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x402 Protocol Service Directory

US CPI Data & Inflation Report API

Finance PAYMENT-READY

payment-ready until 2026-08-20

Gives you official United States inflation numbers from the government's BLS Consumer Price Index. Ask for the newest reading, a specific month in the past, or a whole range of months, and get back clear percentages for overall inflation and 'core' inflation (which ignores food and energy prices), plus a plain-English summary sentence.

Pay from $0.01 per request in USDC on Base / Solana, settled onchain via the x402 protocol, no signup, no API key needed.

first settlement 2026-05-05 · $11.30 all-time · settled via coinbase, payAI

BASE URL https://cpi-report-us.underscoredone.com WEBSITE https://underscoredone.com/cpi_report_us/ ENDPOINTS 1 NETWORK Base / Solana ASSET USDC MEMBER SINCE 2026-07-15 MONITORED SINCE 2026-07-15

ASSESSMENT

updated 4h ago

Evidence-backed signals, not a single score. Click any chip for the proof. Measured values stay read-only; unknown is honest.

reliability 100%
uptime 24h
100%
uptime 7d
100%
uptime 30d
100%
uptime 90d
100%
response p95
1495ms
avg response
904ms
total checks
2,617

Measured on the unpaid 402 handshake, not the paid call. A service can 402 correctly and still fail after payment.

compliance A (14/14)

14 of 14 x402 conformance checks pass. Full checklist below.

jump to compliance checklist

price $0.01 (p45 in Finance)
price (min)
$0.01
category percentile (min)
p45 in Finance
endpoints / prices
1 / 1
model
flat
stability
100%
risk clean

No deterministic risk flag. Risk fires only on an exact blocklist match, or a reserved-brand name with a mismatched verified payTo. Never from low uptime, a high price, or a model guess.

domain age
80d
registrar
Cloudflare, Inc.
hosting
custom
domain created
2026-05-24

Identity facts, not a risk score.

traction $10.4966666667 30d · 27 buyers
volume 30d
$10.4966666667
buyers 30d
27
settlements 30d
137
first settlement
2026-05-05
last settlement
2026-08-13
top buyer share
65% of 30d volume
trend 7d vs 30d
0.04x the 30d daily rate
networks
eip155:8453, solana:5eykt4UsFv8P8NJdTREpY1vzqKqZKvdpKuc147dw2N9d
volume all-time
$11.30
settlements all-time
369
median settlement 30d
$0.01
max settlement 30d
$10.00
settled via
coinbase ($31.40, 128 tx), payAI ($0.09, 9 tx)

Attributed pro-quota: this payout address is shared, so volume is the operator-level figure divided by the services sharing it, while buyer and transaction counts stay whole. A declared convention, not an individually observed measure, and still a conservative undercount.

Currently sharing this payout address with Bulk DMARC Record Lookup, Curl HTTP Request.

Top buyer share is a concentration signal, not part of the ranking score.

WHAT IT DOES

ai-derived

Provides US CPI inflation data from the BLS Consumer Price Index

category
finance
in
query params
financeinflationcpieconomic-data

AI-generated summary. The measured data is never altered by it.

ENDPOINTS

Service endpoints with HTTP method, path, description, pricing, and network
METHOD PATH DESCRIPTION PRICE NETWORK ASSET 402 CHANNEL
GET /cpi $0.01 Base/Solana USDC header
1 endpoints

REQUEST / RESPONSE EXAMPLE

An unpaid request to GET /cpi returns HTTP 402 with the payment terms. Settle onchain via your facilitator, then retry with the X-Payment header.

