diff --git a/packages-cache/@emurgo-cardano-serialization-lib-nodejs-5.0.0-rc.0.tgz b/packages-cache/@emurgo-cardano-serialization-lib-nodejs-5.0.0-rc.0.tgz
new file mode 100644
index 00000000..bec4194c
Binary files /dev/null and b/packages-cache/@emurgo-cardano-serialization-lib-nodejs-5.0.0-rc.0.tgz differ
diff --git a/packages-cache/@types-temp-write-4.0.0.tgz b/packages-cache/@types-temp-write-4.0.0.tgz
new file mode 100644
index 00000000..4e899091
Binary files /dev/null and b/packages-cache/@types-temp-write-4.0.0.tgz differ
diff --git a/packages-cache/temp-dir-1.0.0.tgz b/packages-cache/temp-dir-1.0.0.tgz
new file mode 100644
index 00000000..3458eb0e
Binary files /dev/null and b/packages-cache/temp-dir-1.0.0.tgz differ
diff --git a/packages-cache/temp-write-4.0.0.tgz b/packages-cache/temp-write-4.0.0.tgz
new file mode 100644
index 00000000..eda94c15
Binary files /dev/null and b/packages-cache/temp-write-4.0.0.tgz differ
diff --git a/packages/api-cardano-db-hasura/package.json b/packages/api-cardano-db-hasura/package.json
index 3b2ab965..11a00e8f 100644
--- a/packages/api-cardano-db-hasura/package.json
+++ b/packages/api-cardano-db-hasura/package.json
@@ -33,6 +33,7 @@
   ],
   "dependencies": {
     "@cardano-graphql/util": "3.1.0",
+    "@emurgo/cardano-serialization-lib-nodejs": "^5.0.0-rc.0",
     "@graphql-tools/delegate": "^6.0.10",
     "@graphql-tools/schema": "^6.0.9",
     "@graphql-tools/wrap": "^6.0.9",
@@ -51,6 +52,7 @@
     "pg": "^8.5.1",
     "pg-listen": "^1.6.0",
     "set-interval-async": "^1.0.33",
+    "temp-write": "^4.0.0",
     "ts-log": "^2.2.3"
   },
   "devDependencies": {
@@ -62,6 +64,7 @@
     "@types/node": "^14.0.13",
     "@types/pg": "^7.14.4",
     "@types/set-interval-async": "^1.0.0",
+    "@types/temp-write": "^4.0.0",
     "shx": "^0.3.2",
     "typescript": "^3.9.5"
   }
diff --git a/packages/api-cardano-db-hasura/schema.graphql b/packages/api-cardano-db-hasura/schema.graphql
index 47479d04..16fe505b 100644
--- a/packages/api-cardano-db-hasura/schema.graphql
+++ b/packages/api-cardano-db-hasura/schema.graphql
@@ -1,4 +1,5 @@
 schema {
+  mutation: Mutation
   query: Query
 }
 
@@ -16,6 +17,11 @@ scalar Timestamp
 scalar URL
 scalar VRFVerificationKey
 
+type Mutation {
+  # Submit a signed transaction to the network
+  submitTransaction (transaction: String!): TransactionSubmitResponse!
+}
+
 type Query {
   activeStake (
     limit: Int
@@ -1044,6 +1050,10 @@ type TransactionOutput_sum_fields {
   value: String
 }
 
+type TransactionSubmitResponse {
+  hash: String!
+}
+
 type Block {
   # Genesis block does not belong to the 0th epoch, therefore it could be null
   epoch: Epoch
diff --git a/packages/api-cardano-db-hasura/src/CardanoCli.ts b/packages/api-cardano-db-hasura/src/CardanoCli.ts
index 2e43d42d..1eab2fb6 100644
--- a/packages/api-cardano-db-hasura/src/CardanoCli.ts
+++ b/packages/api-cardano-db-hasura/src/CardanoCli.ts
@@ -2,7 +2,7 @@ import { exec } from 'child_process'
 import { Genesis, ShelleyProtocolParams } from './graphql_types'
 import { Config } from './Config'
 import { LedgerState } from './CardanoNodeClient'
-import { knownEras } from '@cardano-graphql/util'
+import { knownEras, capitalizeFirstChar } from '@cardano-graphql/util'
 
