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Contract

?module=contract

https://fonscan.io/api?module=contract

Get a list of contracts

listcontracts
List sorted in ascending order based on the time a contact was first indexed by the explorer. With filters `not_decompiled`(`4`) or `not_verified(4)` the results will not be sorted for performance reasons.
Example:
https://fonscan.io/api
?module=contract
&action=listcontracts
Request params
Example Result
​
Parameter
Description
page
optional nonnegative integer representing the page number used for pagination. 'offset' must also be provided.
offset
optional nonnegative integer representing the max number of records to return when paginating. 'page' must also be provided.
filter
optional string verified|decompiled|unverified|not_decompiled|empty, or 1|2|3|4|5 respectively. Returns contracts with the requested status.
not_decompiled_with_version
optional string ensures none of the returned contracts were decompiled with the provided version. Ignored unless filtering for decompiled contracts.
verified_at_start_timestamp
optional unix timestamp Represents the starting timestamp for verified contracts. Only used with verified filter.
verified_at_end_timestamp
optional unix timestamp Represents the ending timestamp for verified contracts. Only used with verified filter.
{
"message": "OK",
"result": [
{
"ABI": "[{\n\"type\":\"event\",\n\"inputs\": [{\"name\":\"a\",\"type\":\"uint256\",\"indexed\":true},{\"name\":\"b\",\"type\":\"bytes32\",\"indexed\":false}],\n\"name\":\"Event\"\n}, {\n\"type\":\"event\",\n\"inputs\": [{\"name\":\"a\",\"type\":\"uint256\",\"indexed\":true},{\"name\":\"b\",\"type\":\"bytes32\",\"indexed\":false}],\n\"name\":\"Event2\"\n}, {\n\"type\":\"function\",\n\"inputs\": [{\"name\":\"a\",\"type\":\"uint256\"}],\n\"name\":\"foo\",\n\"outputs\": []\n}]\n",
"CompilerVersion": "v0.2.1-2016-01-30-91a6b35",
"ContractName": "Test",
"OptimizationUsed": "1",
"SourceCode": "pragma solidity >0.4.24;\n\ncontract Test {\nconstructor() public { b = hex\"12345678901234567890123456789012\"; }\nevent Event(uint indexed a, bytes32 b);\nevent Event2(uint indexed a, bytes32 b);\nfunction foo(uint a) public { emit Event(a, b); }\nbytes32 b;\n}\n"
}
],
"status": "1"
}

Get ABI for a verified contract

getabi
Also available through a GraphQL addresses query.
Example:
https://fonscan.io/api
?module=contract
&action=getabi
&address={addressHash}
Request params
Example Result
​
Parameter
Description
address
string containing the address hash.
{
"message": "OK",
"result": "[{\"constant\":false,\"inputs\":[{\"name\":\"voucher_token\",\"type\":\"bytes32\"}],\"name\":\"burn\",\"outputs\":[{\"name\":\"success\",\"type\":\"bool\"}],\"payable\":false,\"stateMutability\":\"nonpayable\",\"type\":\"function\"},{\"constant\":true,\"inputs\":[{\"name\":\"voucher_token\",\"type\":\"bytes32\"}],\"name\":\"is_expired\",\"outputs\":[{\"name\":\"\",\"type\":\"bool\"}],\"payable\":false,\"stateMutability\":\"view\",\"type\":\"function\"},{\"constant\":false,\"inputs\":[{\"name\":\"voucher_token\",\"type\":\"bytes32\"}],\"name\":\"is_burnt\",\"outputs\":[{\"name\":\"\",\"type\":\"bool\"}],\"payable\":false,\"stateMutability\":\"nonpayable\",\"type\":\"function\"},{\"inputs\":[{\"name\":\"voucher_token\",\"type\":\"bytes32\"},{\"name\":\"_lifetime\",\"type\":\"uint256\"}],\"payable\":false,\"stateMutability\":\"nonpayable\",\"type\":\"constructor\"}]",
"status": "1"
}

Get contract source code for a verified contract

getsourcecode
Also available through a GraphQL addresses query.
Example:
https://fonscan.io/api
?module=contract
&action=getsourcecode
&address={addressHash}
Request params
Example Result
​
Parameter
Description
address
string containing the address hash.
{
"message": "OK",
"result": {
"ABI": "[{\n\"type\":\"event\",\n\"inputs\": [{\"name\":\"a\",\"type\":\"uint256\",\"indexed\":true},{\"name\":\"b\",\"type\":\"bytes32\",\"indexed\":false}],\n\"name\":\"Event\"\n}, {\n\"type\":\"event\",\n\"inputs\": [{\"name\":\"a\",\"type\":\"uint256\",\"indexed\":true},{\"name\":\"b\",\"type\":\"bytes32\",\"indexed\":false}],\n\"name\":\"Event2\"\n}, {\n\"type\":\"function\",\n\"inputs\": [{\"name\":\"a\",\"type\":\"uint256\"}],\n\"name\":\"foo\",\n\"outputs\": []\n}]\n",
"CompilerVersion": "v0.2.1-2016-01-30-91a6b35",
"ContractName": "Test",
"FileName": "{sourcify path or empty}",
"ImplementationAddress": "0x000000000000000000000000000000000000000e",
"IsProxy": "true",
"OptimizationUsed": "1",
"SourceCode": "pragma solidity >0.4.24;\n\ncontract Test {\nconstructor() public { b = hex\"12345678901234567890123456789012\"; }\nevent Event(uint indexed a, bytes32 b);\nevent Event2(uint indexed a, bytes32 b);\nfunction foo(uint a) public { emit Event(a, b); }\nbytes32 b;\n}\n"
},
"status": "1"
}

