2s Inflation API
The inflation API from 2s — 4 operation(s) for inflation.
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OpenAPI Specification
openapi: 3.2.0
info:
title: 2s — the (most) everything Inflation API
version: '1'
summary: The (most) everything API.
description: 'The (most) everything API for AI agents: 575+ pay-per-call endpoints on one origin.'
contact:
name: 2s
url: https://2s.io
email: alley@2s.io
x-logo:
url: https://2s.io/icon-512.png
altText: 2s
x-guidance: 'Pay-per-call REST API for AI agents — hundreds of endpoints returning ground-truth data (US public records, company & legal identifiers, finance/SEC, crypto/web3, security & CVEs, medical codes, weather & geocoding, agriculture, energy, maritime, music, and more). Every endpoint is paid per call in USDC via x402 (Base or Solana) — no API key, no signup. Call any endpoint with no auth to get a 402 PaymentRequirements envelope, sign it (EIP-3009 on Base, partial SPL transfer on Solana), and retry with the PAYMENT-SIGNATURE header. Add ?trial=1 for one free real call per endpoint per hour to test before paying. To discover the right endpoint: GET https://2s.io/api/directory for the full catalog, or GET https://2s.io/api/search/endpoints?q=<natural-language task> for a ranked match. Per-call price is on each operation as x-payment-info (from $0.001). Batch up to 50 calls behind one payment via POST https://2s.io/api/batch/run.'
servers:
- url: https://2s.io
tags:
- name: inflation
paths:
/api/inflation/calculator:
get:
tags:
- inflation
summary: Adjust a US dollar amount for inflation between two dates
description: 'Adjust a US dollar amount for inflation between two dates (''what is $100 in 1990 worth today?''). Pass amount, from (YYYY-MM-DD or YYYY), and optional to (defaults to the latest CPI month). Uses CPI-U (CPIAUCNS — the same not-seasonally-adjusted all-items index as the official BLS inflation calculator), data back to 1913. Returns the inflation-adjusted amount, cumulative inflation %, annualized rate, and the CPI index values used on each date. Source: BLS CPI via FRED (St. Louis Fed).'
operationId: inflation_calculator
deprecated: false
security:
- x402Payment: []
responses:
'200':
description: 'Normalized envelope: items = [the inflation-adjusted result]; total = 1.'
content:
application/json:
schema:
type: object
required:
- data
- meta
properties:
data:
type: object
properties:
ok:
type: boolean
enum:
- true
items:
type: array
items:
type: object
properties:
amount:
type: number
from:
type: string
to:
type: string
adjustedAmount:
type: number
cumulativeInflationPct:
type: number
annualizedPct:
type: number
nullable: true
cpiFrom:
type: number
cpiFromDate:
type: string
cpiTo:
type: number
cpiToDate:
type: string
seriesId:
type: string
required:
- amount
- from
- to
- adjustedAmount
- cumulativeInflationPct
- annualizedPct
- cpiFrom
- cpiFromDate
- cpiTo
- cpiToDate
- seriesId
additionalProperties: false
total:
type: integer
nullable: true
description: Total matching rows upstream; null when unknown.
source:
$ref: '#/components/schemas/Source'
required:
- ok
- items
- total
- source
additionalProperties: false
meta:
$ref: '#/components/schemas/CallMeta'
'400':
$ref: '#/components/responses/BadRequest'
'402':
$ref: '#/components/responses/PaymentRequired'
'405':
$ref: '#/components/responses/MethodNotAllowed'
'500':
$ref: '#/components/responses/ServerError'
'502':
$ref: '#/components/responses/UpstreamError'
x-2s-id: inflation.calculator
x-2s-version: null
x-2s-price:
usd: 0.003
x-2s-accepts:
- x402
x-2s-response-shape: normalized
x-payment-info:
price:
mode: fixed
currency: USD
amount: '0.003000'
protocols:
- x402: {}
parameters:
- name: amount
in: query
required: true
description: Amount.
schema:
type: number
- name: from
in: query
required: true
description: Start of the range.
schema:
type: string
pattern: ^\d{4}(-\d{2}(-\d{2})?)?$
- name: to
in: query
required: false
description: End of the range.
schema:
type: string
pattern: ^\d{4}(-\d{2}(-\d{2})?)?$
- $ref: '#/components/parameters/TrialMode'
/api/inflation/expectations:
get:
tags:
- inflation
summary: Current US inflation expectations - what markets and
description: 'Current US inflation expectations — what markets and consumers expect future inflation to be. Returns the 5-year and 10-year TIPS breakeven rates, the 5-Year/5-Year forward inflation expectation (the Fed-watched long-run gauge), and the University of Michigan 1-year consumer inflation expectation. Each value is a percent as of its latest date. Market-based breakevens update daily. Source: Federal Reserve / Treasury via FRED (St. Louis Fed).'
