diff --git a/Dockerfile b/Dockerfile
new file mode 100644
index 0000000..c560b35
--- /dev/null
+++ b/Dockerfile
@@ -0,0 +1,6 @@
+FROM node:alpine
+WORKDIR /app
+COPY . .
+RUN npm i
+CMD ["npm", "run", "start"]
+
diff --git a/api/companies.js b/api/companies.js
new file mode 100644
index 0000000..b1b373c
--- /dev/null
+++ b/api/companies.js
@@ -0,0 +1,44 @@
+const express = require('express');
+const router = express.Router();
+const { getConnection, getCompanies, getCompany, getCompanyShares } = require("../libs/mysql.js")
+
+router.get('/', async (req, res) => {
+  const connection = await getConnection()
+  const companies = await getCompanies(connection)
+  connection.end()
+
+  if (!companies[0]) {
+    return res.status(500).send({message: "There are no companies in the databse."})
+  }
+
+  return res.status(200).send(companies)
+});
+
+router.get('/:id', async (req, res) => {
+  const id = req.params.id
+  const connection = await getConnection()
+  const company = await getCompany(connection, id)
+  connection.end()
+
+  if (!company[0]) {
+    return res.status(500).send({message: "There are no company for that id."})
+  }
+
+  return res.status(200).send(company[0])
+});
+
+router.get('/:id/shares', async (req, res) => {
+  const id = req.params.id
+  const connection = await getConnection()
+  const shares = await getCompanyShares(connection, id)
+  connection.end()
+
+  if (!shares[0]) {
+    return res.status(500).send({message: "There are no shares for that company."})
+  }
+
+  return res.status(200).send(shares)
+});
+
+module.exports = router;
+
diff --git a/api/shareholders.js b/api/shareholders.js
index bcb0f8b..4b1ba26 100644
--- a/api/shareholders.js
+++ b/api/shareholders.js
@@ -1,6 +1,6 @@
 const express = require('express');
 const router = express.Router();
-const { getConnection, getShareholders } = require("../libs/mysql.js")
+const { getConnection, getShareholders, getShareholder, getShareholderShares } = require("../libs/mysql.js")
 
 router.get('/', async (req, res) => {
   const connection = await getConnection()
@@ -14,5 +14,31 @@ router.get('/', async (req, res) => {
   return res.status(200).send(shareholders)
 });
 
+router.get('/:id', async (req, res) => {
+  const id = req.params.id
+  const connection = await getConnection()
+  const shareholder = await getShareholder(connection, id)
+  connection.end()
+
+  if (!shareholder[0]) {
+    return res.status(500).send({message: "There are no shareholder for this id."})
+  }
+
+  return res.status(200).send(shareholder[0])
+});
+
+router.get('/:id/shares', async (req, res) => {
+  const id = req.params.id
+  const connection = await getConnection()
+  const shares = await getShareholderShares(connection, id)
+  connection.end()
+
+  if (!shares[0]) {
+    return res.status(500).send({message: "There are no shares for that shareholder id."})
+  }
+
+  return res.status(200).send(shares)
+});
+
 module.exports = router;
 
diff --git a/api/shares.js b/api/shares.js
index d919e2c..d65f75d 100644
--- a/api/shares.js
+++ b/api/shares.js
@@ -1,11 +1,12 @@
 const express = require('express');
 const router = express.Router();
-const { getConnection, getShares } = require("../libs/mysql.js")
+const { getConnection, getShares, getShare, getShareholder, setShareOwner, addTransaction, getCompany, addShare, setCompanyCapital, setShareholderCapital } = require("../libs/mysql.js")
 
 router.get('/', async (req, res) => {
   const connection = await getConnection()
   const shares = await getShares(connection)
   connection.end()
+
   if (!shares[0]) {
     return res.status(500).send({message: "There are no shares in the databse."})
   }
@@ -13,5 +14,64 @@ router.get('/', async (req, res) => {
   return res.status(200).send(shares)
 });
 
+router.get('/:id', async (req, res) => {
+  const id = req.params.id
+  const connection = await getConnection()
+  const share = await getShare(connection, id)
+  connection.end()
+
+  if (!share[0]) {
+    return res.status(500).send({message: "There are no share for that id."})
+  }
+
+  return res.status(200).send(share)
+});
+
+router.post('/buy', async (req, res) => {
+  const { buyer_id, share_id, price } = req.body
+  const connection = await getConnection()
+  const share = await getShare(connection, share_id)
+  const shareholder = await getShareholder(connection, buyer_id)
+
+  if (!share[0]) {
+    return res.status(500).send({message: "There are no share for that id."})
+  }
+
+  if (!shareholder[0]) {
+    return res.status(500).send({message: "There are no shareholder for that id."})
+  }
+
+  if (share[0].owner_id == buyer_id) {
+    return res.status(500).send({message: "This shareholder already owns that share."})
+  }
+
+  await addTransaction(connection, price, share[0].owner_id, buyer_id, share_id)
+  await setShareOwner(connection, share_id, buyer_id)
+  if (share[0].owner != -1) {
+    const seller = await getShareholder(connection, share[0].owner_id)
+    await setShareholderCapital(connection, share[0].owner_id, seller[0].capital + price)
+  }
+  await setShareholderCapital(connection, buyer_id, shareholder[0].capital - price)
+  connection.end()
+
+  return res.status(200).send({ message: "Success." })
+});
+
+router.post('/emit', async (req, res) => {
+  const { company_id, price } = req.body
+  const connection = await getConnection()
+  const company = await getCompany(connection, company_id)
+
+  if (!company[0]) {
+    return res.status(500).send({message: "There are no company for that id."})
+  }
+
+  await addShare(connection, price, company_id)
+  await setCompanyCapital(connection, company_id, company[0].capital + price)
+  connection.end()
+
+  return res.status(200).send({ message: "Success." })
+});
+
 module.exports = router;
 
