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← US Treasury Fiscal Data
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Average interest rates

Average interest rates on marketable and non-marketable Treasury securities.

Average interest rates Free

Average interest rates on marketable and non-marketable Treasury securities.

cost
Free then $0.001 / call
MCP tool
us-treasury__avg-interest-rates
method
GET

Free up to 50 calls a day over MCP (500 with a free key), then $0.001 per call by card credit or USDC. Free key · Pay by card

GET https://fourzerotwo.si/v1/us-treasury/avg-interest-rates

# free: send a free key from https://fourzerotwo.si/free
curl -H "X-API-Key: fzt_…" "https://fourzerotwo.si/v1/us-treasury/avg-interest-rates"

# no key: returns 402 with the price, for x402 agents
curl -i "https://fourzerotwo.si/v1/us-treasury/avg-interest-rates"

by fourzerotwo

Report this endpoint

Use it from an AI agent (MCP)

Add the server once, then ask for this data in plain English. The agent finds the endpoint with search_apis and runs it with call_api.

{
  "mcpServers": {
    "fourzerotwo": { "type": "http", "url": "https://fourzerotwo.si/mcp" }
  }
}
# the call the agent makes
call_api {"tool": "us-treasury__avg-interest-rates", "arguments": {}}

More from US Treasury Fiscal Data

Source: U.S. Department of the Treasury, Fiscal Data. Public domain.