// request
curl -i 'https://cpi-report-us.underscoredone.com/cpi'
// 402 response (captured by monitor) · 1 payload · click to expand
[
  {
    "error": "Payment required",
    "accepts": [
      {
        "asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
        "extra": {
          "name": "USD Coin",
          "version": "2"
        },
        "payTo": "0xE9740820225B3918b4ddd1292C7cA4Ca0e2C2F08",
        "amount": "10000",
        "scheme": "exact",
        "network": "eip155:8453",
        "maxTimeoutSeconds": 300
      },
      {
        "asset": "EPjFWdd5AufqSSqeM2qN1xzybapC8G4wEGGkZwyTDt1v",
        "extra": {
          "feePayer": "D6ZhtNQ5nT9ZnTHUbqXZsTx5MH2rPFiBBggX4hY1WePM"
        },
        "payTo": "8ugAWAXDB8V18kiUrGZTq1oMvU3C6Fxs8hfC6rvzQT3b",
        "amount": "10000",
        "scheme": "exact",
        "network": "solana:5eykt4UsFv8P8NJdTREpY1vzqKqZKvdp",
        "maxTimeoutSeconds": 300
      }
    ],
    "resource": {
      "url": "https://cpi-report-us.underscoredone.com/cpi",
      "tags": [
        "Dates"
      ],
      "mimeType": "application/json",
      "description": "Gives you official United States inflation numbers from the government's BLS Consumer Price Index. Ask for the newest reading, a specific month in the past, or a whole range of months, and get back clear percentages for overall inflation and 'core' inflation (which ignores food and energy prices), plus a plain-English summary sentence.",
      "serviceName": "US CPI Data & Inflation Report"
    },
    "extensions": {
      "bazaar": {
        "info": {
          "input": {
            "body": {
              "period": "2024-03"
            },
            "type": "http",
            "method": "POST",
            "bodyType": "json"
          },
          "output": {
            "type": "json",
            "example": {
              "api_version": "1.0.0"
            }
          }
        },
        "schema": {
          "type": "object",
          "$schema": "https://json-schema.org/draft/2020-12/schema",
          "required": [
            "input"
          ],
          "properties": {
            "input": {
              "type": "object",
              "required": [
                "type",
                "method",
                "bodyType",
                "body"
              ],
              "properties": {
                "body": {
                  "type": "object",
                  "required": [],
                  "properties": {
                    "end": {
                      "type": "string",
                      "description": "The last month of a historical range, written as year-month, like 2024-12. Leave out to end at the newest available month."
                    },
                    "start": {
                      "type": "string",
                      "description": "The first month of a historical range, written as year-month, like 2023-01. Leave out to start from the earliest available month."
                    },
                    "period": {
                      "type": "string",
                      "description": "A single month to look up, written as year-month, like 2024-03. Leave this out if you want the newest data or a range instead."
                    }
                  },
                  "additionalProperties": false
                },
                "type": {
                  "type": "string",
                  "const": "http"
                },
                "method": {
                  "enum": [
                    "POST",
                    "PUT",
                    "PATCH"
                  ],
                  "type": "string"
                },
                "bodyType": {
                  "enum": [
                    "json",
                    "form-data",
                    "text"
                  ],
                  "type": "string"
                }
              },
              "additionalProperties": false
            },
            "output": {
              "type": "object",
              "required": [
                "type"
              ],
              "properties": {
                "type": {
                  "type": "string"
                },
                "example": {
                  "type": "object",
                  "required": [
                    "api_version"
                  ],
                  "properties": {
                    "api_version": {
                      "type": "string"
                    }
                  }
                }
              }
            }
          }
        }
      }
    },
    "x402Version": 2
  }
]

OVER TIME

All charts use the 30d selector; each series spans only the dates it has data for. Every series is also served as JSON at /api/v1/services/us-cpi-data-inflation-report-api/price, /scores, /volume and /buyers. On-chain volume and distinct buyers are measured over the service's settlement address and are a conservative undercount (only settlements that reach a measured facilitator are counted). The on-chain series roll up hourly, so the latest day can be up to about an hour behind; distinct buyers are counted per payout address, so a service that settles to more than one address is an upper bound.

