MarketFactory

Market factory is used to create prediction markets of different types. Market creation logic:

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

Variables

CreateMarketParams

Workaround “stack too deep” errors.

struct CreateMarketParams {
  string marketName;
  string[] outcomes;
  string questionStart;
  string questionEnd;
  string outcomeType;
  uint256 parentOutcome;
  address parentMarket;
  string category;
  string lang;
  uint256 lowerBound;
  uint256 upperBound;
  uint256 minBond;
  uint32 openingTime;
  string[] tokenNames;
}

InternalMarketConfig

Workaround “stack too deep” errors.

struct InternalMarketConfig {
  string[] encodedQuestions;
  uint256 outcomeSlotCount;
  uint256 templateId;
}

REALITY_UINT_TEMPLATE

uint8 REALITY_UINT_TEMPLATE

Template for scalar and multi scalar markets.

REALITY_SINGLE_SELECT_TEMPLATE

uint8 REALITY_SINGLE_SELECT_TEMPLATE

Template for categorical markets.

REALITY_MULTI_SELECT_TEMPLATE

uint8 REALITY_MULTI_SELECT_TEMPLATE

Template for multi 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.

markets

address[] markets

Markets created by this factory.

market

address market

Market contract.

Events

NewMarket

event NewMarket(address market, string marketName, address parentMarket, bytes32 conditionId, bytes32 questionId, bytes32[] questionsIds)

To be emitted when a new market is created. Parameters

Name	Type	Description
market	address	The new market address.
marketName	string	The name of the market.
parentMarket	address	Conditional market to use.
conditionId	bytes32	Conditional Tokens conditionId.
questionId	bytes32	Conditional Tokens questionId.
questionsIds	bytes32[]	Reality questions ids.

Functions

constructor

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

Constructor.

Name	Type	Description
_market	address	Address of the market 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.
_collateralToken	address	Address of the collateral token.
_realityProxy	contract RealityProxy	Address of the RealityProxy implementation.
_questionTimeout	uint32	Reality question timeout.

createCategoricalMarket

function createCategoricalMarket(struct MarketFactory.CreateMarketParams params) external returns (address)

Categorical markets are associated with a Reality question that has only one answer. Creates a Categorical market. Parameters

Name	Type	Description
params	struct MarketFactory.CreateMarketParams	CreateMarketParams instance.

Return Values

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

Logic

Validate outcomes length (>= 2).
Encode 1 reality question.
Call createMarket.

createMultiCategoricalMarket

function createMultiCategoricalMarket(struct MarketFactory.CreateMarketParams params) external returns (address)

Multi Categorical markets are associated with a Reality question that has one or more answers. Creates a Multi Categorical market. Parameters

Name	Type	Description
params	struct MarketFactory.CreateMarketParams	CreateMarketParams instance.

Return Values

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

Logic

Validate outcomes length (>=2).
Encode 1 reality question.
Call createMarket.

createScalarMarket

function createScalarMarket(struct MarketFactory.CreateMarketParams params) external returns (address)

Scalar markets are associated with a Reality question that resolves to a numeric value. Creates a Scalar market. Parameters

Name	Type	Description
params	struct MarketFactory.CreateMarketParams	CreateMarketParams instance.

Return Values

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

Logic

Validate upperBound and lowerBound.
Validate outcomes length (2).
Encode 1 reality question.
Call createMarket.

createMultiScalarMarket

function createMultiScalarMarket(struct MarketFactory.CreateMarketParams params) external returns (address)

Multi Scalar markets are associated with two or more Reality questions, and each one of them resolves to a numeric value. Creates a Multi Scalar market. Parameters

Name	Type	Description
params	struct MarketFactory.CreateMarketParams	CreateMarketParams instance.

Return Values

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

Logic

Validate outcomes length (>=2).
Encode reality questions, one for each outcome.

Instead of using params.marketName, encode a new marketName.

abi.encodePacked(
    params.questionStart,
    "[",
    params.outcomeType,
    "]",
    params.questionEnd
)

Call createMarket.

createMarket

function createMarket(struct MarketFactory.CreateMarketParams params, string marketName, struct MarketFactory.InternalMarketConfig config) internal returns (address)

Creates the Market and deploys the wrapped ERC20 tokens. Parameters

Name	Type	Description
params	struct MarketFactory.CreateMarketParams	CreateMarketParams instance.
marketName	string	The market name.
config	struct MarketFactory.InternalMarketConfig	InternalMarketConfig instance.