 export interface CardanoCliTip {
   blockNo: number,
@@ -14,14 +14,15 @@ export type ProtocolParams = ShelleyProtocolParams
 const isEraMismatch = (errorMessage: string, era: string): boolean => {
   return errorMessage.includes('EraMismatch') ||
     errorMessage.includes(
-      `The attempted local state query does not support the ${era.charAt(0).toUpperCase().concat(era.slice(1))} protocol`
+      `The attempted local state query does not support the ${capitalizeFirstChar(era)} protocol`
     )
 }
 
 export interface CardanoCli {
   getLedgerState(): Promise<LedgerState>,
   getProtocolParams(): Promise<ProtocolParams>,
-  getTip(): Promise<CardanoCliTip>
+  getTip(): Promise<CardanoCliTip>,
+  submitTransaction(filePath: string): Promise<void>
 }
 
 export function createCardanoCli (
@@ -75,6 +76,19 @@ export function createCardanoCli (
         withEraFlag: true
       }
     ),
-    getTip: () => query<CardanoCliTip>('tip')
+    getTip: () => query<CardanoCliTip>('tip'),
+    submitTransaction: (filePath) => {
+      return new Promise((resolve, reject) => {
+        exec(
+          `${cardanoCliPath} transaction submit --tx-file ${filePath} ${networkArg}`,
+          (error, _stdout, stderr) => {
+            if (error !== null || stderr.toString() !== '') {
+              return reject(new Error(stderr.toString()))
+            }
+            return resolve()
+          }
+        )
+      })
+    }
   }
 }
diff --git a/packages/api-cardano-db-hasura/src/CardanoNodeClient.ts b/packages/api-cardano-db-hasura/src/CardanoNodeClient.ts
index 4eff4f0c..25b451b8 100644
--- a/packages/api-cardano-db-hasura/src/CardanoNodeClient.ts
+++ b/packages/api-cardano-db-hasura/src/CardanoNodeClient.ts
@@ -1,9 +1,11 @@
 import { CardanoCli } from './CardanoCli'
 import fs from 'fs-extra'
-import { AssetSupply } from './graphql_types'
+import { AssetSupply, Transaction } from './graphql_types'
 import pRetry from 'p-retry'
-import util, { DataFetcher } from '@cardano-graphql/util'
+import util, { DataFetcher, knownEras } from '@cardano-graphql/util'
+import tempWrite from 'temp-write'
 import { dummyLogger, Logger } from 'ts-log'
+import { getHashOfSignedTransaction } from './util'
 
 export type LedgerState = {
   accountState: {
@@ -15,6 +17,23 @@ export type LedgerState = {
   }
 }
 
