Authentication

All API requests require an API key. Include your key in the X-API-Key header with every request.

Getting your API key

Create an account (free, no credit card required)
Verify your email
Go to your Dashboard and navigate to API Keys
Click Create New Key and give it a name
Copy the key immediately — it won’t be shown again

Using your API key

Include the key in the X-API-Key header:

curl -H "X-API-Key: nb_your_api_key_here" \
  "https://api.polyhistorical.com/v1/markets?coin=BTC&limit=5"

import requests

headers = {"X-API-Key": "nb_your_api_key_here"}
response = requests.get(
    "https://api.polyhistorical.com/v1/markets",
    params={"coin": "BTC", "limit": 5},
    headers=headers
)
print(response.json())

const headers = { "X-API-Key": "nb_your_api_key_here" };

const response = await fetch(
  "https://api.polyhistorical.com/v1/markets?coin=BTC&limit=5",
  { headers }
);
const data = await response.json();
console.log(data);

API key limits by plan

Plan	Max API Keys
Starter (Free)	1
Pro	3
Enterprise	33

Security best practices

Never expose your API key in client-side code, public repositories, or browser requests. Always call the API from your backend server.

Store keys in environment variables, not in code
Use different keys for development and production
Rotate keys periodically
Revoke unused keys from your dashboard

Introduction Quickstart

Getting Started

API Reference

Guides

Authentication

Authentication

Getting your API key

Using your API key

API key limits by plan

Security best practices

​Authentication

​Getting your API key

​Using your API key

​API key limits by plan

​Security best practices

Authentication

Getting your API key

Using your API key

API key limits by plan

Security best practices