CheapestInference Examples

Code examples for CheapestInference — a flat-rate LLM inference API. No per-token billing.

What is CheapestInference?

One API for every open-source model (DeepSeek, Qwen, Llama, Kimi, Gemma). Fixed monthly price. Uses the standard OpenAI and Anthropic SDKs — just change the base URL. Pay with card or USDC on Base L2.

See current plans and pricing.

Quick start

Python

from openai import OpenAI

client = OpenAI(
    api_key="YOUR_API_KEY",
    base_url="https://api.cheapestinference.com/v1"
)

response = client.chat.completions.create(
    model="deepseek-chat",
    messages=[{"role": "user", "content": "Hello!"}]
)
print(response.choices[0].message.content)

Node.js

import OpenAI from "openai";

const client = new OpenAI({
  apiKey: "YOUR_API_KEY",
  baseURL: "https://api.cheapestinference.com/v1",
});

const response = await client.chat.completions.create({
  model: "deepseek-chat",
  messages: [{ role: "user", content: "Hello!" }],
});
console.log(response.choices[0].message.content);

cURL

curl https://api.cheapestinference.com/v1/chat/completions \
  -H "Authorization: Bearer YOUR_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{"model": "deepseek-chat", "messages": [{"role": "user", "content": "Hello!"}]}'

Examples

Example	Description
python/chat.py	Basic chat completion
python/streaming.py	Streaming responses with SSE
python/anthropic_sdk.py	Using the Anthropic SDK
python/tool_calling.py	Function/tool calling
node/chat.mjs	Basic chat completion (Node.js)
node/streaming.mjs	Streaming responses (Node.js)
agent-x402/autonomous_agent.py	Agent that self-subscribes via x402 + USDC

x402: Agents that pay for themselves

CheapestInference supports the x402 protocol. AI agents can discover the API, subscribe with USDC on Base, and start making requests — no human setup:

Agent → GET /v1/chat/completions (no key)
     ← 402 Payment Required + product catalog
Agent → POST /api/billing/checkout (selects plan, pays USDC)
     ← { apiKey: "sk-..." }
Agent → GET /v1/chat/completions (with key)
     ← 200 OK

See the full x402 example.

Supported endpoints

Endpoint	Description
POST /v1/chat/completions	OpenAI-compatible chat
POST /anthropic/v1/messages	Anthropic-compatible messages
POST /v1/embeddings	Text embeddings
GET /v1/models	List available models

Links

• Dashboard — Sign up, manage keys, view usage
• Docs — Full API reference
• Pricing — All models with per-token costs and request estimates