Claude.ai Maxwell Directory (x402 + MCP) Prompt/x402_payment_failed
How to: Claude.ai Maxwell Directory (x402 + MCP) x402_payment_failed
Add Maxwell Directory (x402 + MCP) to Claude.ai
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01
Open Settings → Connectors → Add custom connector and merge this in. Keep any servers already there.
https://api.maxwellinternational.ai/mcp-
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Save the file and restart Claude.ai.
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x402_payment_failed is surfaced in the connector's menu once the server is linked. Unlike a tool, you invoke it deliberately — Claude.ai will not call it for you.
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If it does not appear, check that Maxwell Directory (x402 + MCP) is connected and that you are looking at its prompts rather than its tools.
Claude on the web takes a remote URL and completes OAuth in the browser. For a packaged server use Claude Desktop or Claude Code instead. Claude.ai docs
Set these first
Maxwell Directory (x402 + MCP) will not start until these are set, so it never reaches Claude.ai.
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MAXWELL_WALLET_KEY_FILE -
MAXWELL_SOLANA_KEY_FILE -
MAXWELL_MAX_PER_CALL_USD -
MAXWELL_DAILY_BUDGET_USD
Same prompt, other clients
Read from the server itself, by connecting to it and calling prompts/list on 30 September 2026.
A listing does not declare its prompts, so asking is the only way to know them, and this
is what the server actually offers rather than what its listing claims. Names only are
stored; connect the server for each prompt's arguments.