+const fileTypeFromEra = (era: string) => {
+  switch (era) {
+    case 'mary' :
+      return 'Tx MaryEra'
+    case 'allegra' :
+      return 'Tx AllegraEra'
+    case 'shelley' :
+      return 'TxSignedShelley'
+    default :
+      throw new Error(`Transaction not submitted. ${era} era not supported.`)
+  }
+}
+
+const isEraMismatch = (errorMessage: string): boolean =>
+  errorMessage.includes('DecoderErrorDeserialiseFailure') ||
+  errorMessage.includes('The era of the node and the tx do not match')
+
 export class CardanoNodeClient {
   readonly networkParams: string[]
   public adaCirculatingSupply: AssetSupply['circulating']
@@ -79,4 +98,26 @@ export class CardanoNodeClient {
   public async shutdown () {
     await this.ledgerStateFetcher.shutdown()
   }
+
+  public async submitTransaction (transaction: string): Promise<Transaction['hash']> {
+    for (const era of knownEras) {
+      const filePath = await tempWrite(`{
+        "type": "${fileTypeFromEra(era)}",
+        "description": "",
+        "cborHex": "${transaction}"
+      }`)
+      const hash = getHashOfSignedTransaction(transaction)
+      try {
+        await this.cardanoCli.submitTransaction(filePath)
+        this.logger.info('submitTransaction', { module: 'CardanoNodeClient', hash: hash })
+        return hash
+      } catch (error) {
+        if (!isEraMismatch(error.message)) {
+          throw error
+        }
+      } finally {
+        await fs.unlink(filePath)
+      }
+    }
+  }
 }
diff --git a/packages/api-cardano-db-hasura/src/example_queries/transactions/submitTransaction.graphql b/packages/api-cardano-db-hasura/src/example_queries/transactions/submitTransaction.graphql
new file mode 100644
index 00000000..17820fcd
--- /dev/null
+++ b/packages/api-cardano-db-hasura/src/example_queries/transactions/submitTransaction.graphql
@@ -0,0 +1,5 @@
+mutation submitTransaction(
+    $transaction: String!
+) {
+    submitTransaction(transaction: $transaction)
+}
diff --git a/packages/api-cardano-db-hasura/src/executableSchema.ts b/packages/api-cardano-db-hasura/src/executableSchema.ts
index 07f9301a..92251c9f 100644
--- a/packages/api-cardano-db-hasura/src/executableSchema.ts
+++ b/packages/api-cardano-db-hasura/src/executableSchema.ts
@@ -45,6 +45,13 @@ export async function buildSchema (
   }
   return makeExecutableSchema({
     resolvers: Object.assign({}, scalarResolvers, {
+      Mutation: {
+        submitTransaction: async (_root, args) => {
+          await throwIfNotInCurrentEra('submitTransaction')
+          const hash = await cardanoNodeClient.submitTransaction(args.transaction)
+          return { hash }
+        }
+      },
       PaymentAddress: {
         summary: async (parent, args) => {
           try {
diff --git a/packages/api-cardano-db-hasura/src/util.ts b/packages/api-cardano-db-hasura/src/util.ts
index be658143..72c6b7b0 100644
--- a/packages/api-cardano-db-hasura/src/util.ts
+++ b/packages/api-cardano-db-hasura/src/util.ts
@@ -1,3 +1,4 @@
+import CardanoWasm from '@emurgo/cardano-serialization-lib-nodejs'
 import { Config } from './Config'
 import fs from 'fs-extra'
 import path from 'path'
@@ -9,3 +10,10 @@ export async function readSecrets (rootDir: string): Promise<Partial<Config['db'
     user: (await fs.readFile(path.join(rootDir, 'postgres_user'), 'utf8')).toString()
   }
 }
+
+export function getHashOfSignedTransaction (signedTransaction: string): string {
+  const signedTransactionBytes = Buffer.from(signedTransaction, 'hex')
+  const parsed = CardanoWasm.Transaction.from_bytes(signedTransactionBytes)
+  const hashBuffer = parsed && parsed.body() && Buffer.from(CardanoWasm.hash_transaction(parsed.body()).to_bytes())
+  return hashBuffer.toString('hex')
+}
diff --git a/packages/util/src/index.ts b/packages/util/src/index.ts
index 029c2734..b8c90d09 100644
--- a/packages/util/src/index.ts
+++ b/packages/util/src/index.ts
@@ -3,6 +3,7 @@ import { loadQueryNode } from './queryNodeLoading'
 import * as scalars from './scalars'
 export * from './data_fetching'
 export * from './knownEras'
+export * from './stringModifiers'
 
 export default {
   onFailedAttemptFor,
diff --git a/packages/util/src/stringModifiers.ts b/packages/util/src/stringModifiers.ts
new file mode 100644
index 00000000..d02f9784
--- /dev/null
+++ b/packages/util/src/stringModifiers.ts
@@ -0,0 +1,2 @@
+
+export const capitalizeFirstChar = (word: string): string => word.charAt(0).toUpperCase().concat(word.slice(1))
diff --git a/yarn.lock b/yarn.lock
index 18852405..311abc2a 100644
--- a/yarn.lock
+++ b/yarn.lock
@@ -574,6 +574,11 @@
     exec-sh "^0.3.2"
     minimist "^1.2.0"
 
