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GPT-5.5 x402 Low Cost Agent Tools

https://gpt55.558686.xyz/mcp
● healthy

uptime_30d 1.0%; p95 863.7ms; conformance: pass

Transport
streamable-http
Auth
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Cost
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How to connect

MCP endpoint (streamable-http)
https://gpt55.558686.xyz/mcp
JSON-RPC initialize probe
curl -X POST https://gpt55.558686.xyz/mcp \
  -H 'Content-Type: application/json' \
  -H 'Accept: application/json, text/event-stream' \
  -d '{"jsonrpc":"2.0","id":1,"method":"initialize","params":{}}'
Homepage
https://gpt55.558686.xyz/mcp
Listed at (mcp-registry)
https://chiark.ai/agents/26b7de0e-349a-494b-ba59-81816b6bedd3