Mina ✦
@minazone
Customer post
Bought a small X420 pack, changed the endpoint, and our GPT-5.5 test route worked without touching the app logic.
2h·x.com
194852222,1 k
Your favorite models,100% the same AI50% of the priceOne API at half the price
Buy GPT-5.5 credit from €10, then use a capped X420 key with your current OpenAI SDK.
CHAT GPT-5.5Watch the explainer video.
Our clients
200+ teams. 1.8B tokens saved every month.
More than 200 builders and teams already use X420: 1.8B tokens saved per month on average by SaaS teams. Visible spend before it becomes a bill.
How is it possible?
"Half price" sounds suspicious. Here is why it is not.
AI providers sell capacity in bulk. Some buyers do not use all of it. X420 buys unused capacity at a discount, pools it behind one OpenAI-compatible endpoint, and passes the discount to you. No degraded model, no hidden quota, no surprise fine print.
Provider 1
Provider 2
Backup route
User
Your app
Start here
Pay €10. Get €20. That is the pricing page.
Choose any amount from €10. X420 doubles it in GPT-5.5 API credit when discounted partner capacity is available.
Coming soon
Claude Pro offer
A discounted Claude Pro plan is being prepared for X420 customers.
€50
instead of €90
- ✓ Claude Pro access planned
- ✓ Target offer: €50 instead of €90
- ✓ Checkout opens when available
Drop-in SDK switch
Your migration is one line long.
Same requests. Same streaming. Same responses. Your code barely notices the endpoint changed. Your invoice does.
Before
const client = new OpenAI({
apiKey: process.env.OPENAI_API_KEY
});That is it
After
const client = new OpenAI({
apiKey: process.env.X420_API_KEY,
baseURL: "https://api.x420.ai/v1"
});Use an enabled model such as openai/gpt-5.5. Your app only stores the X420 key.
Developer verdict
Boring migrations. Exciting invoices.
+200 devs use X420 credits. They keep the same OpenAI-style setup, add a capped X420 key, and spend less on GPT-5.5 tests.
devin
@shipwithdevin
Customer post
The useful part is the spending cap. I can test GPT-5.5 features with a fixed budget instead of waiting for an invoice.
4h·x.com
33961,2 k48,1 k
Leah from infra
@leah_ops
Customer post
Swapped the endpoint to X420 and kept the same SDK. Capped keys made our first live route much easier to approve.
6h·x.com
113128415,4 k
Kaito
@kaitocodes
Customer post
For side projects, credit is cleaner. Buy a pack, set a key limit, and stop before the budget gets weird.
8h·x.com
247381138,6 k
sara.builds
@sara_builds
Customer post
Our support bot test finally had a clear ceiling: one pack, one capped key, one endpoint change.
11h·x.com
82623311,9 k
Noah Chen
@noahchen_ai
Customer post
If you already use an OpenAI-style SDK, X420 feels like a checkout plus one config change.
13h·x.com
144539018,7 k
Live network status
checking liveLast live check
07:01:49 PM
We watch the route so you do not have to. API health, routing, auth and checkout update live. If something slows down, you see it here before production feels it.
0ms
API latency
0ms
Route switch
0%
Error rate
Your control room
One screen. Zero surprises.
Credits, keys, usage, and top-ups stay visible in real time. Create a key in two clicks, watch it spend, and refill only when you decide.
Why it costs less
Discounted partner capacity, packaged as API credit.
X420 buys unused partner capacity at a discount, pools it behind one OpenAI-compatible endpoint, and shows the real price before you pay.