The latest articles on DEV Community by Chainsight (@chainsight). https://dev.to/chainsight https://media2.dev.to/dynamic/image/width=90,height=90,fit=cover,gravity=auto,format=auto/https:%2F%2Fdev-to-uploads.s3.us-east-2.amazonaws.com%2Fuploads%2Fuser%2Fprofile_image%2F4034929%2Fa8bcd8f5-d7b5-4ac2-b898-8152416fbaf7.png https://dev.to/chainsight en Chainsight Sun, 19 Jul 2026 08:00:57 +0000 https://dev.to/chainsight/how-to-track-crypto-whale-transactions-across-9-blockchains-with-python-5dlk https://dev.to/chainsight/how-to-track-crypto-whale-transactions-across-9-blockchains-with-python-5dlk <h2> Why Whale Tracking Matters </h2> <p>When a whale moves $50M of ETH, the market notices. Learning to detect these movements before the price reacts gives you an edge.</p> <p><strong>Current Market:</strong> Fear &amp; Greed Index at <strong>28/100</strong> (Fear)</p> <ul> <li> <strong>Bitcoin</strong> ($64,625.44) 📈 +1.1%</li> <li> <strong>Ethereum</strong> ($1,867.74) 📈 +1.2%</li> <li> <strong>Tether</strong> ($1.00) 📈 +0.0%</li> <li> <strong>BNB</strong> ($568.51) 📈 +0.2%</li> <li> <strong>USDC</strong> ($1.00) 📈 +0.0%</li> </ul> <h2> What the API Provides </h2> <p>The ChainSight API tracks whale transactions across 9 blockchains:</p> <div class="table-wrapper-paragraph"><table> <thead> <tr> <th>Chain</th> <th>Source</th> <th>Min Trackable</th> </tr> </thead> <tbody> <tr> <td>Ethereum</td> <td>Etherscan V2</td> <td>100 ETH</td> </tr> <tr> <td>Bitcoin</td> <td>Blockstream Mempool</td> <td>1 BTC</td> </tr> <tr> <td>BSC</td> <td>Etherscan V2</td> <td>1000 BNB</td> </tr> <tr> <td>Polygon</td> <td>Etherscan V2</td> <td>10000 MATIC</td> </tr> <tr> <td>Arbitrum, Base, OP, Avalanche</td> <td>Etherscan V2</td> <td>Varies</td> </tr> <tr> <td>Solana</td> <td>Solscan API</td> <td>100 SOL</td> </tr> </tbody> </table></div> <h2> Quick Start </h2> <div class="highlight js-code-highlight"> <pre class="highlight python"><code><span class="kn">import</span> <span class="n">httpx</span> <span class="n">API</span> <span class="o">=</span> <span class="sh">"</span><span class="s">https://chainsight-api.onrender.com</span><span class="sh">"</span> <span class="c1"># Get large ETH transactions </span><span class="n">resp</span> <span class="o">=</span> <span class="n">httpx</span><span class="p">.</span><span class="nf">get</span><span class="p">(</span><span class="sa">f</span><span class="sh">"</span><span class="si">{</span><span class="n">API</span><span class="si">}</span><span class="s">/v1/whales/chain/ethereum</span><span class="sh">"</span><span class="p">,</span> <span class="n">params</span><span class="o">=</span><span class="p">{</span><span class="sh">"</span><span class="s">min_value</span><span class="sh">"</span><span class="p">:</span> <span class="mi">100000</span><span class="p">})</span> <span class="k">for</span> <span class="n">tx</span> <span class="ow">in</span> <span class="n">resp</span><span class="p">.</span><span class="nf">json</span><span class="p">():</span> <span class="k">if</span> <span class="sh">"</span><span class="s">hash</span><span class="sh">"</span> <span class="ow">in</span> <span class="n">tx</span><span class="p">:</span> <span class="nf">print</span><span class="p">(</span><span class="sa">f</span><span class="sh">"</span><span class="s">🐋 </span><span class="si">{</span><span class="n">tx</span><span class="p">[</span><span class="sh">'</span><span class="s">value</span><span class="sh">'</span><span class="p">]</span><span class="si">}</span><span class="s"> ETH — </span><span class="si">{</span><span class="n">tx</span><span class="p">[</span><span class="sh">'</span><span class="s">from_address</span><span class="sh">'</span><span class="p">][</span><span class="si">:</span><span class="mi">12</span><span class="p">]</span><span class="si">}</span><span class="s">...