Skip to main content

wallet_watchAsset

Requests that the user track the specified token in MetaMask. Returns a boolean indicating if the token was successfully added. Once added, the token is indistinguishable from those added using legacy methods, such as a centralized registry. Introduced by EIP-747.

Parameters

type(string)required

The token type (ERC20, ERC721, or ERC1155). Support for ERC-721 and ERC-1155 tokens is experimental and currently only available on the extension (not on mobile). See MIP-1 and the MIP proposal lifecycle for more information.

options(object)

An object containing information about the token.

Returns

true if the token was added, false otherwise.

Errors

CodeDescription
-32602

Must specify address, symbol, and decimals.

-32602

Invalid symbol: not a string.

-32602

Invalid symbol '${symbol}': longer than 11 characters.

-32602

Invalid decimals '${decimals}': must be 0 <= 36.

-32602

Invalid address '${address}'.

-32602

Asset type is required.

-32602

Both address and tokenId are required.

-32602

Invalid address.

-32000

Suggested NFT is not owned by the selected account.

-32000

Suggested NFT of type ${standard} does not match received type ${type}.

-32002

Unable to verify ownership. Possibly because the standard is not supported or the user's currently selected network does not match the chain of the asset in question.

Example request
await provider.request({
  method: "wallet_watchAsset",
  params: [
"ERC20",
{
  "address": "0xb60e8dd61c5d32be8058bb8eb970870f07233155",
  "symbol": "FOO",
  "decimals": 18,
  "image": "https://foo.io/token-image.svg"
}
]
});
Example response
{
  "id": 1,
  "jsonrpc": "2.0",
  "result": true
}