Last Look

Last look is implemented by servers that provide quote levels and accept signed orders provided by clients.
Protocol
Client establishes a websocket connection to the Server.
Client calls subscribeLevels on the Server.
Server periodically calls updateLevels on the Client.
Client periodically calls provideOrder to the Server with a signed order.
Client calls unsubscribeLevels to unsubscribe from the stream.
Server Methods
In Last Look protocols, the Client is the order signer and Server the order sender.
subscribeLevels
A request to receive updates to quote levels for a token pair. Returns the current quote levels.
subscribeLevels(
  signerToken: string, // Token the Client would transfer
  senderToken: string  // Token the Server would transfer
): Levels
unsubscribeLevels
A request to stop receiving updates to quote levels for a token pair. Returns a boolean.
subscribeLevels(
  signerToken: string, // Token the Client would transfer
  senderToken: string  // Token the Server would transfer
): boolean
getLevels
Given a token pair, return an array of quote levels.
getLevels(
  signerToken: string, // Token the Client would transfer
  senderToken: string  // Token the Server would transfer
): Levels
provideOrder
Provide a signed order to be filled or ignored. Response should be a transaction ID.
provideOrder(
  order: Order // Signed order as specified below
): string
Client Methods
updateLevels
Update quote levels for a token pair. This is a notification so returns no result.
updateLevels(
  levels: Levels // Levels object as specified below
)
Types
Levels
Tuple with an amount of signerToken and respective amount of senderToken in atomic units.
{
  signerToken: string               // Token the Client would transfer
  senderToken: string               // Token the Server would transfer
  amounts: Array<[string, string]>  // Array of quote levels
  timestamp?: string                // Optional timestamp of the quote levels
  url?: string                      // Optional url of the server
}
Order
Object with the parameters of a firm order to be filled.
{
  nonce: string,        // Single use nonce
  expiry: string,       // Expiry in seconds
  signerWallet: string, // Wallet of the Client
  signerToken: string,  // Token the Client would transfer
  signerAmount: string, // Amount the Client would transfer
  senderToken: string,  // Token the Server would transfer
  senderAmount: string, // Amount the Server would transfer
  v: string,            // ECDSA signature
  r: string,
  s: string
}
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Indexer
Last updated 3 days ago
Last Look

Protocol

Server Methods

`subscribeLevels`

`unsubscribeLevels`

`getLevels`

`provideOrder`

Client Methods

`updateLevels`

Types

`Levels`

`Order`
