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bch_qp3hvzy09lzcm46qm4cd 66e0acc0be snapshot: docs.riftenlabs.com/cauldron/ (28 pages) - author: Riften Labs 
Backup of Cauldron docs at snapshot time. Canonical source of truth:
  https://docs.riftenlabs.com/cauldron/

Includes: whitepaper, liquidity/swap/yield/wallets, developer resources,
knowledge base, and the full API section (bcmr, broadcast, cauldron,
contract-subscribe, ido, moria_v11, oracle, root, tokenbch, tokentoken).
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<article class="md-content__inner md-typeset">
<h1 id="other-use-cases">Other Use Cases</h1>
<p>The main use case of the Cauldron protocol is for trading cashtokens in a decentralized manner. However, the contract is very flexible and allows multiple other use cases. Here are a few use cases that have been identified.</p>
<h2 id="merchant-payment-in-any-token">Merchant payment in any token</h2>
<p>When a merchant wants to get paid in a token, Cauldron ca enable buyers to pay in tokens they don’t hold by utilising the contract.</p>
<pre class="mermaid"><code>flowchart LR
cIn[
Contract with
USDC
]
bchIn[
Payment with
BCH
]
tx[
Bitcoin Cash
Transaction
]
cOut[
Contract with
USDC
]
merchantOut[
Merchant
payment in
USDC
]
bchOut[
BCH change to
customer
]
cIn --&gt; tx
bchIn --&gt; tx
tx --&gt; cOut
tx --&gt; merchantOut
tx --&gt; bchOut
</code></pre>
<blockquote>
<p>Figure: Paying a merchant in USDC, without the user owning any USDC.</p>
</blockquote>
<p>For instance, a user with BCH can directly pay a merchant requesting USDC by engaging a Cauldron contract to perform the exchange within the transaction itself.</p>
<h2 id="pay-transaction-fee-with-token">Pay transaction fee with token</h2>
<p>Bitcoin Cash network fee has to be paid in Bitcoin Cash. When a wallet has tokens, but no BCH, it is possible to utilize the Cauldron protocol to pay the fee with a token.</p>
<p>This works by including a Cauldron contract in the transaction and sell tokens to it, in return taking enough BCH to cover fee.</p>
<pre class="mermaid"><code>flowchart LR
cIn[
Contract with
TOKEN/BCH
]
tokenIn[
Input with
TOKEN
]
tx[
Bitcoin Cash
Transaction
]
cOut[
Contract with
TOKEN/BCH
]
tokenOut[
Output with
TOKEN
]
cIn --&gt; tx
tokenIn --&gt; tx
tx --&gt; cOut
tx --&gt; tokenOut
</code></pre>
<h2 id="on-chain-price-oracle">On-chain Price Oracle</h2>
<p>By taking a Cauldron as input, it is possible to use it as a price oracle with introspection. By looking at the ratio between TOKEN and BCH in contracts, it is possible to calculate the market price of a token.</p>
<pre class="mermaid"><code>flowchart LR
cIn[
Contract with
TOKEN/BCH
]
c2In[
Smart Contract
using price
]
tx[
Bitcoin Cash
Transaction
]
cOut[
Contract with
TOKEN/BCH
]
c2Out[
Smart Contract
using price
]
c2In --&gt; tx
cIn --&gt; tx
tx --&gt; c2Out
tx --&gt; cOut
</code></pre>
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