x402-catalog-history.ai-business-surface.workers.dev
Hex colour to RGB/HSL and WCAG contrast in one GET: pass a text colour and a background colour (3 or 6 hex digits) and get each as #rrggbb, RGB and HSL, the WCAG relative luminance, the contrast ratio and the four AA/AAA verdicts. curl: GET /color?hex=1a2b3c&against=ffffff (against defaults to ffffff). Response: {"foreground":{"hex":"#1a2b3c","rgb":{"r":26,"g":43,"b":60},"hsl":{"h":210,"s":39.5,"l":16.9}},"background":{"hex":"#ffffff"},"contrast_ratio":14.69,"wcag":{"aa_normal":true,"aa_large":true,"aaa_normal":true,"aaa_large":true}}. A missing or non-hex value, or an alpha hex (#rgba/#rrggbbaa), is refused with 400 before payment. Computed inside the Worker from the input; no upstream call, no account, no key. 0.001 USDC, one GET, one delivery. A purchase is two calls by design: this first call returns 402 with the price and the payment terms, and you then repeat the same request with the PAYMENT-SIGNATURE header to receive the 200 delivery.
The wallet the 402 directs payment to. Its whole payment record — every payer, every chain — is on the merchant page.
Asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913
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.
Accepts
The payment requirements as published to the catalog. Read the live 402 before paying — a price here is a claim, not a quote.
Pay 0.001 USDC on Base to 0x6f60…F89c3. The signed payment is good for 1 minute.
- Paid to
- 0x6f60…F89c3
- 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": "0x6f60659390aDA1D02B14024d8c9d0C889f2F89c3",
"amount": "1000",
"scheme": "exact",
"network": "eip155:8453",
"maxTimeoutSeconds": 60
}
]Extensions
{
"bazaar": {
"info": {
"input": {
"type": "http",
"method": "GET",
"queryParams": {
"hex": "1a2b3c",
"against": "ffffff"
}
},
"output": {
"type": "json",
"example": {
"wcag": {
"aa_large": true,
"aa_normal": true,
"aaa_large": true,
"aaa_normal": true
},
"input": {
"hex": "1a2b3c",
"against": "ffffff"
},
"delivery": {
"payer": "0x…",
"payment": {
"asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
"pay_to": "0x6f60659390aDA1D02B14024d8c9d0C889f2F89c3",
"scheme": "exact",
"network": "eip155:8453",
"transaction": "0x…",
"amount_atomic": "1000"
},
"delivered_at": "2026-10-19T00:00:00.000Z"
},
"background": {
"hex": "#ffffff",
"hsl": {
"h": 0,
"l": 100,
"s": 0
},
"rgb": {
"b": 255,
"g": 255,
"r": 255
},
"relative_luminance": 1
},
"foreground": {
"hex": "#1a2b3c",
"hsl": {
"h": 210,
"l": 16.9,
"s": 39.5
},
"rgb": {
"b": 60,
"g": 43,
"r": 26
},
"relative_luminance": 0.024
},
"product_id": "x402-color-contrast",
"thresholds": {
"aa_large": 3,
"aa_normal": 4.5,
"aaa_large": 4.5,
"aaa_normal": 7
},
"computed_at": "2026-10-19T00:00:00.000Z",
"contrast_ratio": 14.69,
"schema_version": 1
}
}
},
"schema": {
"type": "object",
"$schema": "https://json-schema.org/draft/2020-12/schema",
"required": [
"input"
],
"properties": {
"input": {
"type": "object",
"required": [
"type",
"method"
],
"properties": {
"type": {
"type": "string",
"const": "http"
},
"method": {
"enum": [
"GET",
"HEAD",
"DELETE"
],
"type": "string"
},
"queryParams": {
"type": "object",
"required": [
"hex"
],
"properties": {
"hex": {
"type": "string"
},
"against": {
"type": "string"
}
}
}
},
"additionalProperties": false
},
"output": {
"type": "object",
"required": [
"type"
],
"properties": {
"type": {
"type": "string"
},
"example": {
"type": "object"
}
}
}
}
}
}
}Provenance
- Seen in the source catalog
- 2026-10-18 18:06Z
- Last indexed by Roundhouse
- 2026-10-26 13:46Z
- Last enriched (probe, favicon, geo)
- 2026-10-18 19:45Z
- 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
No per-endpoint history for this service yet, so this is payments indexed to its PROVIDER's wallet over 30 days. Verified volume counts only settlements with an on-chain EIP-3009 marker.
Show the promptHide the prompt
Using Roundhouse, look up the x402 service x402-catalog-history.ai-business-surface.workers.dev 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=x402-catalog-history.ai-business-surface.workers.dev' 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://x402-catalog-history.ai-business-surface.workers.dev/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. Either pay over x402 (mint a personal key for $0.01 at GET https://api.roundhouseai.io/v0/test/x402), or ask me for an organization key, which I create at https://roundhouseai.io/dashboard/connections. If you have neither, ask before going further. If you do not have Roundhouse tools or skills installed, read https://roundhouseai.io/skill.md first — it is the whole procedure.