+"@emurgo/cardano-serialization-lib-nodejs@^5.0.0-rc.0":
+  version "5.0.0-rc.0"
+  resolved "https://registry.yarnpkg.com/@emurgo/cardano-serialization-lib-nodejs/-/cardano-serialization-lib-nodejs-5.0.0-rc.0.tgz#da6e7679ee83e467adfc78c2789b2a5129f7f6b1"
+  integrity sha512-CVd5YHVIsxiokJTYnyZunzr8jaeuEMVb83Jjt4j0OTNJJfp3ReV0ZIvGsoGJUP2K+07nT8xWnHDEDrMH97ZIkQ==
+
 "@graphql-codegen/cli@^1.15.2":
   version "1.16.2"
   resolved "https://registry.yarnpkg.com/@graphql-codegen/cli/-/cli-1.16.2.tgz#ff92e5e6813a404616d7504500be26ff88b7092d"
@@ -1699,6 +1704,13 @@
   resolved "https://registry.yarnpkg.com/@types/strip-json-comments/-/strip-json-comments-0.0.30.tgz#9aa30c04db212a9a0649d6ae6fd50accc40748a1"
   integrity sha512-7NQmHra/JILCd1QqpSzl8+mJRc8ZHz3uDm8YV1Ks9IhK0epEiTw8aIErbvH9PI+6XbqhyIQy3462nEsn7UVzjQ==
 
+"@types/temp-write@^4.0.0":
+  version "4.0.0"
+  resolved "https://registry.yarnpkg.com/@types/temp-write/-/temp-write-4.0.0.tgz#983237bb6dbcac883137dba8189b8c6177e8a04d"
+  integrity sha512-BNcDNG/ujXmzR49TeVxcWMbglOO55YQbe1ij3LE6WoZdLtZvclSEl5GAmmlfsr0Y5kM9mLIE1wk3r3pzQz62gQ==
+  dependencies:
+    temp-write "*"
+
 "@types/through@*":
   version "0.0.30"
   resolved "https://registry.yarnpkg.com/@types/through/-/through-0.0.30.tgz#e0e42ce77e897bd6aead6f6ea62aeb135b8a3895"
@@ -8676,6 +8688,22 @@ tdigest@^0.1.1:
   dependencies:
     bintrees "1.0.1"
 
+temp-dir@^1.0.0:
+  version "1.0.0"
+  resolved "https://registry.yarnpkg.com/temp-dir/-/temp-dir-1.0.0.tgz#0a7c0ea26d3a39afa7e0ebea9c1fc0bc4daa011d"
+  integrity sha1-CnwOom06Oa+n4OvqnB/AvE2qAR0=
+
+temp-write@*, temp-write@^4.0.0:
+  version "4.0.0"
+  resolved "https://registry.yarnpkg.com/temp-write/-/temp-write-4.0.0.tgz#cd2e0825fc826ae72d201dc26eef3bf7e6fc9320"
+  integrity sha512-HIeWmj77uOOHb0QX7siN3OtwV3CTntquin6TNVg6SHOqCP3hYKmox90eeFOGaY1MqJ9WYDDjkyZrW6qS5AWpbw==
+  dependencies:
+    graceful-fs "^4.1.15"
+    is-stream "^2.0.0"
+    make-dir "^3.0.0"
+    temp-dir "^1.0.0"
+    uuid "^3.3.2"
+
 terminal-link@^2.0.0:
   version "2.1.1"
   resolved "https://registry.yarnpkg.com/terminal-link/-/terminal-link-2.1.1.tgz#14a64a27ab3c0df933ea546fba55f2d078edc994"