UPTIME
07-15 · uptime 100.0% · 1056ms avg07-16 · uptime 100.0% · 1146ms avg07-17 · uptime 100.0% · 1037ms avg07-18 · uptime 100.0% · 543ms avg07-19 · uptime 100.0% · 530ms avg07-20 · uptime 100.0% · 564ms avg07-21 · uptime 100.0% · 846ms avg07-22 · uptime 100.0% · 701ms avg07-23 · uptime 100.0% · 715ms avg07-24 · uptime 100.0% · 765ms avg07-25 · uptime 100.0% · 776ms avg07-26 · uptime 100.0% · 983ms avg07-27 · uptime 100.0% · 960ms avg07-28 · uptime 100.0% · 966ms avg07-29 · uptime 100.0% · 902ms avg07-30 · uptime 100.0% · 936ms avg07-31 · uptime 100.0% · 1199ms avg08-01 · uptime 100.0% · 1156ms avg08-02 · uptime 100.0% · 1285ms avg08-03 · uptime 100.0% · 1200ms avg08-04 · uptime 100.0% · 1148ms avg08-05 · uptime 100.0% · 1511ms avg08-06 · uptime 100.0% · 844ms avg08-07 · uptime 100.0% · 860ms avg08-08 · uptime 100.0% · 898ms avg08-09 · uptime 100.0% · 665ms avg08-10 · uptime 100.0% · 607ms avg08-11 · uptime 100.0% · 685ms avg08-12 · uptime 100.0% · 844ms avg08-13 · uptime 100.0% · 828ms avg07-1508-13
30d UPTIME 100%
RESPONSE TIME
07-15 · 1056ms avg07-15 · 1056ms avg07-16 · 1146ms avg07-16 · 1146ms avg07-17 · 1037ms avg07-17 · 1037ms avg07-18 · 543ms avg07-18 · 543ms avg07-19 · 530ms avg07-19 · 530ms avg07-20 · 564ms avg07-20 · 564ms avg07-21 · 846ms avg07-21 · 846ms avg07-22 · 701ms avg07-22 · 701ms avg07-23 · 715ms avg07-23 · 715ms avg07-24 · 765ms avg07-24 · 765ms avg07-25 · 776ms avg07-25 · 776ms avg07-26 · 983ms avg07-26 · 983ms avg07-27 · 960ms avg07-27 · 960ms avg07-28 · 966ms avg07-28 · 966ms avg07-29 · 902ms avg07-29 · 902ms avg07-30 · 936ms avg07-30 · 936ms avg07-31 · 1199ms avg07-31 · 1199ms avg08-01 · 1156ms avg08-01 · 1156ms avg08-02 · 1285ms avg08-02 · 1285ms avg08-03 · 1200ms avg08-03 · 1200ms avg08-04 · 1148ms avg08-04 · 1148ms avg08-05 · 1511ms avg08-05 · 1511ms avg08-06 · 844ms avg08-06 · 844ms avg08-07 · 860ms avg08-07 · 860ms avg08-08 · 898ms avg08-08 · 898ms avg08-09 · 665ms avg08-09 · 665ms avg08-10 · 607ms avg08-10 · 607ms avg08-11 · 685ms avg08-11 · 685ms avg08-12 · 844ms avg08-12 · 844ms avg08-13 · 828ms avg08-13 · 828ms avg07-1508-13
AVG RESP 904ms
PRICE (captured 402, USD)
07-15 · $0.0108-13 · $0.01$0.0107-1508-13
SUB-SCORES (uptime + x402 compliance)
07-15 uptime: 100.0% compliance: 92% checks07-16 uptime: 100.0% compliance: 92% checks07-17 uptime: 100.0% compliance: 100% checks07-18 uptime: 100.0% compliance: 100% checks07-19 uptime: 100.0% compliance: 100% checks07-20 uptime: 100.0% compliance: 100% checks07-21 uptime: 100.0% compliance: 100% checks07-22 uptime: 100.0% compliance: 100% checks07-23 uptime: 100.0% compliance: 100% checks07-24 uptime: 100.0% compliance: 100% checks07-25 uptime: 100.0% compliance: 100% checks07-26 uptime: 100.0% compliance: 100% checks07-27 uptime: 100.0% compliance: 100% checks07-28 uptime: 100.0% compliance: 100% checks07-29 uptime: 100.0% compliance: 100% checks07-30 uptime: 100.0% compliance: 100% checks07-31 uptime: 100.0% compliance: 100% checks08-01 uptime: 100.0% compliance: 100% checks08-02 uptime: 100.0% compliance: 100% checks08-03 uptime: 100.0% compliance: 100% checks08-04 uptime: 100.0% compliance: 100% checks08-05 uptime: 100.0% compliance: 100% checks08-06 uptime: 100.0% compliance: 100% checks08-07 uptime: 100.0% compliance: 100% checks08-08 uptime: 100.0% compliance: 100% checks08-09 uptime: 100.0% compliance: 100% checks08-10 uptime: 100.0% compliance: 100% checks08-11 uptime: 100.0% compliance: 100% checks08-12 uptime: 100.0% compliance: 100% checks08-13 uptime: 100.0% compliance: 100% checksuptimecompliance07-1508-13

