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launch_exchange
An entrypoint that launches a new exchanges. Next types of exchanges are supported:
  • FA1.2/FA1.2;
  • FA1.2/FA2;
  • FA1.2/TEZ;
  • FA2/FA1.2;
  • FA2/FA2;
  • FA2/TEZ;
  • TEZ/FA1.2;
  • TEZ/FA2.
In case of TOK/TEZ exchange launch voting in appropriative Bucket contract is executed. Also all TEZ tokens is transferred to the same Bucket contract before voting.
In time of first exchange launch, this contract calls launch_callback entrypoint. This is done in order to vote on a Bucket contract that has just been deployed and cannot be accessed until the launch exchange transaction completes. Therefore, voting takes place in the next transaction, sent from launch_callback.

Call parameters

type tez_t is unit
โ€‹
type fa12_token_t is address
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type fa2_token_t is [@layout:comb] record [
token : address;
id : nat;
]
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type token_t is
| Tez of tez_t
| Fa12 of fa12_token_t
| Fa2 of fa2_token_t
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type tokens_t is [@layout:comb] record [
token_a : token_t;
token_b : token_t;
]
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type launch_exchange_t is [@layout:comb] record [
pair : tokens_t;
token_a_in : nat;
token_b_in : nat;
shares_receiver : address;
candidate : key_hash;
deadline : timestamp;
]

tokens_t

Field
Type
Description
token_a
token_t
FA1.2/FA2/TEZ token
token_b
token_t
FA1.2/FA2/TEZ token

launch_exchange_t

Field
Type
Description
pair
โ€‹tokens_tโ€‹
Tokens to launch exchange with
token_a_in
nat
Amount of token A for investment
token_b_in
nat
Amount of token B for investment
shares_receiver
address
Receiver of LP tokens
candidate
key_hash
Baker for voting (is used only in case of TOK/TEZ exchanges launch). Ignored otherwise
deadline
timestamp
The time until which the transaction remains valid and will not be rejected

Usage

Note: you need to pass positive TEZ/mutez amount to the send() method in case of FA1.2/TEZ or FA2/TEZ exchanges launch (see example below).
Also don't forget to add the DexCore contract as the operator for your FA2 tokens or make an approve for spending of FA1.2 tokens in time of exchange launch.
๐ŸŒฎ Taquito
const dexCoreAddress = "KT1...";
const params = {
pair: {
token_a: {
fa12: "KT1...",
},
token_b: {
tez: undefined,
},
},
token_a_in: 100,
token_b_in: 100,
shares_receiver: "tz1.../KT1...",
candidate: "tz1...",
deadline: String(Date.parse((await tezos.rpc.getBlockHeader()).timestamp) / 1000 + 100),
};
const dexCore = await tezos.contract.at(dexCoreAddress);
const operation = await dexCore.methodsObject.launch_exchange(params).send({ amount: params.token_b_in, mutez: true });
โ€‹
await operation.confirmation();
Pass candidate: "tz1ZZZZZZZZZZZZZZZZZZZZZZZZZZZZNkiRg"in case of launching TOK/TOK exchange

Errors

  • 104 - wrong order of a tokens from parameters.
  • 105 - zero token A amount in.
  • 106 - zero token B amount in.
  • 107 - pair (pool) with the specified token_id already listed.
  • 120 - wrong TEZ amount were passed to the transaction.
  • 136 - reentrancy.
  • 144 - action outdated (the time until which the transaction remained valid was passed).
  • 412 - non payable entrypoint (can't accept TEZ tokens during call of an entrypoint). Only in case of launching of TOK/TOK liquidity pools (pairs).
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Call parameters
Usage
Errors