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Liquid Logic Audit — USDC Payment Proof on Arc
x402
Liquid Logic Audit — USDC Payment Proof on Arc is a paid API for AI agents from audit.liquidlogicx.com, paid per call via x402, $0.02/call, status unknown (last checked 2026-10-29).
Given a Base USDC transaction hash, records a tamper-proof settlement receipt on the Arc blockchain and returns a public verify link.
Price / call$0.02
Success—
StatusUnknown
How this service works
Payment receipt and settlement proof for x402 and agent payments, by Liquid Logic X. Input: a Base USDC tx hash (optional memo). Output: JSON proof recorded onchain on Arc mainnet (proofId, from/to/amount, Arc tx, refId) plus a public verify link anyone can check. $0.02 USDC on Base, charged only when a proof is returned. Your paying wallet must be the tx sender or recipient. Liquid Logic X also records proofs on Tempo mainnet. Site: https://liquidlogicx.com
Output
Returns a JSON object containing: proof status ('recorded' for new or 'existing' for already-seen), a refId (keccak256-derived settlement ID on Arc), source transfer details (from/to addresses, USDC amount, Base block timestamp, Base tx hash), Arc anchoring details (chain eip155:5042, contract address, Arc tx hash), optional memo, and a public verifyUrl to share as proof of payment. No Arc write and no charge if the tx was already recorded.
Example use cases
Agent payment receipt after x402 call
“I paid an x402 API with my wallet and the Base tx hash is 0xabc123...def456 — please generate a settlement proof on Arc so I have a verifiable receipt I can attach to my logs.”
Audit trail for freelance crypto invoice
“I just paid a contractor 50 USDC on Base, tx hash 0x9f8e7d...c6b5a4 — can you anchor a proof of that payment on Arc with the memo 'Invoice #42 - design work' so I have an immutable record?”
Verify an already-submitted proof
“I think I already recorded a settlement proof for Base tx 0x1234ab...cd5678 — can you check if it exists on Arc and give me the verify link again without charging me twice?”
Technical details
Endpoint
GEThttps://audit.liquidlogicx.com/api/prove?utm_source=zero.xyzWhen to prefer
Choose this endpoint when you need a tamper-proof, publicly verifiable on-chain receipt for a USDC payment made on Base — especially for agentic payment flows using x402 protocols where audit trails matter. It is idempotent (safe to call twice), cheap ($0.02 USDC), and only charges when a new proof is actually written to Arc. Prefer it over off-chain logging when you need a public verify URL you can share with third parties as proof of settlement.
Side effects
- 403 Forbidden — paying wallet is neither the sender nor recipient of the USDC transfer in the given tx hash
- Invalid tx hash format — must be 0x followed by 64 hex characters
- Tx hash contains no USDC Transfer event from Base USDC contract 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913
- Payment not made — x402 $0.02 USDC charge failed, proof not recorded
- Network timeout fetching Base mainnet transaction data
- Transaction not yet confirmed on Base mainnet
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| inputrequired | object | |
| output | object |
Tags
x402
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