How do I use DeepSeek V4 Pro through YepAPI?

Sign up for a free API key, then send requests to the /v1/ai/chat endpoint.

DeepSeekText Generation/v1/ai/chat

DeepSeek V4 Pro

Access DeepSeek V4 Pro through one API key. Frontier reasoning at a fraction of flagship pricing.

DeepSeek's V4-generation flagship: 1.6T-parameter MoE with 49B activated, 1M token context, built for advanced reasoning, coding, and agentic workflows.

Full Docs Get API Key — Free $5 Credit

No credit card required. Takes 30 seconds.

2,400+

Developers

1.2M+

API calls served

100+

Endpoints

$0.01

Per call

Yep, that's it.

Try it live

Send a message and see DeepSeek V4 Pro respond in real time.

POST/v1/ai/chatdeepseek/deepseek-v4-pro

Message *

Max Tokens

Maximum tokens in the response.

Stream

Real-time tokens

Hit "Send Request" to see the response

Context Window

1.0M tokens

Max Output

384K tokens

Input Price

$0.61 / 1M tokens

Output Price

$1.22 / 1M tokens

Strengths

✓1M token context

✓Advanced reasoning

✓Strong coding

✓Agentic workflows

Quick start

Copy this snippet and start making calls with DeepSeek V4 Pro.

const res = await fetch('https://api.yepapi.com/v1/ai/chat', {
  method: 'POST',
  headers: {
    'x-api-key': 'YOUR_API_KEY',
    'Content-Type': 'application/json',
  },
  body: JSON.stringify({
    "model": "deepseek/deepseek-v4-pro",
    "messages": [
      {
        "role": "user",
        "content": "Explain API gateways in 2 sentences."
      }
    ],
    "maxTokens": 256
  }),
});
const { data } = await res.json();
console.log(data.message.content);

Why use DeepSeek V4 Pro through YepAPI?

✓One API key for all models — no separate accounts

✓OpenAI SDK compatible — just change the base URL

✓No monthly minimums — pay per token

✓Switch models with one line of code

✓Full provider passthrough — citations, search results, and all extras included

✓Streaming and non-streaming support on every model

✓Works with Cursor, Claude, LangChain, and any LLM tool

✓Unified billing across all providers

What developers say

“Switched from SerpAPI and cut our SERP costs by 80%. Same data quality, way simpler billing.”
Marcus T.
SEO Platform Founder

“One API key for AI models, SERP data, and web scraping. Saved us from managing 4 separate providers.”
Priya S.
Full-Stack Developer

“The $5 free credit let us prototype our entire rank tracking feature before committing. No other API does that.”
Jake R.
Indie Hacker

Frequently asked questions

DeepSeek's V4-generation flagship: 1.6T-parameter MoE with 49B activated, 1M token context, built for advanced reasoning, coding, and agentic workflows.

Input tokens cost $0.61 per 1M tokens and output tokens cost $1.22 per 1M tokens through YepAPI. No monthly minimums — you only pay for what you use.

DeepSeek V4 Pro supports a 1.0M token context window with up to 384K output tokens per request.