Use the runes_estimateEtch method to estimate the cost of a Rune etch order for your user, before executing it.

You can specify the characteristics of the Runes etch order you wish to estimate, by passing an EstimateEtchParams object to the method, with the below properties:

EstimateEtchParams Description


a string representing the name of the Rune to etch

a number representing the rune's divisibility, i.e. how finely it may be divided into its atomic units. Divisibility is expressed as the number of digits permissible after the decimal point in an amount of runes. The default value is 0.

a string representing the rune's currency symbol as a single . If a rune does not have a symbol, the generic currency sign ยค, also called a scarab, should be used

a string representing rune premine: the amount of rune units which the etcher can optionally allocate to themselves.


a boolean indicating if the rune may have an open mint, allowing anyone to create and allocate units of that rune for themselves.

an object describing the terms governing minting if the rune is mintable, with the below properties:

  • amount a string representing the fixed amount of new units of the rune that each mint transaction creates

  • cap a string representing the number of times a rune may be minted.

You can optionally use the Rune etching transactions to inscribe some content for your user: - the inscription will be sent to the specified destinationAddress, along with the etched Runes - the etched Runes will be linked to the inscription If you wish to use that option, pass an inscriptionDetails object with the below properties to specify the content to inscribe:

  • contentType a string representing the content/mime type of the content being inscribed. Make sure you extract and pass the correct content type for the content you wish to inscribe

  • contentBase64 a string representing the content you wish to inscribe, encoded in Base64 format

If you wish to use the Rune etching transactions to create an inscription, you can optionally nominate a delegate for your inscription, as an alternative to specifying its content with inscriptionDetail (see above)

You can instead choose to pass a delegateInscriptionId string representing the serialized binary inscription ID of the delegate.



a number representing the desired fee rate to set for the Rune etch transactions, in sats per vbytes

a number representing the sats value of the fee to charge your user for your service.

a string representing the Bitcoin address which will receive the appServiceFee, if a fee is specified

a string representing the Bitcoin network to use for the etch transactions: 'Mainnet' or 'Testnet'

   import { Wallet } from "sats-connect";
    const response = await Wallet.request('runes_estimateEtch', {
      runeName: "UNCOMMONGOODS",
      premine: ,
      isMintable: ,
      destinationAddress: ,
      // add request params described above

    if (response.status === 'success') {
    } else {
      alert('Error Fetching Estimate. See console for details.');

The runes_estimateEtch method will not trigger any etch operation or prompt your user to sign any transaction. It will return an EstimateEtchResponse object, intended for you and your user to anticipate the etching costs and their breakdown:

EstimateEtchResponse property Description


a number representing the total size of the etch transactions, in vbytes


a number representing the total cost of the etch transactions in sats


An object representing the cost breakdown of the etch transactions, with the below properties:

  • postage a number representing the total size of the Rune UTXOs etched, in sats

  • networkFee a number representing the total network fee for the etch transactions, in sats

  • serviceFee a number representing the total Sats Connect fee for processing the etch order, in sats

  • appServiceFee a number representing the optional service fee your app charges the user for the etch order

See the runes_etch method if you wish to execute a Runes etch order after estimating its cost.

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