Return Values

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

Logic

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

createNewMarketParams

function createNewMarketParams(struct MarketFactory.CreateMarketParams params, struct MarketFactory.InternalMarketConfig config) internal returns (struct Market.ConditionalTokensParams, struct Market.RealityParams)

Creates the structures needed to initialize the new market. Parameters

Name	Type	Description
params	struct MarketFactory.CreateMarketParams	CreateMarketParams instance.
config	struct MarketFactory.InternalMarketConfig	InternalMarketConfig instance.

Return Values

Name	Type	Description
[0]	struct Market.ConditionalTokensParams	Market.ConditionalTokensParams instance.
[1]	struct Market.RealityParams	Market.RealityParams instance.

encodeRealityQuestionWithOutcomes

function encodeRealityQuestionWithOutcomes(string question, string[] outcomes, string category, string lang) internal pure returns (string)

Encodes the question, outcomes, 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.
outcomes	string[]
category	string	The question category.
lang	string	The question language.

Return Values

Name	Type	Description
[0]	string	The encoded question.

encodeRealityQuestionWithoutOutcomes

function encodeRealityQuestionWithoutOutcomes(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 questions asked and return questionsIds.
questionId is hashed from all the values that RealityProxy.resolve() uses to resolve a market (questionsIds, outcomes.length, templateId, lowerBound, upperBound).

Logic

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

deployERC20Positions

function deployERC20Positions(bytes32 parentCollectionId, bytes32 conditionId, uint256 outcomeSlotCount, string[] tokenNames) internal returns (contract IERC20[] wrapped1155, bytes[] data)

Wraps the ERC1155 outcome tokens to ERC20. The INVALID_RESULT outcome is always called SER-INVALID. Parameters

Name	Type	Description
parentCollectionId	bytes32	The parentCollectionId.
conditionId	bytes32	The conditionId.
outcomeSlotCount	uint256	The amount of outcomes.
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 is saved in Market 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 markets created by this factory. Return Values

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

marketCount

function marketCount() external view returns (uint256)

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

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

Getting started

Guides

HTTP API

Diagrams

Subgraph

Contracts

MarketFactory

Variables

CreateMarketParams

InternalMarketConfig

REALITY_UINT_TEMPLATE

REALITY_SINGLE_SELECT_TEMPLATE

REALITY_MULTI_SELECT_TEMPLATE

questionTimeout

arbitrator

realitio

wrapped1155Factory

conditionalTokens

collateralToken

realityProxy

markets

market

Events

NewMarket

Functions

constructor

createCategoricalMarket

createMultiCategoricalMarket

createScalarMarket

createMultiScalarMarket

createMarket

createNewMarketParams

encodeRealityQuestionWithOutcomes

encodeRealityQuestionWithoutOutcomes

askRealityQuestion

prepareCondition

deployERC20Positions

toString31

allMarkets

marketCount

​Variables

​CreateMarketParams

​InternalMarketConfig

​REALITY_UINT_TEMPLATE

​REALITY_SINGLE_SELECT_TEMPLATE

​REALITY_MULTI_SELECT_TEMPLATE

​questionTimeout

​arbitrator

​realitio

​wrapped1155Factory

​conditionalTokens

​collateralToken

​realityProxy

​markets

​market

​Events

​NewMarket

​Functions

​constructor

​createCategoricalMarket

​createMultiCategoricalMarket

​createScalarMarket

​createMultiScalarMarket

​createMarket

​createNewMarketParams

​encodeRealityQuestionWithOutcomes

​encodeRealityQuestionWithoutOutcomes

​askRealityQuestion

​prepareCondition

​deployERC20Positions

​toString31

​allMarkets

​marketCount

Variables

CreateMarketParams

InternalMarketConfig

REALITY_UINT_TEMPLATE

REALITY_SINGLE_SELECT_TEMPLATE

REALITY_MULTI_SELECT_TEMPLATE

questionTimeout

arbitrator

realitio

wrapped1155Factory

conditionalTokens

collateralToken

realityProxy

markets

market

Events

NewMarket

Functions

constructor

createCategoricalMarket

createMultiCategoricalMarket

createScalarMarket

createMultiScalarMarket

createMarket

createNewMarketParams

encodeRealityQuestionWithOutcomes

encodeRealityQuestionWithoutOutcomes

askRealityQuestion

prepareCondition

deployERC20Positions

toString31

allMarkets

marketCount