"Spring" matching MCP connectors:

Signal SprintA

space.manus.signalsprint-mqysbksh

Paid x402 MCP utilities for Base-USDC balances, blocks, gas, HTTPS headers, and agent profile bios.

SpringRollA

io.github.springrolldev

Register, deploy, review, and govern internal applications built with coding agents.

STRING Database MCP ServerA

org.string-db

Query STRING interactions, enrichment, annotations, homology, and PPI networks.

Pay-per-use weather, environment, finance, and on-chain intelligence tools for AI agents via x402.

AI research reports: market analysis, competitor intel, blog posts. USDC payment.