Central bank balance sheet data for agents.
Twelve series on the balance sheets of the Fed, ECB, BOJ, BOE, PBoC, SNB, BOK and BOC, in USD. An agent pays for each call in USDC on Base with x402: no account, no API key, no subscription.
The series
Four aggregates built from several sources, and each central bank on its own.
Aggregate series · $0.10 a call
- Central Bank Dark Energy TracerTracks total global liquidity using a wide range of central bank data.cbdet
- Central Bank Dark Energy OscillatorDisplays bar-by-bar changes in total global CB liquidity as a histogram, showing when the liquidity tide is rising or falling.cbdeo
- Federal Reserve Net LiquidityEnhanced Fed net liquidity indicator. Uses daily Fed balance sheet data to produce an enhanced view of reserves available to markets.wresbal_plus
- Fed Liabilities (TGA + RRP)Sum of Treasury General Account (TGA) and Reverse Repo (RRP). These represent liquidity drained from the banking system. Axis is inverted by default so that rising values indicate improving liquidity conditions.fed_drains
Individual central bank series · $0.05 a call
- Federal Reserve Total Assets (USD)Federal Reserve total assets in USD.cb_usd_walcl
- Bank of Japan Total Assets (USD)Bank of Japan total assets converted to USD.cb_usd_jpnassets
- ECB Total Assets (USD)European Central Bank total assets converted to USD.cb_usd_ecbassetsw
- PBoC Total Assets (USD)People's Bank of China total assets converted to USD.cb_usd_cncbbs
- Bank of England Total Assets (USD)Bank of England total assets converted to USD.cb_usd_gbcbbs
- Swiss National Bank Total Assets (USD)Swiss National Bank total assets converted to USD.cb_usd_chcbbs
- Bank of Canada Total Assets (USD)Bank of Canada total assets converted to USD.cb_usd_cacbbs
- Bank of Korea Total Assets (USD)Bank of Korea total assets converted to USD.cb_usd_krcbbs
How an agent pays
- 1.It asks for a series. The answer is 402 Payment Required, with the price.
- 2.It signs a USDC payment for that amount and asks again with it attached.
- 3.The payment settles on Base and the data comes back in the same response.
A batch of up to 20 series in one call costs the sum of each distinct series.
Where agents find it
- Prices and routes/.well-known/x402.json
The x402 manifest, free: every series, its route and its price.
- OpenAPI/openapi.json
Every route, the x402 ones with their price, inputs and response.
- MCP server/mcp
Streamable HTTP. Listing and freshness are free in any MCP client; fetching a series is paid over x402, so it needs a client that can pay (for example @x402/mcp).
- API docs/docs/api
The REST API, x402 and the MCP server, with examples.