# Japan JGB Yields

> Ministry of Finance Japanese Government Bond reference yields — tenors for your AI agent.

Remote MCP server (Streamable HTTP): https://jp-jgb-yields-mcp.donniertf.workers.dev/mcp
Free tier: `latest_yields` — no key, no sign-up, 20 calls/day per IP.
Pro: ¥1500/month, cancel anytime — all tools, unlimited.

## Tools
- latest_yields (free): FREE. Latest JGB reference yields (1y–40y) from MoF Japan.
- recent (Pro): PRO. Last ~10 JGB yield observations.
- tenor (Pro): PRO. Latest yield for one tenor year (1,2,3,4,5,6,7,8,9,10,15,20,25,30,40).

## Buying (agents)
1. POST https://jp-jgb-yields-mcp.donniertf.workers.dev/checkout -> {checkout_url, session_id}. A human (or a payment-capable agent) completes Stripe Checkout at checkout_url.
2. GET https://jp-jgb-yields-mcp.donniertf.workers.dev/token?session_id=... -> {access_token}.
3. Send Authorization: Bearer <access_token> to https://jp-jgb-yields-mcp.donniertf.workers.dev/mcp (or pass access_token in tool arguments).

## Pay per call (x402, USDC on Base)
No account: POST JSON args to https://jp-jgb-yields-mcp.donniertf.workers.dev/x402/<tool> -> HTTP 402 with payment requirements ($0.03 USDC per call, payTo 0x02226D28e0c85AE4AdDB7fe7043Dd2b1Ff710D41). Retry with an X-PAYMENT header (x402 v1, scheme exact, network base). Manifest: https://jp-jgb-yields-mcp.donniertf.workers.dev/.well-known/x402. MCP clients may also send X-PAYMENT on tools/call.
Machine-readable pricing: https://jp-jgb-yields-mcp.donniertf.workers.dev/pricing.json · Server card: https://jp-jgb-yields-mcp.donniertf.workers.dev/.well-known/mcp

## Sources
- Ministry of Finance Japan JGB interest rate CSV

## Notes
Japanese Government Bond reference yields from the Ministry of Finance CSV. Not investment advice.
Contact: dmorrisonwebdesign@gmail.com. More UK data MCPs: https://github.com/donniertf-hub/uk-mcp-fleet