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I don't quite understand this concept yet but is this term related to this question/answer?

Link: what is the role of relayer in 0x protocol?

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I believe you're talking about 2 different types of relayers. A relayer as a general term is a 3rd party that relays some information from one party to another.

In 0x, the relayers are collecting off-chain orders people send them, and relaying them to parties that request these orders to possibly fill.

When talking about meta-transactions, (e.g. a 3rd party submitting transactions), you have your account be a multisig, and you sign a message that the multisig can essentially execute as a transaction. After you sign it, you send the message to a relayer who bundles that message into an actual transaction. They then relay that transaction to a public node so the transaction can be mined.

The term works perfectly for 0x, because they are simply relaying information from one party to another, but it breaks down a bit for meta-transactions since instead of just relaying, they're wrapping the signed messages into transactions and submitting them to the network. However, I can't think of a better term for them right now, so relayers it is!

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