Open DotSwap

Removing Liquidity

In this guide, we will use an example of DotSwap process to show how to remove liquidity from a pool, which includes:

  • Removing

    • Pre-remove Request

    • Get Unsigned Remove PSBT

    • Send Signed Remove PSBT

  • Get Estimated Remove Amount

The removing interface for Runes/BRC20/ARC20 is the same, differentiated by coin_type_*.

Pre-remove liquidity

post
Header parameters
AuthorizationstringOptional

token

User-IdstringOptional
Body
tick1stringRequired
tick2stringRequired
coin_type_1stringRequired
coin_type_2stringRequired
percentstringRequired
payer_btc_addrstringRequired
payer_ord_addrstringRequired
payer_pub_keystringRequired
slipperstringRequired
fee_ratestringRequired
Responses
200
Success
application/json
post
POST /brc20swap/v2/pre_remove_liquid HTTP/1.1
Host: 
Content-Type: application/json
Accept: */*
Content-Length: 196

{
  "tick1": "text",
  "tick2": "text",
  "coin_type_1": "text",
  "coin_type_2": "text",
  "percent": "text",
  "payer_btc_addr": "text",
  "payer_ord_addr": "text",
  "payer_pub_key": "text",
  "slipper": "text",
  "fee_rate": "text"
}
{
  "code": 1,
  "msg": "text",
  "data": {
    "expect_amount1": "text",
    "expect_amount2": "text",
    "expect_transfer_fee": 1,
    "check_sum": "text",
    "tx_size": 1,
    "usr_cnt": 1,
    "vins": [
      "text"
    ]
  },
  "req_id": "text"
}

Example

{
    "tick1": "BTC",
    "tick2": "RUNEONERUNEONE",
    "coin_type_1": "btc",
    "coin_type_2": "runes",
    "payer_ord_addr": "tb1qge80xavle7c7k0tk7vceaavwcgpsr3jchl0w3e",
    "payer_btc_addr": "tb1qge80xavle7c7k0tk7vceaavwcgpsr3jchl0w3e",
    "percent": "15",
    "slipper": "12",
    "fee_rate": "57",
    "payer_pub_key": "02d3ac7452920b1cc4653516dd4f4381a2df0a8c0aac6e3446e633a73ea63eee81:02d3ac7452920b1cc4653516dd4f4381a2df0a8c0aac6e3446e633a73ea63eee81"
}

The returned result should be passed as is to the create_remove_liquid_psbt (the following interface).

Create remove liquidity PSBT

post
Header parameters
AuthorizationstringOptional

token

User-IdstringOptional
Body
tick1stringRequired
tick2stringRequired
coin_type_1stringRequired
coin_type_2stringRequired
percentstringRequired
payer_btc_addrstringRequired
payer_ord_addrstringRequired
payer_pub_keystringRequired
slipperstringRequired
fee_ratestringRequired
expect_amount1stringRequired
expect_amount2stringRequired
expect_transfer_feeintegerRequired
check_sumstringRequired
tx_sizeintegerRequired
usr_cntintegerRequired
vinsstring[]Required
Responses
200
Success
application/json
post
POST /brc20swap/v2/create_remove_liquid_psbt HTTP/1.1
Host: 
Content-Type: application/json
Accept: */*
Content-Length: 327

{
  "tick1": "text",
  "tick2": "text",
  "coin_type_1": "text",
  "coin_type_2": "text",
  "percent": "text",
  "payer_btc_addr": "text",
  "payer_ord_addr": "text",
  "payer_pub_key": "text",
  "slipper": "text",
  "fee_rate": "text",
  "expect_amount1": "text",
  "expect_amount2": "text",
  "expect_transfer_fee": 1,
  "check_sum": "text",
  "tx_size": 1,
  "usr_cnt": 1,
  "vins": [
    "text"
  ]
}
{
  "code": 1,
  "msg": "text",
  "data": {
    "order_id": "text",
    "psbt": "text",
    "checksum": "text"
  },
  "req_id": "text"
}

