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FragmentAPI/docs/getting-started/configuration.md
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# Library and Configuration
Main entry point of the library is `FragmentClient`.
```python
FragmentClient(
seed: str,
api_key: str,
cookies: dict[str, Any] | str,
wallet_version: str = "V5R1",
api_provider: str = "tonapi",
timeout: float = 30.0,
)
```
## Parameters
- `seed`: wallet mnemonic (**12 or 24 words**)
- `api_key`: API key — from [tonconsole.com](https://tonconsole.com) (tonapi) or [@toncenter](https://t.me/toncenter)
- `cookies`: Fragment cookies as a dictionary or JSON string
- `wallet_version`: `"V4R2"`, `"V5R1"`, `"HighloadV2"`, or `"HighloadV3R1"`
- `api_provider`: blockchain API provider — `"tonapi"` (default) or `"toncenter"`
- `timeout`: request timeout in seconds
**If `api_key` or cookies are missing, initialization fails immediately.**
## Required cookies
- `stel_ssid`
- `stel_dt`
- `stel_token`
- `stel_ton_token`
## Minimal initialization pattern
```python
from pyfragment import FragmentClient
async with FragmentClient(
seed="word1 word2 ... word24",
api_key="YOUR_API_KEY",
cookies={
"stel_ssid": "...",
"stel_dt": "...",
"stel_token": "...",
"stel_ton_token": "...",
},
) as client:
wallet = await client.get_wallet()
```
## Switching API provider
By default, the library uses [tonconsole.com](https://tonconsole.com) (tonapi). To use [toncenter](https://t.me/toncenter) instead, pass `api_provider="toncenter"`:
```python
async with FragmentClient(
seed="...",
api_key="YOUR_TONCENTER_API_KEY",
cookies={...},
api_provider="toncenter",
) as client:
...
```
Both providers work identically — the correct `tonutils` client is selected automatically based on `api_provider`.
## Validation behavior
At initialization, library validates:
- seed format,
- cookie shape and required keys,
- supported wallet version,
- supported API provider,
- parseability of cookie JSON strings.
Constructor-level issues are raised as `ConfigurationError` or `CookieError`.