The B2B wholesale game has a credibility problem. Anyone with a website and a payment processor can call themselves a "verified supplier" — and plenty do. The buyers who get burned tend to be the ones who treated "looks professional" as the bar.
If you're sourcing from a new wholesale supplier you've never worked with before, here's the actual due diligence checklist that gets used in practice. Not Web 1.0 advice; the specific moves that catch real supply chain fraud.
1. Business registration check
The first 30 seconds. Get the legal entity name, the state of registration, and the EIN if they'll share it. Then:
- US suppliers: look them up on the Secretary of State website for whatever state they're registered in. Free, public, instant. Confirms the entity exists, when it was formed, and who the registered agent is.
- Foreign suppliers: verification depends on country. China has Alibaba's verification badges (worth roughly what you paid for them) plus the actual Chinese business registry, which is more reliable. EU companies have national company registries.
- LLCs and similar: the registered agent and the date of formation are tells. A "wholesale electronics distributor" that was formed three months ago and has a registered agent at a UPS Store is not what they're selling themselves as.
If a supplier refuses to share the legal entity name or won't let you verify registration, walk away. There's no good reason for that refusal.
2. Distributor agreement check
This is the big one for branded products. If a supplier claims to be an authorized distributor of, say, Samsung electronics or Dyson appliances, the brand itself usually publishes one of:
- A list of authorized distributors
- A "where to buy" or "find a partner" tool
- An email or phone line where you can verify a distributor relationship
It takes ten minutes and it kills entire categories of supply chain fraud. If a supplier is moving real, branded, in-warranty inventory at distributor pricing, they can name the distributor agreement they're operating under. If they can't — or if the brand can't confirm it — the inventory is gray market at best, counterfeit at worst.
3. Real references, real calls
Ask for three current customers, not curated case studies. Then actually call. Specific questions to ask the references:
- "How long have you been buying from them?"
- "Has any order ever arrived in materially different condition than the quote?"
- "How did they handle it?"
- "Anything you wish you'd known before your first order?"
That last question is the one that surfaces real information. Satisfied customers will still tell you the friction points if you give them room to.
4. Payment terms as a signal
Suppliers that demand 100% upfront wire transfer with no recourse — especially on a first order — are higher risk by definition. Common red flags:
- Wire-only (no credit card option, no escrow)
- "Personal account" wire instructions where the receiving account name doesn't match the business name
- Currency mismatches (US-presented supplier requesting wire to a non-US bank with no explanation)
- Refusal to use letters of credit or third-party escrow for large orders
Legitimate international suppliers do require wires sometimes. The difference is they'll accept escrow on first orders, they'll provide a real business bank account that matches their legal entity, and they'll explain why if anything looks unusual. The pattern that catches fraud is when none of those things are true at once.
5. The test order
Before you commit a full order, do a small one. A sample. A partial pallet. Whatever the supplier will accept as a test. Treat this as paid due diligence, not as inventory.
What you're actually testing:
- Lead time accuracy — does the order ship when promised?
- Communication — do they respond when there's a question?
- Condition — does what arrives match the quote?
- Documentation — invoices, packing slips, serial numbers, warranty paperwork?
- Authenticity — for branded goods, you can verify serial numbers with the manufacturer, often online.
A supplier that passes a small order and then fails a large one is rare. The opposite — passing small but failing large — almost never happens with legitimate operations and is a recognizable scam pattern.
6. Online reputation (read past page one)
Reviews are a noisy signal but worth checking. Three sources that matter more than Trustpilot:
- Better Business Bureau — for US companies, complaints with the BBB are public and often substantive.
- Industry forums — depending on category, there are forums where buyers actually compare notes. Reddit's r/Flipping, r/wholesalehookups, and similar communities have surprisingly useful long-form threads on specific suppliers.
- Google with specific operators — searching
"[supplier name]" scamor"[supplier name]" complaintsurfaces threads that don't rank for the supplier's own name.
A clean page one of Google means nothing on its own. A supplier that's been around long enough to do volume should have some signal somewhere — and what kind of signal it is matters.
7. When you outsource the work
A B2B sourcing broker does this work on behalf of buyers. The vetting is the value: the broker has already done the registration check, validated distributor agreements, called references, watched suppliers through multiple order cycles, and pulled the ones that didn't pass. You see the result, not the process.
The trade-off: you give up direct supplier relationships in exchange for filtered ones. Worth it if your time is the constraint, less worth it if you're trying to build long-term direct relationships in a specific category.
Either way: don't skip the vetting. The cost of skipping it shows up later, and it's almost always more than the cost of doing it upfront.