Console

POST/cosmos/tx/v1beta1/simulate

https://rest-babylon-mainnet.nodit.io/cosmos/tx/v1beta1/simulate

Simulate simulates executing a transaction for estimating gas usage.

Request Body
bodyobject

TxBody is the body of a transaction that all signers sign over.

messagesobject[]

messages is a list of messages to be executed. The required signers of those messages define the number and order of elements in AuthInfo's signer_infos and Tx's signatures. Each required signer address is added to the list only the first time it occurs. By convention, the first required signer (usually from the first message) is referred to as the primary signer and pays the fee for the whole transaction.

type_urlstring

A URL/resource name that uniquely identifies the type of the serialized protocol buffer message. This string must contain at least one "/" character. The last segment of the URL's path must represent the fully qualified name of the type (as in path/google.protobuf.Duration). The name should be in a canonical form (e.g., leading "." is not accepted).

In practice, teams usually precompile into the binary all types that they expect it to use in the context of Any. However, for URLs which use the scheme http, https, or no scheme, one can optionally set up a type server that maps type URLs to message definitions as follows:

  • If no scheme is provided, https is assumed.
  • An HTTP GET on the URL must yield a [google.protobuf.Type][] value in binary format, or produce an error.
  • Applications are allowed to cache lookup results based on the URL, or have them precompiled into a binary to avoid any lookup. Therefore, binary compatibility needs to be preserved on changes to types. (Use versioned type names to manage breaking changes.)

Note: this functionality is not currently available in the official protobuf release, and it is not used for type URLs beginning with type.googleapis.com.

Schemes other than http, https (or the empty scheme) might be used with implementation specific semantics.

valuestring (byte)

Must be a valid serialized protocol buffer of the above specified type.

memostring

memo is any arbitrary note/comment to be added to the transaction. WARNING: in clients, any publicly exposed text should not be called memo, but should be called note instead (see https://github.com/cosmos/cosmos-sdk/issues/9122).

timeout_heightstring (uint64)
extension_optionsobject[]
type_urlstring

A URL/resource name that uniquely identifies the type of the serialized protocol buffer message. This string must contain at least one "/" character. The last segment of the URL's path must represent the fully qualified name of the type (as in path/google.protobuf.Duration). The name should be in a canonical form (e.g., leading "." is not accepted).

In practice, teams usually precompile into the binary all types that they expect it to use in the context of Any. However, for URLs which use the scheme http, https, or no scheme, one can optionally set up a type server that maps type URLs to message definitions as follows:

  • If no scheme is provided, https is assumed.
  • An HTTP GET on the URL must yield a [google.protobuf.Type][] value in binary format, or produce an error.
  • Applications are allowed to cache lookup results based on the URL, or have them precompiled into a binary to avoid any lookup. Therefore, binary compatibility needs to be preserved on changes to types. (Use versioned type names to manage breaking changes.)

Note: this functionality is not currently available in the official protobuf release, and it is not used for type URLs beginning with type.googleapis.com.

Schemes other than http, https (or the empty scheme) might be used with implementation specific semantics.

valuestring (byte)

Must be a valid serialized protocol buffer of the above specified type.

non_critical_extension_optionsobject[]
type_urlstring

A URL/resource name that uniquely identifies the type of the serialized protocol buffer message. This string must contain at least one "/" character. The last segment of the URL's path must represent the fully qualified name of the type (as in path/google.protobuf.Duration). The name should be in a canonical form (e.g., leading "." is not accepted).

In practice, teams usually precompile into the binary all types that they expect it to use in the context of Any. However, for URLs which use the scheme http, https, or no scheme, one can optionally set up a type server that maps type URLs to message definitions as follows:

  • If no scheme is provided, https is assumed.
  • An HTTP GET on the URL must yield a [google.protobuf.Type][] value in binary format, or produce an error.
  • Applications are allowed to cache lookup results based on the URL, or have them precompiled into a binary to avoid any lookup. Therefore, binary compatibility needs to be preserved on changes to types. (Use versioned type names to manage breaking changes.)

Note: this functionality is not currently available in the official protobuf release, and it is not used for type URLs beginning with type.googleapis.com.

