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.'