Sophie Martin

carrier API rate limits

Carrier API Rate Limits Across 9 Providers, 2026

Published carrier API rate limits for FedEx, DHL, UPS, ShipEngine, Shippo, Easyship and EasyPost, sourced from vendor docs as of August 2026.

carrier webhook signature verification

How to Verify Carrier API Webhook Signatures

Verify webhook signatures from EasyPost, Shippo, and DHL step by step, with HMAC code, exact header names, and the raw-body bug that breaks it.

EasyPost vs ShipEngine

EasyPost vs ShipEngine for EU Carrier Contracts

EasyPost vs ShipEngine compared on connecting your own GLS, DPD, and DHL contracts: rate limits, sandbox fidelity, webhooks, and pricing.

carrier API uptime

Carrier API Uptime SLAs: 8 Vendors' Real Numbers

Published SLA terms vs. logged incident data for 8 carrier/multi-carrier APIs, sourced from status pages, as of August 2026.

DB Schenker EDIFACT

Sending a DB Schenker Transport Order via EDIFACT

Step-by-step guide to building a DB Schenker IFTMIN EDIFACT transport order, validating segments, and confirming receipt via IFTMCS.

Sendcloud vs nShift API

Sendcloud vs nShift: API DX for EU Carriers

We test Sendcloud vs nShift APIs on auth, docs, sandbox, and rate limits to pick the right EU multi-carrier integration for engineers.

multi-carrier API

Multi-Carrier API Coverage: 11 Vendors Compared

We pulled self-reported carrier counts from 11 multi-carrier APIs and TMS platforms as of July 2026, sourced page by page, with the gaps flagged.

DHL Parcel DE Shipping API migration

Migrating DHL SOAP v3 to Parcel DE API V2

Step-by-step migration from DHL's retired SOAP v3 shipping API to the REST Parcel DE Shipping API V2, with OAuth2 setup and rollback checks.

carrier API pricing

Carrier API Pricing 2026: What 7 Platforms Charge

Verified July 2026 pricing for EasyPost, Shippo, ShipEngine, Sendcloud, Easyship and more — per-label fees, overage costs, and hidden charges compared.

Carrier API Documentation Reality Check: DX Scoring Across 12 Major Providers — Why FedEx Leads While Regional Carriers Lag

Poor documentation across carriers introducing new APIs, adjusting label requirements, refining rules, and tightening documentation specifications at a rapid pace with little notice isn't just an integration nuisance anymore. When FedEx, UPS, and DHL update their APIs every few months while regional carriers struggle with basic endpoint descriptions,

API Versioning Governance Crisis: How to Build Emergency Frameworks That Prevent the 73% Production Failure Rate During 2026 Carrier Migration Deadlines

USPS Web Tools shut down on January 25, 2026, and FedEx SOAP endpoints retire on June 1, 2026. 73% of integration teams reported production authentication failures within weeks of carrier API deployments that sailed through sandbox testing. For enterprise teams managing thousands of shipments daily across multiple carriers, this creates

Carrier API Performance Benchmarking That Actually Predicts Production Reality — Building Test Harnesses That Close the 30-70% Sandbox-to-Production Gap

After testing dozens of carrier APIs over the past year, I've found rate limit discrepancies of 30-70% between documented limits and actual performance during peak hours. Within weeks of deployment, 73% of integration teams reported production authentication failures despite their OAuth 2.0 implementations passing every sandbox test.