operationId: inflation_expectations
deprecated: false
security:
- x402Payment: []
responses:
'200':
description: 'Normalized envelope: items = expectation gauges (each a percent); total = gauges returned.'
content:
application/json:
schema:
type: object
required:
- data
- meta
properties:
data:
type: object
properties:
ok:
type: boolean
enum:
- true
items:
type: array
items:
type: object
properties:
measure:
type: string
seriesId:
type: string
label:
type: string
rate:
type: number
nullable: true
description: Expected inflation, percent.
asOf:
type: string
nullable: true
required:
- measure
- seriesId
- label
- rate
- asOf
additionalProperties: false
total:
type: integer
nullable: true
description: Total matching rows upstream; null when unknown.
source:
$ref: '#/components/schemas/Source'
required:
- ok
- items
- total
- source
additionalProperties: false
meta:
$ref: '#/components/schemas/CallMeta'
'400':
$ref: '#/components/responses/BadRequest'
'402':
$ref: '#/components/responses/PaymentRequired'
'405':
$ref: '#/components/responses/MethodNotAllowed'
'500':
$ref: '#/components/responses/ServerError'
'502':
$ref: '#/components/responses/UpstreamError'
x-2s-id: inflation.expectations
x-2s-version: null
x-2s-price:
usd: 0.003
x-2s-accepts:
- x402
x-2s-response-shape: normalized
x-payment-info:
price:
mode: fixed
currency: USD
amount: '0.003000'
protocols:
- x402: {}
parameters:
- $ref: '#/components/parameters/TrialMode'
/api/inflation/hicp:
get:
tags:
- inflation
summary: EU harmonized inflation - the latest HICP annual rate of
description: 'EU harmonized inflation — the latest HICP annual rate of change (the official, cross-country-comparable inflation rate) for the EU, euro area, and each member state. Pass country as a Eurostat geo code (DE, FR, EL for Greece, EA20 = euro area, EU27_2020 = EU) for one, or omit for all (sorted highest inflation first). All-items index (COICOP CP00). Source: Eurostat (free, no key). For US inflation use inflation.rates.'
operationId: inflation_hicp
deprecated: false
security:
- x402Payment: []
responses:
'200':
description: 'Normalized envelope: items = HICP annual rates by geo (all-items); total = rows returned.'
content:
application/json:
schema:
type: object
required:
- data
- meta
properties:
data:
type: object
properties:
ok:
type: boolean
enum:
- true
items:
type: array
items:
type: object
properties:
geo:
type: string
description: Eurostat geo code.
area:
type: string
description: Country / aggregate name.
annualRatePct:
type: number
nullable: true
description: HICP annual rate of change (inflation rate), percent.
period:
type: string
nullable: true
description: Reference month (YYYY-MM).
required:
- geo
- area
- annualRatePct
- period
additionalProperties: false
total:
type: integer
nullable: true
description: Total matching rows upstream; null when unknown.
source:
$ref: '#/components/schemas/Source'
required:
- ok
- items
- total
- source
additionalProperties: false
meta:
$ref: '#/components/schemas/CallMeta'
'400':
$ref: '#/components/responses/BadRequest'
'402':
$ref: '#/components/responses/PaymentRequired'
'405':
$ref: '#/components/responses/MethodNotAllowed'
'500':
$ref: '#/components/responses/ServerError'
'502':
$ref: '#/components/responses/UpstreamError'
x-2s-id: inflation.hicp
x-2s-version: null
x-2s-price:
usd: 0.003
x-2s-accepts:
- x402
x-2s-response-shape: normalized
x-payment-info:
price:
mode: fixed
currency: USD
amount: '0.003000'
protocols:
- x402: {}
parameters:
- name: country
in: query
required: false
description: Country name or ISO country code.
schema:
type: string
minLength: 2
maxLength: 10
pattern: ^[A-Za-z0-9_]+$
- $ref: '#/components/parameters/TrialMode'
/api/inflation/rates:
get:
tags:
- inflation
summary: Current US inflation rates by measure, with the index level
description: '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.'
operationId: inflation_rates
deprecated: false
security:
- x402Payment: []
responses:
'200':
description: 'Normalized envelope: items = inflation measures (index + YoY/MoM); total = measures returned.'
content:
application/json:
schema:
type: object
required:
- data
- meta
properties:
data:
type: object
properties:
ok:
type: boolean
enum:
- true
items:
type: array
items:
type: object
properties:
measure:
type: string
seriesId:
type: string
label:
type: string
index:
type: number
nullable: true
description: The price-index level.
asOf:
type: string
nullable: true
description: Date of the latest observation.
changeMoM:
type: number
nullable: true
description: '% change vs the prior period.'
