensions (inches)
Max Weight (ounces)

Coverage Area

Sonic supports next-day and same-day delivery within Florida.

Parcel Restrictions

There is a weight limit of 100 lbs on the NEXTDAY service level.

Predefined Packages

There are no predefined packages for Sonic.

Generating Shipping Labels

With EasyPost, generating shipping labels for Sonic is the same process as generating them for any other carrier.

Review the Getting Started Guide for help generating a shipping label.

Supported Options

Voiding Labels

Voiding Sonic labels through EasyPost is supported.

Label Formats

EasyPost offers native Sonic labels in PNG, ZPL, and PNG formats.


Manifesting is not supported or required for Sonic.


Returns are not supported for the EasyPost Sonic integration.

Hazardous Materials (HAZMAT)

This guide does not specify handling hazardous materials with Sonic. Shippers are advised to contact Sonic directly for specific guidelines and compliance requirements.


Returns are not supported for the EasyPost Sonic integration. regular pickups can be arranged directly with Sonic during the account registration process, they cannot be scheduled via the EasyPost API.


EasyPost simplifies package tracking by offering two methods:

  • Tracking with an existing number and carrier.
  • Using a Tracker included with an EasyPost-purchased shipping label.

The service integrates webhooks for timely shipment updates. For detailed information on tracking methods, visit the Tracking Guide.

Additional Resources

Carrier Metadata

The Carrier Metadata endpoint can programmatically return information about service levels, predefined packages, supported features, and shipment options.

Use this information to quickly integrate and make educated decisions about the mix of carriers for shipping needs. Additionally, the Carrier Metadata endpoint is available to retrieve comprehensive information about all carriers on the EasyPost platform, enhancing decision-making for carrier services.

Support and Troubleshooting

In addition to the guidance provided in our Carrier Guides, EasyPost offers support to assist with FAQs, troubleshooting issues, and inquiries related to the EasyPost platform.

Please visit the Help Center for more information.

Talk to a Shipping Expert

For questions about getting started with the EasyPost API please talk to a Shipping Expert or contact our Support team.