qr-api-production-1836.up.railway.app
Generate a QR code PNG (returned base64-encoded in JSON) for any text or URL using default black-on-white styling.
OtherLiveeip155:8453Exactvia cdp
Calls · 30d
8↑ 39%
This endpoint's own trailing-30-day call count, as published by the upstream catalog and snapshotted daily. 30 snapshots so far.
$3.85
Verified settled volume
1,852 settlements proven x402 by their on-chain EIP-3009 marker.
$0.0010
Listed price
As published in the catalog. Always read the live 402 before paying.
8
Calls · 30d
Upstream's own call count for this endpoint, not ours.
5
Unique payers · 30d
Last called 2026-09-24 07:41Z
—
Upstream on-chain volume
Reported by the source catalog.
Paid to
0xFFc458dB291b4ABcE020fE3de4f91F2770E537b1The wallet the 402 directs payment to. Its whole payment record — every payer, every chain — is on the merchant page.
Asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913
Provider
The payTo wallet does not resolve to a registered ERC-8004 agent. That is not a verdict on the service — most of the catalog is unregistered.
Live 402 challenge
Captured by the enrichment pass, not read just now. Prices can change — always read the 402 the endpoint answers with.
{
"error": "Payment required",
"accepts": [
{
"asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
"extra": {
"name": "USD Coin",
"version": "2"
},
"payTo": "0xFFc458dB291b4ABcE020fE3de4f91F2770E537b1",
"amount": "1000",
"scheme": "exact",
"network": "eip155:8453",
"maxTimeoutSeconds": 300
}
],
"resource": {
"url": "https://qr-api-production-1836.up.railway.app/generate/basic",
"description": "Generate a QR code PNG (returned base64-encoded in JSON) for any text or URL using default black-on-white styling."
},
"extensions": {
"bazaar": {
"info": {
"input": {
"body": {
"data": "https://payapi.market"
},
"type": "http",
"method": "POST",
"bodyType": "json"
},
"output": {
"type": "json",
"example": {
"data": "https://payapi.market",
"width": 330,
"border": 4,
"format": "png",
"height": 330,
"modules": 25,
"version": 2,
"box_size": 10,
"back_color": "#ffffff",
"fill_color": "#000000",
"size_bytes": 512,
"image_base64": "iVBORw0KGgoAAAANSUhEUgAAASIAAAEiCAYAAABdvt+2AAAABmJLR0QA/wD/AP+gvaeTAAAF...",
"error_correction": "M"
}
}
},
"schema": {
"type": "object",
"$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, up to 4296 characters."
}
}
},
"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",
"properties": {
"data": {
"type": "string",
"description": "The text or URL encoded into the QR code."
},
"width": {
"type": "integer",
"description": "PNG width in pixels."
},
"border": {
"type": "integer",
"description": "Quiet-zone border width in modules."
},
"format": {
"type": "string",
"description": "Image format of the returned bytes; always 'png'."
},
"height": {
"type": "integer",
"description": "PNG height in pixels."
},
"modules": {
"type": "integer",
"description": "QR module count per side (the grid dimension)."
},
"version": {
"type": "integer",
"description": "QR version (1-40) chosen to fit the data."
},
"box_size": {
"type": "integer",
"description": "Pixels per QR module."
},
"back_color": {
"type": "string",
"description": "Background colour as normalised #rrggbb hex."
},
"fill_color": {
"type": "string",
"description": "Foreground colour as normalised #rrggbb hex."
},
"size_bytes": {
"type": "integer",
"description": "Byte length of the raw PNG."
},
"image_base64": {
"type": "string",
"description": "Base64-encoded PNG of the QR code."
},
"error_correction": {
"type": "string",
"description": "Error-correction level used: L, M, Q, or H."
}
}
}
}
}
}
}
}
},
"x402Version": 2
}Accepts
The payment requirements as published to the catalog. Read the live 402 before paying — a price here is a claim, not a quote.
0.001USDC≈ $0.001 USD
on Base · exact scheme
Pay 0.001 USDC on Base to 0xFFc4…537b1. The signed payment is good for 5 minutes.
