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

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

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}

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}

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.

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

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--

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"'

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}

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}

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 updated 1 year ago