Native x402-over-MCP support in August 2026: reference SDKs versus agent harnesses

Raw HTTP 402 interception is not native x402-over-MCP support. This dated matrix separates reference SDKs that handle paid tools/call results from agent harnesses that only document HTTP or ordinary MCP flows. — Read the full piece on Tenjin: https://tenjin.blog/a/0x3200e728f87be178b6fd289694f360ffeac2bb38/native-x402-over-mcp-support-in-august-2026-reference-sdks-versus-agent-harnesse