FutarchyFactory

Futarchy factory is used to create price-based futarchy markets. Market creation logic:

Ask reality questions.
Prepare condition.
Create new erc20 outcome tokens.
Initialize a new market contract.

Variables

CreateProposalParams

struct CreateProposalParams {
  string marketName;
  IERC20 collateralToken1;
  IERC20 collateralToken2;
  string category;
  string lang;
  uint256 minBond;
  uint32 openingTime;
}

REALITY_SINGLE_SELECT_TEMPLATE

uint8 REALITY_SINGLE_SELECT_TEMPLATE

Template for categorical markets.

questionTimeout

uint32 questionTimeout

Reality question timeout.

arbitrator

address arbitrator

Arbitrator contract.

realitio

contract IRealityETH_v3_0 realitio

Reality.eth contract.

wrapped1155Factory

contract IWrapped1155Factory wrapped1155Factory

Wrapped1155Factory contract.

conditionalTokens

contract IConditionalTokens conditionalTokens

Conditional Tokens contract.

collateralToken

address collateralToken

Conditional Tokens collateral token contract.

realityProxy

contract RealityProxy realityProxy

Oracle contract.

proposals

address[] proposals

Proposals created by this factory.

proposal

address proposal

Proposal contract.

Events

NewProposal

event NewProposal(address indexed proposal, string marketName, bytes32 conditionId, bytes32 questionId)

To be emitted when a new proposal is created. Parameters

Name	Type	Description
proposal	address	The new proposal address.
marketName	string	The name of the market.
conditionId	bytes32	Conditional Tokens conditionId.
questionId	bytes32	Conditional Tokens questionId.

Functions

constructor

constructor(address _proposal, address _arbitrator, contract IRealityETH_v3_0 _realitio, contract IWrapped1155Factory _wrapped1155Factory, contract IConditionalTokens _conditionalTokens, contract RealityProxy _realityProxy, uint32 _questionTimeout) public

Constructor.

Name	Type	Description
_proposal	address	Address of the proposal contract that is going to be used for each new deployment.
_arbitrator	address	Address of the arbitrator that is going to resolve Realitio disputes.
_realitio	contract IRealityETH_v3_0	Address of the Realitio implementation.
_wrapped1155Factory	contract IWrapped1155Factory	Address of the Wrapped1155Factory implementation.
_conditionalTokens	contract IConditionalTokens	Address of the ConditionalTokens implementation.
_realityProxy	contract RealityProxy	Address of the RealityProxy implementation.
_questionTimeout	uint32	Reality question timeout.

createProposal

function createProposal(struct FutarchyFactory.CreateProposalParams params) external returns (address)

Creates a price-based futarchy market and deploys the wrapped ERC20 tokens. Parameters

Name	Type	Description
params	struct FutarchyFactory.CreateProposalParams	CreateProposalParams instance.

Return Values

Name	Type	Description
[0]	address	The new proposal address.

Logic

Ask reality questions.
Prepare condition.
Create new erc20 outcome tokens.
Initialize a new proposal contract.

createNewProposalParams

function createNewProposalParams(struct FutarchyFactory.CreateProposalParams params, string[] memory tokenNames) internal returns (struct FutarchyProposal.FutarchyProposalParams)

Creates the structures needed to initialize the new proposal. Parameters

Name	Type	Description
params	struct FutarchyFactory.CreateProposalParams	CreateProposalParams instance.
tokenNames	string[] memory	Array with the names of the outcome tokens.

Return Values

Name	Type	Description
[0]	struct FutarchyProposal.FutarchyProposalParams	FutarchyProposal.FutarchyProposalParam instance.

getOutcomesAndTokens

function getOutcomesAndTokens(IERC20 collateralToken1, IERC20 collateralToken2) internal view returns (string memory[], string memory[])

Creates the outcomes and token names. Parameters

Name	Type	Description
collateralToken1	IERC20	The token collateral.
collateralToken2	IERC20	The currency collateral.

Return Values

Name	Type	Description
[0]	string[]	The outcomes names.
[1]	string[]	The wrapped ERC20 names.

encodeRealityQuestion

function encodeRealityQuestion(string question, string category, string lang) internal pure returns (string)

Encodes the question, category and language following the Reality structure. If any parameter has a special character like quotes, it must be properly escaped. Parameters

Name	Type	Description
question	string	The question text.
category	string	The question category.
lang	string	The question language.

