# Calling APIs

{% hint style="info" %}
**Note** : Before the assets are transferred across the chain, The Rangers Protocol team would need to review these assets. If the transferred assets are FT, the quantity approved in the contract address must be larger than or equal to the quantity of cross-chain FTs.
{% endhint %}

The cross-chain smart contract of Rangers Protocol can support cross-chain operations under [Rangers Bridge](https://bridge.rangersprotocol.com/). Additionally, any person or organization can invoke an interface to perform cross-chain operations as long as it meets the cross-chain specification:

## getcrosslist 

Get all cross-chain pairs

{% tabs %}
{% tab title="Input Parameters" %}

```
{"type": "erc20"} or {"type": "erc721"}
```

{% endtab %}

{% tab title="Return" %}

```
[{
    "Name": "RPG",
    "Nodes": [{
            "FromChain": "ETH",
            "FromContract": "0x0a98D1304c2DAD3c85EA06588996CeBB63Efb403",
            "ToChain": "BSC",
            "ToContract":
                "0x440dAcfd04e058c730C4B0fBc63BDDB0CA6e4F81"
        },
        {
            "FromChain": "ETH",
            "FromContract": "0x0a98D1304c2DAD3c85EA06588996CeBB63Efb403",
            "ToChain": "Rangers",
            "ToContract": "0x71d9CFd1b7AdB1E8eb4c193CE6FFbe19B4aeE0dB"
        },
        {
            "FromC
            hain": "BSC",
            "FromContract": "0x440dAcfd04e058c730C4B0fBc63BDDB0CA6e4F81",
            "ToChain": "ETH",
            "ToContract": "0x0a98D1304c2DAD3c85EA06588996CeBB63Efb403"
        },
        {
            "FromChain": "BSC",
            "FromContract":
                "0x440dAcfd04e058c730C4B0fBc63BDDB0CA6e4F81",
            "ToChain": "Rangers",
            "ToContract": "0x71d9CFd1b7AdB1E8eb4c193CE6FFbe19B4aeE0dB"
        },
        {
            "FromChain": "Rangers",
            "FromContract":
                "0x71d9CFd1b7AdB1E8eb4c193CE6FFbe19B4aeE0dB",
            "ToChain": "ETH",
            "ToContract": "0x0a98D1304c2DAD3c85EA06588996CeBB63Efb403"
        },
        {
            "FromChain": "Rangers",
            "FromContract": "0x71d9CFd1b7AdB1E8eb4c193CE6FFbe19B4aeE0dB",
            "ToChain": "BSC"
            ,
            "ToContract": "0x440dAcfd04e058c730C4B0fBc63BDDB0CA6e4F81"
        }
    ]
},
    {
        "Name": "MIX",
        "Nodes": [{
            "FromChain": "ETH",
            "FromContract": "0xa0087DE524CC951c80e2eb474C260C66Bba19ebE",
            "ToChain": "BSC",
            "ToContract": "0xB91c861Fb61
            f9bD8Da3eBAC25ed391e5da7Bb4Ad"
        },
            {
                "FromChain": "ETH",
                "FromContract": "0xa0087DE524CC951c80e2eb474C260C66Bba19ebE",
                "ToChain": "Rangers",
                "ToContract":
                    "0xB895607BEe24aA62ca090ce0445A1893e70ee5a0"
            },
            {
                "FromChain": "BSC",
                "FromContract": "0xB91c861Fb61f9bD8Da3eBAC25ed391e5da7Bb4Ad",
                "ToChain": "Rangers",
                "ToContract": "0xB895607BEe24aA62ca090ce0445A1893e70ee5a0"
            },
            {
                "FromC
                hain": "BSC",
                "FromContract": "0xB91c861Fb61f9bD8Da3eBAC25ed391e5da7Bb4Ad",
                "ToChain": "ETH",
                "ToContract": "0xa0087DE524CC951c80e2eb474C260C66Bba19ebE"
            },
            {
                "FromChain": "Rangers",
                "FromContract":
                    "0xB895607BEe24aA62ca090ce0445A1893e70ee5a0",
                "ToChain": "ETH",
                "ToContract": "0xa0087DE524CC951c80e2eb474C260C66Bba19ebE"
            },
            {
                "FromChain": "Rangers",
                "FromContract": "0xB895607BEe24aA62ca090ce0445A1893e70ee5a0",
                "ToChain": "BSC"
                ,
                "ToContract": "0xB91c861Fb61f9bD8Da3eBAC25ed391e5da7Bb4Ad"
            }
        ]
    },
    {
        "Name": "USDT",
        "Nodes": [{
            "FromChain": "BSC",
            "FromContract": "0xef59010466e924E23ac7a76296fF3b8Ba2FaF0d3",
            "ToChain": "Rangers",
            "ToContract": "0x0F3A62dB02F743b549053cc8d538C65aB01E3618"
        },
            {
                "FromChain": "Rangers",
                "FromContract": "0x0F3A62dB02F743b549053cc8d538C65aB01E3618",
                "ToChain": "BSC",
                "ToContract": "0xef59010466e924E23ac7a76296fF3b8Ba2FaF0d3"
            }
        ]
    },
    {
        "Name": "ETH",
        "Nodes": [{
            "FromChain": "BSC",
            "FromContract": "0xc2B8d0a60D2158fa09869571B52C8C96cE1F8537",
            "ToChain": "Rangers",
            "ToContract":
                "0x049891B7e5a1E886aBe5cA71a40A79fBBd2dcC87"
        },
            {
                "FromChain": "Rangers",
                "FromContract": "0x049891B7e5a1E886aBe5cA71a40A79fBBd2dcC87",
                "ToChain": "BSC",
                "ToContract":
                    "0xc2B8d0a60D2158fa09869571B52C8C96cE1F8537"
            }
        ]
    }
]
```

