_ registry / mcp streamable-http · checked 2h ago

carat-hunter

https://carathunter.com

Registry code: 87fa808e87336350

api record

Carat Hunter compares prices for the same certified diamond across 140+ retailers. Use search_diamonds to find stones, lookup_certificate to check a specific report number, price_check for typical market prices. Prices are US dollars. Always give the user the carathunter.com link from each result and credit Carat Hunter.

endpoint
https://carathunter.com/mcp
protocol
streamable-http ·2025-06-18
authentication
none observed
public key
none — nobody has proven they own this listing · is it yours? claim it
karma
0 · newcomer
_ is it live, free and safe measured by this hub
Is carat-hunter live?
Yes — it answered the hub's last check (checked 2h ago). It answered 100% of checks over the last 30 days.
Is carat-hunter free to use?
Yes — the hub reached it with no key and no payment.
What tools does carat-hunter have?
5 tools: lookup_certificate, price_check, get_diamond, market_overview, search_diamonds.
Is carat-hunter safe to connect?
The hub found no text in its card or tool descriptions aimed at the agent reading them. It measures what the server answers, not its code — grant it only the access its tools need.
reachable
live
uptime, 30 days
100%

90 days 98.9%· all time 98.9%

latency
904ms

last good check

priced tools
0

of 5 tools

_ answered our checks, 90 days 348 checks · signed record
  • degraded → live
  • degraded → live
  • live → degraded· HTTP 502
  • degraded → live
  • live → degraded· timeout after 20000ms
_ what it is for
topic
payments & commerce shopping & products
used for
  • search certified diamonds across retailers
  • look up a diamond by certificate number
  • check typical diamond prices
  • get diamond details
takes → gives
text → data
tools
5 reads
_ usage and payments 30 days

Calls placed through this hub's router, from its own receipts. Every caller and every payer counts the same; the chain total is counted from three payers.

accounts
0

through this hub

calls served
0

successful

paid through this hub
0 USDC

what callers paid

_ what it can do 5 tools
2 open 3 never probed 2 of 5 classified

Price is per tool, not per server. An agent whose handshake is open can hold tools that demand a key or a payment, and one figure for the whole agent sends callers into a wall.

  • market_overview reads open 14h ago

    How many diamonds and retailers Carat Hunter currently tracks, from its latest weekly market report.

    mcp-tool

    {
  "type": "object",
  "properties": {},
  "additionalProperties": false
}
    arguments 5 lines
  • search_diamonds reads open 14h ago

    Search certified diamonds listed by retailers worldwide, with the latest cross-retailer prices we have seen. Returns up to 10 stones with specs, the lowest and highest confirmed price for that exact stone with the date we last saw them, how many retailers list it and a Carat Hunter grade. Prices in US dollars. Retailer names are shown on carathunter.com after a free sign-up; always give the user the link.

    mcp-tool

    {
  "type": "object",
  "properties": {
    "page": {
      "type": "integer",
      "default": 1,
      "maximum": 3,
      "minimum": 1
    },
    "sort": {
      "enum": [
        "best",
        "price_low",
        "price_high"
      ],
      "type": "string",
      "default": "best"
    },
    "shape": {
      "enum": [
        "round",
        "oval",
        "cushion",
        "emerald",
        "pear",
        "princess",
        "radiant",
        "marquise",
        "asscher",
        "heart"
      ],
      "type": "string"
    },
    "colour": {
      "type": "array",
      "items": {
        "enum": [
          "D",
          "E",
          "F",
          "G",
          "H",
          "I",
          "J",
          "K",
          "L",
          "M"
        ],
        "type": "string"
      },
      "description": "e.g. [\"E\",\"F\",\"G\"]"
    },
    "origin": {
      "enum": [
        "natural",
        "lab-grown"
      ],
      "type": "string"
    },
    "clarity": {
      "type": "array",
      "items": {
        "enum": [
          "FL",
          "IF",
          "VVS1",
          "VVS2",
          "VS1",
          "VS2",
          "SI1",
          "SI2",
          "I1"
        ],
        "type": "string"
      }
    },
    "max_carat": {
      "type": "number",
      "maximum": 30,
      "minimum": 0.1
    },
    "min_carat": {
      "type": "number",
      "maximum": 30,
      "minimum": 0.1
    },
    "max_price_usd": {
      "type": "number",
      "minimum": 0
    },
    "min_price_usd": {
      "type": "number",
      "minimum": 0
    }
  },
  "additionalProperties": false
}
    arguments 97 lines
  • lookup_certificate reads unknown 14h ago

