Diff bytecode structure API

Decode two caller-supplied EVM bytecodes, or two instruction lists, into opcodes and compare the instruction sequence. Similarity ignores PUSH immediates. The risk delta counts CALL, SSTORE, CREATE, DELEGATECALL, CALLCODE, and SELFDESTRUCT. A high similarity is not proof that the contracts behave the same. No chain is queried.

The Diff bytecode structure operation is part of the Contract Bytecode Compare API on BRAINIAC.software. Decode two caller-supplied EVM bytecodes, or two instruction lists, into opcodes and compare the instruction sequence. Similarity ignores PUSH immediates. The risk delta counts CALL, SSTORE, CREATE, DELEGATECALL, CALLCODE, and SELFDESTRUCT. A high similarity is not proof that the contracts behave the same. No chain is queried. It is exposed as POST /api/v1/contract-security/bytecode-structure-diff and priced at $0.04 USDC on Base. Payment uses the x402 exact scheme: an unpaid call returns HTTP 402 with payment requirements; after paying the exact USDC amount, retry the same request with a payment-signature header and Idempotency-Key. No account and no API key are required. Data sources for this product: Caller-supplied EVM bytecode processed locally Limitations: Hashes are keccak256 of the supplied bytes. No chain state is read. A difference is not a judgment that either bytecode is malicious, and similar bytecode is not equivalent behavior. Normalization masks only caller-supplied immutable ranges and a reliably identified compiler metadata suffix. No source code is verified. bytecode-structure-diff compares opcodes. PUSH immediates change the divergence list and do not change the similarity index. Outputs are compliance prechecks, drafts, or data lookups for human review. They are not official determinations, legal advice, identity confirmation, or certified filings. Related operations in this group include Compare contract bytecode. Open the group documentation for the full request schema, field notes, and response examples before integrating.