diff --git a/ethers/providers/jsonrpc/conversions.nim b/ethers/providers/jsonrpc/conversions.nim
index 568a431..7dc5866 100644
--- a/ethers/providers/jsonrpc/conversions.nim
+++ b/ethers/providers/jsonrpc/conversions.nim
@@ -1,6 +1,7 @@
 import std/json
 import std/strformat
 import std/strutils
+import std/typetraits
 import pkg/json_rpc/jsonmarshal
 import pkg/stew/byteutils
 import ../../basics
@@ -94,7 +95,7 @@ func fromJson*(json: JsonNode, name: string, result: var TransactionStatus) =
 func `%`*(status: TransactionStatus): JsonNode =
   %(status.int.toHex)
 
-# Transaction
+# PastTransaction
 
 proc expectFields(json: JsonNode, expectedFields: varargs[string]) =
   for fieldName in expectedFields:
@@ -123,4 +124,22 @@ func fromJson*(json: JsonNode, name: string, result: var PastTransaction) =
     v: UInt256.fromJson(json["v"], "v"),
     r: UInt256.fromJson(json["r"], "r"),
     s: UInt256.fromJson(json["s"], "s"),
-  )
\ No newline at end of file
+  )
+
+func `%`*(tx: PastTransaction): JsonNode =
+  %*{
+    "blockHash": tx.blockHash,
+    "blockNumber": tx.blockNumber,
+    "from": tx.sender,
+    "gas": tx.gas,
+    "gasPrice": tx.gasPrice,
+    "hash": tx.hash,
+    "input": tx.input,
+    "nonce": tx.nonce,
+    "to": tx.to,
+    "transactionIndex": tx.transactionIndex,
+    "value": tx.value,
+    "v": tx.v,
+    "r": tx.r,
+    "s": tx.s
+  }
diff --git a/testmodule/providers/jsonrpc/testConversions.nim b/testmodule/providers/jsonrpc/testConversions.nim
index 76abca4..6f47c11 100644
--- a/testmodule/providers/jsonrpc/testConversions.nim
+++ b/testmodule/providers/jsonrpc/testConversions.nim
@@ -1,8 +1,13 @@
+import std/strutils
 import std/unittest
 import pkg/ethers/provider
 import pkg/ethers/providers/jsonrpc/conversions
 import pkg/stew/byteutils
 
+func flatten(s: string): string =
+  s.replace(" ")
+    .replace("\n")
+
 suite "JSON Conversions":
 
   test "missing block number in Block isNone":
@@ -155,3 +160,41 @@ suite "JSON Conversions":
     check tx.v == 0x181bec.u256
     check tx.r == UInt256.fromBytesBE(hexToSeqByte("0x57ba18460934526333b80b0fea08737c363f3cd5fbec4a25a8a25e3e8acb362a"))
     check tx.s == UInt256.fromBytesBE(hexToSeqByte("0x33aa50bc8bd719b6b17ad0bf52006bf8943999198f2bf731eb33c118091000f2"))
+
+test "PastTransaction serializes correctly":
+  let tx = PastTransaction(
+    blockHash: BlockHash(array[32, byte].fromHex("0x595bffbe897e025ea2df3213c4cc52c3f3d69bc04b49011d558f1b0e70038922")),
+    blockNumber: 0x22e.u256,
+    sender: Address.init("0xe00b677c29ff8d8fe6068530e2bc36158c54dd34").get,
+    gas: 0x4d4bb.u256,
+    gasPrice: 0x3b9aca07.u256,
+    hash: TransactionHash(array[32, byte].fromHex("0xa31608907c338d6497b0c6ec81049d845c7d409490ebf78171f35143897ca790")),
+    input: hexToSeqByte("0x6368a471d26ff5c7f835c1a8203235e88846ce1a196d6e79df0eaedd1b8ed3deec2ae5c00000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000006000000000000000000000000000000000000000000000000000000000000000012a00000000000000000000000000000000000000000000000000000000000000"),
+    nonce: 0x3.u256,
+    to: Address.init("0x92f09aa59dccb892a9f5406ddd9c0b98f02ea57e").get,
+    transactionIndex: 0x3.u256,
+    value: 0.u256,
+    v: 0x181bec.u256,
+    r: UInt256.fromBytesBE(hexToSeqByte("0x57ba18460934526333b80b0fea08737c363f3cd5fbec4a25a8a25e3e8acb362a")),
+    s: UInt256.fromBytesBE(hexToSeqByte("0x33aa50bc8bd719b6b17ad0bf52006bf8943999198f2bf731eb33c118091000f2"))
+  )
+  let expected = """
+    {
+      "blockHash":"0x595bffbe897e025ea2df3213c4cc52c3f3d69bc04b49011d558f1b0e70038922",
+      "blockNumber":"0x22e",
+      "from":"0xe00b677c29ff8d8fe6068530e2bc36158c54dd34",
+      "gas":"0x4d4bb",
+      "gasPrice":"0x3b9aca07",
+      "hash":"0xa31608907c338d6497b0c6ec81049d845c7d409490ebf78171f35143897ca790",
+      "input":"0x6368a471d26ff5c7f835c1a8203235e88846ce1a196d6e79df0eaedd1b8ed3deec2ae5c00000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000006000000000000000000000000000000000000000000000000000000000000000012a00000000000000000000000000000000000000000000000000000000000000",
+      "nonce":"0x3",
+      "to":"0x92f09aa59dccb892a9f5406ddd9c0b98f02ea57e",
+      "transactionIndex":"0x3",
+      "value":"0x0",
+      "v":"0x181bec",
+      "r":"0x57ba18460934526333b80b0fea08737c363f3cd5fbec4a25a8a25e3e8acb362a",
+      "s":"0x33aa50bc8bd719b6b17ad0bf52006bf8943999198f2bf731eb33c118091000f2"
+    }""".flatten
+    # "type":"0x0",
+    # "chainId":"0xc0de4",
+  check $(%tx) == expected