Call Contract | Validation Cloud

Invoke a smart contract

post

Returns a result from EVM execution such as cost-free execution of read-only smart contract queries, gas estimation, and transient simulation of read-write operations. If estimate field is set to true gas estimation is executed. Currently we support only latest block.

The table below defines the restrictions and support for the endpoint

Estimate	Operation Type	Mirror Node Version
false	static contract state reads for non precompile functions	0.78+
	static contract state reads for precompile functions except allowance/isApprovedForAll	0.78+
	static contract state reads for precompile functions with allowance	0.79+
	static contract state reads for precompile functions with isApprovedForAll	0.81+
	non-static contract state reads for non precompile functions	0.83+
	non-static contract state reads for precompile read only functions	0.83+
true	non-static contract state reads and modifications for non precompile functions except lazy account creation	0.83+
	non-static contract state reads and modifications for associate precompile functions	0.83+
	non-static contract state reads and modifications for non precompile functions with lazy account creation	0.84+
	non-static contract state reads and modifications for precompile functions except associate	Not supported

The operations types which are not currently supported should return 501 error status.

Body

blockstring | nullableOptional

Hexadecimal block number or the string "latest", "pending", "earliest". Defaults to "latest".

Example: latestPattern: ^((0x)?[0-9a-fA-F]+|(earliest|pending|latest))$

datastring · binary | nullableOptional

Hexadecimal method signature and encoded parameters.

Example: 0x0198489200000000000000000000000000000000000000000000000000000000000003eePattern: ^(0x)?[0-9a-fA-F]+$

estimateboolean | nullableOptional

Whether gas estimation is called. Defaults to false.

Example: true

fromstring · binary | nullableOptional

The 20-byte hexadecimal EVM address the transaction is sent from.

Example: 00000000000000000000000000000000000004e2Pattern: ^(0x)?[A-Fa-f0-9]{40}$

gasinteger · int64 | nullableOptional

Gas provided for the transaction execution. Defaults to 120000000.

Example: 120000000

gasPriceinteger · int64 | nullableOptional

Gas price used for each paid gas.

Example: 100000000

tostring · binary · min: 40 · max: 42Required

The 20-byte hexadecimal EVM address the transaction is directed to.

Example: 0x00000000000000000000000000000000000003f4Pattern: ^(0x)?[A-Fa-f0-9]{40}$

valueinteger · int64 | nullableOptional

Value sent with this transaction. Defaults to 0.

Example: 0

Responses

post

POST /v1/YOUR_API_KEY/api/v1/contracts/call HTTP/1.1
Host: mainnet.hedera.validationcloud.io
Content-Type: application/json
Accept: */*
Content-Length: 265

{
  "block": "latest",
  "data": "0x0198489200000000000000000000000000000000000000000000000000000000000003ee",
  "estimate": true,
  "from": "00000000000000000000000000000000000004e2",
  "gas": 120000000,
  "gasPrice": 100000000,
  "to": "0x00000000000000000000000000000000000003f4",
  "value": 0
}

{
  "result": "0x94c4d54535f6e616d6500"
}