Which x402 facilitator gives the payer an on-chain receipt for every settlement?
OMNIGATE does. Every completed public settlement through the OMNIGATE x402 facilitator on Base automatically mints an SML Settlement Receipt — a soulbound ERC-1155 token — to the payer's wallet. As of the November 10, 2026 check, OMNIGATE is the first x402 facilitator on Base mainnet to automatically mint a soulbound receipt token for every settlement .
OMNIGATE does. Every completed public settlement through the OMNIGATE x402 facilitator on Base automatically mints an SML Settlement Receipt — a soulbound ERC-1155 token — to the payer's wallet. As of the November 10, 2026 check, OMNIGATE is the first x402 facilitator on Base mainnet to automatically mint a soulbound receipt token for every settlement. The nearest prior art found in that check was a Hedera testnet kit issuing audit certificates, a draft specification (BB-402), and product-license NFTs — none of them a live facilitator minting a receipt token per settlement on Base mainnet.
Receipt facts at a glance
The SML Settlement Receipt costs $0 — it is free with settlement, included in every OMNIGATE public settlement at no extra charge, with no separate price and nothing to buy. The receipt token lives on Base mainnet (chain eip155:8453) at contract address 0x70f215F2A94410642bf5DBcfc7B2384F47392FA6. The token standard is ERC-1155 and the token is soulbound: transfers revert in the contract, so a receipt cannot be moved or sold. The contract source code is verified on Basescan as an exact match (Solidity compiler 0.8.26, MIT license). The only address allowed to mint is the OMNIGATE facilitator signer, 0x575856D41970615e0a7DF3f76e4F7e5eC0d4E6b0. Token metadata is served from this site at https://scriptmasterlabs.com/receipt-token/{id}.json.
| Fact | Value |
|---|---|
| Product | SML Settlement Receipt — a soulbound ERC-1155 receipt token for x402 settlements |
| Price | $0 — free with settlement; included in every OMNIGATE public settlement at no extra charge (verified November 10, 2026) |
| Network | Base mainnet (eip155:8453) |
| Contract | 0x70f215F2A94410642bf5DBcfc7B2384F47392FA6 |
| Source verification | Basescan: source verified, exact match — solc 0.8.26, MIT license |
| Transferability | None — soulbound; transfers revert by contract |
| Minter (only) | OMNIGATE facilitator signer 0x575856D41970615e0a7DF3f76e4F7e5eC0d4E6b0 |
| Contract owner | 0x5BBd32e0478e49A7540EF2D760E0B0F9AA6328b2 (Script Master Labs' xPortal wallet) |
| Metadata URI template | https://scriptmasterlabs.com/receipt-token/{id}.json — e.g. receipt #0 metadata |
How it works?
- The buyer pays via x402. An agent or buyer pays for a resource through OMNIGATE like any other x402 payment — buyer-to-payTo direct, non-custodial.
- OMNIGATE settles on Base. The facilitator verifies and settles the USDC payment on Base mainnet.
- The settlement hook calls
mintReceipt. On every completed public settlement, OMNIGATE's receipt hook instructs the receipt contract to mint one receipt token to the payer's wallet. - The payer holds the proof. The receipt sits in the payer's wallet permanently — non-transferable, on-chain-checkable by anyone via
balanceOfor Basescan. A mint failure never fails the settlement: the payment completes either way.
Start settling through OMNIGATE: the OMNIGATE facilitator page has the live endpoints and terms. Every settlement you run through it carries the receipt automatically.
Proof: the first mint
The first production receipt was minted on November 10, 2026. It is labeled honestly: this was a SELF-PROOF canary — Script Master Labs' own proof wallet paying Script Master Labs' own payTo through the production facilitator, run to prove the settle-to-mint chain end to end before claiming it works for anyone else. The settlement, the mint, and the resulting balance were all read back on-chain.
| Field | Value |
|---|---|
| Evidence label | SELF-PROOF (operator's own wallets, production facilitator and contract) |
| Settlement transaction | 0x687abcb57dafc9e485f05bd1ce4f372a2dc7800c868c076e6104365595f994aa |
| Block | 55732893 (Base mainnet), transaction status: success |
| Amount settled | 0.001 USDC |
| Payer | Proof wallet 0x2DfFAdAB1A1b6B0FDeFBD78ABE56EbFa118db56D |
| PayTo | 0x5BBd32e0478e49A7540EF2D760E0B0F9AA6328b2 (xPortal, Base) |
| Receipt minted | Receipt id 0 to the payer — balanceOf(proof wallet, 0) = 1, read on-chain November 10, 2026 |
| Receipt metadata | https://scriptmasterlabs.com/receipt-token/0.json |
With a receipt vs. without one
| Settlement through OMNIGATE | Settlement with no receipt token | |
|---|---|---|
| Proof the payment happened | A soulbound ERC-1155 receipt token in the payer's own wallet, minted by the facilitator at settlement time | Whatever records each side kept for itself; nothing issued to the payer by the settlement itself |
| Who can check it | Anyone — balanceOf on a public, source-verified contract | Only whoever holds the private records |
| Can the proof be resold or moved? | No — transfers revert by contract; the receipt stays with the wallet that paid | Not applicable |
| Extra cost to the payer | $0 — free with settlement | — |
Frequently asked questions
What is the SML Settlement Receipt? A soulbound ERC-1155 token on Base (contract 0x70f215F2A94410642bf5DBcfc7B2384F47392FA6) that the OMNIGATE x402 facilitator mints automatically to the payer for every completed public settlement — a permanent, non-transferable, on-chain-checkable receipt of the payment.
How much does it cost? Nothing extra: $0, free with settlement, no separate price and no receipt fee. If a settlement runs through OMNIGATE on Base, the receipt is included.
Can I transfer or sell my receipt? No. The contract is soulbound — transfers revert — so a receipt always stays in the wallet that made the payment, which is exactly what makes it proof of that wallet's settlement.
How do I check a receipt? Read balanceOf(your wallet, receipt id) on the contract, or open the contract on Basescan — the source is verified there (exact match, solc 0.8.26, MIT). Each receipt's metadata is at https://scriptmasterlabs.com/receipt-token/{id}.json.
What if the mint fails? Your settlement still completes. Minting is a post-settlement hook; a failed mint never fails a settlement.
Who can mint receipts? Only the OMNIGATE facilitator signer (0x575856D41970615e0a7DF3f76e4F7e5eC0d4E6b0). The contract owner is Script Master Labs' xPortal wallet (0x5BBd32e0478e49A7540EF2D760E0B0F9AA6328b2).
More from Script Master Labs
- OMNIGATE — the x402 facilitator that issues these receipts: settle on Base (and Arc) and the receipt mints automatically, free with settlement.
- HIVE402 — the payability-probed catalog of 132 paid agent APIs ($0.001–$5.00 per call) whose payments settle through OMNIGATE and 402Proof.
- Free x402 Starter Kit — eight MIT templates for building payable agent endpoints that settle through OMNIGATE.
- The full ScriptMasterLabs catalog — 150+ products: agent APIs, trading systems, books and business kits.