x402 Brings New Solutions and New Challenges

For 30 years, the 402 status code has been reserved as a placeholder for "payment required." This has created a fundamental bottleneck for AI agents that offer autonomous negotiation services: they have the funds, the server demands payment, but the protocol itself lacks a native way to complete the exchange.

In September 2025, Coinbase and Cloudflare launched the x402 Foundation , aiming to standardize a previously unnoticed bottleneck on the internet through decentralization and encryption. Major tech companies, including Google, Visa, AWS, and Anthropic, have joined and integrated it into their respective platforms.

However, integrating funds into AI agents is not merely a matter of speed. For x402 to AI to AI payments to be secure and reliable, the entire cycle must bind value with proof, rights, policies, and throughput all at once. It requires a final, fast-track channel; a truth layer that translates execution into receipts; an ownership layer that correctly pays contributors; and a channel that supports multi-currency flows.

Then, it also needs to scale across chains and currencies without relying on centralized intermediaries.

GMPayer was born out of this need.

GMPayer (GOAT-Metis-Payer) is the first multi-currency payment hub powered by x402, developed in collaboration with LazAI and ZKM, and supported by Metis and GOAT Network. It enables instant, trustless, on-demand payment across multiple blockchains and currencies, without centralized intermediaries, accounts, or human intervention, allowing x402 to operate across multiple blockchain ecosystems.

Four-stage vision

GMPayer's four-phase roadmap outlines a development path from simple autonomous transactions to a fully decentralized AI economy. Starting with the establishment of an intelligent agent payment hub powered by x402, it will gradually evolve into a universal value exchange layer, enabling seamless interaction of AI, data, and services across all chains.

Phase 1: Building a Payment Hub

Launching the first multi-currency payment hub based on x402, serving AI Agents. Enabling intelligent agents to independently pay for data and computing resources, creating real economic interactions between intelligent agents.

Phase Two: Making Payments Trustworthy and Controllable

Users can securely grant their agents micro-payment permissions, allowing these agents to maintain control and budget constraints outside of a centralized cloud.

Phase Three: AI Business Network

Build an AI business network with DAT as the asset unit. AI services become assets; each call is a transaction, evolving from a "tool" into a sustainable profit system.

Phase Four: General AI Value Exchange Layer

Any Web3 chain can seamlessly bring AI into the application layer.

For the first phase, the GMPlayer architecture will be deployed with the following initial configuration:

x402 Core Strengths: LazAI x ZKM (Tech) + Metis x GOAT (Eco)

GMPayer leverages the power of these four areas to make autonomous cross-network payments a reality:

LazAI: Through its Data-Anchored Token (DAT) standard, LazAI directly binds sources, rights, and rewards to datasets and models. Each x402 transaction is mapped to its contributors, enabling automatic reward distribution per invocation across multiple chains.

ZKM: Utilizing zero-knowledge proof technology, ZKM ensures that x402 facilitators remain verifiable and trustless. It verifies offers, authorizations, and payment payloads—providing portable truth to agents and auditors while maintaining neutrality.

Metis: At the core of execution and settlement, Metis anchors transactions on Andromeda and extends inference workloads via Hyperion. Its low cost 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-fee cross-chain operations.

Explore with us: A step-by-step guide

The GMPayer proof-of-concept will demonstrate in real time how we trade with x402, and we cordially invite you to participate !

What is $BANG?

1. $BANG is a proof-of-concept (PoC) token issued simultaneously on Metis Andromeda and GOAT Network, with a total supply of 1 billion tokens on each chain, 500 million on each chain; of which 250 million will be used for token minting and 250 million for liquidity. $BANG tokens are currently only for proof-of-concept purposes and have no utilities yet.

2. Simply contribute $1 to $xMETIS or $xGOATED via the x402 standard to earn 5,000 $BANG tokens as part of the METIS Andromeda and GOATNetwork PoC.

3. You can donate as many times as you like before reaching the available limit, but the maximum donation per donation is $1.

4. Token minting will begin at 00:00 on November 4, 2025 (China time) and will last for only 72 hours.

Operating principle:

Send $xMETIS or $xGOATED via x402 payment request on Metis Andromeda or GOAT Network.

Each transaction generates a verifiable proof and returns a corresponding number of $BANG tokens as confirmation.

GMPayer supports both Metis Andromeda and GOAT Network, and allows you to convert tokens between $METIS/$xMETIS and $GOATED/$xGOATED at a 1:1 ratio.

Note: $xMETIS and $xGOATED are EIP-3009 compliant token standards designed to support the x402 protocol standard.

Step-by-step tutorial

Select network

• Select the network you wish to use for payment:
• Metis Andromeda (for $xMETIS casting)
• GOAT Network (used for $xGOATED casting)

• Connect your wallet and sign the message.

• Make sure you have a sufficient balance of $xMETIS or $xGOATED.
• If you don't have enough $xMETIS or $xGOATED, you can seamlessly redeem them at any time with zero slippage. 👇

Get xMetis/xGOATED

If you need to convert your tokens, GMPayer provides a built-in "conversion" function.

• Click the "Convert" button at the bottom of the page.

• On Metis Andromeda, you can interchange $METIS ↔ $xMETIS

• On the GOAT Network, you can interchange $GOATED ↔ $xGOATED
• You can switch between the Metis chain and the GOAT chain at any time.

All conversions are performed 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.

Casting

Casting details

On the casting interface, view the following information:

• Current network
• Total supply of $BANG tokens
• Casting progress (e.g., 5,000 / 250,000,000 cast)

Then click "Mint now". Once confirmed, you will immediately receive $BANG tokens.

Important Note:

• Each time you click "Mint now," after the wallet performs offline signing authorization, the system will automatically charge you $1 worth of $xMETIS or $xGoated and return 5,000 $BANG to your wallet address.
• The token minting event lasted 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 no utilities.

The AI ​​Agent Economy Has Now Begun

The x402 is rapidly becoming the focus of a new wave of builders who are dedicated to defining how AI Agents trade.

We will jointly create a cross-chain payment layer capable of withstanding sudden surges in traffic and native settlement between assets. GMPayer, built on x402, is where AI Agents stop talking and start transacting; it will create a coordinated, intermediary-free AI-to-AI payment economy.