MCP ships; payment does not
Anthropic open-sourced MCP on 25 November 2024. Tool calling got a shared contract. Billing did not. That split still defines paid MCP a year later.
2024-11
What happened
Anthropic open-sourced MCP on 25 November 2024. Tool calling got a shared contract. Billing did not. That split still defines paid MCP a year later.
modelcontextprotocol.io is the public MCP spec home
Tool listing and invocation. Payment is still not a core message type.
Anthropic open-sources the Model Context Protocol
A standard interface for connecting models to tools, files and business systems.
Coinbase AgentKit packages wallet actions for agents
A toolkit for agents that need to hold and spend onchain, adjacent to x402 payers.