Verify a contract with its source code and contract creation information

verify
Example:
https://fonscan.io/api
?module=contract
&action=verify
&addressHash={addressHash}
&name={name}
&compilerVersion={compilerVersion}
&optimization={false}
&contractSourceCode={contractSourceCode}
Curl Post Example
curl -d '{"addressHash":"0xc63BB6555C90846afACaC08A0F0Aa5caFCB382a1","compilerVersion":"v0.5.4+commit.9549d8ff", "contractSourceCode":"pragma solidity ^0.5.4; contract Test { }","name":"Test","optimization":false}' -H "Content-Type: application/json" -X POST "https://blockscout.com/poa/sokol/api?module=contract&action=verify"
On successful submission you will receive a guid as a receipt. Use this with checkverifystatusto view verification status.
Request params
Example Result
​
Parameter
Description
addressHash
string containing the address hash of the contract.
name
string containing the name of the contract.
compilerVersion
string containing the compiler version for the contract.
optimization
enum whether or not compiler optimizations were enabled 0=false, 1=true
contractSourceCode
string containing the source code of the contract.
constructorArguments
optional string constructor argument data provided.
autodetectConstructorArguments
optional boolean whether or not automatically detect constructor argument.
evmVersion
optional EVM version for the contract.
optimizationRuns
optional number of optimization runs used during compilation
library1Name
optional string name of the first library used.
library1Address
optional string address of the first library used.
library2Name
optional string name of the second library used.
library2Address
optional string address of the second library used.
library3Name
optional string name of the third library used.
library3Address
optional string address of the third library used.
library4Name
optional string name of the fourth library used.
library4Address
optional string address of the fourth library used.
library5Name
optional string name of the fifth library used.
library5Address
optional string address of the fifth library used.
{
"message": "OK",
"result": {
"ABI": "[{\n\"type\":\"event\",\n\"inputs\": [{\"name\":\"a\",\"type\":\"uint256\",\"indexed\":true},{\"name\":\"b\",\"type\":\"bytes32\",\"indexed\":false}],\n\"name\":\"Event\"\n}, {\n\"type\":\"event\",\n\"inputs\": [{\"name\":\"a\",\"type\":\"uint256\",\"indexed\":true},{\"name\":\"b\",\"type\":\"bytes32\",\"indexed\":false}],\n\"name\":\"Event2\"\n}, {\n\"type\":\"function\",\n\"inputs\": [{\"name\":\"a\",\"type\":\"uint256\"}],\n\"name\":\"foo\",\n\"outputs\": []\n}]\n",
"CompilerVersion": "v0.2.1-2016-01-30-91a6b35",
"ContractName": "Test",
"ImplementationAddress": "0x000000000000000000000000000000000000000e",
"IsProxy": "true",
"OptimizationUsed": "1",
"SourceCode": "pragma solidity >0.4.24;\n\ncontract Test {\nconstructor() public { b = hex\"12345678901234567890123456789012\"; }\nevent Event(uint indexed a, bytes32 b);\nevent Event2(uint indexed a, bytes32 b);\nfunction foo(uint a) public { emit Event(a, b); }\nbytes32 b;\n}\n"
},
"status": "1"
}
​

Verify a contract through Sourcify​

verify_via_sourcify
  1. 1.
    if a smart contract is already verified on Sourcify, it will automatically fetch the data from the repo​
  2. 2.
    otherwise you need to upload source files and JSON metadata file(s).
Example:
https://fonscan.io/api
?module=contract
&action=verify_via_sourcify
&addressHash={addressHash}

