Mina ✦
@minazone
Customer post
Bought a small X420 pack, changed the base URL, 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 prepaid 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
They cut their AI bills in half every month.
More than 200 builders and teams already route GPT-5.5 through X420: 1.8M+ requests processed, average AI spend cut by about 48%, and prepaid credits converted into direct margin for agencies, SaaS teams, and automations.
Partner surplus
How does X420 get cheaper GPT-5.5 tokens?
X420 buys unused AI capacity from verified partners. That capacity is pooled behind our OpenAI-compatible proxy, metered per request, then sold as prepaid credit with savings up to -50%.
Provider 1
Provider 2
Backup route
User
Your app
Start here
Pay once, receive 2× official-value GPT-5.5 credit.
Start small: a 10€ base pack gives 20€ of GPT-5.5 API credit after payment confirmation.
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
Replace the base URL. Keep your OpenAI-style code.
Use the same request format, streaming flow, and response handling. Change the base URL, add your X420 key, and spend from prepaid credit.
Before
const client = new OpenAI({
apiKey: process.env.OPENAI_API_KEY
});Change the base URL
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.
Usage scenarios
A fast, stable AI API, up to 50% cheaper.
+2,000 customers already use X420 credits. Teams use it to test GPT-5.5 faster, cap spend earlier, and keep the same SDK.
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 base URL 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, prepaid 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 prepaid 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
Last live check: 06:43:33 PMA compact live loop for the production path.
Dashboard, routing, auth, checkout, and API health rotate in one check cycle so you see the route that matters now.
0ms
API latency
0ms
Route switch
0%
Error rate
Your control room
See your credits, keys, usage, and top-ups in one place.
Create a key, set a limit, watch usage, and add more credit when you need it. No open-ended token bill.
Why it costs less
Discounted partner capacity, packaged as prepaid API credit.
X420.ai buys discounted unused partner capacity and packages it as prepaid GPT-5.5 API credit. You keep an OpenAI-style endpoint, capped keys, and a lower effective price when supply is available.