SOLVES CRYPTO & X402'S #1 PAIN POINT

Never Pay for Undelivered API Calls or Unfinished Work Again.

Standard crypto transfers and raw x402 facilitator calls settle irreversibly before the seller delivers — if a seller's server crashes with HTTP 500 or a freelancer ghosts, the buyer loses their money with zero recourse. UnFee Proof-of-Delivery & Buyer-Protected Escrow enforces atomic HTTP-200 payload verification for APIs and non-custodial milestone release for human invoices at 0% middleman fee.

1. Atomic HTTP-200 Proof-of-Delivery (x402 APIs)

VERIFIED_SELLER · 97.93% Delivery Rate

UnFee holds the buyer's EIP-3009 authorization in memory while calling the upstream API. If the seller returns HTTP 200 with a non-empty payload, UnFee computes the cryptographic X-UnFee-Proof-Of-Delivery: sha256=... receipt and settles. If upstream returns 5xx/empty, UnFee drops the authorization and charges the buyer $0.00.

VERIFIED DELIVERIES

142

DROPPED FAILED CALLS

BUYER USD SAVED

$0.03

Click either button above to test live POST /api/v1/x402/verify-delivery...

2. Non-Custodial Milestone & Invoice Escrow

Lock Base USDC / XRP / RLUSD into buyer-protected delivery escrow (contracts/UnFeeDeliveryEscrow.sol). Seller submits cryptographic SHA-256 delivery proof; buyer releases 100% of funds on confirmation or auto-refunds on timeout.

Seller / Merchant Wallet

Buyer / Client Wallet

Escrow Amount

Currency

Deliverable / Milestone Description

Active & Completed Buyer-Protected Escrow Deals

Solidity Contract: contracts/UnFeeDeliveryEscrow.sol · 0% Fee

ESCROW ID / INVOICE	DELIVERABLE & CRYPTOGRAPHIC PROOF	AMOUNT	ESCROW STATUS
esc_demo_api_02 INV-1042	Custom x402 Gateway Integration & Webhook Setup Seller: 0xAF41...dFd0 · Buyer: 0x8783...3659	$150.00 USDC	ESCROW_FUNDED_AWAITING_DELIVERY
esc_demo_audit_01 INV-1001	Base Smart Contract Security Audit + PoC Suite Seller: 0xAF41...dFd0 · Buyer: 0x1d7f...7e95 SHA-256 Proof: cd8321dc6479dfd4b473...	$500.00 USDC	RELEASED_TO_SELLER