Gemini API — AI Chat & Reasoning API | OpenAI-Compatible, Free Credits

Provider

Google

Pricing

~$0.004 per request (2 credits)

Speed

1–5 seconds

Output

text

Quick Start

Send a request to the Gemini API:

bash

curl -X POST https://apiin.one/api/v1/chat/completions \
  -H "Authorization: Bearer YOUR_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{
  "model": "gemini",
  "messages": [
    {
      "role": "user",
      "content": "Explain quantum computing in simple terms."
    }
  ],
  "temperature": 0.7,
  "max_tokens": 1024
}'

API Endpoint

POST/api/v1/chat/completionsGemini

Send a POST request with your API key to generate content using Gemini.

Headers

Header	类型	必填	描述
`Authorization`	string	必填	Bearer YOUR_API_KEY
`Content-Type`	string	必填	application/json

Body Parameters

参数	类型	必填	描述
`model`	string	必填	Model identifier: "gemini"
`messages`	array	必填	Array of message objects with role and content
`temperature`	number	可选	Sampling temperature (0-2) (默认值: 0.7)
`max_tokens`	number	可选	Maximum tokens in response (默认值: 4096)

Example Request

json

{
  "model": "gemini",
  "messages": [
    {
      "role": "user",
      "content": "Explain quantum computing in simple terms."
    }
  ],
  "temperature": 0.7,
  "max_tokens": 1024
}

Example Response

Successful completion response.

{
  "id": "chatcmpl_mno345",
  "model": "gemini",
  "choices": [
    {
      "message": {
        "role": "assistant",
        "content": "Quantum computing uses quantum bits (qubits) that can be both 0 and 1 simultaneously..."
      }
    }
  ],
  "usage": {
    "prompt_tokens": 12,
    "completion_tokens": 156,
    "total_tokens": 168
  },
  "credits_consumed": 2
}

Use Cases

✓Build AI-powered chatbots and customer support agents
✓Generate and summarize text content at scale
✓Create AI coding assistants and code generation tools
✓Power reasoning and analysis features in your application

API Tester

Test the Gemini API directly from your browser:

API 测试沙盒POST

基础 URL

端点

请求头

请求体

Error Codes

{
  "error": {
    "code": 400,
    "message": "Invalid parameters",
    "type": "invalid_request"
  }
}

Frequently Asked Questions

Is the Gemini API compatible with OpenAI's format?

Yes. API in One uses the standard OpenAI chat/completions format. You can switch from OpenAI to Gemini by changing the base URL and model name — no other code changes needed.