> ## Documentation Index
> Fetch the complete documentation index at: https://docs.chainstream.io/llms.txt
> Use this file to discover all available pages before exploring further.

# Endpoints & Authentication

> GraphQL endpoint URL, authentication, request format, and supported networks

## GraphQL Endpoint

All GraphQL queries are sent to a single endpoint:

```
https://graphql.chainstream.io/graphql
```

Both **POST** and **GET** methods are supported.

| Method | Content-Type                | Use Case                                                             |
| :----- | :-------------------------- | :------------------------------------------------------------------- |
| `POST` | `application/json`          | Recommended for all queries — supports variables and complex queries |
| `GET`  | Query string (`?query=...`) | Simple queries, browser testing, caching-friendly                    |

<Tip>
  Use **POST** for production workloads. GET requests encode the query in the URL, which has length limits and makes complex queries unwieldy.
</Tip>

***

## Authentication

Authenticate by passing your API Key in the `X-API-KEY` header. This is the same API Key used for the REST Data API — no separate credentials needed.

```
X-API-KEY: your_api_key
```

<Note>
  Get your API Key from [ChainStream Dashboard](https://www.chainstream.io/dashboard) → **Applications** → **Create New App**. The key starts with `cs_live_...`.
</Note>

### Required Headers

| Header         | Value              | Required   |
| :------------- | :----------------- | :--------- |
| `Content-Type` | `application/json` | Yes (POST) |
| `X-API-KEY`    | `cs_live_...`      | Yes        |

***

## Request Format

A GraphQL request body is a JSON object with two fields:

| Field       | Type     | Description                                                       |
| :---------- | :------- | :---------------------------------------------------------------- |
| `query`     | `string` | The GraphQL query or mutation string                              |
| `variables` | `object` | Optional variables referenced in the query via `$variable` syntax |

### POST Example

<Tabs>
  <Tab title="cURL">
    ```bash theme={null}
    curl -X POST "https://graphql.chainstream.io/graphql" \
      -H "Content-Type: application/json" \
      -H "X-API-KEY: your_api_key" \
      -d '{
        "query": "{ Solana { DEXTrades(limit: {count: 5}, orderBy: {descending: Block_Time}) { Block { Time } Trade { Buy { Currency { MintAddress } Amount } } } } }"
      }'
    ```
  </Tab>

  <Tab title="cURL (query file)">
    For complex queries, save the query to a file and reference it:

    ```bash theme={null}
    # Save query to file
    cat > query.graphql << 'EOF'
    {
      Solana {
        DEXTrades(limit: {count: 5}, orderBy: {descending: Block_Time}) {
          Block { Time }
          Trade {
            Buy {
              Currency { MintAddress }
              Amount
            }
          }
        }
      }
    }
    EOF

    # Send request
    curl -X POST "https://graphql.chainstream.io/graphql" \
      -H "Content-Type: application/json" \
      -H "X-API-KEY: your_api_key" \
      -d "{\"query\": \"$(cat query.graphql | tr '\n' ' ')\"}"
    ```
  </Tab>

  <Tab title="JavaScript (fetch)">
    ```javascript theme={null}
    const response = await fetch("https://graphql.chainstream.io/graphql", {
      method: "POST",
      headers: {
        "Content-Type": "application/json",
        "X-API-KEY": "your_api_key",
      },
      body: JSON.stringify({
        query: `{
          Solana {
            DEXTrades(limit: {count: 5}, orderBy: {descending: Block_Time}) {
              Block { Time }
              Trade { Buy { Currency { MintAddress } Amount } }
            }
          }
        }`,
      }),
    });

    const { data, extensions } = await response.json();
    console.log(data.Solana.DEXTrades);
    ```
  </Tab>

  <Tab title="Python (requests)">
    ```python theme={null}
    import requests

    resp = requests.post(
        "https://graphql.chainstream.io/graphql",
        headers={
            "Content-Type": "application/json",
            "X-API-KEY": "your_api_key",
        },
        json={
            "query": """{
                Solana {
                    DEXTrades(limit: {count: 5}, orderBy: {descending: Block_Time}) {
                        Block { Time }
                        Trade { Buy { Currency { MintAddress } Amount } }
                    }
                }
            }""",
        },
    )

    data = resp.json()
    print(data["data"]["Solana"]["DEXTrades"])
    ```
  </Tab>
</Tabs>

### GET Example

```bash theme={null}
curl -G "https://graphql.chainstream.io/graphql" \
  -H "X-API-KEY: your_api_key" \
  --data-urlencode 'query={ Solana { DEXTrades(limit: {count: 5}, orderBy: {descending: Block_Time}) { Block { Time } } } }'
```

***

## Supported Networks

Wrap Cube queries in the appropriate **Chain Group** to select the network:

| Chain Group         | Blockchain      | Chain ID |
| :------------------ | :-------------- | :------- |
| `Solana`            | Solana          | —        |
| `EVM(network: eth)` | Ethereum        | 1        |
| `EVM(network: bsc)` | BNB Chain (BSC) | 56       |

```graphql theme={null}
# Solana
{ Solana { DEXTrades(limit: {count: 5}) { ... } } }

# Ethereum
{ EVM(network: eth) { DEXTrades(limit: {count: 5}) { ... } } }

# BSC
{ EVM(network: bsc) { DEXTrades(limit: {count: 5}) { ... } } }
```

***

## Response Format

All responses are JSON with the following structure:

```json theme={null}
{
  "data": {
    "Solana": {
      "DEXTrades": [
        { "Block": { "Time": "2025-03-27T10:15:30Z" }, "..." : "..." }
      ]
    }
  },
  "extensions": {
    "credits": {
      "total": 50,
      "cubes": [
        { "cube": "DEXTrades", "credits": 50, "row_count": 5 }
      ]
    }
  }
}
```

| Field                      | Description                                                       |
| :------------------------- | :---------------------------------------------------------------- |
| `data`                     | The query result — matches the shape of your query                |
| `errors`                   | Present only when there are validation or execution errors        |
| `extensions.credits.total` | Total credit units consumed by this query                         |
| `extensions.credits.cubes` | Per-Cube breakdown: Cube name, credits charged, and rows returned |

<Note>
  The `extensions.credits` field is included when credits are consumed. See [Billing & Credits](/en/graphql/billing/graphql-billing) for details on how credits are calculated.
</Note>

### Error Response

When a query is malformed or fails, the response includes an `errors` array:

```json theme={null}
{
  "data": null,
  "errors": [
    {
      "message": "Unknown field 'InvalidField' on type 'DEXTrades'",
      "locations": [{ "line": 3, "column": 5 }]
    }
  ]
}
```

<Tip>
  Use the [GraphQL IDE](https://ide.chainstream.io) to validate queries interactively before integrating them into your application. The IDE provides auto-complete and inline error highlighting.
</Tip>

***

## Next Steps

<CardGroup cols={2}>
  <Card title="Run Your First Query" icon="play" href="/en/graphql/getting-started/first-query">
    Follow the step-by-step tutorial to run a real query from the IDE or cURL.
  </Card>

  <Card title="Explore the Schema" icon="diagram-project" href="/en/graphql/schema/schema-overview">
    Dive into the 25 Cubes, field types, filtering operators, and aggregation functions.
  </Card>
</CardGroup>