</span><span class="sh">"</span><span class="p">)</span> </code></pre> </div> <h2> Build a Whale Alert Bot </h2> <div class="highlight js-code-highlight"> <pre class="highlight python"><code><span class="kn">import</span> <span class="n">httpx</span><span class="p">,</span> <span class="n">asyncio</span> <span class="n">API</span> <span class="o">=</span> <span class="sh">"</span><span class="s">https://chainsight-api.onrender.com</span><span class="sh">"</span> <span class="k">async</span> <span class="k">def</span> <span class="nf">monitor</span><span class="p">():</span> <span class="n">last_hash</span> <span class="o">=</span> <span class="sh">""</span> <span class="k">while</span> <span class="bp">True</span><span class="p">:</span> <span class="n">resp</span> <span class="o">=</span> <span class="n">httpx</span><span class="p">.</span><span class="nf">get</span><span class="p">(</span><span class="sa">f</span><span class="sh">"</span><span class="si">{</span><span class="n">API</span><span class="si">}</span><span class="s">/v1/whales/chain/ethereum?min_value=500000</span><span class="sh">"</span><span class="p">)</span> <span class="n">txs</span> <span class="o">=</span> <span class="n">resp</span><span class="p">.</span><span class="nf">json</span><span class="p">()</span> <span class="k">for</span> <span class="n">tx</span> <span class="ow">in</span> <span class="n">txs</span><span class="p">:</span> <span class="k">if</span> <span class="n">tx</span><span class="p">.</span><span class="nf">get</span><span class="p">(</span><span class="sh">"</span><span class="s">hash</span><span class="sh">"</span><span class="p">)</span> <span class="ow">and</span> <span class="n">tx</span><span class="p">[</span><span class="sh">"</span><span class="s">hash</span><span class="sh">"</span><span class="p">]</span> <span class="o">!=</span> <span class="n">last_hash</span><span class="p">:</span> <span class="nf">print</span><span class="p">(</span><span class="sa">f</span><span class="sh">"</span><span class="s">🚨 WHALE: </span><span class="si">{</span><span class="n">tx</span><span class="p">[</span><span class="sh">'</span><span class="s">value</span><span class="sh">'</span><span class="p">]</span><span class="si">}</span><span class="s"> ETH moved!</span><span class="sh">"</span><span class="p">)</span> <span class="n">last_hash</span> <span class="o">=</span> <span class="n">tx</span><span class="p">[</span><span class="sh">"</span><span class="s">hash</span><span class="sh">"</span><span class="p">]</span> <span class="k">await</span> <span class="n">asyncio</span><span class="p">.</span><span class="nf">sleep</span><span class="p">(</span><span class="mi">60</span><span class="p">)</span> <span class="n">asyncio</span><span class="p">.</span><span class="nf">run</span><span class="p">(</span><span class="nf">monitor</span><span class="p">())</span> </code></pre> </div> <h2> What You Can Build </h2> <ul> <li> <strong>Trading bots</strong> that react to whale movements</li> <li> <strong>Portfolio alerts</strong> when large wallets move</li> <li> <strong>Research dashboards</strong> tracking smart money</li> <li> <strong>Risk management</strong> tools detecting exchange outflows</li> </ul> <h2> Try It Free </h2> <p>The API offers a free tier with no credit card:<br> </p> <div class="highlight js-code-highlight"> <pre class="highlight shell"><code>curl <span class="s2">"https://chainsight-api.onrender.com/v1/whales/chain/ethereum?min_value=100000"</span> </code></pre> </div> <p>🔗 <a href="https://rapidapi.com/storbaz/api/chainsight" rel="noopener noreferrer">RapidAPI</a> | 🔗 <a href="https://github.com/storbaz/chainsight-api" rel="noopener noreferrer">GitHub</a></p> <p><em>ChainSight is open source and free. Built by a solo developer.