2s.

GET https://2s.io/api/inflation/calculator ↗

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).

Eligibility: probeable
Failures: 0
Last quote: 2026-08-12 22:00:01 UTC
Last probe: 2026-08-12 22:00:01 UTC

Payment requirements / accepts[] 2 options

State	Network	Scheme	Atomic amount	Asset	payTo / untrusted
active	eip155:8453	exact	3000	0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913	0x2b6D4988Db4723E6908Db86Ab2b8dFBc51FC32C5
active	solana:5eykt4usfv8p8njdtrepy1vzqkqzkvdp	exact	3000	EPjFWdd5AufqSSqeM2qN1xzybapC8G4wEGGkZwyTDt1v	TW6ntaGzvj63ZgPjszd4FCGmVTGfzv1MAYZbjYcyWhn

All advertised payment options are stored. Base (`eip155:8453`) is the operational network for ranking and canaries; non-Base options remain visible for transparency.

Probe evidence 1 recent

healthy 2026-08-12 22:00:01 UTC GET · HTTP 402 · 40ms · accepts 2 · base 1 ok

Request: GET https://2s.io/api/inflation/calculator
Robots: allow
Note: http_402;accepts=2;base=1
Accepts fingerprint: 190722a2cb3be7e44fe8f0ee8f79089dc79c418253d6ac243e4e0f4c8e9311f5

Accepts snapshot

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    "assetTransferMethod": null,
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      "version": "2"
    },
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    "network": "eip155:8453",
    "payTo": "0x2b6D4988Db4723E6908Db86Ab2b8dFBc51FC32C5",
    "paymentFlow": null,
    "raw": {
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      "asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
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        "version": "2"
      },
      "maxTimeoutSeconds": 60,
      "max_timeout_seconds": 60,
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      "payTo": "0x2b6D4988Db4723E6908Db86Ab2b8dFBc51FC32C5",
      "pay_to": "0x2b6D4988Db4723E6908Db86Ab2b8dFBc51FC32C5",
      "scheme": "exact"
    },
    "scheme": "exact"
  },
  {
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    "assetTransferMethod": null,
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      "name": "USDC",
      "version": "1"
    },
    "maxTimeoutSeconds": 60,
    "network": "solana:5eykt4usfv8p8njdtrepy1vzqkqzkvdp",
    "payTo": "TW6ntaGzvj63ZgPjszd4FCGmVTGfzv1MAYZbjYcyWhn",
    "paymentFlow": null,
    "raw": {
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        "version": "1"
      },
      "maxTimeoutSeconds": 60,
      "max_timeout_seconds": 60,
      "network": "solana:5eykt4UsFv8P8NJdTREpY1vzqKqZKvdp",
      "payTo": "TW6ntaGzvj63ZgPjszd4FCGmVTGfzv1MAYZbjYcyWhn",
      "pay_to": "TW6ntaGzvj63ZgPjszd4FCGmVTGfzv1MAYZbjYcyWhn",
      "scheme": "exact"
    },
    "scheme": "exact"
  }
]

PaymentRequired raw

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  "accepts": [
    {
      "amount": "3000",
      "asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
      "extra": {
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        "version": "2"
      },
      "maxTimeoutSeconds": 60,
      "network": "eip155:8453",
      "payTo": "0x2b6D4988Db4723E6908Db86Ab2b8dFBc51FC32C5",
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    },
    {
      "amount": "3000",
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        "name": "USDC",
        "version": "1"
      },
      "maxTimeoutSeconds": 60,
      "network": "solana:5eykt4UsFv8P8NJdTREpY1vzqKqZKvdp",
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      "scheme": "exact"
    }
  ],
  "error": "PAYMENT-SIGNATURE required",
  "extensions": {
    "bazaar": {
      "info": {
        "input": {
          "method": "GET",
          "queryParams": {
            "amount": 100,
            "from": "1990-01-01"
          },
          "type": "http"
        }
      },
      "schema": {
        "$schema": "https://json-schema.org/draft/2020-12/schema",
        "properties": {
          "input": {
            "properties": {
              "method": {
                "const": "GET"
              },
              "queryParams": {
                "properties": {
                  "amount": {
                    "description": "Dollar amount to adjust.",
                    "type": "number"
                  },
                  "from": {
                    "description": "Start date (YYYY-MM-DD or YYYY).",
                    "type": "string"
                  },
                  "to": {
                    "description": "End date (YYYY-MM-DD or YYYY). Defaults to latest CPI.",
                    "type": "string"
                  }
                },
                "required": [
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                ]
              },
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              }
            },
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        },
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  },
  "resource": {
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    "iconUrl": "https://2s.io/icon-512.png",
    "mimeType": "application/json",
    "serviceName": "2s",
    "tags": [
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      "identifiers",
      "ai-agents",
      "us-gov-data",
      "x402",
      "upto-billing",
      "ai-gateway",
      "agent-infrastructure"
    ],
    "url": "https://2s.io/api/inflation/calculator"
  },
  "x402Version": 2
}

