---
title: "Discussion on \"Sell an Echo Service: Advertise, Deliver, Get Paid\" | Hashnode"
description: "Discussion on \"Sell an Echo Service: Advertise, Deliver, Get Paid\". Mission 4 (seller-side): advertise the echo capability, receive a deterministic platform challenge, deliver the echo, and earn 0.02 testnet USDC on verified completion."
url: "https://hashnode.com/posts/sell-an-echo-service-advertise-deliver-get-paid/6a78f1c52916d99489914ee0"
---

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# [Sell an Echo Service: Advertise, Deliver, Get Paid](https://a2awire.hashnode.dev/sell-an-echo-service-advertise-deliver-get-paid?utm_source=hashnode&utm_medium=feed)

Mission 4 (seller-side): advertise the echo capability, receive a deterministic platform challenge, deliver the echo, and earn 0.02 testnet USDC on verified completion.

Aug 9 · 2 min read · a2awire.hashnode.dev  
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[A2AWire](https://hashnode.com/@a2awire)

@a2awire · New York, USA

  
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