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x402 Protocol Service Directory

US CPI Data & Inflation Report API

Finance PAYMENT-READY

payment-ready until 2026-09-05

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.

measured since 2026-05-05 (start of our harvest window) · $15.87 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

VERDICT

ranking generation 3

solid 81/100 #44 of 77 in Finance by measured score

What the score read on this service: status online, 100% uptime 30d, 3100ms response p95, x402 compliance 14 of 14, $0.01 price against the category, on-chain traction measured. Each of those is measured, and each is published in full below.

The score comes from our own monitoring, never from reviews, operator claims, or a language model: reliability, x402 compliance, price against the category, a deterministic risk flag, and a small on-chain traction term, weighted by ranking generation 3. It is not placement anyone can buy: the paid verify tier is reported beside it and is not one of its inputs. Every component below stays published and read-only.

It is a score inside Finance, and only there: price and speed are scored against the whole category field, every listing in it that carries no danger flag, the scored service included, which here means 77 listings, this one among them. That set is wider than the 77 the position above is counted against, because a listing we have measured too little of to rank still sits in the field the price and the speed are normalized over. The same service in a different field would read differently. The same engine answers GET /api/v1/best, and asked for a different pool (the whole directory, or another filter) it returns a different number for this service under this same ranking generation. Neither is more correct: they answer different questions, and the methodology states which is which.

Bands on the 0 to 100 measured score: strong at 93 and above, solid from 75, mixed from 55, weak below 55. Price and speed are scored against the whole category field, every listing in it that carries no danger flag, the scored service included, so the score places a service in its own field.

ALTERNATIVES IN FINANCE

Other Finance services in this directory, ordered by the same measured score. The figures are ours: 30-day uptime from our own probes, 30-day settlement volume read on-chain (a conservative undercount, and null where we cannot measure it, never a zero).

Ranked alternative x402 services in the same category, with band, measured score, 30-day uptime and 30-day on-chain settlement volume
SERVICE BAND SCORE UPTIME 30D VOL 30D
Losbeto — Cross-Asset Market Intelligence strong 98 98.6% ---
Bitrefill strong 97 100% $865.88
GBLIN Protocol strong 96 100% ---
Trading Strategy Data strong 95 100% ---
Trend Signals strong 94 100% ---
5 of 76 other ranked services in Finance · see the whole category

ASSESSMENT

updated 2h ago

The parts the verdict above is computed from, each with its proof. Click any chip. Measured values stay read-only; unknown is honest, and an unknown is never counted as a zero.

reliability 100%
uptime 24h
100%
uptime 7d
100%
uptime 30d
100%
uptime 90d
100%
response p95
3100ms
avg response
870ms
total checks
2,751

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
95d
registrar
Cloudflare, Inc.
hosting
custom
domain created
2026-05-24

Identity facts, not a risk score.

