x402 List

x402 Protocol Service Directory

●

Mart402

Data

Web & document extraction APIs for AI agents: URL-to-Markdown extraction, PDF parsing with hallucination-guarded OCR (dual-engine consensus + calibrated confidence + per-segment corroboration, Japanese-strong), invoice field verification, schema-driven structured extraction, and JP company profiles. Pay per call via x402 (USDC on Base), no account or API key. Free identical sandbox on Base Sepolia at mart402.dev. Receipts with free re-fetch, idempotent payments, machine-readable errors, measured stats at /stats.

Pay from $0.001 to $0.02 per request in USDC on Base, settled onchain via the x402 protocol, no signup, no API key needed.

listed 2026-07-25 · no on-chain settlement recorded yet

BASE URL https://mart402.com │ WEBSITE https://mart402.com │ ENDPOINTS 5 │ NETWORK Base │ ASSET USDC │ MEMBER SINCE 2026-07-25 │ MONITORED SINCE 2026-07-25

ASSESSMENT

updated 2h 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
-
uptime 7d
-
uptime 30d
-
uptime 90d
-
response p95
77ms
avg response
77ms
total checks
1
compliance A (11/11)

11 of 11 x402 conformance checks pass. Full checklist below.

jump to compliance checklist

price $0.001 to $0.02 (p14 in Data)
price (min)
$0.001
price (max)
$0.02
category percentile (min)
p14 in Data
category percentile (max)
p47 in Data
endpoints / prices
5 / 4
model
tiered
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
5d
registrar
Cloudflare, Inc.
hosting
custom
domain created
2026-07-19

Identity facts, not a risk score.

traction $0 30d · 0 buyers
volume 30d
$0
buyers 30d
0
settlements 30d
0
first settlement
---
last settlement
---
top buyer share
-
trend 7d vs 30d
-
networks
eip155:8453
volume all-time
$0
settlements all-time
0
median settlement 30d
$0
max settlement 30d
$0
settled via
-

Conservative undercount: only USDC settlements via facilitators we measure are counted. A measured floor, not an estimate.

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

WHAT IT DOES

ai-derived

Mart402 provides APIs for data extraction, parsing, verification, and structured data retrieval from various sources including web pages, PDFs, and Japanese company profiles.

category
data-extraction
in
query params
auth
none
data-extractionpdf-parsingverificationstructured-dataweb-scrapingocrjp-company

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
GET /v1/extract mart402 extract $0.002 Base USDC
GET /v1/jp-company mart402 jp-company $0.02 Base USDC
GET /v1/parse mart402 parse (per page, quote first) $0.004 Base USDC
GET /v1/structured mart402 structured $0.02 Base USDC
GET /v1/verify mart402 verify $0.001 Base USDC
5 endpoints

REQUEST / RESPONSE EXAMPLE

An unpaid request to GET /v1/extract returns HTTP 402 with the payment terms. Settle onchain via your facilitator, then retry with the X-Payment header.

// request
curl -i 'https://mart402.com/v1/extract'
// 402 response (captured by monitor) · 5 payloads · click to expand 
[
  {
    "error": "Payment required",
    "accepts": [
      {
        "asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
        "extra": {
          "name": "USD Coin",
          "version": "2"
        },
        "payTo": "0xE3244a21D0d68bFa78b7CAd8C3b8777aDFbB3188",
        "scheme": "exact",
        "network": "base",
        "mimeType": "application/json",
        "resource": "https://mart402.com/v1/extract",
        "description": "mart402 extract",
        "maxAmountRequired": "2000",
        "maxTimeoutSeconds": 120
      }
    ],
    "x402Version": 1
  },
  {
    "error": "Payment required",
    "accepts": [
      {
        "asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
        "extra": {
          "name": "USD Coin",
          "version": "2"
        },
        "payTo": "0xE3244a21D0d68bFa78b7CAd8C3b8777aDFbB3188",
        "scheme": "exact",
        "network": "base",
        "mimeType": "application/json",
        "resource": "https://mart402.com/v1/parse",
        "description": "mart402 parse (per page, quote first)",
        "maxAmountRequired": "4000",
        "maxTimeoutSeconds": 120
      }
    ],
    "x402Version": 1
  },
  {
    "error": "Payment required",
    "accepts": [
      {
        "asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
        "extra": {
          "name": "USD Coin",
          "version": "2"
        },
        "payTo": "0xE3244a21D0d68bFa78b7CAd8C3b8777aDFbB3188",
        "scheme": "exact",
        "network": "base",
        "mimeType": "application/json",
        "resource": "https://mart402.com/v1/verify",
        "description": "mart402 verify",
        "maxAmountRequired": "1000",
        "maxTimeoutSeconds": 120
      }
    ],
    "x402Version": 1
  },
  {
    "error": "Payment required",
    "accepts": [
      {
        "asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
        "extra": {
          "name": "USD Coin",
          "version": "2"
        },
        "payTo": "0xE3244a21D0d68bFa78b7CAd8C3b8777aDFbB3188",
        "scheme": "exact",
        "network": "base",
        "mimeType": "application/json",
        "resource": "https://mart402.com/v1/structured",
        "description": "mart402 structured",
        "maxAmountRequired": "20000",
        "maxTimeoutSeconds": 120
      }
    ],
    "x402Version": 1
  },
  {
    "error": "Payment required",
    "accepts": [
      {
        "asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
        "extra": {
          "name": "USD Coin",
          "version": "2"
        },
        "payTo": "0xE3244a21D0d68bFa78b7CAd8C3b8777aDFbB3188",
        "scheme": "exact",
        "network": "base",
        "mimeType": "application/json",
        "resource": "https://mart402.com/v1/jp-company",
        "description": "mart402 jp-company",
        "maxAmountRequired": "20000",
        "maxTimeoutSeconds": 120
      }
    ],
    "x402Version": 1
  }
]

OVER TIME

All charts share the 30d window selected here. Every series is also served as JSON at /api/v1/services/mart402/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
07-25 · uptime 100.0% · 55ms avg07-2507-25
30d UPTIME 100%
RESPONSE TIME
07-25 · 55ms avg07-25 · 55ms avg07-2507-25
AVG RESP 63ms
PRICE (captured 402, USD)
building price history ($0.004)

Median across 5 endpoints. Use the selector to isolate one.

SUB-SCORES (uptime + x402 compliance)
building assessment history (1 day so far)
VOLUME (on-chain settlement, USD)
no on-chain volume yet
DISTINCT BUYERS
building buyer history (1 day so far)

COMPLIANCE

11/11 checks pass · grade A
  • 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

SITE PILLARS

  • homepage reachable
  • openapi doc
  • pricing page
  • llms.txt
  • robots.txt
  • terms page
recent checks (8) · click to expand
TIME STATUS RESP
● OK 22ms
● SLOW 156ms
● OK 30ms
● OK 46ms
● SLOW 112ms
● OK 21ms
● OK 41ms
● OK 77ms
8 of 8 checks

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Mart402 listed on x402-list
status
Mart402 uptime on x402-list
live uptime
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RUN THIS SERVICE?

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.

[ update this listing ]