Example

{
    "expect_amount1": "1500",
    "expect_amount2": "75",
    "expect_transfer_fee": 20121,
    "check_sum": "D6CCF094281BC79DD4AF6E7A7FBF1CDA",
    "tx_size": 353,
    "usr_cnt": 1,
    "vins": [
        "6cf1c2614a4eaaadf68769909b04687a2ddc4d6082fe4a78654dfad08a9a9323:6"
    ],
    "tick1": "BTC",
    "tick2": "RUNEONERUNEONE",
    "coin_type_1": "btc",
    "coin_type_2": "runes",
    "payer_ord_addr": "tb1qge80xavle7c7k0tk7vceaavwcgpsr3jchl0w3e",
    "payer_btc_addr": "tb1qge80xavle7c7k0tk7vceaavwcgpsr3jchl0w3e",
    "percent": "15",
    "slipper": "12",
    "fee_rate": "57",
    "payer_pub_key": "02d3ac7452920b1cc4653516dd4f4381a2df0a8c0aac6e3446e633a73ea63eee81:02d3ac7452920b1cc4653516dd4f4381a2df0a8c0aac6e3446e633a73ea63eee81"
}

Remove liquidity

post
Header parameters
AuthorizationstringOptional

token

User-IdstringOptional
Body
order_idstringRequired
psbtstringRequired
checksumstringRequired
Responses
200
Success
application/json
post
POST /brc20swap/v2/remove_liquid_by_psbt HTTP/1.1
Host: 
Content-Type: application/json
Accept: */*
Content-Length: 96

{
  "order_id": "text",
  "psbt": "text",
  "checksum": "text",
  "to_sign_inputs": [
    {
      "index": 1,
      "type": "text"
    }
  ]
}
{
  "code": 1,
  "msg": "text",
  "data": null,
  "req_id": "text"
}

Example

{
    "psbt": "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",
    "order_id": "liquid_972788279311073280",
    "checksum": "CAA324EB56C64FA1A6646C9AED0E2BAF",
    "to_sign_inputs": null
}

Get liquidity pool info based on removal ratio

post
Header parameters
AuthorizationstringOptional

token

User-IdstringOptional
Body
addressstringRequired
lp_precentintegerRequired

Decimal, Percentage, Integer

from_tickstringRequired

Only BTC for now

to_tickstringRequired
from_coin_typestringRequired
to_coin_typestringRequired
Responses
200
Success
application/json
post
POST /brc20swap/get_liquid_info HTTP/1.1
Host: 
Content-Type: application/json
Accept: */*
Content-Length: 115

{
  "address": "text",
  "lp_precent": 1,
  "from_tick": "text",
  "to_tick": "text",
  "from_coin_type": "text",
  "to_coin_type": "text"
}
{
  "code": 1,
  "msg": "text",
  "data": {
    "from_amount": "text",
    "to_amount": "text",
    "mutisign_fee_proportion": "text"
  }
}

Example

{
    "address": "tb1qge80xavle7c7k0tk7vceaavwcgpsr3jchl0w3e",
    "lp_precent": 35,
    "from_tick": "BTC",
    "to_tick": "RUNEONERUNEONE",
    "from_coin_type": "btc",
    "to_coin_type": "runes"
}

Explanation on Fees

The actual amount received by the user will have the key custodial service's fee deducted, which is calculated using the mutisign_fee_proportion field returned by the backend (initially 0.3%, and may adjust in the future if the key custodial service changes).

Fee Calculation

  • Removing BTC-BRC20: Fee = BTC satoshi amount * 0.3%

  • Removing BTC-ARC20: Fee = BTC satoshi amount * 0.3% + ARC20 satoshi amount * 0.3%

  • Removing BRC20-BRC20: Free

Calculation of the Actual Amount Received by the User:


if (from_coin_type === "btc") {
  finally_from_amount = from_amount * (1 - mutisign_fee_proportion); 
  if (to_coin_type === "arc20") {
    finally_from_amount =
      finally_from_amount - to_amount * mutisign_fee_proportion;
  }
  finally_to_amount = to_amount;
}
if (to_coin_type === "btc") {
  finally_from_amount = from_amount;
  finally_to_amount = to_amount * (1 - mutisign_fee_proportion);
  if (to_coin_type === "arc20") {
    finally_to_amount =
      finally_to_amount - from_amount * mutisign_fee_proportion;
  }
}

The estimated amount will change in real-time based on the total token amount in the liquidity pool. Your frontend can perform polling requests to obtain the latest estimate.

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