diff --git a/docker-compose.yml b/docker-compose.yml
new file mode 100644
index 0000000..32b48bb
--- /dev/null
+++ b/docker-compose.yml
@@ -0,0 +1,9 @@
+services:
+  api:
+    build:
+      context: .
+      dockerfile: Dockerfile 
+    container_name: api
+    restart: always
+    ports:
+      - 80:3000
diff --git a/libs/mysql.js b/libs/mysql.js
index 8fcaba9..98d93e1 100644
--- a/libs/mysql.js
+++ b/libs/mysql.js
@@ -23,6 +23,76 @@ function getShares(connection) {
   });
 }
 
+function getShare(connection, id) {
+  return new Promise((resolve, reject) => {
+    connection.query(
+      `SELECT * FROM Share WHERE id = ${id}`,
+      (error, result) => {
+        if (error) {
+          throw(new Error(error));
+        }
+        resolve(result);
+      }
+    );
+  });
+}
+
+function getShareholderShares(connection, owner_id) {
+  return new Promise((resolve, reject) => {
+    connection.query(
+      `SELECT * FROM Share WHERE owner_id = ${owner_id}`,
+      (error, result) => {
+        if (error) {
+          throw(new Error(error));
+        }
+        resolve(result);
+      }
+    );
+  });
+}
+
+function getCompanyShares(connection, id) {
+  return new Promise((resolve, reject) => {
+    connection.query(
+      `SELECT * FROM Share WHERE company_id = ${id}`,
+      (error, result) => {
+        if (error) {
+          throw(new Error(error));
+        }
+        resolve(result);
+      }
+    );
+  });
+}
+
+function setShareOwner(connection, share_id, owner_id) {
+  return new Promise((resolve, reject) => {
+    connection.query(
+      `UPDATE Share SET owner_id = ${owner_id} WHERE id = ${share_id}`,
+      (error, result) => {
+        if (error) {
+          throw(new Error(error));
+        }
+        resolve(result);
+      }
+    );
+  });
+}
+
+function addShare(connection, price, company_id) {
+  return new Promise((resolve, reject) => {
+    connection.query(
+      `INSERT INTO Share (price, owner_id, company_id) VALUES (${price}, -1, ${company_id})`,
+      (error, result) => {
+        if (error) {
+          throw(new Error(error));
+        }
+        resolve(result);
+      }
+    );
+  });
+}
+
 function getShareholders(connection) {
   return new Promise((resolve, reject) => {
     connection.query(
@@ -37,11 +107,108 @@ function getShareholders(connection) {
   });
 }
 
+function getShareholder(connection, id) {
+  return new Promise((resolve, reject) => {
+    connection.query(
+      `SELECT * FROM Shareholder WHERE id = ${id}`,
+      (error, result) => {
+        if (error) {
+          throw(new Error(error));
+        }
+        resolve(result);
+      }
+    );
+  });
+}
+
+function setShareholderCapital(connection, id, capital) {
+  return new Promise((resolve, reject) => {
+    connection.query(
+      `UPDATE Shareholder SET capital = ${capital} WHERE id = ${id}`,
+      (error, result) => {
+        if (error) {
+          throw(new Error(error));
+        }
+        resolve(result);
+      }
+    );
+  });
+}
+
+function getCompanies(connection) {
+  return new Promise((resolve, reject) => {
+    connection.query(
+      `SELECT * FROM Company`,
+      (error, result) => {
+        if (error) {
+          throw(new Error(error));
+        }
+        resolve(result);
+      }
+    );
+  });
+}
+
+function getCompany(connection, id) {
+  return new Promise((resolve, reject) => {
+    connection.query(
+      `SELECT * FROM Company WHERE id = ${id}`,
+      (error, result) => {
+        if (error) {
+          throw(new Error(error));
+        }
+        resolve(result);
+      }
+    );
+  });
+}
+
+function setCompanyCapital(connection, id, capital ) {
+  return new Promise((resolve, reject) => {
+    connection.query(
+      `UPDATE Company SET capital = ${capital} WHERE id = ${id}`,
+      (error, result) => {
+        if (error) {
+          throw(new Error(error));
+        }
+        resolve(result);
+      }
+    );
+  });
+}
+
+function addTransaction(connection, price, seller_id, buyer_id, share_id) {
+  return new Promise((resolve, reject) => {
+    connection.query(
+      `INSERT INTO Transaction (sell_price, seller_id, buyer_id, share_id) VALUES (${price}, ${seller_id}, ${buyer_id}, ${share_id})`,
+      (error, result) => {
+        if (error) {
+          throw(new Error(error));
+        }
+        resolve(result);
+      }
+    );
+  });
+}
+
 module.exports = {
   getConnection,
 
   getShares,
+  getShare,
+  getShareholderShares,
+  getCompanyShares,
+  setShareOwner,
+  addShare,
 
   getShareholders,
+  getShareholder,
+  setShareholderCapital,
+
+  getCompanies,
+  getCompany,
+  setCompanyCapital,
+
+  addTransaction,
 }