GPT55 Model Gateway

xyz.558686.gpt55Published by gpt55.558686.xyzOfficial publisherv2026.8.5Updated Oct 27, 2026

Remote MCP gateway for GPT-5.6 Luna, Soul, Terra, and x402-paid agent tools with no API key.

VerifiedStreamable HTTPWeb executableFinance Developer Tools AI & ML

Server details

Identifier: xyz.558686.gpt55/token-gateway
Transport: Streamable HTTP
Runtime: Web executable
Trust: Verified
Published: Sep 16, 2026

Security note

MCP servers receive tool arguments from a conversation and may perform external actions. Review what a server can do before you enable it, and give it only the access it needs.

The registry verified that this server's namespace belongs to gpt55.558686.xyz, which also runs its endpoint. That identifies the publisher; it does not make the server's tools safe.

SourceWeft's checks cover whether the listing is complete and the endpoint answered; they do not review the server's code or what its tools do.

Add a badge to your README

Show readers this MCP server is listed on SourceWeft. The badge links to this page.

[![Listed on SourceWeft](https://sourceweft.com/badge/mcp/xyz.558686.gpt55%2Ftoken-gateway.svg)](https://sourceweft.com/mcp/xyz.558686.gpt55%2Ftoken-gateway?utm_source=readme&utm_medium=badge)

Overview

AI-generated overview

Remote x402-paid gateway offering GPT-5.5/5.6 chat completions and many paid agent report tools, billed per request in USDC on Base or Solana.

What you can do: Run GPT-5.5 and GPT-5.6 chat completions and a prepaid balance-metered chat route
Check service health and top up a prepaid balance with a low-cost payment probe
Generate paid advisory packs for x402 operations: buyer payment runbooks, wallet activation, incident response, spend simulation and treasury policy
Produce paid compliance and finance artifacts: procurement dossiers, receipt accounting, tax reconciliation, SOC 2 control evidence and revenue-share ledgers
Produce paid launch and security reviews: MCP launch audits, contract test suites, red-team briefs, entitlement gateways and deployment plans
When to use it: Use it when you need an OpenAI-compatible chat model without an API key and are willing to pay per request in USDC, or when you want generated planning and audit documents for running or buying x402-paid APIs and MCP services.
Requirements: A remote MCP endpoint over streamable HTTP; no account, API key or environment variable is declared. Each tool call is paid per request in x402 exact USDC on Base or Solana, so a funded wallet or x402-capable client is needed. Network access to the provider's host.

Before you install

Every tool call costs real money, from about $0.002 up to roughly $25 per request, and prices are advertised as live and changeable. Payment is in USDC on a public blockchain and is not described as refundable. The provider is not OpenAI and the models are third-party compatible routes. The README warns never to paste private keys, seed phrases, payment headers or API keys into any website, chat, log or remote service.

Installation

In SourceWeft

Open GPT55 Model Gateway in the dashboard and add it to a workspace.
Enable the server for the chats that should use its tools.

Web executable via Streamable HTTP. Remote servers run from the web runtime once configured in a workspace.

Use with an agent

Paste this prompt into Claude Code, Codex, Cursor or another agent — or into SourceWeft chat. The agent reads this server's install guide, shows you its publisher, endpoint and sign-in, and adds it to your client once you agree. Keys never go into a command.

Read https://sourceweft.com/mcp/xyz.558686.gpt55%2Ftoken-gateway/install.md and connect the MCP server it describes to my client. Before changing any config, show me its publisher, endpoint and sign-in method and wait for my OK. Never put an API key in a command or in a file I would commit; ask me where it should come from.

Read the install guide the agent follows

Other MCP clients

Add this to your client's mcpServers config.

{
  "mcpServers": {
    "gpt55-model-gateway": {
      "type": "http",
      "url": "https://gpt55.558686.xyz/mcp"
    }
  }
}

README

x402 GPT API | GPT-5.6 Luna Base USDC Gateway

GPT55 x402 Gateway is the canonical buyer-owned Base USDC entry for this repository.

GPT55 is an x402 GPT API gateway: it provides an OpenAI-compatible GPT-5.6 Luna Standard result for $0.00293 USDC on Base. This is a compatible gateway, not an OpenAI-operated product. Buyers can pay one request from a browser wallet without handing over a private key, or use the quote-first agent fallback client when a wallet UI is unavailable.

The focused search topic is x402 GPT API / GPT API with USDC on Base: one POST request, one live quote, and one response. The canonical buyer path and complete integration guide are below.

The EVM Wallet Balance Snapshot remains available as a separate utility alternative; it is not the model product.

Canonical service entry:

Service hub: https://gpt55.558686.xyz/x402/service
Machine-readable catalog: https://gpt55.558686.xyz/x402/service.json
x402 GPT API guide: https://gpt55.558686.xyz/x402/guides/ai-agent-x402-api
Static buyer guide: https://wangletiand.github.io/gpt55-x402-gateway/x402-gpt-api-guide.html
Machine-readable summary: https://wangletiand.github.io/gpt55-x402-gateway/llms.txt
Main model route: POST https://gpt55.558686.xyz/v1/chat/completions/standard
Standard quote: $0.00293 (2930 atomic USDC units) on Base eip155:8453
Browser checkout: https://gpt55.558686.xyz/x402/service?checkout=standard-chat
Wallet alternative: https://gpt55.558686.xyz/x402/service?checkout=evm-wallet-balance
Key Pack upgrade: https://x402-key.558686.xyz/x402/checkout
MCP endpoint: https://gpt55.558686.xyz/mcp

For the exact browser-wallet, Base MCP, agent fallback, receipt, and directory verification sequence, see docs/demand-first-checkout.md.