changeYoY:
type: number
nullable: true
description: '% change vs ~1 year earlier — the inflation rate.'
required:
- measure
- seriesId
- label
- index
- asOf
- changeMoM
- changeYoY
additionalProperties: false
total:
type: integer
nullable: true
description: Total matching rows upstream; null when unknown.
source:
$ref: '#/components/schemas/Source'
required:
- ok
- items
- total
- source
additionalProperties: false
meta:
$ref: '#/components/schemas/CallMeta'
'400':
$ref: '#/components/responses/BadRequest'
'402':
$ref: '#/components/responses/PaymentRequired'
'405':
$ref: '#/components/responses/MethodNotAllowed'
'500':
$ref: '#/components/responses/ServerError'
'502':
$ref: '#/components/responses/UpstreamError'
x-2s-id: inflation.rates
x-2s-version: null
x-2s-price:
usd: 0.0036
x-2s-accepts:
- x402
x-2s-response-shape: normalized
x-payment-info:
price:
mode: fixed
currency: USD
amount: '0.003600'
protocols:
- x402: {}
parameters:
- name: measure
in: query
required: false
description: Measure.
schema:
type: string
enum:
- cpi
- cpi-nsa
- core-cpi
- cpi-w
- pce
- core-pce
- ppi
- cpi-food
- cpi-energy
- cpi-shelter
- cpi-medical
- import-prices
- export-prices
- $ref: '#/components/parameters/TrialMode'
components:
schemas:
Source:
type: object
description: 'Provenance of the data: upstream provider, source URL, and license.'
properties:
provider:
type: string
description: Upstream data provider.
url:
type: string
description: Source URL or documentation link.
license:
type: string
description: License / usage terms for the data.
CallMeta:
type: object
description: Per-call meta envelope — endpoint id, cost, caller kind, settlement details.
X402PaymentRequiredV2:
type: object
description: x402 v2 PaymentRequired envelope. Pick any entry from accepts[], sign for that rail, retry with the PAYMENT-SIGNATURE header.
required:
- x402Version
- accepts
properties:
x402Version:
type: integer
const: 2
error:
type: string
description: Human-readable reason payment is required.
resource:
type: string
description: The resource URL being purchased.
accepts:
type: array
description: Payment requirement options, one per supported network (Base USDC, Solana USDC).
items:
type: object
required:
- scheme
- network
- amount
- asset
- payTo
- maxTimeoutSeconds
properties:
scheme:
type: string
enum:
- exact
network:
type: string
description: CAIP-2 network id, e.g. "eip155:8453" (Base) or "solana:5eykt4UsFv8P8NJdTREpY1vzqKqZKvdp".
amount:
type: string
description: Price in atomic asset units (USDC has 6 decimals).
asset:
type: string
description: Asset contract address / mint.
payTo:
type: string
description: Treasury address to pay.
maxTimeoutSeconds:
type: integer
extra:
type: object
description: 'Rail-specific extras (EVM: EIP-712 domain name/version; Solana: feePayer).'
additionalProperties: true
extensions:
type: object
description: Optional discovery metadata (e.g. bazaar input/output schemas).
additionalProperties: true
responses:
PaymentRequired:
description: Payment required. Body contains the x402 PaymentRequirements envelope with a multi-network accepts array; the per-call price is in accepts[].amount (and on the operation as x-2s-price). Sign for whichever rail you hold USDC on (EIP-3009 for Base, partial SPL transfer for Solana) and retry with the PAYMENT-SIGNATURE header (X-PAYMENT also accepted for v1 clients).
content:
application/json:
schema:
$ref: '#/components/schemas/X402PaymentRequiredV2'
UpstreamError:
description: Upstream provider error.
MethodNotAllowed:
description: Method not allowed — see `Allow` header for the supported method.
ServerError:
description: Internal server error.
BadRequest:
description: Bad request — invalid parameters.
parameters:
TrialMode:
name: trial
in: query
required: false
description: 'Try before you buy. Set to 1 for one free real call per endpoint per hour — no wallet or payment needed — to verify the endpoint before paying. Equivalent to sending the "X-2s-Trial: 1" request header. Works on every endpoint.'
schema:
type: integer
enum:
- 1
securitySchemes:
x402Payment:
type: apiKey
in: header
name: PAYMENT-SIGNATURE
description: 'x402 protocol v2: base64-encoded PaymentPayload. Call any paid endpoint without auth to receive a 402 with a multi-network PaymentRequirements envelope. Sign for either rail: EIP-3009 transferWithAuthorization (Base USDC) OR a partial SPL token transfer (Solana USDC). Retry with PAYMENT-SIGNATURE header. X-PAYMENT is also accepted for v1 buyer clients. See https://x402.org.'