user63817: Some company's, block explorers and payment processors offer a public API for feerate estimations. Is there a list of publicly available feerate estimation APIs?

user63817: I've listed some public feerate APIs by block explorers and payment processors below. Purposefully leaving out APIs from wallets, since they don't advertise their APIs. I leave out Bitcoin Core's estimatesmartfee RPC, which I don't consider public (as in reachable over the web by everyone).
The list is sorted lexicographically. Disclosure: This Q&A is based on a blog post by me.

bitcoiner.live API
URL: https://bitcoiner.live/api/fees/estimates/latest
Note: Estimates for confirmation in 1/2, 1, 2, 3, 6, 12 and 24 hours.
Unit: sat/vByte 

Bitgo API
URL: https://www.bitgo.com/api/v2/btc/tx/fee
Note: Estimates for different block targets based on current mempool.
Unit: sat/kB

Bitpay Insight API
URL: https://insight.bitpay.com/api/utils/estimatefee?nbBlocks=2,4,6
Note: Estimates for different block targets based on nbBlocks parameter.
Unit: BTC/kB

Blockchain.info API
URL: https://api.blockchain.info/mempool/fees
Note: Estimates for a regular and priority feerate are provided.
Unit: sat/Byte

Blockchair API
URL: https://api.blockchair.com/bitcoin/stats
Note: A single estimate for a feerate is provided.
Unit: sat/Byte

BlockCypher API
URL: https://api.blockcypher.com/v1/btc/main
Note: Estimates for a high, medium and low feerate are provided.
Unit: sat/kB

Blockstream.info API
URL: https://blockstream.info/api/fee-estimates
Note: Estimates for confirmation in 2, 3, 4, 6, 10, 20, 144, 504 and 1008 blocks.
Unit: sat/vByte

BTC.com API
URL: https://btc.com/service/fees/distribution
Note: A single estimate for a 'one block' feerate is provided.
Unit: sat/vByte

earn.com API
URL: https://bitcoinfees.earn.com/api/v1/fees/recommended
Note: Estimates for the fastest confirmation, a confirmation in half an hour and a hour are provided.
Unit: sat/vByte

63817: <p>Some company's, block explorers and payment processors offer a public API for feerate estimations. Is there a list of publicly available feerate estimation APIs?</p>
 63817: <p>I've listed some public feerate APIs by block explorers and payment processors below. Purposefully leaving out APIs from wallets, since they don't advertise their APIs. I leave out Bitcoin Core's <code>estimatesmartfee</code> RPC, which I don't consider public (<em>as in reachable over the web by everyone</em>).</p>

<p>The list is sorted lexicographically. Disclosure: This Q&amp;A is based on a <a href="https://b10c.me/A-list-of-public-feerate-estimator-APIs/" rel="nofollow noreferrer">blog post</a> by me.</p>

<hr>

<h3>bitcoiner.live API</h3>

<p>URL: <a href="https://bitcoiner.live/api/fees/estimates/latest" rel="nofollow noreferrer">https://bitcoiner.live/api/fees/estimates/latest</a><br>
Note: Estimates for confirmation in 1/2, 1, 2, 3, 6, 12 and 24 hours.<br>
Unit: <code>sat/vByte</code>  </p>

<hr>

<h3>Bitgo API</h3>

<p>URL: <a href="https://www.bitgo.com/api/v2/btc/tx/fee" rel="nofollow noreferrer">https://www.bitgo.com/api/v2/btc/tx/fee</a><br>
Note: Estimates for different block targets based on current mempool.<br>
Unit: <code>sat/kB</code></p>

<hr>

<h3>Bitpay Insight API</h3>

<p>URL: <a href="https://insight.bitpay.com/api/utils/estimatefee?nbBlocks=2,4,6" rel="nofollow noreferrer">https://insight.bitpay.com/api/utils/estimatefee?nbBlocks=2,4,6</a><br>
Note: Estimates for different block targets based on <code>nbBlocks</code> parameter.<br>
Unit: <code>BTC/kB</code></p>

<hr>

<h3>Blockchain.info API</h3>

<p>URL: <a href="https://api.blockchain.info/mempool/fees" rel="nofollow noreferrer">https://api.blockchain.info/mempool/fees</a><br>
Note: Estimates for a <em>regular</em> and <em>priority</em> feerate are provided.<br>
Unit: <code>sat/Byte</code></p>

<hr>

<h3>Blockchair API</h3>

<p>URL: <a href="https://api.blockchair.com/bitcoin/stats" rel="nofollow noreferrer">https://api.blockchair.com/bitcoin/stats</a><br>
Note: A single estimate for a feerate is provided.<br>
Unit: <code>sat/Byte</code></p>

<hr>

<h3>BlockCypher API</h3>

<p>URL: <a href="https://api.blockcypher.com/v1/btc/main" rel="nofollow noreferrer">https://api.blockcypher.com/v1/btc/main</a><br>
Note: Estimates for a <em>high</em>, <em>medium</em> and <em>low</em> feerate are provided.<br>
Unit: <strong><code>sat/kB</code></strong></p>

<hr>

<h3>Blockstream.info API</h3>

<p>URL: <a href="https://blockstream.info/api/fee-estimates" rel="nofollow noreferrer">https://blockstream.info/api/fee-estimates</a><br>
Note: Estimates for confirmation in 2, 3, 4, 6, 10, 20, 144, 504 and 1008 blocks.<br>
Unit: <code>sat/vByte</code></p>

<hr>

<h3>BTC.com API</h3>

<p>URL: <a href="https://btc.com/service/fees/distribution" rel="nofollow noreferrer">https://btc.com/service/fees/distribution</a><br>
Note: A single estimate for a 'one block' feerate is provided.<br>
Unit: <code>sat/vByte</code></p>

<hr>

<h3>earn.com API</h3>

<p>URL: <a href="https://bitcoinfees.earn.com/api/v1/fees/recommended" rel="nofollow noreferrer">https://bitcoinfees.earn.com/api/v1/fees/recommended</a><br>
Note: Estimates for the fastest confirmation, a confirmation in half an hour and a hour are provided.<br>
Unit: <code>sat/vByte</code></p>