</em></p> api crypto python tutorial Chainsight Sat, 18 Jul 2026 08:33:05 +0000 https://dev.to/chainsight/how-to-track-crypto-whale-transactions-across-9-blockchains-with-python-3f2b https://dev.to/chainsight/how-to-track-crypto-whale-transactions-across-9-blockchains-with-python-3f2b <h2> Why Whale Tracking Matters </h2> <p>When a whale moves $50M of ETH, the market notices. Learning to detect these movements before the price reacts gives you an edge.</p> <p><strong>Current Market:</strong> Fear &amp; Greed Index at <strong>25/100</strong> (Extreme Fear)</p> <ul> <li> <strong>Bitcoin</strong> ($63,966.72) 📈 +1.7%</li> <li> <strong>Ethereum</strong> ($1,847.21) 📈 +0.9%</li> <li> <strong>Tether</strong> ($1.00) 📈 +0.0%</li> <li> <strong>BNB</strong> ($568.09) 📈 +0.6%</li> <li> <strong>USDC</strong> ($1.00) 📉 -0.0%</li> </ul> <h2> What the API Provides </h2> <p>The ChainSight API tracks whale transactions across 9 blockchains:</p> <div class="table-wrapper-paragraph"><table> <thead> <tr> <th>Chain</th> <th>Source</th> <th>Min Trackable</th> </tr> </thead> <tbody> <tr> <td>Ethereum</td> <td>Etherscan V2</td> <td>100 ETH</td> </tr> <tr> <td>Bitcoin</td> <td>Blockstream Mempool</td> <td>1 BTC</td> </tr> <tr> <td>BSC</td> <td>Etherscan V2</td> <td>1000 BNB</td> </tr> <tr> <td>Polygon</td> <td>Etherscan V2</td> <td>10000 MATIC</td> </tr> <tr> <td>Arbitrum, Base, OP, Avalanche</td> <td>Etherscan V2</td> <td>Varies</td> </tr> <tr> <td>Solana</td> <td>Solscan API</td> <td>100 SOL</td> </tr> </tbody> </table></div> <h2> Quick Start </h2> <div class="highlight js-code-highlight"> <pre class="highlight python"><code><span class="kn">import</span> <span class="n">httpx</span> <span class="n">API</span> <span class="o">=</span> <span class="sh">"</span><span class="s">https://chainsight-api.onrender.com</span><span class="sh">"</span> <span class="c1"># Get large ETH transactions </span><span class="n">resp</span> <span class="o">=</span> <span class="n">httpx</span><span class="p">.</span><span class="nf">get</span><span class="p">(</span><span class="sa">f</span><span class="sh">"</span><span class="si">{</span><span class="n">API</span><span class="si">}</span><span class="s">/v1/whales/chain/ethereum</span><span class="sh">"</span><span class="p">,</span> <span class="n">params</span><span class="o">=</span><span class="p">{</span><span class="sh">"</span><span class="s">min_value</span><span class="sh">"</span><span class="p">:</span> <span class="mi">100000</span><span class="p">})</span> <span class="k">for</span> <span class="n">tx</span> <span class="ow">in</span> <span class="n">resp</span><span class="p">.</span><span class="nf">json</span><span class="p">():</span> <span class="k">if</span> <span class="sh">"</span><span class="s">hash</span><span class="sh">"</span> <span class="ow">in</span> <span class="n">tx</span><span class="p">:</span> <span class="nf">print</span><span class="p">(</span><span class="sa">f</span><span class="sh">"</span><span class="s">🐋 </span><span class="si">{</span><span class="n">tx</span><span class="p">[</span><span class="sh">'</span><span class="s">value</span><span class="sh">'</span><span class="p">]</span><span class="si">}</span><span class="s"> ETH — </span><span class="si">{</span><span class="n">tx</span><span class="p">[</span><span class="sh">'</span><span class="s">from_address</span><span class="sh">'</span><span class="p">][</span><span class="si">:</span><span class="mi">12</span><span class="p">]</span><span class="si">}</span><span class="s">...