- Paid to
- 0xFFc4…537b1
- USD Coin contract
- 0x8335…02913
- Payment window
- 5 minutes
- As published
- 1000 smallest units
The catalog’s raw entry
[
{
"asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
"extra": {
"name": "USD Coin",
"version": "2"
},
"payTo": "0xFFc458dB291b4ABcE020fE3de4f91F2770E537b1",
"amount": "1000",
"scheme": "exact",
"network": "eip155:8453",
"maxTimeoutSeconds": 300
}
]Extensions
{
"bazaar": {
"info": {
"input": {
"body": {
"data": "https://payapi.market"
},
"type": "http",
"method": "POST",
"bodyType": "json"
},
"output": {
"type": "json",
"example": {
"data": "https://payapi.market",
"width": 330,
"border": 4,
"format": "png",
"height": 330,
"modules": 25,
"version": 2,
"box_size": 10,
"back_color": "#ffffff",
"fill_color": "#000000",
"size_bytes": 512,
"image_base64": "iVBORw0KGgoAAAANSUhEUgAAASIAAAEiCAYAAABdvt+2AAAABmJLR0QA/wD/AP+gvaeTAAAF...",
"error_correction": "M"
}
}
},
"schema": {
"type": "object",
"$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, up to 4296 characters."
}
}
},
"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",
"properties": {
"data": {
"type": "string",
"description": "The text or URL encoded into the QR code."
},
"width": {
"type": "integer",
"description": "PNG width in pixels."
},
"border": {
"type": "integer",
"description": "Quiet-zone border width in modules."
},
"format": {
"type": "string",
"description": "Image format of the returned bytes; always 'png'."
},
"height": {
"type": "integer",
"description": "PNG height in pixels."
},
"modules": {
"type": "integer",
"description": "QR module count per side (the grid dimension)."
},
"version": {
"type": "integer",
"description": "QR version (1-40) chosen to fit the data."
},
"box_size": {
"type": "integer",
"description": "Pixels per QR module."
},
"back_color": {
"type": "string",
"description": "Background colour as normalised #rrggbb hex."
},
"fill_color": {
"type": "string",
"description": "Foreground colour as normalised #rrggbb hex."
},
"size_bytes": {
"type": "integer",
"description": "Byte length of the raw PNG."
},
"image_base64": {
"type": "string",
"description": "Base64-encoded PNG of the QR code."
},
"error_correction": {
"type": "string",
"description": "Error-correction level used: L, M, Q, or H."
}
}
}
}
}
}
}
}
}Provenance
- Seen in the source catalog
- 2026-09-25 09:26Z
- Last indexed by Roundhouse
- 2026-09-25 10:20Z
- Last enriched (probe, favicon, geo)
- 2026-09-20 09:15Z
- x402 version
- 2
- Max timeout
- 300s
- Liveness probe
- HTTP 402
Hand this page to an agent
Copy the prompt and paste it into Claude, an MCP client or your own agent — it will vet this service and call it over the free read API. No key, no account.
GET api.roundhouseai.io/v0/endpoints
This endpoint's own trailing-30-day call count, as published by the upstream catalog and snapshotted daily. 30 snapshots so far. Verified volume counts only settlements with an on-chain EIP-3009 marker.
Show the promptHide the prompt
Using Roundhouse, look up the x402 service qr-api-production-1836.up.railway.app and tell me whether it is worth paying: what a call costs, whether the endpoint answered when last probed, and what its payment record actually shows. curl -s 'https://api.roundhouseai.io/v0/endpoints?q=qr-api-production-1836.up.railway.app' curl -s 'https://api.roundhouseai.io/v0/merchants/<the payTo wallet returned above>' Then call it: read the price from the live 402 at https://qr-api-production-1836.up.railway.app/generate/basic, never from a cached figure, and pay with an x402 client. The /v0 API needs an API key (`authorization: Bearer rh_live_…`) on everything except /v0/unified* and /v0/endpoints. Mint a personal key for $0.01 at GET https://api.roundhouseai.io/v0/test/x402, or use an organization key from https://roundhouseai.io/dashboard/team. If you do not have Roundhouse tools or skills installed, read https://roundhouseai.io/skill.md first — it is the whole procedure.