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Invoice
A vendor supplies an invoice to request payment to an address.
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Receipt
A vendor issues a receipt for payment sent to an address for services.
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Payment
A user wishes to send a payment in a cryptocurrency or tokens with a remittance note attached.
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Gift
A user wishes to send a cryptocurrency or tokens to a relative with a birthday message.
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Donation
A user wishes to send a donation in a cryptocurrency or tokens to a charity with a message.
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Trading digital assets & collectibles
A user loves that cryptokitty, decentralized DNS-equivalent name or other NFT, so sends a message to make an offer to trade.
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After-sales support
After purchasing a digital good or service, I need to contact the vendor for support. I wish to remain anonymous but the vendor needs to ensure that I made the purchase.
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Renewal notification
A service provider sends a message to notify a user to renew a service or take an action (e.g. complete an ENS domain auction).
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Update notifications
A DApp developer releases a new version of software and wishes to notify all previous users.
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Community bug discovery
A smart contract security service provider recognises a vulnerability in contract software. They need to notify the anonymous owner of the contract, but have no way to identify them.
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Airdrop Subscription A project owner or token issuer planning to offer tokens via an airdrop can send a message to users with details on how to opt-in for an airdrop. This avoids the need to blanket drop tokens to addresses that may not use ever them.