Current US inflation rates by measure, with the index level plus computed year-over-year and month-over-month % change. Pass measure for one, or omit for all. Measures: cpi, cpi-nsa, core-cpi, cpi-w, pce, core-pce, ppi, cpi-food, cpi-energy, cpi-shelter, cpi-medical, import-prices, export-prices — i.e. headline CPI (SA + NSA), core CPI, CPI-W, PCE, core PCE (the Fed's 2% target gauge), PPI final demand, and CPI by category (food, energy, shelter, medical) + import/export prices. The YoY change is the headline "inflation rate". Each result names the FRED series ID used. Source: BLS/BEA via FRED (St. Louis Fed). For raw access to any other series use bls.series; this is the curated, rate-computed layer.
/api/inflation/ratesPAYMENT-SIGNATURE.The rates API is a pay-per-call inflation endpoint built for AI agents and autonomous software. Current US inflation rates by measure, with the index level plus computed year-over-year and month-over-month % change.
There is no signup and no API key. An agent (or any HTTP client) hits the endpoint, receives an x402 "402 Payment Required" challenge, signs a sub-cent USDC payment on Base or Solana, and retries — the data comes back on the paid request. That makes it a drop-in rates data source for an agent tool-use loop, an MCP host, or a backend that needs inflation data on demand without onboarding to yet another vendor portal.
| Name | Type | Description |
|---|---|---|
measure | string | one of: cpi | cpi-nsa | core-cpi | cpi-w | pce | core-pce | ppi | cpi-food | cpi-energy | cpi-shelter | cpi-medical | import-prices | export-prices |
# 1. Probe with no auth → 402 envelope with PaymentRequirements curl -sS 'https://2s.io/api/inflation/rates?measure=cpi' # 2. Sign + retry with PAYMENT-SIGNATURE: curl -sS 'https://2s.io/api/inflation/rates?measure=cpi' \ -H 'PAYMENT-SIGNATURE: <base64-json-payload>' # Or use the canonical runner (handles probe → sign → retry): # EVM_PRIVATE_KEY=0x... node --env-file=.env.local \ # --experimental-strip-types scripts/x402-pay.ts \ # 'https://2s.io/api/inflation/rates?measure=cpi'
import { TwoS } from '@2sio/sdk'
const client = new TwoS({
privateKey: process.env.EVM_PRIVATE_KEY as `0x${string}`,
})
const result = await client.inflation.rates({
"measure": "cpi"
})
console.log('endpoint:', result.endpoint)
console.log('cost:', result.costUsd, 'USDC')
console.log('tx:', result.settlement?.txHash)
console.log('data:', result.data)import os
from twosio import TwoS
client = TwoS(private_key=os.environ["EVM_PRIVATE_KEY"])
result = client.inflation.rates(measure="cpi")
print("endpoint:", result.endpoint)
print("cost:", result.cost_usd, "USDC")
print("tx:", (result.settlement or {}).get("tx_hash"))
print("data:", result.data)// 1. Add @2sio/mcp to your MCP host config (Claude Desktop example below).
// EVM_PRIVATE_KEY funds x402 payments per call.
// claude_desktop_config.json
{
"mcpServers": {
"2sio": {
"command": "npx",
"args": ["-y", "@2sio/mcp"],
"env": { "EVM_PRIVATE_KEY": "0x..." }
}
}
}
// 2. Once the server is running, agents call this tool via standard MCP:
{
"jsonrpc": "2.0",
"id": 1,
"method": "tools/call",
"params": {
"name": "inflation.rates",
"arguments": {
"measure": "cpi"
}
}
}| Field | Type | Description |
|---|---|---|
ok | boolean | one of: true |
items | array | |
total | integer | Total matching rows upstream; null when unknown. |
source | object |
{
"ok": true,
"items": [
{
"measure": "example",
"seriesId": "example",
"label": "example",
"index": 1,
"asOf": "example",
"changeMoM": 1,
"changeYoY": 1
}
],
"total": 1,
"source": {
"provider": "example",
"url": "example",
"license": "example"
}
}