WDH.sh — QR Codes
OtherQR code generation for agents, paid per call in USDC on Base via x402.
Pay from $0.001 per request in USDC on Base, settled onchain via the x402 protocol, no signup, no API key needed.
ASSESSMENT
updated 4h agoEvidence-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
- 1641ms
- avg response
- 947ms
- total checks
- 2,692
compliance A (11/11)
11 of 11 x402 conformance checks pass. Full checklist below.
price $0.001 (p22 in Other)
- price (min)
- $0.001
- category percentile (min)
- p22 in Other
- 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.
traction $0.15 30d · 12 buyers
- volume 30d
- $0.15
- buyers 30d
- 12
- settlements 30d
- 53
- last settlement
- 2026-07-21
- top buyer share
- 40% of 30d volume
- trend 7d vs 30d
- 1.06x the 30d daily rate
- networks
- eip155:8453
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-derivedGenerates QR codes
- category
- qr-code
- in
- query params
- out
- image
- auth
- none
AI-generated summary. The measured data is never altered by it.
ENDPOINTS
| METHOD | PATH | DESCRIPTION | PRICE | NETWORK | ASSET |
|---|---|---|---|---|---|
| GET | /qr | $0.001 | Base | USDC |
REQUEST / RESPONSE EXAMPLE
An unpaid request to GET /qr returns HTTP 402 with the payment terms. Settle onchain via your facilitator, then retry with the X-Payment header.
curl -i 'https://qr.wdh.sh/qr'
// 402 response (captured by monitor) · 1 payload · click to expand
[
{
"error": "payment_required",
"accepts": [
{
"asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
"extra": {
"name": "USD Coin",
"version": "2",
"description": "QR code generation."
},
"payTo": "0x04b563909fdAFEACE9cba26f1848141bd140D741",
"amount": "1000",
"scheme": "exact",
"network": "eip155:8453",
"maxTimeoutSeconds": 300
}
],
"resource": {
"url": "https://qr.wdh.sh/qr",
"tags": [
"qr-codes",
"images",
"generator"
],
"iconUrl": "https://qr.wdh.sh/favicon.ico",
"description": "Generate a QR code as a PNG or SVG: POST the text or URL to encode (with an optional size from 64 to 2048px) and get back the image. Useful for any \"scan to view\" moment — signage, business cards, slides — or to encode a public wallet address for x402 funding and top-ups.",
"serviceName": "QR Hero"
},
"extensions": {
"bazaar": {
"info": {
"input": {
"body": {
"data": "https://example.com",
"size": 512,
"format": "png"
},
"type": "http",
"method": "POST",
"bodyType": "json"
},
"output": {
"type": "json",
"example": {
"note": "Response body is the raw QR image bytes (PNG) or SVG markup.",
"contentType": "image/png"
}
}
},
"schema": {
"type": "object",
"$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": [
"data"
],
"properties": {
"data": {
"type": "string",
"description": "Text or URL to encode in the QR code."
},
"size": {
"type": "integer",
"maximum": 2048,
"minimum": 64,
"description": "Image edge length in pixels (clamped to 64-2048)."
},
"format": {
"enum": [
"png",
"svg"
],
"type": "string",
"description": "Output image format."
}
}
},
"type": {
"type": "string",
"const": "http"
},
"method": {
"enum": [
"POST"
],
"type": "string"
},
"bodyType": {
"enum": [
"json",
"form-data",
"text"
],
"type": "string"
}
},
"additionalProperties": false
},
"output": {
"type": "object",
"required": [
"type"
],
"properties": {
"type": {
"type": "string"
},
"example": {
"type": "object"
}
}
}
}
}
}
},
"x402Version": 2
}
] UPTIME
RECENT CHECKS
OVER TIME
All charts share the 7d window selected here. Every series is also served as JSON at /api/v1/services/wdh-sh-qr-codes/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).
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
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