Claude Opus 4.8 · Sonnet 4.6 · Fable 5 — live now

Claude API access,
paid in crypto.

Premium Claude models through one OpenAI & Anthropic-compatible endpoint. Pay-as-you-go with USDT — no subscription, no KYC, no waiting.

Start free → Get your key View pricing
USDT / crypto payments OpenAI-compatible Works with Cursor, Cline, Claude Code
Why Sub2API

Built for developers who ship

Drop-in compatible, fast, and priced fairly. Point your existing tools at one URL and go.

⚡

Drop-in compatible

Works with the OpenAI and Anthropic SDKs. Change the base URL and key — your code stays the same.

🧠

Top Claude models

Opus 4.8, Opus 4.7/4.6, Sonnet 4.6, Fable 5 and Haiku — with extended thinking support.

₿

Pay with crypto

Top up your balance with USDT. No cards, no bank, no KYC. Credits never expire.

🛠️

Use any tool

Cursor, Cline, Claude Code, Roo, Continue, or raw curl — all supported out of the box.

📊

Live usage dashboard

Track every request, token and dollar in real time. Generate and rotate keys instantly.

🔒

Pay only for usage

Transparent per-token pricing. Your balance is debited exactly for what you use — nothing more.

Available models

One key. Every Claude model.

Call any model below through the same endpoint. Thinking variants available for deeper reasoning.

ModelFamilyBest forContext
claude-opus-4-8OpusHardest coding & agentic tasks200K
claude-opus-4-7OpusComplex reasoning200K
claude-opus-4-6OpusDeep reasoning, balanced200K
claude-sonnet-4-6SonnetFast everyday coding200K
claude-fable-5FableHigh-volume, cost-efficient200K
claude-haiku-4-5HaikuLightweight & instant200K
Get started in minutes

From signup to first call

1

Create account

Sign up free in seconds — just an email.

2

Top up in USDT

Add credits to your balance with crypto. Instant confirmation.

3

Generate a key

Create an API key from your dashboard.

4

Start building

Point your tool at our endpoint and ship.

curl — OpenAI compatible 
# Same as OpenAI — just swap the base URL & key
curl https://sub2api.31-7-61-37.sslip.io/v1/chat/completions \
  -H "Authorization: Bearer sk-your-key" \
  -H "Content-Type: application/json" \
  -d '{
    "model": "claude-opus-4-8",
    "messages": [{"role": "user", "content": "Hello!"}]
  }'
Pricing

Pay-as-you-go credits

Top up once, use across every model. Your balance is debited per token — no monthly lock-in.

Starter

Try it out and build your first integration.
$10 credit
  • All models included
  • Pay-per-token billing
  • 1 API key
  • Usage dashboard
Get started
Most popular

Pro

For daily coding with Cursor, Cline & Claude Code.
$30 credit
  • Everything in Starter
  • Higher rate limits
  • Up to 5 API keys
  • Priority routing
Top up & build

Scale

For teams and high-volume production apps.
$100+ credit
  • Everything in Pro
  • Volume bonus credits
  • Unlimited keys
  • Dedicated support
Contact & start

All top-ups are paid in USDT. Credits never expire. Exact per-token rates shown in your dashboard.

Ready to build with Claude?

Create your account, top up with crypto, and make your first call in under 5 minutes.

Get your API key →
FAQ

Questions, answered

Which tools and SDKs are supported?

Anything that speaks the OpenAI or Anthropic API — Cursor, Cline, Claude Code, Roo Code, Continue, LibreChat, or the official SDKs. Just set the base URL to our endpoint and use your key.

How does billing work?

You top up a credit balance with USDT. Each API request debits your balance based on the tokens used. There's no subscription — pay only for what you consume, and credits never expire.

Which crypto do you accept?

USDT and major cryptocurrencies. Payments are confirmed automatically and credited to your balance — no card or bank account needed, no KYC.

Do you support extended thinking?

Yes. Reasoning effort levels (low through xhigh) are supported on compatible models for deeper, more accurate responses on hard problems.

Is there a free trial?

Signing up is free and instant. You only pay when you top up credits to start making API calls.