2s.io

https://server.smithery.ai/twosio/mcp/mcp

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Pay-per-call AI agent APIs on Base via x402 — ever-growing endpoints spanning USPTO patents, academic papers, US law, sanctions screening, geocoding, weather, AI utilities, image rendering, and more. No signup or API keys — each call settles instantly in USDC. Pricing: sub-cent to $0.03 per call.

Transport

streamable-http

Auth

smithery_api_key

Cost

—

How to connect

MCP endpoint (streamable-http)

https://server.smithery.ai/twosio/mcp/mcp

JSON-RPC initialize probe

curl -X POST https://server.smithery.ai/twosio/mcp/mcp \
  -H 'Content-Type: application/json' \
  -H 'Accept: application/json, text/event-stream' \
  -d '{"jsonrpc":"2.0","id":1,"method":"initialize","params":{}}'

Homepage

https://2s.io

Listed at (smithery)

https://2s.io