Schemes other than http, https (or the empty scheme) might be used with implementation specific semantics.

valuestring (byte)

Must be a valid serialized protocol buffer of the above specified type.

auth_infoobject

AuthInfo describes the fee and signer modes that are used to sign a transaction.

signer_infosobject[]

signer_infos defines the signing modes for the required signers. The number and order of elements must match the required signers from TxBody's messages. The first element is the primary signer and the one which pays the fee.

public_keyobject

Any contains an arbitrary serialized protocol buffer message along with a URL that describes the type of the serialized message.

Protobuf library provides support to pack/unpack Any values in the form of utility functions or additional generated methods of the Any type.

Example 1: Pack and unpack a message in C++.

Foo foo = ...;
Any any;
any.PackFrom(foo);
...
if (any.UnpackTo(&foo)) {
  ...
}

Example 2: Pack and unpack a message in Java.

Foo foo = ...;
Any any = Any.pack(foo);
...
if (any.is(Foo.class)) {
  foo = any.unpack(Foo.class);
}
// or ...
if (any.isSameTypeAs(Foo.getDefaultInstance())) {
  foo = any.unpack(Foo.getDefaultInstance());
}

Example 3: Pack and unpack a message in Python.

foo = Foo(...)
any = Any()
any.Pack(foo)
...
if any.Is(Foo.DESCRIPTOR):
  any.Unpack(foo)
  ...

Example 4: Pack and unpack a message in Go

 foo := &pb.Foo{...}
 any, err := anypb.New(foo)
 if err != nil {
   ...
 }
 ...
 foo := &pb.Foo{}
 if err := any.UnmarshalTo(foo); err != nil {
   ...
 }

The pack methods provided by protobuf library will by default use 'type.googleapis.com/full.type.name' as the type URL and the unpack methods only use the fully qualified type name after the last '/' in the type URL, for example "foo.bar.com/x/y.z" will yield type name "y.z".

JSON

The JSON representation of an Any value uses the regular representation of the deserialized, embedded message, with an additional field @type which contains the type URL. Example:

package google.profile;
message Person {
  string first_name = 1;
  string last_name = 2;
}

{
  "@type": "type.googleapis.com/google.profile.Person",
  "firstName": <string>,
  "lastName": <string>
}

If the embedded message type is well-known and has a custom JSON representation, that representation will be embedded adding a field value which holds the custom JSON in addition to the @type field. Example (for message [google.protobuf.Duration][]):

{
  "@type": "type.googleapis.com/google.protobuf.Duration",
  "value": "1.212s"
}
type_urlstring

A URL/resource name that uniquely identifies the type of the serialized protocol buffer message. This string must contain at least one "/" character. The last segment of the URL's path must represent the fully qualified name of the type (as in path/google.protobuf.Duration). The name should be in a canonical form (e.g., leading "." is not accepted).

In practice, teams usually precompile into the binary all types that they expect it to use in the context of Any. However, for URLs which use the scheme http, https, or no scheme, one can optionally set up a type server that maps type URLs to message definitions as follows:

  • If no scheme is provided, https is assumed.
  • An HTTP GET on the URL must yield a [google.protobuf.Type][] value in binary format, or produce an error.
  • Applications are allowed to cache lookup results based on the URL, or have them precompiled into a binary to avoid any lookup. Therefore, binary compatibility needs to be preserved on changes to types. (Use versioned type names to manage breaking changes.)

Note: this functionality is not currently available in the official protobuf release, and it is not used for type URLs beginning with type.googleapis.com.

Schemes other than http, https (or the empty scheme) might be used with implementation specific semantics.

valuestring (byte)

Must be a valid serialized protocol buffer of the above specified type.

mode_infoobject

ModeInfo describes the signing mode of a single or nested multisig signer.

singleobject
multiobject
sequencestring (uint64)

sequence is the sequence of the account, which describes the number of committed transactions signed by a given address. It is used to prevent replay attacks.

feeobject

Fee is the fee and gas limit for the transaction. The first signer is the primary signer and the one which pays the fee. The fee can be calculated based on the cost of evaluating the body and doing signature verification of the signers. This can be estimated via simulation.

amountobject[]
denomstring
amountstring
gas_limitstring (uint64)
payerstring

if unset, the first signer is responsible for paying the fees. If set, the specified account must pay the fees. the payer must be a tx signer (and thus have signed this field in AuthInfo). setting this field does not change the ordering of required signers for the transaction.

granterstring
tipobject

Tip is the optional tip used for transactions fees paid in another denom.

