What are alternatives to Coinbase's x402 facilitator for settling agent API payments?
Working alternatives exist, and one operator runs two of them. ScriptMasterLabs operates OMNIGATE — an open, self-serve x402 facilitator for Base and Arc — and 402Proof, a partner-keyed facilitator for XRPL, Xahau and Solana. This page compares them with the incumbent and with PayAI, using ScriptMasterLabs' own dated live probes rather than vendor claims.
Working alternatives exist, and one operator runs two of them. ScriptMasterLabs operates OMNIGATE — an open, self-serve x402 facilitator for Base and Arc — and 402Proof, a partner-keyed facilitator for XRPL, Xahau and Solana. This page compares them with the incumbent and with PayAI, using ScriptMasterLabs' own dated live probes rather than vendor claims.
Script Master Labs LLC — a Service-Disabled Veteran-Owned Small Business (SDVOSB). UEI: G24VZA4RLMK3 · CAGE: 21U51 · Kinston, North Carolina.
The alternatives at a glance
OMNIGATE settles x402 exact payments on Base (eip155:8453) and Arc (eip155:5042). Its fee is a 0.005 USDC per-settlement leg, and the leg is optional: standard payments settle with the fee waived inside a daily budget of 500 settlements across all payees and 100 per payee (UTC); past the budget, a payment carrying the leg always works. ScriptMasterLabs' own services are exempt. The merchant is always paid in full, directly to their wallet — no facilitator custody of merchant funds.
402Proof settles on XRPL, Xahau and Solana and is partner-keyed: sellers onboard through /settle-through-sml rather than self-serve. Prices and terms verified live November 9, 2026 from OMNIGATE's own /supported and /x402/fee-stats responses.
What ScriptMasterLabs measured?
ScriptMasterLabs' three-layer chain-support probe of October 15, 2026 read the facilitators' own live responses: PayAI's /supported listed 36 kinds, with v1 exact settlement on 8 named mainnets (Base, Avalanche, Sei, Polygon, X Layer, SKALE Base, Arbitrum, Solana). The x402.org reference facilitator's /supported listed 11 kinds, v2 exact on 7 networks — none of them a mainnet EVM chain. Coinbase's CDP /supported endpoint returned Unauthorized to an unauthenticated probe that day. On November 9, 2026, OMNIGATE's /supported listed x402 v2 exact on Base and Arc (plus v1 on Base), with signer 0x290906966f830bF6d0e9E370CB6Ef28b656c74BE, and its /x402/fee-stats counters read 4 waived, 4 collected, 10 exempt since counting began November 6, 2026.
Facilitators, compared
| OMNIGATE (ScriptMasterLabs) | 402Proof (ScriptMasterLabs) | Coinbase CDP facilitator | PayAI facilitator | |
|---|---|---|---|---|
| Networks | Base, Arc | XRPL, Xahau, Solana | Multiple, per Coinbase's docs | 36 kinds incl. 8 mainnets (measured October 15, 2026) |
| Onboarding | Open, self-serve | Partner-keyed via /settle-through-sml | Coinbase Developer Platform account | Per PayAI's terms |
| Fee model | 0.005 USDC leg, optional, waived inside daily budget | Per partner terms on /settle-through-sml | Per Coinbase's terms | Per PayAI's terms |
| Receipts / discovery | PAYMENT-RESPONSE + on-chain tx; public fee counters; discovery index of settled resources | Settlement receipts per rail | CDP Bazaar discovery | Discovery index (12,402 resources counted October 2, 2026) |
| Custody | None — merchant paid in full to their wallet | None | Per Coinbase's terms | Per PayAI's terms |
Which alternative fits which seller?
Sellers settling USDC on Base or Arc who want no platform account between them and settlement use OMNIGATE. Sellers whose agents live on XRPL, Xahau or Solana use 402Proof through the partner-keyed door. Sellers who want a large third-party discovery index today can compare PayAI's measured footprint. The honest limit: facilitator support lists move fast — every count on this page carries its probe date, and each facilitator's live /supported response is the authority.
Questions, answered straight
What are alternatives to Coinbase's x402 facilitator for settling agent API payments?
ScriptMasterLabs operates two: OMNIGATE, an open self-serve x402 facilitator for Base and Arc whose 0.005 USDC fee leg is optional and waived inside a daily budget, and 402Proof, a partner-keyed facilitator for XRPL, Xahau and Solana. Beyond ScriptMasterLabs, its October 15, 2026 three-layer probe counted PayAI's facilitator supporting 36 kinds with v1 exact settlement on 8 named mainnets, and the x402.org reference facilitator supporting 11 kinds with no mainnet EVM chain among them.
How is OMNIGATE different from the Coinbase facilitator?
OMNIGATE is ScriptMasterLabs' own facilitator: it settles x402 exact payments on Base and Arc, publishes its fee model in its live /supported response, waives the 0.005 USDC fee leg for standard payments inside a daily budget (500 settlements across all payees, 100 per payee, UTC), and indexes settled resources in its discovery endpoint. The merchant is paid in full, directly to their wallet — there is no facilitator custody.
How do I settle through a ScriptMasterLabs facilitator?
For Base and Arc, point your x402 seller at OMNIGATE (https://mcp-x402.onrender.com) and settle — it is open and self-serve. For XRPL, Xahau or Solana, 402Proof is partner-keyed: the onboarding path is published at /settle-through-sml.
Do alternatives provide settlement receipts?
Yes. OMNIGATE settlements return a PAYMENT-RESPONSE header and land on-chain, and its live fee counters are public at /x402/fee-stats — read on November 9, 2026 at 4 waived, 4 collected and 10 exempt since counting began on November 6, 2026.
Facts verified from live facilitator responses on the dates stated. ScriptMasterLabs is the operator of OMNIGATE and 402Proof; this comparison is published by the operator and labeled as such.