EDI vs API, When to use each in B2B integrations

EDI and REST APIs are not alternatives to each other, they solve different needs. EDI is standardized, asynchronous and optimal for large B2B exchanges with dozens of partners. APIs are synchronous, custom and optimal for real-time proprietary integrations.

Standardization

EDI: Global standards (EDIFACT, EANCOM, ODETTE). REST API: Each partner defines its own API.

New-partner onboarding

EDI: Under 7 days with EDIconnect. REST API: Weeks–months of custom development.

Communication mode

EDI: Asynchronous (store-and-forward). REST API: Synchronous (request-response).

Offline / retry support

EDI: Native (VAN, AS2 MDN). REST API: Must be built manually.

Large batch volumes

EDI: Excellent (thousands of documents / batch). REST API: Costly (per request).

Latency

EDI: Seconds–minutes. REST API: Milliseconds.

RO fiscal compliance

EDI: Native (e-Invoice, e-Transport). REST API: Must be developed.

Required by RO retailers

EDI: Yes: all major retailers. REST API: Rarely (eMAG Marketplace).

Verdict

Use EDI for standardized B2B exchanges with retailers, distributors and logistics partners. Use APIs for internal integrations, marketplaces and mobile apps. EDIconnect delivers both: native EDI + API Gateway for REST integrations.