Response headers

{
  "access-control-allow-headers": "Authorization, Content-Type",
  "access-control-allow-methods": "GET, POST, OPTIONS",
  "access-control-allow-origin": "*",
  "access-control-max-age": "86400",
  "age": "0",
  "cache-control": "public, max-age=0, must-revalidate",
  "content-security-policy": "default-src 'none'; style-src 'self' 'unsafe-inline'; img-src 'self' data:; font-src 'self'; connect-src 'self'; frame-ancestors 'none'; base-uri 'none'",
  "content-type": "application/json",
  "date": "Wed, 12 Aug 2026 22:00:01 GMT",
  "payment-required": "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",
  "permissions-policy": "geolocation=(), camera=(), microphone=()",
  "referrer-policy": "no-referrer",
  "server": "Vercel",
  "strict-transport-security": "max-age=63072000; includeSubDomains; preload",
  "transfer-encoding": "chunked",
  "x-content-type-options": "nosniff",
  "x-frame-options": "DENY",
  "x-matched-path": "/api/inflation/calculator",
  "x-payment-requirements": "x402",
  "x-vercel-cache": "MISS",
  "x-vercel-id": "iad1::iad1::df7hp-1786572001696-f50ed06c992d"
}

Response body

{
  "accepts": [
    {
      "amount": "3000",
      "asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
      "extra": {
        "name": "USD Coin",
        "version": "2"
      },
      "maxTimeoutSeconds": 60,
      "network": "eip155:8453",
      "payTo": "0x2b6D4988Db4723E6908Db86Ab2b8dFBc51FC32C5",
      "scheme": "exact"
    },
    {
      "amount": "3000",
      "asset": "EPjFWdd5AufqSSqeM2qN1xzybapC8G4wEGGkZwyTDt1v",
      "extra": {
        "feePayer": "Hc3sdEAsCGQcpgfivywog9uwtk8gUBUZgsxdME1EJy88",
        "name": "USDC",
        "version": "1"
      },
      "maxTimeoutSeconds": 60,
      "network": "solana:5eykt4UsFv8P8NJdTREpY1vzqKqZKvdp",
      "payTo": "TW6ntaGzvj63ZgPjszd4FCGmVTGfzv1MAYZbjYcyWhn",
      "scheme": "exact"
    }
  ],
  "error": "PAYMENT-SIGNATURE required",
  "extensions": {
    "bazaar": {
      "info": {
        "input": {
          "method": "GET",
          "queryParams": {
            "amount": 100,
            "from": "1990-01-01"
          },
          "type": "http"
        },
        "output": {
          "example": {
            "items": [
              {
                "adjustedAmount": 255.3,
                "amount": 100,
                "annualizedPct": 2.64,
                "cpiFrom": 127.4,
                "cpiFromDate": "1990-01-01",
                "cpiTo": 325.252,
                "cpiToDate": "2026-01-01",
                "cumulativeInflationPct": 155.3,
                "from": "1990-01-01",
                "seriesId": "CPIAUCNS",
                "to": "2026-01-01"
              }
            ],
            "ok": true,
            "source": {
              "license": "FRED® data; many series are public domain (US govt). Attribution to FRED required for redistribution.",
              "provider": "Federal Reserve Bank of St. Louis — FRED",
              "url": "https://fred.stlouisfed.org/"
            },
            "total": 1
          },
          "schema": {
            "properties": {
              "items": {
                "items": {
                  "properties": {
                    "adjustedAmount": {
                      "type": "number"
                    },
                    "amount": {
                      "type": "integer"
                    },
                    "annualizedPct": {
                      "type": "number"
                    },
                    "cpiFrom": {
                      "type": "number"
                    },
                    "cpiFromDate": {
                      "type": "string"
                    },
                    "cpiTo": {
                      "type": "number"
                    },
                    "cpiToDate": {
                      "type": "string"
                    },
                    "cumulativeInflationPct": {
                      "type": "number"
                    },
                    "from": {
                      "type": "string"
                    },
                    "seriesId": {
                      "type": "string"
                    },
                    "to": {
                      "type": "string"
                    }
                  },
                  "type": "object"
                },
                "type": "array"
              },
              "ok": {
                "type": "boolean"
              },
              "source": {
                "properties": {
                  "license": {
                    "type": "string"
                  },
                  "provider": {
                    "type": "string"
                  },
                  "url": {