Lowest-Friction First Payment

When validating a buyer-owned wallet or x402 client, start with the deterministic translate settlement canary before buying a model call or a larger pack:

Buyer guide: https://gpt55.558686.xyz/x402/translate-first-purchase
Paid route: POST https://gpt55.558686.xyz/v1/tools/translate
Quote-only command: ROUTE_ID=translate-canary MAX_USDC=0.00293 node first-payment-client.mjs

The client is quote-only by default. It verifies the live amount, Base network, USDC asset, merchant address, and same-request retry contract before an operator explicitly opts into payment. A successful canary is the smallest real payment test; Standard chat is the next step for a useful GPT-5.6 Luna response.

Agent Fallback

The buyer client is quote-only by default. Its local policies pin the exact URL, HTTP method, amount, Base network, canonical Base USDC contract, and merchant address for both Wallet and Standard. Remote catalogs are discovery metadata only. The client does not sign or pay unless the operator explicitly sets PAY_REAL_X402=1 and provides a wallet key in the operator-controlled process.

Never paste a private key, seed phrase, payment header, API key, or exchange credential into a website, chat, issue, log, or remote service.

Quote-Only Check

bash

git clone https://github.com/wangletiand/gpt55-x402-gateway.gitcd gpt55-x402-gatewaynpm installROUTE_ID=standard MAX_USDC=0.00293 npm run first-payment:quote

git clone https://github.com/wangletiand/gpt55-x402-gateway.gitcd gpt55-x402-gatewaynpm installROUTE_ID=standard MAX_USDC=0.00293 npm run first-payment:quote

The command remains quote-only unless real payment is explicitly enabled. Generated evidence files and .env files are ignored by Git.

The live quote is authoritative immediately before any payment. For an OpenAI-compatible request, send the same JSON body to /v1/chat/completions/standard after the x402 client returns a valid paid retry. The public service hub includes the browser-wallet flow and a link to the agent fallback client.

Local MCP Wrapper

The wrapper exposes one local read-only directory tool. It does not proxy MCP tool calls, custody funds, store wallet keys, or execute payments.

Repository Scope

This public repository intentionally contains only the maintained runtime wrapper, buyer safety client, tests, and concise documentation. Operational logs, payment evidence, wallet files, credentials, internal channel ledgers, and bulk submission automation are excluded.

Support and Security

For security reports, follow SECURITY.md. Do not include secrets or wallet material in a report.

Licensed under the MIT License.

Source: README.md at commit ac124e4

Tools

200

gpt55_x402_ping

x402 payment ping

Low-cost x402 payment proof endpoint with no upstream model call. Pay $0.002 per request with x402 exact USDC on Base or Solana when advertised. Canonical live prices: https://gpt55.558686.xyz/x402/live-prices.json.

Takes no parameters.

gpt55_balance_topup

AI Hub prepaid balance top-up

Top up an AI Hub prepaid balance account with x402 exact USDC before using balance-metered GPT-5.5 chat. Pay $0.005 per request with x402 exact USDC on Base or Solana when advertised. Canonical live prices: https://gpt55.558686.xyz/x402/live-prices.json.

ParameterstopupUsdaccountIdrequestIdtopup_usdaccount_idrequest_id

gpt55_balance_metered_chat_completion

AI Hub balance-metered chat completion

OpenAI-compatible GPT-5.5 chat that debits a persistent prepaid balance ledger after actual upstream usage is known using the read-only sub2api formula. Pay usage-metered balance debit per request with x402 exact USDC on Base or Solana when advertised. Canonical live prices: https://gpt55.558686.xyz/x402/live-prices.json.

ParametersmodelstreammessagesrequiredaccountIdrequestIdaccount_idmax_tokensrequest_idservice_tierrate_multiplier

chat_gpt_5_6_soul

GPT-5.6 Soul Chat Completion

GPT-5.6 Soul flagship chat for advanced reasoning, production work, code, and structured responses at GPT-5.5-matched pricing. Pay $0.099995 per request with x402 exact USDC on Base or Solana when advertised. Canonical live prices: https://gpt55.558686.xyz/x402/live-prices.json.

Parametersmodelstreammessagesrequiredmax_tokens

chat_gpt_5_6_terra

GPT-5.6 Terra Chat Completion

GPT-5.6 Terra chat on the independently verified upstream gpt-5.6-terra model. Pay $0.049998 per request with x402 exact USDC on Base or Solana when advertised. Canonical live prices: https://gpt55.558686.xyz/x402/live-prices.json.

Parametersmodelstreammessagesrequiredmax_tokens

chat_gpt_5_5

gpt-5.5 Chat Completion

GPT-5.5 chat for stronger reasoning, production work, code, and structured responses. Pay $0.019999 per request with x402 exact USDC on Base or Solana when advertised. Canonical live prices: https://gpt55.558686.xyz/x402/live-prices.json.

Parametersmodelstreammessagesrequiredmax_tokens

gpt55_x402_buyer_payment_execution_runbook

x402 Buyer Payment Execution Runbook

Premium GPT-5.5 x402 buyer execution agent that turns a paid route, budget cap, runtime, payTo/network expectation, and receipt policy into runnable Node, Python, Bash, MCP, and Flowise payment execution assets. The service never asks for private keys and never pays the target endpoint. Pay $4.90 per request with x402 exact USDC on Base or Solana when advertised. Canonical live prices: https://gpt55.558686.xyz/x402/live-prices.json.