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Verification uploads your contract’s source code to the block explorer and proves it compiles to the deployed bytecode. Once verified, users can read state, call functions, and audit the source on Stablescan without re-hosting your code. This guide walks through verifying a Foundry-deployed contract on Stable.

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Prerequisites

  • A contract already deployed on Stable testnet or mainnet. If you haven’t deployed yet, see Deploy a smart contract.
  • Foundry installed (forge available in your PATH).
  • The deployed contract address from your forge create output.

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1. Confirm the deployed address

Make sure you have the Deployed to address from your earlier deployment. From the Deploy a smart contract flow, this was the value printed after forge create. 
cast code 0xDeployedContractAddress --rpc-url https://rpc.testnet.stable.xyz | head -c 20

0x6080604052600436...
A non-empty bytecode confirms the contract is deployed at that address.

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2. Run forge verify-contract

Foundry’s verification flow submits your source to the Stablescan verifier. 
forge verify-contract \
  0xDeployedContractAddress \
  src/Counter.sol:Counter \
  --chain-id 2201 \
  --verifier blockscout \
  --verifier-url https://testnet.stablescan.xyz/api \
  --watch

Start verifying contract `0xDeployedContractAddress` deployed on 2201

Submitting verification of contract: Counter
Submitted contract for verification:
        Response: `OK`
        GUID: `abc123...`
        URL: https://testnet.stablescan.xyz/address/0xDeployedContractAddress
Contract verification status:
Response: `OK`
Details: `Pass - Verified`
Contract successfully verified
--watch blocks until verification finishes so you don’t have to poll. On mainnet, swap the chain ID to 988 and the verifier URL to https://stablescan.xyz/api.
Constructor arguments: If your contract takes constructor arguments, add --constructor-args $(cast abi-encode "constructor(uint256,address)" 42 0xSomeAddress) to the command. Without this flag, verification fails for any contract with a non-empty constructor.

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3. Confirm verification on Stablescan

Open the contract page on the explorer. 
https://testnet.stablescan.xyz/address/0xDeployedContractAddress
The Contract tab should now show source code, a green “Verified” badge, and the full ABI. Users can read state under Read Contract and send transactions under Write Contract.

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Troubleshooting

  • “Bytecode does not match”: your source compiles to different bytecode than what’s deployed. Most often caused by mismatched Solidity version or optimizer settings. Pass --compiler-version and --optimizer-runs explicitly to match your foundry.toml.
  • “GUID not found”: the verifier hasn’t registered your submission yet. Re-run with --watch or manually check the URL printed in the response.
  • Contract uses libraries: add --libraries src/Lib.sol:Lib:0xDeployedLibAddress for each linked library.

Index contract events

Subscribe to on-chain events with ethers.js and build a live event stream.

Deploy a smart contract

Scaffold a fresh Foundry project and deploy to Stable testnet.

JSON-RPC reference

See which eth_* methods Stable supports for on-chain interactions.
Last modified on April 23, 2026