Return Values

Name	Type	Description
[0]	string	The encoded question.

askRealityQuestion

function askRealityQuestion(string encodedQuestion, uint256 templateId, uint32 openingTime, uint256 minBond) internal returns (bytes32)

Asks a question on reality. Parameters

Name	Type	Description
encodedQuestion	string	The encoded question containing the Reality parameters.
templateId	uint256	The Reality template id.
openingTime	uint32	The question opening time.
minBond	uint256	The question min bond.

Return Values

Name	Type	Description
[0]	bytes32	The question id

prepareCondition

function prepareCondition(bytes32 questionId, uint256 outcomeSlotCount) internal returns (bytes32)

Prepares the CTF condition and returns the conditionId. Parameters

Name	Type	Description
questionId	bytes32	An identifier for the question to be answered by the oracle.
outcomeSlotCount	uint256	The number of outcome slots which must be used for this condition. Must not exceed 256.

Return Values

Name	Type	Description
[0]	bytes32	Condition ID.

Pre-condition

Reality question asked and return questionsId.

Logic

It will check if there is a prepared condition on ConditionalTokens, and call conditionalTokens.prepareCondition() if there isn’t any.

deployERC20Positions

function deployERC20Positions(IERC20 collateralToken1, IERC20 collateralToken2, bytes32 parentCollectionId, bytes32 conditionId, string[] tokenNames) internal returns (contract IERC20[] wrapped1155, bytes[] data)

Wraps the ERC1155 outcome tokens to ERC20. Parameters

Name	Type	Description
collateralToken1	ERC20	The token collateral.
collateralToken2	ERC20	The currency collateral.
parentCollectionId	bytes32	The parentCollectionId.
conditionId	bytes32	The conditionId.
tokenNames	string[]	The name of each outcome token.

Return Values

Name	Type	Description
wrapped1155	contract IERC20[]	Array of outcome tokens wrapped to ERC20.
data	bytes[]	Array of token data used to create each ERC20.

Logic

It will call wrapped1155Factory.requireWrapped1155 to create an ERC20 token contract for each position. The new tokens addresses and data are saved in Proposal contract.

toString31

function toString31(string value) internal pure returns (bytes32 encodedString)

Encodes a short string (less than than 31 bytes long) as for storage as expected by Solidity. See https://github.com/gnosis/1155-to-20/pull/4#discussion_r573630922. Parameters

Name	Type	Description
value	string	String to encode

Return Values

Name	Type	Description
encodedString	bytes32	The encoded string.

allMarkets

function allMarkets() external view returns (address[])

Returns all the proposals created by this factory. Return Values

Name	Type	Description
[0]	address[]	The addresses of the proposals.

marketsCount

function marketsCount() external view returns (uint256)

Returns the amount of proposals created by this factory. Return Values

Name	Type	Description
[0]	uint256	The amount of proposals.

Getting started

Guides

HTTP API

Diagrams

Subgraph

Contracts

FutarchyFactory

Variables

CreateProposalParams

REALITY_SINGLE_SELECT_TEMPLATE

questionTimeout

arbitrator

realitio

wrapped1155Factory

conditionalTokens

collateralToken

realityProxy

proposals

proposal

Events

NewProposal

Functions

constructor

createProposal

createNewProposalParams

getOutcomesAndTokens

encodeRealityQuestion

askRealityQuestion

prepareCondition

deployERC20Positions

toString31

allMarkets

marketsCount

​Variables

​CreateProposalParams

​REALITY_SINGLE_SELECT_TEMPLATE

​questionTimeout

​arbitrator

​realitio

​wrapped1155Factory

​conditionalTokens

​collateralToken

​realityProxy

​proposals

​proposal

​Events

​NewProposal

​Functions

​constructor

​createProposal

​createNewProposalParams

​getOutcomesAndTokens

​encodeRealityQuestion

​askRealityQuestion

​prepareCondition

​deployERC20Positions

​toString31

​allMarkets

​marketsCount

Variables

CreateProposalParams

REALITY_SINGLE_SELECT_TEMPLATE

questionTimeout

arbitrator

realitio

wrapped1155Factory

conditionalTokens

collateralToken

realityProxy

proposals

proposal

Events

NewProposal

Functions

constructor

createProposal

createNewProposalParams

getOutcomesAndTokens

encodeRealityQuestion

askRealityQuestion

prepareCondition

deployERC20Positions

toString31

allMarkets

marketsCount