> For the complete documentation index, see [llms.txt](https://tokenscript.gitbook.io/token-negotiator/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://tokenscript.gitbook.io/token-negotiator/learn/issuer-configurations/issuer-configuration-evm.md).

# Issuer Configuration EVM

Parameters to create a configuration for Ethereum fungible or non-fungible token collections. 

| Parameter    | Type              | details                                                                                        | Options           |
| ------------ | ----------------- | ---------------------------------------------------------------------------------------------- | ----------------- |
| onChain      | boolean           | defines if the collection is on or off chain. Set this value to true.                          | true \| false     |
| collectionID | string            | a unique string identifier for your usage (this will be the name space your tokens are kept)   | string            |
| blockchain   | string            | defines the blockchain (refer to supported Chains page)                                        | string            |
| chain        | string            | the network of the blockchain (refer to supported Chains page)                                 | string            |
| contract     | string            | smart contract address of the collection                                                       | string            |
| fungible     | boolean           | fungible or non fungible token collection                                                      | true \| false     |
| openSeaSlug  | string (optional) | An optional additional field which helps identify token collections featured on OpenSea        | string (optional) |
| abi          | string (optional) | If working with Smart Contracts this field can be utilised to add a reference to your abi file | string (optional) |

Non Fungible Token example issuer configuration:

```
const onChainNonFungibleIssuer = {
	onChain: true,
	collectionID: "expansion-punks",
	blockchain: "evm",
	chain: "eth",
	fungible: false,
	contract: "0x0d0167a823c6619d430b1a96ad85b888bcf97c37",
	openSeaSlug: "expansion-punks"
};
```

Fungible Token example issuer configuration:

```
const onChainFungibleIssuer = {
	onChain: true,
	collectionID: "USX",
	blockchain: "evm",
	chain: "matic",
	fungible: true,
	contract: "0x107065a122f92636a1358a70a0efe0f1a080a7e5"
};
```

**Tip 💡**

To verify Smart Contract information use EVM Blockchain Explorer websites which include:

* <https://etherscan.io>
* <https://bscscan.com>
* <https://polygonscan.com>


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