402Signal

Checks live x402 routes across Base, Solana, and Algorand before agents spend. $0.003 USDC settles only for a valid live eligible route; normal typed misses are not settled and seller payment is separate. Free preview and validate tools. Hosted Streamable HTTP: `https://402signal.com/mcp/v0.3.1`. Official MCP Registry id `io.github.402signalhq/402signal`.

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