Composer Require: Could not find package

The reason behind this error is your git repo does not contain any tags.

Add tags like

git tag -a 1.0.0
git push --tags

Now you can use

composer require digitaldonkey/ethereum-php

Explanation If we see composer.json, you will find require tag which contains packages along with their versions. e.g.

"require": {
    "php": ">=7.0.0",
    "afrazahmad/clear-cached-data": "^1.0"
},

So versions or tags are important. Hope it helps.

If you are adding to a different folder other than the project, you get the same error. delete your previous installation and try cd project_name.

Open your composer.json if that package has no stable version then you have to change your minimum-stability to dev.

https://getcomposer.org/doc/04-schema.md#minimum-stability

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