</span><span class="sh">"</span><span class="p">)</span> </code></pre> </div> <h2> Build a Whale Alert Bot </h2> <div class="highlight js-code-highlight"> <pre class="highlight python"><code><span class="kn">import</span> <span class="n">httpx</span><span class="p">,</span> <span class="n">asyncio</span> <span class="n">API</span> <span class="o">=</span> <span class="sh">"</span><span class="s">https://chainsight-api.onrender.com</span><span class="sh">"</span> <span class="k">async</span> <span class="k">def</span> <span class="nf">monitor</span><span class="p">():</span> <span class="n">last_hash</span> <span class="o">=</span> <span class="sh">""</span> <span class="k">while</span> <span class="bp">True</span><span class="p">:</span> <span class="n">resp</span> <span class="o">=</span> <span class="n">httpx</span><span class="p">.</span><span class="nf">get</span><span class="p">(</span><span class="sa">f</span><span class="sh">"</span><span class="si">{</span><span class="n">API</span><span class="si">}</span><span class="s">/v1/whales/chain/ethereum?min_value=500000</span><span class="sh">"</span><span class="p">)</span> <span class="n">txs</span> <span class="o">=</span> <span class="n">resp</span><span class="p">.</span><span class="nf">json</span><span class="p">()</span> <span class="k">for</span> <span class="n">tx</span> <span class="ow">in</span> <span class="n">txs</span><span class="p">:</span> <span class="k">if</span> <span class="n">tx</span><span class="p">.</span><span class="nf">get</span><span class="p">(</span><span class="sh">"</span><span class="s">hash</span><span class="sh">"</span><span class="p">)</span> <span class="ow">and</span> <span class="n">tx</span><span class="p">[</span><span class="sh">"</span><span class="s">hash</span><span class="sh">"</span><span class="p">]</span> <span class="o">!=</span> <span class="n">last_hash</span><span class="p">:</span> <span class="nf">print</span><span class="p">(</span><span class="sa">f</span><span class="sh">"</span><span class="s">🚨 WHALE: </span><span class="si">{</span><span class="n">tx</span><span class="p">[</span><span class="sh">'</span><span class="s">value</span><span class="sh">'</span><span class="p">]</span><span class="si">}</span><span class="s"> ETH moved!</span><span class="sh">"</span><span class="p">)</span> <span class="n">last_hash</span> <span class="o">=</span> <span class="n">tx</span><span class="p">[</span><span class="sh">"</span><span class="s">hash</span><span class="sh">"</span><span class="p">]</span> <span class="k">await</span> <span class="n">asyncio</span><span class="p">.</span><span class="nf">sleep</span><span class="p">(</span><span class="mi">60</span><span class="p">)</span> <span class="n">asyncio</span><span class="p">.</span><span class="nf">run</span><span class="p">(</span><span class="nf">monitor</span><span class="p">())</span> </code></pre> </div> <h2> What You Can Build </h2> <ul> <li> <strong>Trading bots</strong> that react to whale movements</li> <li> <strong>Portfolio alerts</strong> when large wallets move</li> <li> <strong>Research dashboards</strong> tracking smart money</li> <li> <strong>Risk management</strong> tools detecting exchange outflows</li> </ul> <h2> Try It Free </h2> <p>The API offers a free tier with no credit card:<br> </p> <div class="highlight js-code-highlight"> <pre class="highlight shell"><code>curl <span class="s2">"https://chainsight-api.onrender.com/v1/whales/chain/ethereum?min_value=100000"</span> </code></pre> </div> <p>🔗 <a href="https://rapidapi.com/storbaz/api/chainsight" rel="noopener noreferrer">RapidAPI</a> | 🔗 <a href="https://github.com/storbaz/chainsight-api" rel="noopener noreferrer">GitHub</a></p> <p><em>ChainSight is open source and free. Built by a solo developer.</em></p> api crypto python tutorial