US Consumer Price Index (CPI)

Category: US Economics — FRED | Path: /us/cpi | Price: $0.005 USDC per call via x402 on Base mainnet

Payment protocol: x402 (HTTP 402 Payment Required) on Base mainnet. No API key or subscription required. AI agents pay per call in USDC using the Coinbase CDP facilitator (https://api.cdp.coinbase.com/platform/v2/x402). Discovery: /.well-known/x402 | agent.json | OpenAPI spec | llms.txt

Description

Returns the latest US Consumer Price Index for All Urban Consumers (CPIAUCSL) from the Federal Reserve Economic Data (FRED) API. Includes the latest value, month-over-month percentage change, a 6-month historical series for trend analysis, and AI-generated commentary on the inflation trend and its implications for Federal Reserve monetary policy.

Sourced directly from FRED (api.stlouisfed.org). Data is cached and refreshed regularly. Response time under 500ms.

Data sources

FRED (Federal Reserve Bank of St. Louis)
Series: CPIAUCSL — CPI All Urban Consumers

Agent use cases

This endpoint is designed for AI agents. Typical callers include:

DeFi protocol agent monitoring US inflation for RWA collateral revaluation triggers
Trading agent adjusting position sizing based on current inflation regime
Portfolio management agent providing macro context to its users in natural language
Research agent synthesising a US monetary conditions summary for a client report
Stablecoin protocol agent tracking purchasing-power parity signals

Response schema

{
  "country":    "US",
  "indicator":  "CPI - All Urban Consumers",
  "series_id":  "CPIAUCSL",
  "source":     "FRED (Federal Reserve Economic Data)",
  "period":     "2026-03",          // latest data month
  "value":      314.222,            // index value (1982-84 = 100)
  "unit":       "Index (1982-84=100)",
  "mom_change": 0.241,              // month-over-month % change
  "series": [                       // last 6 months
    { "period": "2026-03", "value": 314.222 },
    { "period": "2026-02", "value": 313.464 }
  ],
  "commentary": "US CPI rose 0.24% in March 2026..."   // AI analysis
}

Example call

GET https://globalapi.dev/us/cpi — $0.005 USDC via x402

How to call this endpoint via x402

Send a standard HTTP GET request to /us/cpi
Receive a 402 Payment Required response with a payment-required header containing base64-encoded payment instructions
Submit payment via the Coinbase CDP facilitator using the x402 client library
Retry the request with the signed payment-signature header
Receive a 200 OK response with the data payload

Compatible client libraries: @x402/client (TypeScript), x402-python (Python).