Aphelion Documentation

Why Aphelion?

Building AI agents that interact with external APIs is complex. Aphelion solves this:

STELLA Protocol

STELLA (Standard Tool Execution Layer for LLM Agents) is Aphelion's protocol that normalizes every API into a consistent interface. Your agent learns one pattern, accesses 30M+ APIs.

Installation

Install the Aphelion SDK for your preferred language:

pip install aphelion

npm install aphelion

Core Concepts

Quick Example

Execute a Stripe tool in just a few lines:

from aphelion import Aphelion

client = Aphelion(
    api_key="ap_live_...",
    agent="my-first-agent"
)

# Execute a tool
result = client.execute(
    "stripe.customers.create",
    {
        "email": "jane@example.com",
        "name": "Jane Doe"
    }
)

print(result)
# {"id": "cus_abc123", "email": "jane@example.com", ...}

API Base URL

Authentication

Aphelion uses Bearer token authentication with API keys:

curl https://api.aphl.ai/v1/execute \
  -H "Authorization: Bearer ap_live_..." \
  -H "Content-Type: application/json"

Available Providers

200+ pre-built tools across categories: