Parameters

transaction

object

REQUIRED

Unsigned transaction data, supplied as structured fields or a Bcs object. Simulation does not require signatures.

read_mask

object

Field mask for the simulation response, for example transaction.effects.status, transaction.transaction, and command_outputs. Omitted fields are not returned.

checks

string

Whether checks should be ENABLED (default) or DISABLED during simulation

do_gas_selection

boolean

Select gas payment automatically when true. With gas selection disabled and no gas payment, simulation uses mock gas; this does not prove that the sender can pay for execution.

Returns

transaction

object

Simulated execution data. Fields depend on read_mask; this is not an on-chain receipt.

transaction

object

Resolved transaction data. Its expiration may carry allowed proposers when server and client compatibility requirements are met.

effects

object

Simulation effects; selected by the read mask.

status

object

Execution outcome.

success

boolean

Whether simulated execution succeeded.

error

object

Execution error, present only when simulation fails.

events

object

Events, when requested and emitted.

balanceChanges

array

Balance changes, when requested.

objects

array

Objects, when requested.

commandOutputs

array

Per-command results, when selected by the read mask.

returnValues

array

Returned values, when present.

value

object

BCS-encoded value, when present.

json

any

JSON representation of the value, when available.

mutatedByRef

array

Values mutated by reference, when present.

suggestedGasPrice

string

Optional suggested gas price; returned only when applicable and selected by the read mask.

Request

1
# Set QN_SUI_GRPC_HOST to your endpoint hostname:9000 and QN_SUI_TOKEN to its token.
2
# The public docs demo does not require x-token authentication.
3
grpcurl -max-time 20 \
4
  -H "x-token: ${QN_SUI_TOKEN:-}" \
5
  -d '
6
{
7
  "transaction": {
8
    "sender": "0x0000000000000000000000000000000000000000000000000000000000000001",
9
    "kind": {
10
      "programmable_transaction": {
11
        "commands": [
12
          {
13
            "move_call": {
14
              "package": "0x2",
15
              "module": "tx_context",
16
              "function": "epoch"
17
            }
18
          }
19
        ]
20
      }
21
    }
22
  },
23
  "checks": "DISABLED",
24
  "do_gas_selection": false,
25
  "read_mask": {
26
    "paths": [
27
      "transaction.transaction",
28
      "transaction.effects.status",
29
      "command_outputs",
30
      "suggested_gas_price"
31
    ]
32
  }
33
}
34
' \
35
  "$QN_SUI_GRPC_HOST" \
36
  sui.rpc.v2.TransactionExecutionService/SimulateTransaction
37

1
# Set QN_SUI_GRPC_HOST to your endpoint hostname:9000 and QN_SUI_TOKEN to its token.
2
# The public docs demo does not require x-token authentication.
3
grpcurl -max-time 20 \
4
  -H "x-token: ${QN_SUI_TOKEN:-}" \
5
  -d '
6
{
7
  "transaction": {
8
    "sender": "0x0000000000000000000000000000000000000000000000000000000000000001",
9
    "kind": {
10
      "programmable_transaction": {
11
        "commands": [
12
          {
13
            "move_call": {
14
              "package": "0x2",
15
              "module": "tx_context",
16
              "function": "epoch"
17
            }
18
          }
19
        ]
20
      }
21
    }
22
  },
23
  "checks": "DISABLED",
24
  "do_gas_selection": false,
25
  "read_mask": {
26
    "paths": [
27
      "transaction.transaction",
28
      "transaction.effects.status",
29
      "command_outputs",
30
      "suggested_gas_price"
31
    ]
32
  }
33
}
34
' \
35
  "$QN_SUI_GRPC_HOST" \
36
  sui.rpc.v2.TransactionExecutionService/SimulateTransaction
37

1
package main
2

3
import (
4
	"context"
5
	"crypto/tls"
6
	"fmt"
7
	"log"
8
	"os"
9
	"time"
10

11
	"google.golang.org/grpc"
12
	"google.golang.org/grpc/credentials"
13
	"google.golang.org/grpc/metadata"
14
	"google.golang.org/protobuf/encoding/protojson"
15
	pb "sui-grpc/sui/rpc/v2" // Your generated protobuf package
16
)
17

18
func main() {
19
	conn, err := grpc.NewClient(os.Getenv("QN_SUI_GRPC_HOST"),
20
		grpc.WithTransportCredentials(credentials.NewTLS(&tls.Config{})))
21
	if err != nil {
22
		log.Fatal(err)
23
	}
24
	defer conn.Close()
25
	ctx, cancel := context.WithTimeout(context.Background(), 20*time.Second)
26
	defer cancel()
27
	if token := os.Getenv("QN_SUI_TOKEN"); token != "" {
28
		ctx = metadata.AppendToOutgoingContext(ctx, "x-token", token)
29
	}
30
	// Only advertise a version your client can decode; omit it for legacy behavior.
31
	if version := os.Getenv("SUI_CLIENT_PROTOCOL_VERSION"); version != "" {
32
		ctx = metadata.AppendToOutgoingContext(ctx, "x-sui-client-protocol-version", version)
33
	}
34
	// Unsigned simulation using mock gas; no transaction is submitted.
35
	request := new(pb.SimulateTransactionRequest)
36
	if err := protojson.Unmarshal([]byte(`
37
{
38
  "transaction": {
39
    "sender": "0x0000000000000000000000000000000000000000000000000000000000000001",
40
    "kind": {
41
      "programmable_transaction": {
42
        "commands": [
43
          {
44
            "move_call": {
45
              "package": "0x2",
46
              "module": "tx_context",
47
              "function": "epoch"
48
            }
49
          }
50
        ]
51
      }
52
    }
53
  },
54
  "checks": "DISABLED",
55
  "do_gas_selection": false,
56
  "read_mask": "transaction.transaction,transaction.effects.status,commandOutputs,suggestedGasPrice"
57
}
58
`), request); err != nil {
59
		log.Fatal(err)
60
	}
61
	response, err := pb.NewTransactionExecutionServiceClient(conn).SimulateTransaction(ctx, request)
62
	if err != nil {
63
		log.Fatal(err)
64
	}
65
	result, err := (protojson.MarshalOptions{Indent: "  "}).Marshal(response)
66
	if err != nil {
67
		log.Fatal(err)
68
	}
69
	fmt.Println(string(result))
70
}
71

1
package main
2

3
import (
4
	"context"
5
	"crypto/tls"
6
	"fmt"
7
	"log"
8
	"os"
9
	"time"
10

11
	"google.golang.org/grpc"
12
	"google.golang.org/grpc/credentials"
13
	"google.golang.org/grpc/metadata"
14
	"google.golang.org/protobuf/encoding/protojson"
15
	pb "sui-grpc/sui/rpc/v2" // Your generated protobuf package
16
)
17

18
func main() {
19
	conn, err := grpc.NewClient(os.Getenv("QN_SUI_GRPC_HOST"),
20
		grpc.WithTransportCredentials(credentials.NewTLS(&tls.Config{})))
21
	if err != nil {
22
		log.Fatal(err)
23
	}
24
	defer conn.Close()
25
	ctx, cancel := context.WithTimeout(context.Background(), 20*time.Second)
26
	defer cancel()
27
	if token := os.Getenv("QN_SUI_TOKEN"); token != "" {
28
		ctx = metadata.AppendToOutgoingContext(ctx, "x-token", token)
29
	}
30
	// Only advertise a version your client can decode; omit it for legacy behavior.
31
	if version := os.Getenv("SUI_CLIENT_PROTOCOL_VERSION"); version != "" {
32
		ctx = metadata.AppendToOutgoingContext(ctx, "x-sui-client-protocol-version", version)
33
	}
34
	// Unsigned simulation using mock gas; no transaction is submitted.
35
	request := new(pb.SimulateTransactionRequest)
36
	if err := protojson.Unmarshal([]byte(`
37
{
38
  "transaction": {
39
    "sender": "0x0000000000000000000000000000000000000000000000000000000000000001",
40
    "kind": {
41
      "programmable_transaction": {
42
        "commands": [
43
          {
44
            "move_call": {
45
              "package": "0x2",
46
              "module": "tx_context",
47
              "function": "epoch"
48
            }
49
          }
50
        ]
51
      }
52
    }
53
  },
54
  "checks": "DISABLED",
55
  "do_gas_selection": false,
56
  "read_mask": "transaction.transaction,transaction.effects.status,commandOutputs,suggestedGasPrice"
57
}
58
`), request); err != nil {
59
		log.Fatal(err)
60
	}
61
	response, err := pb.NewTransactionExecutionServiceClient(conn).SimulateTransaction(ctx, request)
62
	if err != nil {
63
		log.Fatal(err)
64
	}
65
	result, err := (protojson.MarshalOptions{Indent: "  "}).Marshal(response)
66
	if err != nil {
67
		log.Fatal(err)
68
	}
69
	fmt.Println(string(result))
70
}
71

1
import * as grpc from '@grpc/grpc-js';
2
import * as protoLoader from '@grpc/proto-loader';
3
import * as path from 'path';
4

5
const endpoint = process.env.QN_SUI_GRPC_HOST!; // Your endpoint hostname:9000
6
const token = process.env.QN_SUI_TOKEN;
7
const protoRoot = path.join(__dirname, 'protos/proto');
8
const definition = protoLoader.loadSync(
9
  path.join(protoRoot, 'sui/rpc/v2/transaction_execution_service.proto'),
10
  { keepCase: true, longs: String, enums: String, includeDirs: [protoRoot] },
11
);
12
const proto = grpc.loadPackageDefinition(definition) as any;
13
const client = new proto.sui.rpc.v2.TransactionExecutionService(
14
  endpoint, grpc.credentials.createSsl(),
15
);
16
const metadata = new grpc.Metadata();
17
if (token) metadata.set('x-token', token);
18
// Only advertise a version your client can decode; omit it for legacy behavior.
19
if (process.env.SUI_CLIENT_PROTOCOL_VERSION) {
20
  metadata.set('x-sui-client-protocol-version', process.env.SUI_CLIENT_PROTOCOL_VERSION);
21
}
22

23
// Unsigned simulation using mock gas; no transaction is submitted.
24
const request = {
25
  "transaction": {
26
    "sender": "0x0000000000000000000000000000000000000000000000000000000000000001",
27
    "kind": {
28
      "programmable_transaction": {
29
        "commands": [
30
          {
31
            "move_call": {
32
              "package": "0x2",
33
              "module": "tx_context",
34
              "function": "epoch"
35
            }
36
          }
37
        ]
38
      }
39
    }
40
  },
41
  "checks": "DISABLED",
42
  "do_gas_selection": false,
43
  "read_mask": {
44
    "paths": [
45
      "transaction.transaction",
46
      "transaction.effects.status",
47
      "command_outputs",
48
      "suggested_gas_price"
49
    ]
50
  }
51
};
52
client.SimulateTransaction(request, metadata, { deadline: Date.now() + 20000 },
53
  (error: grpc.ServiceError | null, response: any) => {
54
    if (error) {
55
      console.error(error);
56
      process.exitCode = 1;
57
    } else {
58
      console.log(JSON.stringify(response, null, 2));
59
    }
60
    client.close();
61
  },
62
);
63

1
import * as grpc from '@grpc/grpc-js';
2
import * as protoLoader from '@grpc/proto-loader';
3
import * as path from 'path';
4

5
const endpoint = process.env.QN_SUI_GRPC_HOST!; // Your endpoint hostname:9000
6
const token = process.env.QN_SUI_TOKEN;
7
const protoRoot = path.join(__dirname, 'protos/proto');
8
const definition = protoLoader.loadSync(
9
  path.join(protoRoot, 'sui/rpc/v2/transaction_execution_service.proto'),
10
  { keepCase: true, longs: String, enums: String, includeDirs: [protoRoot] },
11
);
12
const proto = grpc.loadPackageDefinition(definition) as any;
13
const client = new proto.sui.rpc.v2.TransactionExecutionService(
14
  endpoint, grpc.credentials.createSsl(),
15
);
16
const metadata = new grpc.Metadata();
17
if (token) metadata.set('x-token', token);
18
// Only advertise a version your client can decode; omit it for legacy behavior.
19
if (process.env.SUI_CLIENT_PROTOCOL_VERSION) {
20
  metadata.set('x-sui-client-protocol-version', process.env.SUI_CLIENT_PROTOCOL_VERSION);
21
}
22

23
// Unsigned simulation using mock gas; no transaction is submitted.
24
const request = {
25
  "transaction": {
26
    "sender": "0x0000000000000000000000000000000000000000000000000000000000000001",
27
    "kind": {
28
      "programmable_transaction": {
29
        "commands": [
30
          {
31
            "move_call": {
32
              "package": "0x2",
33
              "module": "tx_context",
34
              "function": "epoch"
35
            }
36
          }
37
        ]
38
      }
39
    }
40
  },
41
  "checks": "DISABLED",
42
  "do_gas_selection": false,
43
  "read_mask": {
44
    "paths": [
45
      "transaction.transaction",
46
      "transaction.effects.status",
47
      "command_outputs",
48
      "suggested_gas_price"
49
    ]
50
  }
51
};
52
client.SimulateTransaction(request, metadata, { deadline: Date.now() + 20000 },
53
  (error: grpc.ServiceError | null, response: any) => {
54
    if (error) {
55
      console.error(error);
56
      process.exitCode = 1;
57
    } else {
58
      console.log(JSON.stringify(response, null, 2));
59
    }
60
    client.close();
61
  },
62
);
63

1
import json
2
import os
3
import grpc
4
from google.protobuf.json_format import MessageToJson, ParseDict
5
from sui.rpc.v2 import transaction_execution_service_pb2 as pb
6
from sui.rpc.v2 import transaction_execution_service_pb2_grpc as services
7

8
endpoint = os.environ["QN_SUI_GRPC_HOST"]  # Your endpoint hostname:9000
9
metadata = []
10
if os.environ.get("QN_SUI_TOKEN"):
11
    metadata.append(("x-token", os.environ["QN_SUI_TOKEN"]))
12
# Only advertise a version your client can decode; omit it for legacy behavior.
13
if os.environ.get("SUI_CLIENT_PROTOCOL_VERSION"):
14
    metadata.append(("x-sui-client-protocol-version", os.environ["SUI_CLIENT_PROTOCOL_VERSION"]))
15

16
# Unsigned simulation using mock gas; no transaction is submitted.
17
request = ParseDict(json.loads(r'''
18
{
19
  "transaction": {
20
    "sender": "0x0000000000000000000000000000000000000000000000000000000000000001",
21
    "kind": {
22
      "programmable_transaction": {
23
        "commands": [
24
          {
25
            "move_call": {
26
              "package": "0x2",
27
              "module": "tx_context",
28
              "function": "epoch"
29
            }
30
          }
31
        ]
32
      }
33
    }
34
  },
35
  "checks": "DISABLED",
36
  "do_gas_selection": False,
37
  "read_mask": "transaction.transaction,transaction.effects.status,commandOutputs,suggestedGasPrice"
38
}
39
'''), pb.SimulateTransactionRequest())
40
with grpc.secure_channel(endpoint, grpc.ssl_channel_credentials()) as channel:
41
    client = services.TransactionExecutionServiceStub(channel)
42
    response = client.SimulateTransaction(request, metadata=metadata, timeout=20)
43
    print(MessageToJson(response))
44

1
import json
2
import os
3
import grpc
4
from google.protobuf.json_format import MessageToJson, ParseDict
5
from sui.rpc.v2 import transaction_execution_service_pb2 as pb
6
from sui.rpc.v2 import transaction_execution_service_pb2_grpc as services
7

8
endpoint = os.environ["QN_SUI_GRPC_HOST"]  # Your endpoint hostname:9000
9
metadata = []
10
if os.environ.get("QN_SUI_TOKEN"):
11
    metadata.append(("x-token", os.environ["QN_SUI_TOKEN"]))
12
# Only advertise a version your client can decode; omit it for legacy behavior.
13
if os.environ.get("SUI_CLIENT_PROTOCOL_VERSION"):
14
    metadata.append(("x-sui-client-protocol-version", os.environ["SUI_CLIENT_PROTOCOL_VERSION"]))
15

16
# Unsigned simulation using mock gas; no transaction is submitted.
17
request = ParseDict(json.loads(r'''
18
{
19
  "transaction": {
20
    "sender": "0x0000000000000000000000000000000000000000000000000000000000000001",
21
    "kind": {
22
      "programmable_transaction": {
23
        "commands": [
24
          {
25
            "move_call": {
26
              "package": "0x2",
27
              "module": "tx_context",
28
              "function": "epoch"
29
            }
30
          }
31
        ]
32
      }
33
    }
34
  },
35
  "checks": "DISABLED",
36
  "do_gas_selection": False,
37
  "read_mask": "transaction.transaction,transaction.effects.status,commandOutputs,suggestedGasPrice"
38
}
39
'''), pb.SimulateTransactionRequest())
40
with grpc.secure_channel(endpoint, grpc.ssl_channel_credentials()) as channel:
41
    client = services.TransactionExecutionServiceStub(channel)
42
    response = client.SimulateTransaction(request, metadata=metadata, timeout=20)
43
    print(MessageToJson(response))
44

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