gpt55-token-gateway

GPT55 x402 Gateway MCP Server

Remote Model Context Protocol server at https://gpt55.558686.xyz/mcp (Streamable HTTP; a GET returns the server.json-shaped manifest and /mcp/sse streams the discovery config). Probed anonymously on 2026-09-20: initialize answered protocolVersion 2025-06-18, serverInfo {gpt55-x402-gateway, "GPT-5.5 x402 Agent Payment Control Plane", 2026.06.21}, capabilities tools + resources; tools/list returned 218 tools, each with a JSON Schema inputSchema and MCP annotations; resources/list returned 14 JSON resources (x402 discovery, live prices, pricing, buyer guide, agent card, openapi). The server's own instructions state that it is a facade: a tool call returns the direct HTTP endpoint, the x402 payment requirements and an example payload, and the caller must execute that HTTP endpoint with x402 Base USDC payment or a private Bearer key - "this MCP facade does not bypass payment". Registered-shape server.json at /server.json and /.well-known/mcp.json (name gpt55-model-gateway, version 2026.07.01-split) and a SEP-1649 server card at /.well-known/mcp/server-card.json (xyz.558686.gpt55/token-gateway); no entry was found in the official MCP registry and the install guide says no marketplace submission has been made.

GitHub

Documentation

📖
Documentation
https://gpt55.558686.xyz/llms-install.md

Other Resources

🔗
MCPServer
https://raw.githubusercontent.com/api-evangelist/558686-xyz/refs/heads/main/mcp/558686-xyz-mcp.yml
🔗
MCPServer
https://gpt55.558686.xyz/mcp
🔗
ToolCrosswalk
https://raw.githubusercontent.com/api-evangelist/558686-xyz/refs/heads/main/mcp/558686-xyz-tool-crosswalk.yml

Work with this as data

Every API here is available over the APIs.io API and to AI agents over MCP.

MCP server

One button, every client — Claude, Cursor, VS Code and the rest.

https://apis.io/mcp

Tools for apis

7 MCP tools reach this
  • find_apisBrowse and filter every API in the catalog.
  • get_api_artifactsOne API's artifacts, grouped by type.
  • get_openapiThe primary OpenAPI for this API.
  • find_similar_apisAPIs that look like this one.
  • apis_io_searchSTART HERE — APIs, providers and tags for one query, each with its total.
  • resolveTurn a domain, URL or GitHub org into the provider it belongs to.
  • find_cohortsEvery scored population of providers in the catalog.
All 92 tools →

Call it yourself

curl for this page
This API 
curl "https://apis.io/api/v1/apis/gpt55-mcp-server"
All apis 
curl "https://apis.io/api/v1/apis?limit=25"

Discovery needs no key. Ratings and market analysis are Pro.

Get an API key

Free tier, no form to fill in. Signing in shares your email address with us — we store it to create your key and to recognise you if you sign in with another provider. See our Privacy Policy and Terms.

GitHub Google LinkedIn

A second provider on the same verified email joins the account you already have.

API entry from apis.yml

apis.yml Raw ↑ 
aid: 558686-xyz:gpt55-mcp-server
name: GPT55 x402 Gateway MCP Server
description: 'Remote Model Context Protocol server at https://gpt55.558686.xyz/mcp (Streamable HTTP; a
  GET returns the server.json-shaped manifest and /mcp/sse streams the discovery config). Probed anonymously
  on 2026-09-20: initialize answered protocolVersion 2025-06-18, serverInfo {gpt55-x402-gateway, "GPT-5.5
  x402 Agent Payment Control Plane", 2026.06.21}, capabilities tools + resources; tools/list returned
  218 tools, each with a JSON Schema inputSchema and MCP annotations; resources/list returned 14 JSON
  resources (x402 discovery, live prices, pricing, buyer guide, agent card, openapi). The server''s own
  instructions state that it is a facade: a tool call returns the direct HTTP endpoint, the x402 payment
  requirements and an example payload, and the caller must execute that HTTP endpoint with x402 Base USDC
  payment or a private Bearer key - "this MCP facade does not bypass payment". Registered-shape server.json
  at /server.json and /.well-known/mcp.json (name gpt55-model-gateway, version 2026.07.01-split) and a
  SEP-1649 server card at /.well-known/mcp/server-card.json (xyz.558686.gpt55/token-gateway); no entry
  was found in the official MCP registry and the install guide says no marketplace submission has been
  made.'
humanURL: https://gpt55.558686.xyz/projects/558686/install
baseURL: https://gpt55.558686.xyz/mcp
tags:
- MCP
- x402
- AI Agents
properties:
- type: MCPServer
  url: mcp/558686-xyz-mcp.yml
- type: MCPServer
  name: GPT55 remote MCP endpoint (Streamable HTTP)
  url: https://gpt55.558686.xyz/mcp
- type: ToolCrosswalk
  url: mcp/558686-xyz-tool-crosswalk.yml
- type: Documentation
  url: https://gpt55.558686.xyz/llms-install.md