Watch AMM Liquidity Mints

amm.watchMint

Watches Mint events on the fee AMM.

Usage

import {  } from './viem.config'
 
const  = ..()
 
.(() => {
  for (const  of ) .(.)
{ sender: '0x742d35Cc6634C0532925a3b844Bc9e7595f0bEbb', to: '0x742d35Cc6634C0532925a3b844Bc9e7595f0bEbb', userToken: '0x20c0000000000000000000000000000000000001' }
})
 
// Later, tear down the watcher.
.()

import { ,  } from 'viem/tempo'
 
export const  = .({
  : .('0x...'),
})

Also callable standalone: Actions.amm.watchMint(client, options), with Actions imported from 'viem/tempo'.

Recipes

Confirm Treasury LP Deposits

Filter args.to to the treasury when several operator wallets fund pools, so a dashboard only processes deposits that credit the treasury.

import {  } from './viem.config'
 
const  = ..({
  : { : '0x8ba1f109551bD432803012645Ac136ddd64DBA72' },
})
 
.(() => {
  for (const  of )
    .('Deposit:', .., ..)
Deposit: 0xf39Fd6e51aad88F6F4ce6aB8827279cffFb92266 1000000n
})

import { ,  } from 'viem/tempo'
 
export const  = .({
  : .('0x...'),
})

Resume Watching from the Last Processed Block

Pass fromBlock when an indexer restarts, so mints emitted while it was offline are replayed before live events.

import {  } from './viem.config'
 
// Last block the indexer processed, loaded from its store.
const  = 1_204_320n
 
const  = ..({
  :  + 1n,
})
 
.(() => {
  for (const  of ) .(., ..)
})

import { ,  } from 'viem/tempo'
 
export const  = .({
  : .('0x...'),
})

Return Value

Returns a watcher handle. Watching starts when the first listener (or async iterator) attaches, and stops when off is called.

type ReturnType = {
  /** Registers a log listener. Starts the watcher on first registration. Returns an unregister function. */
  onLogs: (fn: (logs: readonly Log[]) => void) => () => void
  /** Registers an error listener. Returns an unregister function. */
  onError: (fn: (error: Error) => void) => () => void
  /** Tears down the watcher: removes listeners, ends iterators, stops the poll or subscription. */
  off: () => void
  /** Async-iterates emitted log batches (latest-only stream). */
  [Symbol.asyncIterator]: () => AsyncIterableIterator<{ logs: readonly Log[] }>
}

Each log is decoded, with the event arguments on args:

type Log = {
  /** Decoded `Mint` event arguments. */
  args: {
    /** Address that added liquidity. */
    sender: Address
    /** Address that received LP tokens. */
    to: Address
    /** User token address. */
    userToken: Address
    /** Validator token address. */
    validatorToken: Address
    /** Amount of validator token added. */
    amountValidatorToken: bigint
    /** Amount of LP tokens minted. */
    liquidity: bigint
  }
  /** Name of the emitted event. */
  eventName: 'Mint'
  // ...standard log fields (address, blockHash, blockNumber, logIndex, transactionHash, ...)
}

Parameters

args

Type: object

type Args = {
  /** Filter by address that received LP tokens. */
  to?: Address | Address[] | null
}

Indexed argument values to filter logs by.

batch

Type: boolean
Default: true

Whether to batch the logs found within a poll interval into a single emission. When false, each log is emitted on its own.

fromBlock

Type: bigint

Block number from which to start watching for logs.

poll

Type: boolean

Whether to poll for new logs instead of using a subscription. Defaults to true when the transport cannot subscribe or fromBlock is provided.

pollingInterval

Type: number
Default: client.pollingInterval

Polling frequency (in ms).

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