Contract
?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
{
"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}
{
"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}
{
"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 checkverifystatus
to view verification status.
{
"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
if a smart contract is already verified on Sourcify, it will automatically fetch the data from the repo
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--
{
"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"'
{
"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}
{
"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}
{
"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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