A Fed Funds monthly rate API returns FRED’s monthly average under FED_FUNDS (stored on the first of the month). The daily series is FED_FUNDS_DAILY — a different symbol. On Interest Rates API: GET /api/v1/latest?symbols=FED_FUNDS with query api_key.
Starter is $19/mo (250 calls, 1 symbol per request, 90-day range) with a 7-day trial. MCP: interestratesapi.com/mcp. This is not a US 10Y Treasury H1.
Request: monthly Fed Funds
curl "https://interestratesapi.com/api/v1/latest?symbols=FED_FUNDS&api_key=YOUR_API_KEY"Response: official Latest mix (2026-04-20)
Starter should request one symbol. The published four-symbol mix is what Professional and above may request together:
{
"success": true,
"date": "2026-04-20",
"rates": {
"FED_FUNDS": 4.33,
"SOFR": 4.31
},
"dates": {
"FED_FUNDS": "2026-04-20",
"SOFR": "2026-04-19"
},
"currencies": {
"FED_FUNDS": "USD",
"SOFR": "USD"
}
}FED_FUNDS is 4.33 in that fixture. Historical docs also show 5.33 stored on 2025-09-01 when querying 2025-09-15. Copy the curl for today’s monthly print.
Go live
1. Register — 7-day trial.
2. Copy api_key.
3. GET latest with symbols=FED_FUNDS only on Starter.
4. Read rates.FED_FUNDS and dates.FED_FUNDS.
