EDI and APIs both move business data between companies without manual rekeying, but they work differently. EDI sends standardised documents, usually in batches, over an agreed connection. An API (application programming interface) lets one system call another directly and get an immediate response.
The practical difference is conversation. EDI sends a document and waits. An API asks a question and gets an answer straight away.
Side-by-side comparison
| EDI | API | |
|---|---|---|
| Exchange style | Documents, often batched | Direct calls, real time |
| Timing | Scheduled or near real time | Immediate |
| Standardisation | Mature standards (X12, EDIFACT) | No universal standard across vendors |
| Typical use | Purchase orders, invoices, ship notices | Stock checks, pricing, order status |
| Setup | Partner-by-partner onboarding | Depends on the other system’s API |
| Two-way queries | Not really, each document is one way | Yes, request and response |
| Adoption in distribution | Widespread with larger partners | Growing, uneven |
| Cost model | VAN fees, translation, per-partner setup | Development time, hosting |
Where each works better
EDI suits high-volume, repeatable document exchange with partners who already use it, especially where a large retailer mandates it. It is well understood, well supported and backed by standards that have not changed much in decades.
APIs suit anything that needs an immediate answer: checking stock before a buyer commits, confirming a price, pulling live order status into a portal. Waiting for a batch file to answer “is this in stock right now” does not work.
It is not an either-or choice
Most distributors end up running both. EDI handles the formal documents their largest trading partners require. APIs connect their ERP to their webshop, their portal, their logistics provider and any automation layer sitting on top of the order desk.
The common pattern looks like this:
- EDI in and out with major retail accounts
- APIs between internal systems and the ERP
- Email, PDF, phone and fax for everyone else
That third line is usually the largest by order count and the smallest by automation, which is where most of the manual work sits.
Questions worth asking before choosing
- Does the trading partner mandate a specific method? Many do, which settles it.
- Does the use case need a real-time answer, or will a batch do?
- How many partners would need onboarding, and at what cost each?
- Does the other system actually expose an API, and is it documented?
- Who maintains the connection when the other side changes something?
- What happens to the orders that fit neither method?
The part neither solves
EDI and APIs both move data. Neither decides what to do when the data is a problem. An EDI 850 containing a discontinued item, or an API-placed order for stock that ran out an hour ago, still needs someone to work out the alternative and get the customer to agree it.
That judgement work is what tends to remain after an integration project is finished, and it is usually the larger share of the order desk’s time. How that layer connects to your existing systems is covered in this guide to connecting an AI agent to your order desk.
How Ordana helps
Ordana sits above the question of how an order arrived. The Ordana Desk Agent processes EDI orders, API and portal orders, and the email, fax, PDF, phone and text orders that neither method covers, applying the same validation and the same exception handling to all of them.
It connects to your ERP through pre-built connectors for platforms including NetSuite, SAP, Sage and Microsoft Dynamics, so your existing EDI and API connections stay as they are. Ordana describes deployment in days rather than months, with the first automated order typically processed within 24 hours of go-live.
Schedule a demo to see orders from every method handled in one flow.
Frequently asked questions
Are APIs replacing EDI?
Not in distribution. EDI remains mandated by many large retailers, so most businesses run both.
Which is cheaper?
It depends on partner count and existing infrastructure. EDI carries per-partner setup and often network fees, while APIs carry development and maintenance time.
Can EDI be real time?
EDI can run close to real time over AS2, but it remains document exchange rather than a two-way query.
What about customers who use neither?
They order by email, phone, fax or text, and in most distributors they represent the majority of orders.
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