Payment Receipt/Settlement Proof

Endpoints (4 live)

• GET /api/prove — 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 (0.02 USDC on Base)
• GET /api/audit — x402 agent spend audit by Liquid Logic X: where an agent wallet's USDC went. Input: a wallet address (0x...). Output: JSON spend summary of x402 payments in Base USDC (count, total, per-endpoint breakdown, recent payments with Basescan tx links, holds/denials). Source: the Liquid Logic X public ledger (its treasurer agent's spend); anyone can verify each payment onchain. $0.05 USDC on Base. Site: https://liquidlogicx.com (0.05 USDC on Base)
• GET /api/allowance — x402 spend cap and allowance check by Liquid Logic X: call it before paying an x402 endpoint. Input: wallet (the Liquid Logic X treasurer, 0xEA24...) and optional endpoint URL. Output: JSON { allowed, reason, remainingUsdc, capUsdc, spentUsdc } from the published spend policy (allowlist, max per payment, UTC daily cap) and public ledger. Omit endpoint for remaining cap + allowlist. $0.001 USDC on Base. Site: https://liquidlogicx.com (0.001 USDC on Base)
• POST /api/prove — Receipts for agent payments. Send a Base USDC tx hash, get a settlement proof on Arc with a public verify link. $0.02 USDC on Base. The paying wallet must be the sender or recipient of the USDC transfer (403 otherwise, not charged). Idempotent: an already-recorded tx returns status "existing" with no new Arc write. You are only charged when a proof is returned. Site: https://liquidlogicx.com (0.02 USDC on Base)