Now accepting sellers

The API key marketplace

Sell spare API capacity and earn per request. Or access 160+ APIs with a single base URL change — pay only for what you use.

terminallive
0+
Providers
0+
Keys listed
0M+
Requests routed
<50ms
Routing overhead
0%
Uptime
AES-256 encrypted
Keys never stored in plaintext
Automatic failover
Retries on another key if one fails
Open protocols
MPP + x402, no vendor lock-in
Instant payouts
USDC, Stripe, or Lightning
How it works

Two sides, one marketplace

Seller
1
Add your API key
Paste your key, set a floor price, and choose which routes to expose.
2
We verify liveness
A lightweight health check confirms your key works. Takes under 2 seconds.
3
Start earning
Buyers pay per request via MPP. You earn automatically — payouts in USDC, Stripe, Lightning, or wire.
Buyer
1
Replace the base URL
Point your client to openai.cn2.ai instead of api.openai.com.
2
Pay per request
MPP handles payment in the same HTTP request. No API key management, no accounts required.
3
Automatic failover
If a key fails, cn2 retries on another seller's key. You never see the error.
Request flow

One request, paid and routed

1
Request arrives
Buyer sends request to openai.cn2.ai
2
Payment required
HTTP 402
cn2 responds with HTTP 402 and an MPP payment challenge
3
Pay inline
mppx SDK
Client SDK attaches payment credential to the retry request
4
Route to key
cn2 selects the cheapest eligible key and proxies to the upstream provider
5
Response + receipt
200 OK
Upstream response returned to buyer with a payment receipt header
Pricing

Start free, scale as you earn

Free
$0/month
  • Unlimited key listings
  • 10% platform fee
  • Standard pool only
  • Webhook notifications
Typical: $50–200/mo per key at 10% fee
Premium
$9/month
  • Everything in Free
  • 8% platform fee
  • Premium pool access
Typical: $55–220/mo per key at 8% fee
Most popularPro
$29/month
  • Everything in Premium
  • 5% platform fee
  • Priority routing
  • Advanced analytics
Typical: $60–250/mo per key at 5% fee
FAQ

Common questions

It depends on the provider, traffic, and your pricing. Sellers with popular providers like OpenAI or Anthropic typically earn $50–500/month per key. You set your own floor price and cn2.ai dynamically adjusts based on supply and demand.

Yes. Keys are encrypted with AES-256-GCM at the moment you submit them. They are never stored in plaintext. Decryption happens only at request time inside an isolated Cloudflare Worker — the web app never sees the raw key.

You set requests-per-minute, requests-per-hour, and total budget limits when listing your key. cn2.ai enforces these limits at the edge with KV-based rate counters. You can also pause your key at any time.

Each API route has a per-request price. When you send a request, cn2.ai responds with HTTP 402 showing the exact price before you pay. The mppx SDK handles payment automatically — you just see the API response.

No. The MPP protocol handles payment inline with each request. You can optionally create an account for request history, spend tracking, and dispute filing.

cn2.ai automatically retries on another seller's key. You only see the final successful response. If all available keys fail, you get a 502 — but with multiple sellers per provider, this is rare.

No upfront cost. No lock-in.

List a key and earn from your first buyer request. Or browse the marketplace to find cheaper API access. Start in under a minute.