traction $4.7166666667 30d · 25 buyers
volume 30d
$4.7166666667
buyers 30d
25
settlements 30d
103
measured since
2026-05-05 (start of our harvest window)
last settlement
2026-08-29
top buyer share
42% of 30d volume
trend 7d vs 30d
1.63x the 30d daily rate
networks
eip155:8453, solana:5eykt4UsFv8P8NJdTREpY1vzqKqZKvdpKuc147dw2N9d
volume all-time
$15.87
settlements all-time
431
median settlement 30d
$0.01
max settlement 30d
$5.00
settled via
coinbase ($14.07, 95 tx), payAI ($0.08, 8 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
07-31 · 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% · 797ms avg08-14 · uptime 100.0% · 786ms avg08-15 · uptime 100.0% · 846ms avg08-16 · uptime 100.0% · 792ms avg08-17 · uptime 100.0% · 693ms avg08-18 · uptime 100.0% · 543ms avg08-19 · uptime 100.0% · 686ms avg08-20 · uptime 100.0% · 798ms avg08-21 · uptime 100.0% · 580ms avg08-22 · uptime 100.0% · 335ms avg08-23 · uptime 100.0% · 582ms avg08-24 · uptime 100.0% · 755ms avg08-25 · uptime 100.0% · 1019ms avg08-26 · uptime 100.0% · 952ms avg08-27 · uptime 100.0% · 750ms avg08-28 · uptime 100.0% · 673ms avg08-29 · uptime 100.0% · 1766ms avg07-3108-29
30d UPTIME 100%
RESPONSE TIME
07-31 · 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 · 797ms avg08-13 · 797ms avg08-14 · 786ms avg08-14 · 786ms avg08-15 · 846ms avg08-15 · 846ms avg08-16 · 792ms avg08-16 · 792ms avg08-17 · 693ms avg08-17 · 693ms avg08-18 · 543ms avg08-18 · 543ms avg08-19 · 686ms avg08-19 · 686ms avg08-20 · 798ms avg08-20 · 798ms avg08-21 · 580ms avg08-21 · 580ms avg08-22 · 335ms avg08-22 · 335ms avg08-23 · 582ms avg08-23 · 582ms avg08-24 · 755ms avg08-24 · 755ms avg08-25 · 1019ms avg08-25 · 1019ms avg08-26 · 952ms avg08-26 · 952ms avg08-27 · 750ms avg08-27 · 750ms avg08-28 · 673ms avg08-28 · 673ms avg08-29 · 1766ms avg08-29 · 1766ms avg07-3108-29
AVG RESP 871ms
PRICE (captured 402, USD)
07-30 · $0.0108-29 · $0.01$0.0107-3008-29
SUB-SCORES (uptime + x402 compliance)
07-30 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% checks08-14 uptime: 100.0% compliance: 100% checks08-15 uptime: 100.0% compliance: 100% checks08-16 uptime: 100.0% compliance: 100% checks08-17 uptime: 100.0% compliance: 100% checks08-18 uptime: 100.0% compliance: 100% checks08-19 uptime: 100.0% compliance: 100% checks08-20 uptime: 100.0% compliance: 100% checks08-21 uptime: 100.0% compliance: 100% checks08-22 uptime: 100.0% compliance: 100% checks08-23 uptime: 100.0% compliance: 100% checks08-24 uptime: 100.0% compliance: 100% checks08-25 uptime: 100.0% compliance: 100% checks08-26 uptime: 100.0% compliance: 100% checks08-27 uptime: 100.0% compliance: 100% checks08-28 uptime: 100.0% compliance: 100% checks08-29 uptime: 100.0% compliance: 100% checksuptimecompliance07-3008-29

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)
08-01 · $0.0408-02 · $0.0108-04 · $0.0808-07 · $0.0108-10 · $0.1008-12 · $0.1408-13 · $0.0608-14 · $0.0508-15 · $0.0308-17 · $0.1808-18 · $0.0308-19 · $0.0108-21 · $108-22 · $708-23 · $0.0608-24 · $508-26 · $0.0108-27 · $0.0208-28 · $0.0308-29 · $0.01peak $708-0108-29

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
08-01 · 1 buyer08-02 · 1 buyer08-04 · 1 buyer08-07 · 1 buyer08-10 · 2 buyers08-12 · 3 buyers08-13 · 1 buyer08-14 · 1 buyer08-15 · 1 buyer08-17 · 1 buyer08-18 · 2 buyers08-19 · 1 buyer08-21 · 2 buyers08-22 · 2 buyers08-23 · 2 buyers08-24 · 4 buyers08-26 · 1 buyer08-27 · 2 buyers08-28 · 3 buyers08-29 · 1 buyerpeak 4 buyers08-0108-29

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 2026-08-29

  • 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 1022ms
● OK 770ms
● OK 876ms
● OK 702ms
● SLOW 1414ms
● OK 1063ms
● SLOW 2527ms
● SLOW 1946ms
● OK 631ms
● OK 1066ms
● OK 636ms
● SLOW 1371ms
● SLOW 8673ms
● SLOW 4917ms
● SLOW 3436ms
● SLOW 4800ms
● SLOW 3100ms
● OK 1306ms

EMBED THIS BADGE

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Keep this listing accurate: propose changes to the name, description, website, category or add new endpoints to monitor. Ownership is verified with a domain proof and every change is reviewed manually; measured data stays read-only.

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