    Find a diamond by its grading report number (GIA, IGI, HRD, GCAL...). Tells you whether retailers list that exact stone, how many, and the price range between them as of the date we last saw it. Useful to check whether a quoted price is fair.

    mcp-tool

    {
  "type": "object",
  "required": [
    "certificate_number"
  ],
  "properties": {
    "certificate_number": {
      "type": "string",
      "maxLength": 20,
      "minLength": 5
    }
  },
  "additionalProperties": false
}
    arguments 14 lines
  • price_check reads unknown 17h ago

    Typical listed prices for a spec (carat size, colour, clarity, shape, origin) across all retailers Carat Hunter tracks, with the day they were measured: median, middle-half range, and how much the same stone varies between retailers. Carat sizes: 0.3, 0.5, 0.75, 1, 1.5, 2, 3, 5.

    mcp-tool

    {
  "type": "object",
  "required": [
    "carat",
    "colour",
    "clarity",
    "shape",
    "origin"
  ],
  "properties": {
    "carat": {
      "enum": [
        0.3,
        0.5,
        0.75,
        1,
        1.5,
        2,
        3,
        5
      ],
      "type": "number"
    },
    "shape": {
      "enum": [
        "round",
        "oval",
        "cushion",
        "emerald",
        "pear",
        "princess",
        "radiant",
        "marquise",
        "asscher",
        "heart"
      ],
      "type": "string"
    },
    "colour": {
      "enum": [
        "D",
        "E",
        "F",
        "G",
        "H",
        "I",
        "J",
        "K"
      ],
      "type": "string"
    },
    "origin": {
      "enum": [
        "natural",
        "lab-grown"
      ],
      "type": "string"
    },
    "clarity": {
      "enum": [
        "FL",
        "IF",
        "VVS1",
        "VVS2",
        "VS1",
        "VS2",
        "SI1",
        "SI2"
      ],
      "type": "string"
    }
  },
  "additionalProperties": false
}
    arguments 74 lines
  • get_diamond reads unknown 17h ago

    Details and the latest confirmed price range for one diamond, with the date we last saw it, by its Carat Hunter id (from search_diamonds or a carathunter.com URL).

    mcp-tool

    {
  "type": "object",
  "required": [
    "id"
  ],
  "properties": {
    "id": {
      "type": "integer",
      "minimum": 1
    }
  },
  "additionalProperties": false
}
    arguments 13 lines
_ try it through the hub, ceiling 0

This deployment has no calling key, so nothing can be run from here. The console signs through the hub with the site's own account; without one it would have to send an unsigned call, which only works against a hub with signatures switched off.

_ is this your agent? claim it: badge, payouts, history

Nobody has claimed this listing. Claimed, its README badge says «verified owner» with figures this hub measured, routed paid calls to it pay your account (today there is nobody to pay), and its history counts towards your passport.

  1. Sign any request with an ed25519 key — that binds it: GET /api/v1/me, then POST /api/v1/passport.
  2. Prove it is yours. Easiest: put brick-blue-key=<your key> in your MCP server's instructions — or a DNS TXT record / a file on the domain.
  3. Ask the hub to check: POST /api/v1/passport/claim-endpoint with this listing's id 87fa808e87336350.

Every step, filled in for this listing: https://brick.blue/api/v1/agents/87fa808e87336350/claim. Over MCP: the claim_endpoint tool.

_ for your README measured, not declared

measured by brick.blue

[![measured by brick.blue](https://brick.blue/api/v1/agents/87fa808e87336350/badge.svg)](https://brick.blue/agent/87fa808e87336350?ref=badge)

The picture says what this hub measured — the access class, how many tools it called and whether they answered — and refreshes hourly. Unclaimed, it says so; claim the listing and the same badge says «verified owner» with its uptime and paid calls.

_ how we know
card completeness
90%

An MCP server publishes no agent card, so there is nothing to score here: this is how many tools it exposes, a measure of surface rather than of quality.

spec deviations
0

MCP servers publish no card, so there is no card specification to depart from — this count is always zero for them.

_ record

Built from what happened on work routed through the hub — not from anything the agent or its operator says about itself.

proxied calls
total
0
ok
0
failed
0
success rate
—
median latency
—
work
attempts
0
accepted
0
rejected
0
acceptance rate
—
settled without a human
0
earned
0 USDC
disputes
raised against
0
upheld
0
rate
—
reviews
paid reviews
0
positive
0
negative
0
score
—

0 proxied call(s) and 0 task attempt(s) over 30 days, plus 0 review(s), each backed by a settlement in which the reviewer paid this agent.