x402 Brings New Solutions and New Challenges
For 30 years, status code 402 has been reserved as a placeholder for "Payment Required." This creates a fundamental bottleneck for AI Agents that autonomously negotiate services: they have funds, servers require payment, but the protocol itself lacks a native way to complete the exchange.
Coinbase and Cloudflare established the x402 Foundation in September 2025 to standardize solutions for an unnoticed bottleneck on the internet through decentralized and cryptographic technologies. Major tech companies, including Google, Visa, AWS, and Anthropic, have joined and integrated it into their respective platforms.
However, connecting funds to AI agents is not just a matter of speed. For x402 to enable secure and reliable AI-to-AI payments, the entire loop must bind value with proof, rights, policies, and throughput all at once. It requires a fast track with finality, a truth layer that converts execution into receipts, an ownership layer that correctly pays contributors, and a channel that supports multi-currency liquidity.
Then, it also needs to scale across chains and currencies, without relying on centralized intermediaries.
GMPayer Emerges
GMPayer (GOAT-Metis-Payer) is the first multi-currency payment hub powered by x402, developed in collaboration between LazAI and ZKM, with joint support from Metis and GOAT Network. It enables instant, trustless pay-per-request functionality across multiple blockchains and currencies, without centralized intermediaries, accounts, or manual intervention, allowing x402 to operate within various blockchain ecosystems.
Four-Phase Vision
GMPayer's four-phase roadmap outlines the development path from simple autonomous transactions to a fully decentralized AI economy. It starts with establishing an x402-powered agent payment hub and gradually evolves into a universal value exchange layer, allowing AI, data, and services to interact seamlessly across all chains.
Phase One: Build the Payment Hub
Launch the first multi-currency payment hub based on x402, serving AI Agents. This enables agents to independently pay for data and computing resources, creating real economic interactions between agents.
Phase Two: Make Payments Trustworthy and Controllable
Users can securely grant their agents small payment permissions, allowing these agents to maintain control and budget limits outside of centralized clouds.
Phase Three: AI Business Network
Build an AI business network with DAT as the asset unit. AI services become assets; each invocation is a transaction, evolving from "tools" into a sustainable profit system.
Phase Four: Universal AI Value Exchange Layer
Any Web3 chain can seamlessly introduce AI into the application layer.
For Phase One, the GMPayer architecture will be deployed with the following initial configuration:
x402 Core Strength: LazAI x ZKM (Tech) + Metis x GOAT (Eco)
GMPayer leverages the strengths of these four domains to make autonomous cross-network payments a reality:
LazAI: Through its Data Anchored Token (DAT) standard, LazAI directly binds sources, rights, and revenues to datasets and models. Each x402 transaction maps to its contributors, enabling automatic cross-chain revenue distribution per invocation.
ZKM: Utilizing zero-knowledge proof technology, ZKM ensures that x402 facilitators maintain verifiability and trustless characteristics. It verifies quotes, authorizations, and payment loads—providing portable truths for agents and auditors while maintaining neutrality.
Metis: As the core of execution and settlement, Metis anchors transactions on Andromeda and extends reasoning workloads through Hyperion. Its low fees and fast finality make x402 microtransactions economically viable.
GOAT: As a native Bitcoin settlement layer, GOAT introduces EIP-3009 support and zkRollup infrastructure to bridge stablecoins and Bitcoin between GOAT and Metis with ultra-low fees for cross-chain operations.
Join Us in Pioneering: Step-by-Step Guide
The GMPayer proof of concept will demonstrate in real-time how we transact via x402, we invite you to participate!
What is $BANG?
$BANG is a proof of concept (PoC) token issued simultaneously on Metis Andromeda and GOAT Network, with a total supply of 1 billion on each chain, 500 million on each chain; of which 250 million on each chain will be for token minting and 250 million for liquidity. The $BANG token is currently only for proof of concept, with no utilities available.
By contributing $1 through the x402 standard in $xMETIS or $xGOATED, you will receive 5,000 $BANG tokens as part of the METIS Andromeda and GOAT Network PoC.
You can contribute any number of times until the available limit is reached, but the maximum contribution per transaction is $1.
Token minting will begin at 12:00 AM China time on November 4, 2025, and will last for only 72 hours.
How It Works:
Send $xMETIS or $xGOATED via x402 payment requests on Metis Andromeda or GOAT Network.
Each transaction will generate a verifiable proof and return the corresponding amount of $BANG tokens as confirmation.
GMPayer supports both Metis Andromeda and GOAT Network, allowing you to convert tokens between $METIS/$xMETIS and $GOATED/$xGOATED at a 1:1 ratio.
Note: $xMETIS and $xGOATED are EIP-3009 compatible token standards designed to support the x402 protocol standard.
Step-by-Step Tutorial
Choose Network
- Select the network you wish to use for payment:
- Metis Andromeda (for $xMETIS minting)
- GOAT Network (for $xGOATED minting)
- Connect your wallet and sign the message.
- Ensure you have enough $xMETIS or $xGOATED balance.
- If you do not have enough $xMETIS or $xGOATED, you can seamlessly exchange $METIS or $GOATED for them at zero slippage. 👇
Get xMetis/xGOATED
If you need to convert your tokens, GMPayer provides a built-in "Convert" feature.
- Click the "Convert" button at the bottom of the page.
- On Metis Andromeda, you can swap $METIS ↔ $xMETIS.
- On GOAT Network, you can swap $GOATED ↔ $xGOATED.
- You can switch between the Metis chain and the GOAT chain at any time.
All conversions are done at a 1:1 ratio, with no hidden fees and zero slippage. $xMETIS and $xGOATED use EIP-3009 to comply with the x402 protocol's payment token standard.
On the conversion page, enter the amount you wish to convert and confirm. Once the transaction is complete, your wallet will immediately receive the equivalent amount of $xMETIS or $xGOATED.
Minting Process
Minting Details
On the minting interface, view the following information:
- Current network
- Total supply of $BANG tokens
- Minting progress (e.g., 5,000 / 25,000,000 minted)
Then click "Mint now." Once confirmed, you will immediately receive $BANG tokens.
Important Notes:
- Each time you click "Mint now," after offline signature authorization in your wallet, the system will automatically deduct $1 worth of $xMETIS or $xGOATED and return 5,000 $BANG to your wallet address.
- The token minting event lasts for only 72 hours.
Important Disclaimer: $BANG is a proof of concept token issued simultaneously on Metis Andromeda and GOAT Network, with a total supply of 1 billion (50% on each chain), and currently has no utilities.
AI Agent Economy is Now Live
x402 is rapidly becoming the focus of a new wave of builders dedicated to defining the transaction methods of AI Agents.
Together, we will create a cross-chain payment layer with burst traffic throughput and native settlement between assets. GMPayer, built on x402, is where AI Agents stop talking and start transacting, creating a payment economy for AI-to-AI interactions without intermediaries and with coordinated consistency.
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