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You can access the underlying value from within an `.Apply()` callback.

More on this at <https://www.pulumi.com/docs/intro/concepts/programming-model/#outputs>.  Also in this video (though focused on Node.js): <https://www.youtube.com/watch?v=lybOxul2otM>

If you have a snippet of what you are trying, might be able to suggest a specific solution.

Hi <@UB3BGTV63>, I'm calling <https://github.com/pulumi/pulumi-packet/blob/6f22a18281cc0958f7fb6111de62028504dc42a8/sdk/go/packet/spotMarketRequest.go#L68> and need to use the `ID()` in the call to `LookupSpotMarketRequest` by passing a `RequestId` (<https://github.com/pulumi/pulumi-packet/blob/6f22a18281cc0958f7fb6111de62028504dc42a8/sdk/go/packet/getSpotMarketRequest.go#L23>) which is a `string` (should it be a `StringInput`?) which is why I need to grab the `string` value from `x.ID()`

Got it - you should be able to just use `.ToStringOutput()` on the id.

Ahh - no - I see the second part.  You then need to call `LookupSpotMarketRequest` inside an `Apply`, since you cannot call that  until the underlying ID is available.

Here's a similar example:

```bucket, err := s3.NewBucket(ctx, "my-bucket", nil)
if err != nil {
	return err
}
hostedZoneId := bucket.ID().ApplyString(func(id pulumi.ID) (string, error) {
	res, err := s3.LookupBucket(ctx, &amp;s3.LookupBucketArgs{Bucket: string(id)})
	if err != nil {
		return "", err
	}
	return res.HostedZoneId, nil
})```

Great, thanks :+1: Will give a try later.