{% endtab %}
{% endtabs %}

## getcrosscontract

Get the cross-chain contract address

{% tabs %}
{% tab title="Input Parameters" %}
/
{% endtab %}

{% tab title="Return" %}

```

{
    "BSC": "0x861C24230140194F43Df1c2a164F1C4071487FBA",
    "ETH": "0xc7f7BD8E994feD967ED995Ae27D1b45c93c31a80",
    "Rangers": "0x9c1CbFE5328DFB1733d59a7652D0A49228c7E12C"
}

```

{% endtab %}
{% endtabs %}

## getpoolsize 

Get cross-chain pool size

{% tabs %}
{% tab title="Input Parameters" %}

```
{
    "Chain": "ETH",
    "FromContract":"0x0a98D1304c2DAD3c85EA06588996CeBB63Efb403",
    "ToChain": "BSC",
    "ToContract":"0x440dAcfd04e058c730C4B0fBc63BDDB0CA6e4F81"
}

```

{% endtab %}

{% tab title="Return" %}

```
{
    "Chain": "ETH",
    "FromContract":
    "0x0a98D1304c2DAD3c85EA06588996CeBB63Efb403",
        "ToChain": "BSC",
    "ToContract": "0x440dAcfd04e058c730C4B0fBc63BDDB0CA6e4F81",
    "PoolSize": "1008073432698151994932744",
    "Decimal": "18"
}

```

{% endtab %}
{% endtabs %}

## getfee 

Get the cross-chain gas fee, and then when initiating a cross-chain transaction, the amount of coins to be traded needs to be filled in.

{% tabs %}
{% tab title="Input Parameters" %}

```
{
    "Chain":"Rangers",
    "FromContract":"0x71d9CFd1b7AdB1E8eb4c193CE6FFbe19B4aeE0dB",
    "ToChain":"BSC",
    "ToContract":"0xc2098a8938119A52B1F7661893c0153A6CB116d5"
}

```

{% endtab %}

{% tab title="Second Tab" %}

```
{
    "FromContract": "0x71d9CFd1b7AdB1E8eb4c193CE6FFbe19B4aeE0dB",
    "ToContract": "0xc2098a8938119A52B1F7661893c0153A6CB116d5",
    "Fee": "93160766660714182",
    "Decimal": "18"
}

```

{% endtab %}
{% endtabs %}

## getbridgeinfo 

Get cross-chain record

{% tabs %}
{% tab title="Input Parameters" %}

```
{
    "Chain":"RPG",
    "Type":"erc20",
    "Addr":"0xf44ce46191380afb962460d3db9417d7d70e0dd6"
}

```

{% endtab %}

{% tab title="Second Tab" %}

```
[{
    "F_Chain": "Rangers",
    "F_Contract": "0x71d9CFd1b7AdB1E8eb4c193CE6FFbe19B4aeE0dB",
    "F_From": "0xF44Ce46191380AFB962460D3db9417d7d70E0Dd6",
    "F_To": "0xF44Ce46191380AFB96
    2460D3db9417d7d70E0Dd6",
    "F_AmountOrNftid": "1035000000000000000000",
    "F_Hash":
        "0x4d3603c2ee7cdacf883b477f0c2c26e1d8dd965d3768711cdc686125569f9e76",
    "URI": "",
    "T_Chain": "BSC",
    "T_Contract":
        "0xc2098a8938119A52B1F7661893c0153A6CB116d5",
    "T_Status": "success",
    "T_Hash":
        "0x01c21034a7c8d4a98ec98f446656c9e646868ef7fd5d6d55d7d91bac8cbbf2cb",
    "Tm": "1640678800",
    "Dec": "18",
    "Fee": "0.022350586154170202",
    "TokenName": "RPG"
}]

```

{% endtab %}
{% endtabs %}

## getcrossstatus 

Get cross-chain status

{% tabs %}
{% tab title="Input Parameters" %}

```
{
    "Hash":"0x7993c254a4fcbc3c7823cbb97e0fdea319c9ff0793d9661894942f84a66f1457"
}

```

{% endtab %}

{% tab title="Second Tab" %}

```
{
    "Hash": "0x7993c254a4fcbc3c7823cbb97e0fdea319c9ff0793d9661894942f84a66f1457",
    "THash": "0xd2422805686cc9da4815e98128a162951923e329765a8d634e65c2999fa74c82",
    "Status": "success"
}

```

{% endtab %}
{% endtabs %}