Circle launches the Arc public testnet
Issuer infrastructure moved from blog to a public test network.
2025-10
What happened
MCP servers and SDKs continued to ship while paid-MCP remained an overlay. Developers could expose tools faster than they could meter them. The unmet need is metering, not another tool schema.
Tool protocols outrun payment overlays
MCP servers and SDKs continued to ship while paid-MCP remained an overlay. Developers could expose tools faster than they could meter them. The unmet need is metering, not another tool schema.
MCP TypeScript SDK becomes the default client and server kit
Official SDK cadence is a leading indicator of paid-MCP readiness.