POST body example

--6e1e4c11657c62dc1e4349d024de9e28
Content-Disposition: form-data; name="addressHash"
​
0xb77b7443e0F32F1FEBf0BE0fBd7124D135d0a525
​
--6e1e4c11657c62dc1e4349d024de9e28
Content-Disposition: form-data; name="files[0]"; filename="contract.sol"
Content-Type: application/json
​
...Source code...
​
--6e1e4c11657c62dc1e4349d024de9e28
Content-Disposition: form-data; name="files[1]"; filename="metadata.json"
Content-Type: application/json
​
...JSON metadata...
​
--6e1e4c11657c62dc1e4349d024de9e28--
Request params
Example Result
Parameter
Description
addressHash
string containing the address hash.
files
array with sources and metadata files
{
"message": "OK",
"result": {
"ABI": "[{\n\"type\":\"event\",\n\"inputs\": [{\"name\":\"a\",\"type\":\"uint256\",\"indexed\":true},{\"name\":\"b\",\"type\":\"bytes32\",\"indexed\":false}],\n\"name\":\"Event\"\n}, {\n\"type\":\"event\",\n\"inputs\": [{\"name\":\"a\",\"type\":\"uint256\",\"indexed\":true},{\"name\":\"b\",\"type\":\"bytes32\",\"indexed\":false}],\n\"name\":\"Event2\"\n}, {\n\"type\":\"function\",\n\"inputs\": [{\"name\":\"a\",\"type\":\"uint256\"}],\n\"name\":\"foo\",\n\"outputs\": []\n}]\n",
"CompilerVersion": "v0.2.1-2016-01-30-91a6b35",
"ContractName": "Test",
"ImplementationAddress": "0x000000000000000000000000000000000000000e",
"IsProxy": "true",
"OptimizationUsed": "1",
"SourceCode": "pragma solidity >0.4.24;\n\ncontract Test {\nconstructor() public { b = hex\"12345678901234567890123456789012\"; }\nevent Event(uint indexed a, bytes32 b);\nevent Event2(uint indexed a, bytes32 b);\nfunction foo(uint a) public { emit Event(a, b); }\nbytes32 b;\n}\n"
},
"status": "1"
}

Verify a vyper contract with its source code and contract creation information

verify_vyper_contract
Example
https://fonscan.io/api
?module=contract
&action=verify_vyper_contract
&addressHash={addressHash}
&name={name}
&compilerVersion={compilerVersion}
&contractSourceCode={contractSourceCode}
curl POST example
curl --location --request POST 'http://localhost:4000/api?module=contract&action=verify_vyper_contract' --form 'contractSourceCode="SOURCE_CODE"' --form 'name="Vyper_contract"' --form 'addressHash="0xE60B1B8bD493569a3E945be50A6c89d29a560Fa1"' --form 'compilerVersion="v0.2.12"'
Request params
Example Result
​
Parameter
Description
addressHash
string containing the address hash of the contract.
name
string containing the name of the contract.
compilerVersion
string containing the compiler version for the contract.
contractSourceCode
string containing the source code of the contract.
constructorArguments
string constructor argument data provided.
{
"message": "OK",
"result": {
"ABI": "[{\n\"type\":\"event\",\n\"inputs\": [{\"name\":\"a\",\"type\":\"uint256\",\"indexed\":true},{\"name\":\"b\",\"type\":\"bytes32\",\"indexed\":false}],\n\"name\":\"Event\"\n}, {\n\"type\":\"event\",\n\"inputs\": [{\"name\":\"a\",\"type\":\"uint256\",\"indexed\":true},{\"name\":\"b\",\"type\":\"bytes32\",\"indexed\":false}],\n\"name\":\"Event2\"\n}, {\n\"type\":\"function\",\n\"inputs\": [{\"name\":\"a\",\"type\":\"uint256\"}],\n\"name\":\"foo\",\n\"outputs\": []\n}]\n",
"CompilerVersion": "v0.2.1-2016-01-30-91a6b35",
"ContractName": "Test",
"ImplementationAddress": "0x000000000000000000000000000000000000000e",
"IsProxy": "true",
"OptimizationUsed": "1",
"SourceCode": "pragma solidity >0.4.24;\n\ncontract Test {\nconstructor() public { b = hex\"12345678901234567890123456789012\"; }\nevent Event(uint indexed a, bytes32 b);\nevent Event2(uint indexed a, bytes32 b);\nfunction foo(uint a) public { emit Event(a, b); }\nbytes32 b;\n}\n"
},
"status": "1"
}
​

Verify a contract with Standard input JSON file

verifysourcecode
Example
https://fonscan.io/api
?module=contract
&action=verifysourcecode
&codeformat={solidity-standard-json-input}
&contractaddress={contractaddress}
&contractname={contractname}
&compilerversion={compilerversion}
&sourceCode={sourceCode}
Request params
Example Result
​
Parameter
Description
codeformat
Format of sourceCode (currently only supports solidity-standard-json-input)
contractaddress
string containing the address hash of the contract.
contractname
string name of the contract. It an be an empty string(""), just the contract name("ContractName"), or a filename and contract name("contracts/contract_1.sol:ContractName")
compilerversion
string containing the compiler version for the contract.
sourceCode
string standard input json
constructorArguments
optional string constructor argument data provided.
autodetectConstructorArguments
optional boolean whether or not automatically detect constructor argument.
{
"message": "OK",
"result": "b080b96bd06ad1c9341c2afb7e3730311388544961acde94",
"status": "1"
}

Return status of a verification attempt

checkverifystatus
guid is received as a receipt from the verifysourcecode method.
Example
https://fonscan.io/api
?module=contract
&action=checkverifystatus
&guid={identifierString}
Request params
Example Result
​
Parameter
Description
guid
stringused for identifying verification attempt
{
"message": "OK",
"result": "Pending in queue",
"status": "1"
}
Return Options: Pending in queue | Pass - Verified | Fail - Unable to verify | Unknown UID
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Last modified 22d ago