Discovery

To find servers that support a token pair, clients call the getURLsForToken function on the Registry contract for each token and then intersect the results. For example, if the resulting URLs for token A are [maker1.com, maker2.com] and for token B are [maker2.com, maker3.com] then the only server supporting swapping token A for B is maker2.com.

See getURLsForToken on the Registry contract:

function getURLsForToken(address token) external view returns (string[] memory urls);

Check deployments for latest contract addresses for Registry.

Fetching URLs via CLI

Ensure the AirSwap CLI is installed.

$ yarn global add airswap

Use airswap chain to set your chain to Goerli or Mainnet.

$ airswap chain
AirSwap CLI 4.0.1 — https://www.airswap.io/

set the active ethereum chain

Current chain: 5 (GOERLI)

New chain id:  (5) 1

Set active chain to ETHEREUM.

Use registry:get to fetch server URLs for a token pair.

$ airswap registry:list
AirSwap CLI 4.0.1 — https://www.airswap.io/

get urls from the registry ETHEREUM

Registry 0x8F9DA6d38939411340b19401E8c54Ea1f51B8f95

Token pair (e.g. WETH/USDT):  dai/weth

Server
----------------------------------------
https://maker.example.com/

Example: Take an Order

Try airswap order with a server URL from the previous command.

TypeScript

Using the Registry library from @airswap/libraries returns Server instances that you can interact with.

import { Protocols } from "@airswap/utils";
import { Registry } from '@airswap/libraries'
const servers = await Registry.getServers(
  provider,
  chainId,
  Protocols.RequestForQuoteERC20,
  signerToken,
  senderToken
)

Calling the Registry directly using ethers

import { ethers } from 'ethers'
import { chainNames } from '@airswap/utils'
import * as RegistryContract from '@airswap/registry/build/contracts/Registry.sol/Registry.json'
import * as registryDeploys from '@airswap/registry/deploys.js'
const RegistryInterface = new ethers.utils.Interface(
  JSON.stringify(RegistryContract.abi),
)

new ethers.Contract(
  registryDeploys[chainId],
  RegistryInterface,
  ethers.getDefaultProvider(chainNames[chainId].toLowerCase()),
)

const signerTokenURLs = await this.contract.getURLsForToken(signerToken)
const senderTokenURLs = await this.contract.getURLsForToken(senderToken)

const serverURLs = signerTokenURLs.filter((value) =>
  senderTokenURLs.includes(value),
)

Example: Take an Order

import { Registry, SwapERC20 } from '@airswap/libraries'
import { chainNames } from '@airswap/utils'

const servers = await Registry.getServers(
  provider,
  chainId,
  Protocols.RequestForQuoteERC20,
  signerToken,
  senderToken
)

const order = servers[0].getSignerSideOrderERC20(
  senderAmount,
  signerToken,
  senderToken,
  senderWallet
)

const tx = await new SwapERC20(chainId, provider).swapLight(order)