# Subgraphs

## Authentication

### The Graph Network <a href="#the-graph-network" id="the-graph-network"></a>

The Graph Protocol is a decentralised network that serves API requests through its distributed network of indexers. Graph queries are constructed using GraphQL, which allows a high degree of flexibility for the caller. This combination ensures that responses are accurate and fast, and the requests are highly customizable.

### Billing <a href="#billing" id="billing"></a>

In order to obtain your API key, you must first connect your wallet to the Graph and charge your balance with GRT tokens. This can also be accomplished by paying with a card at [https://thegraph.com/studio/billing/(opens in a new tab)](https://thegraph.com/studio/billing/). To avoid exposure to market fluctuations, you have the option to peg your tokens to a stablecoin.

### Pricing Structure <a href="#pricing-structure" id="pricing-structure"></a>

You might consider using Arbitrum for payments, as the fees are significantly cheaper. The Graph charges a variable rate per request, which can be adjusted according to your needs. If you require higher quality responses, you can choose to pay a higher rate.

### &#x20;<a href="#getting-your-api-key" id="getting-your-api-key"></a>