checklist grew 11->14 on 2026-07-28; a step here is a metric change, not a regression

PILLARS OVER TIME (measured)

Measured site and economics pillars from the assessment history, so the latest value shown elsewhere on this page reads as a point on a trend rather than a permanent state.

VOLUME (on-chain settlement, USD)
07-15 · $0.2407-16 · $0.0307-17 · $0.0407-18 · $0.0307-19 · $0.0107-20 · $0.0707-21 · $0.1007-22 · $0.0207-23 · $0.1307-26 · $0.0107-27 · $0.0507-28 · $2007-29 · $1008-01 · $0.0408-02 · $0.0108-04 · $0.0808-07 · $0.0108-10 · $0.1008-12 · $0.1408-13 · $0.04peak $2007-1508-13

Shared payout address (2 other services). These bars are the full shared address (operator-level), so do not sum them across the services that share it. Where a per-service figure is attributed, the assessment block and the ranking, it is the address total divided pro-quota by the 3 services sharing it: a declared convention, not an individually observed measure.

DISTINCT BUYERS
07-15 · 9 buyers07-16 · 1 buyer07-17 · 2 buyers07-18 · 2 buyers07-19 · 1 buyer07-20 · 3 buyers07-21 · 2 buyers07-22 · 1 buyer07-23 · 4 buyers07-26 · 1 buyer07-27 · 2 buyers07-28 · 2 buyers07-29 · 1 buyer08-01 · 1 buyer08-02 · 1 buyer08-04 · 1 buyer08-07 · 1 buyer08-10 · 2 buyers08-12 · 3 buyers08-13 · 1 buyerpeak 9 buyers07-1508-13

Shared payout address (2 other services). These bars are the full shared address (operator-level), so do not sum them across the services that share it. Per-service buyer and transaction counts are shown whole (integers), not divided; only volume is attributed pro-quota. A declared convention, not an individually observed measure.

COMPLIANCE

14/14 checks pass · grade A

last 402 captured 2026-07-15 · last up 2026-08-13

  • 402 payload captured
  • accepts[] array present
  • payTo address recoverable
  • payTo at accepts[0].payTo (conformant shape)
  • payTo is a valid on-chain address
  • atomic price declared
  • atomic price in a sane range
  • asset (token) address declared
  • network resolves to CAIP-2
  • payment scheme declared
  • served over HTTPS
  • declares the current x402 version (2)
  • EIP-712 domain parameters present on every EVM entry
  • x402 v2 envelope delivered in the payment-required header

SITE PILLARS

  • homepage reachable
  • openapi doc
  • pricing page
  • llms.txt
  • robots.txt
  • terms page
recent checks (18) live · click to expand
TIME STATUS RESP CAUSE
● OK 710ms
● OK 594ms
● OK 614ms
● OK 557ms
● OK 1014ms
● OK 686ms
● OK 462ms
● OK 822ms
● OK 716ms
● OK 656ms
● OK 902ms
● OK 907ms
● OK 681ms
● OK 983ms
● OK 1199ms
● OK 1135ms
● OK 1254ms
● OK 1012ms

EMBED THIS BADGE

Show that US CPI Data & Inflation Report API is monitored on x402-list. Paste this on your site or README, it links back to this live listing.

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status
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