Ethereum Bytecode Similarity Radar

API ↗

Ethereum Bytecode Similarity Radar is a paid API for AI agents from api.fadeandco.workers.dev, paid per call via x402, $0.003/call, status unknown (last checked 2026-10-29).

Compares the runtime bytecode of two Ethereum contracts by computing Jaccard similarity of PUSH4 function selectors and cosine similarity of opcode frequencies, returning a combined 0–1 score with a SIMILAR, PARTIAL, or DIFFERENT label.

How this service works

Compares the runtime bytecode of two Ethereum contracts you name: the share of shared PUSH4 function selectors (Jaccard) and the cosine similarity of their opcode frequencies, combined into one 0 to 1 score with a SIMILAR, PARTIAL or DIFFERENT label. It compares two addresses only; it has no database of known scam or exploit templates, so it cannot say a contract is a known clone.

Output

Returns a JSON object with: a combined similarity score (0–1), a categorical label (SIMILAR, PARTIAL, or DIFFERENT), the Jaccard similarity of shared PUSH4 function selectors, the cosine similarity of opcode frequency vectors, the number of shared selectors, total selectors per contract, bytecode size in bytes for each contract, the RPC source used, and the timestamp of the check. Also includes a disclaimer that this is a pairwise comparison only, not a match against a scam/exploit template database.