This field is ignored if the chain didn't enable tips, i.e. didn't add the TipDecorator in its posthandler.

Since: cosmos-sdk 0.46

amountobject[]
denomstring
amountstring
tipperstring
signaturesstring (byte)[]

signatures is a list of signatures that matches the length and order of AuthInfo's signer_infos to allow connecting signature meta information like public key and signing mode by position.

tx_bytesstring (byte)

tx_bytes is the raw transaction.

Since: cosmos-sdk 0.43

Responses
gas_wantedstring (uint64)

GasWanted is the maximum units of work we allow this tx to perform.

gas_usedstring (uint64)

GasUsed is the amount of gas actually consumed.

datastring (byte)

Data is any data returned from message or handler execution. It MUST be length prefixed in order to separate data from multiple message executions. Deprecated. This field is still populated, but prefer msg_response instead because it also contains the Msg response typeURL.

logstring

Log contains the log information from message or handler execution.

eventsobject[]

Events contains a slice of Event objects that were emitted during message or handler execution.

typestring

Event type.

attributesobject[]

Event attributes (key-value pairs).

keystring

Attribute key.

valuestring

Attribute value.

indexboolean

Whether the attribute is indexed.

msg_responsesobject[]

List of Msg handler response types packed as Any.

type_urlstring

A URL/resource name that uniquely identifies the type of the serialized protocol buffer message. This string must contain at least one "/" character. The last segment of the URL's path must represent the fully qualified name of the type (as in path/google.protobuf.Duration). The name should be in a canonical form (e.g., leading "." is not accepted).

In practice, teams usually precompile into the binary all types that they expect it to use in the context of Any. However, for URLs which use the scheme http, https, or no scheme, one can optionally set up a type server that maps type URLs to message definitions as follows:

  • If no scheme is provided, https is assumed.
  • An HTTP GET on the URL must yield a [google.protobuf.Type][] value in binary format, or produce an error.
  • Applications are allowed to cache lookup results based on the URL, or have them precompiled into a binary to avoid any lookup. Therefore, binary compatibility needs to be preserved on changes to types. (Use versioned type names to manage breaking changes.)

Note: this functionality is not currently available in the official protobuf release, and it is not used for type URLs beginning with type.googleapis.com.

Schemes other than http, https (or the empty scheme) might be used with implementation specific semantics.

valuestring (byte)

Must be a valid serialized protocol buffer of the above specified type.

X-API-KEY
RequestCU40
cURL
curl -X POST "https://rest-babylon-mainnet.nodit.io/cosmos/tx/v1beta1/simulate" \
  -H "X-API-KEY: {YOUR_API_KEY}" \
  -H "Content-Type: application/json" \
  -d '{
  "tx": {
    "body": {
      "messages": [
        {}
      ],
      "memo": "string",
      "timeout_height": "string",
      "extension_options": [
        {}
      ],
      "non_critical_extension_options": [
        {}
      ]
    },
    "auth_info": {
      "signer_infos": [
        {}
      ],
      "fee": {
        "amount": [],
        "gas_limit": "string",
        "payer": "string",
        "granter": "string"
      },
      "tip": {
        "amount": [],
        "tipper": "string"
      }
    },
    "signatures": ["string"]
  },
  "tx_bytes": "string"
}'
Response
Example · 200
{
  "gas_info": {
    "gas_wanted": "string",
    "gas_used": "string"
  },
  "result": {
    "data": "string",
    "log": "string",
    "events": [
      {
        "type": "string",
        "attributes": []
      }
    ],
    "msg_responses": [
      {
        "type_url": "string",
        "value": "string"
      }
    ]
  }
}

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