Color Convert + Contrast
Keyronne: things I
InfraLiveeip155:8453Exactvia cdp
ColorHexRgbWcagContrast
Calls · 30d
5↑ 21%
This endpoint's own trailing-30-day call count, as published by the upstream catalog and snapshotted daily. 30 snapshots so far.
$2.52
Verified settled volume
915 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.
5
Calls · 30d
Upstream's own call count for this endpoint, not ours.
4
Unique payers · 30d
Last called 2026-09-17 03:48Z
—
Upstream on-chain volume
Reported by the source catalog.
Paid to
0xB86F95EF5FA904318Ea9Df3b59AdCe099b478fC4The 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-SIGNATURE header is required",
"accepts": [
{
"asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
"extra": {
"name": "USD Coin",
"version": "2"
},
"payTo": "0xB86F95EF5FA904318Ea9Df3b59AdCe099b478fC4",
"amount": "1000",
"scheme": "exact",
"network": "eip155:8453",
"maxTimeoutSeconds": 60
}
],
"resource": {
"url": "https://keyronne.com/api/color",
"tags": [
"color",
"hex",
"rgb",
"wcag",
"contrast"
],
"mimeType": "application/json",
"description": "Parse any CSS color (hex, rgb(), hsl()) and emit all three formats plus relative luminance. Compute WCAG contrast ratios against a background with AA/AAA pass-fail for normal and large text, and lighten, darken, or mix colors. Built for agents generating accessible UI themes. POST a JSON body like: {\"color\":\"#3498db\",\"background\":\"#ffffff\"}",
"serviceName": "Color Convert + Contrast"
},
"extensions": {
"bazaar": {
"info": {
"input": {
"body": {
"color": "#3498db",
"background": "#ffffff"
},
"type": "http",
"method": "POST",
"bodyType": "json"
},
"output": {
"type": "json",
"example": {
"hex": "#3498db",
"hsl": {
"h": 204,
"l": 53.1,
"s": 70
},
"rgb": {
"a": 1,
"b": 219,
"g": 152,
"r": 52
},
"input": "#3498db",
"contrast": {
"ratio": 2.59,
"against": "#ffffff",
"largeTextAA": false,
"normalTextAA": false
},
"luminance": 0.2831
}
}
},
"schema": {
"type": "object",
"$schema": "https://json-schema.org/draft/2020-12/schema",
"required": [
"input"
],
"properties": {
"input": {
"type": "object",
"properties": {
"body": {
"type": "object",
"required": [
"color"
],
"properties": {
"mix": {
"type": "string",
"description": "Blend the color toward this one."
},
"color": {
"type": "string",
"description": "A color: \"#3498db\", \"rgb(52,152,219)\", or \"hsl(204,70%,53%)\"."
},
"darken": {
"type": "number",
"description": "Decrease lightness by this many percent (0-100)."
},
"weight": {
"type": "number",
"default": 0.5,
"maximum": 1,
"minimum": 0,
"description": "Mix weight toward \"mix\"."
},
"lighten": {
"type": "number",
"description": "Increase lightness by this many percent (0-100)."
},
"background": {
"type": "string",
"description": "Optional second color for a WCAG contrast check."
}
}
},
"type": {
"type": "string",
"const": "http"
},
"method": {
"enum": [
"POST"
],
"type": "string"
},
"bodyType": {
"enum": [
"json"
],
"type": "string"
}
}
},
"output": {
"type": "object",
"properties": {
"hex": {
"type": "string"
},
"hsl": {
"type": "object"
},
"rgb": {
"type": "object"
},
"mixed": {
"type": "string",
"description": "Present when \"mix\" is given."
},
"adjusted": {
"type": "string",
"description": "Present when lighten/darken is given."
},
"contrast": {
"type": "object",
"description": "Present when \"background\" is given."
},
"luminance": {
"type": "number"
}
}
}
}
}
}
},
"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≈ $0.001 USD
on Base · exact scheme
Pay 0.001 USDC on Base to 0xB86F…78fC4. The signed payment is good for 1 minute.
- Paid to
- 0xB86F…78fC4
- USD Coin contract
- 0x8335…02913
- Payment window
- 1 minute
- As published
- 1000 smallest units
The catalog’s raw entry
[
{
"asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
"extra": {
"name": "USD Coin",
"version": "2"
},
"payTo": "0xB86F95EF5FA904318Ea9Df3b59AdCe099b478fC4",
"amount": "1000",
"scheme": "exact",
"network": "eip155:8453",
"maxTimeoutSeconds": 60
}
]Extensions
{
"bazaar": {
"info": {
"input": {
"body": {
"color": "#3498db",
"background": "#ffffff"
},
"type": "http",
"method": "POST",
"bodyType": "json"
},
"output": {
"type": "json",
"example": {
"hex": "#3498db",
"hsl": {
"h": 204,
"l": 53.1,
"s": 70
},
"rgb": {
"a": 1,
"b": 219,
"g": 152,
"r": 52
},
"input": "#3498db",
"contrast": {
"ratio": 2.59,
"against": "#ffffff",
"largeTextAA": false,
"normalTextAA": false
},
"luminance": 0.2831
}
}
},
"schema": {
"type": "object",
"$schema": "https://json-schema.org/draft/2020-12/schema",
"required": [
"input"
],
"properties": {
"input": {
"type": "object",
"properties": {
"body": {
"type": "object",
"required": [
"color"
],
"properties": {
"mix": {
"type": "string",
"description": "Blend the color toward this one."
},
"color": {
"type": "string",
"description": "A color: \"#3498db\", \"rgb(52,152,219)\", or \"hsl(204,70%,53%)\"."
},
"darken": {
"type": "number",
"description": "Decrease lightness by this many percent (0-100)."
},
"weight": {
"type": "number",
"default": 0.5,
"maximum": 1,
"minimum": 0,
"description": "Mix weight toward \"mix\"."
},
"lighten": {
"type": "number",
"description": "Increase lightness by this many percent (0-100)."
},
"background": {
"type": "string",
"description": "Optional second color for a WCAG contrast check."
}
}
},
"type": {
"type": "string",
"const": "http"
},
"method": {
"enum": [
"POST"
],
"type": "string"
},
"bodyType": {
"enum": [
"json"
],
"type": "string"
}
}
},
"output": {
"type": "object",
"properties": {
"hex": {
"type": "string"
},
"hsl": {
"type": "object"
},
"rgb": {
"type": "object"
},
"mixed": {
"type": "string",
"description": "Present when \"mix\" is given."
},
"adjusted": {
"type": "string",
"description": "Present when lighten/darken is given."
},
"contrast": {
"type": "object",
"description": "Present when \"background\" is given."
},
"luminance": {
"type": "number"
}
}
}
}
}
}
}Provenance
- Seen in the source catalog
- 2026-09-17 03:48Z
- Last indexed by Roundhouse
- 2026-09-24 09:20Z
- Last enriched (probe, favicon, geo)
- 2026-09-14 10:45Z
- x402 version
- 2
- Max timeout
- 60s
- 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 Color Convert + Contrast 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=Color%20Convert%20%2B%20Contrast' 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://keyronne.com/api/color, 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.