Route difference
The first layer is not brand size. It is user market, protocol entry, model-family coverage, and real call stability.
- Amazon: global route, 5 Models
- StepFun AI: China route, 1 Models
Provider comparison
Amazon vs StepFun AI
Start with the provider route, compare model coverage, then use read-only key checking to verify what is actually callable.
Region
global route / China route
global / china
Models
5 / 1
56 providers indexed
Amazon
Nova 2 Lite · Nova Lite 1.0 · Nova Micro 1.0
Sample models
StepFun AI
Step 3.5 Flash
Sample models
Left provider
Amazon
amazon
Regionglobal
Models5
Sample models
Nova 2 Lite
Nova Lite 1.0
Nova Micro 1.0
Right provider
StepFun AI
stepfun
Regionchina
Models1
Sample models
Step 3.5 Flash
Comparison summary
How to judge first
Amazon and StepFun AI are cross-region routes. Start with the user's market, then verify whether the key can call reliably across regions.
Amazon has broader catalog coverage, but broader coverage does not mean every key can call every model.
In production, one key should reveal provider identity, callable models, balance or quota signals, limits, and risk notes.
Key checking value
A key may expose only part of the models, interfaces, or regions, so the final call must rely on detection results, not the catalog alone.
- Amazon: Nova 2 Lite · Nova Lite 1.0 · Nova Micro 1.0
- StepFun AI: Step 3.5 Flash
Procurement and distribution
For procurement, agency, and marketplace listing, provider comparison must end in supply stability, pricing, monitoring, and model updates.
- Do not treat catalog coverage as real sellability.
- Key checking and continuous monitoring are the final commercial loop.