                    "type": "string"
                  }
                },
                "type": "object"
              },
              "total": {
                "type": "integer"
              }
            },
            "type": "object"
          },
          "type": "json"
        }
      },
      "schema": {
        "$schema": "https://json-schema.org/draft/2020-12/schema",
        "properties": {
          "input": {
            "properties": {
              "method": {
                "const": "GET"
              },
              "queryParams": {
                "properties": {
                  "amount": {
                    "description": "Dollar amount to adjust.",
                    "type": "number"
                  },
                  "from": {
                    "description": "Start date (YYYY-MM-DD or YYYY).",
                    "type": "string"
                  },
                  "to": {
                    "description": "End date (YYYY-MM-DD or YYYY). Defaults to latest CPI.",
                    "type": "string"
                  }
                },
                "required": [
                  "amount",
                  "from"
                ]
              },
              "type": {
                "const": "http"
              }
            },
            "required": [
              "type",
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              "queryParams"
            ],
            "type": "object"
          },
          "output": {
            "properties": {
              "items": {
                "items": {
                  "properties": {
                    "adjustedAmount": {
                      "type": "number"
                    },
                    "amount": {
                      "type": "integer"
                    },
                    "annualizedPct": {
                      "type": "number"
                    },
                    "cpiFrom": {
                      "type": "number"
                    },
                    "cpiFromDate": {
                      "type": "string"
                    },
                    "cpiTo": {
                      "type": "number"
                    },
                    "cpiToDate": {
                      "type": "string"
                    },
                    "cumulativeInflationPct": {
                      "type": "number"
                    },
                    "from": {
                      "type": "string"
                    },
                    "seriesId": {
                      "type": "string"
                    },
                    "to": {
                      "type": "string"
                    }
                  },
                  "type": "object"
                },
                "type": "array"
              },
              "ok": {
                "type": "boolean"
              },
              "source": {
                "properties": {
                  "license": {
                    "type": "string"
                  },
                  "provider": {
                    "type": "string"
                  },
                  "url": {
                    "type": "string"
                  }
                },
                "type": "object"
              },
              "total": {
                "type": "integer"
              }
            },
            "type": "object"
          }
        },
        "required": [
          "input"
        ],
        "type": "object"
      }
    }
  },
  "resource": {
    "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).",
    "iconUrl": "https://2s.io/icon-512.png",
    "mimeType": "application/json",
    "serviceName": "2s",
    "tags": [
      "public-records",
      "identifiers",
      "ai-agents",
      "us-gov-data",
      "x402",
      "upto-billing",
      "ai-gateway",
      "agent-infrastructure"
    ],
    "url": "https://2s.io/api/inflation/calculator"
  },
  "x402Version": 2
}

Request headers

{
  "accept": "*/*",
  "user-agent": "Fetch402Bot/0.1 (+https://fetch402.com/crawler; contact: crawler@fetch402.com)"
}

Machine contract

Schemas.

InputJSON

{
  "method": "GET",
  "queryParams": {
    "amount": 100,
    "from": "1990-01-01"
  },
  "type": "http"
}

OutputJSON

{}

Latest evidenceProbe

healthy

No probe evidence recorded yet.

Run / 2026-08-12 22:00:01 UTC · ok

Provenance 2 sources

cdp_bazaar

GET https://2s.io/api/inflation/calculator

Seen / 2026-08-13 00:00:34 UTC

quote_probe

GET https://2s.io/api/inflation/calculator

Seen / 2026-08-12 22:00:01 UTC

Untrusted payment target

Fetch402 records advertised payTo values, but does not treat them as verified merchant identity until paid-delivery validation lands.