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Registrai MCP server

Which MCP servers are Registrai's own, from the official registry and from asking its own domain, whether they answer, and what they offer. A program checked each of these, nobody copied them from a product page.

read 2026-10-28

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Whose server it is
  • Registry namecc.registrai/arc-dataverified in the MCP registry

The registry name sits under registrai.cc. The registry only lets a publisher use that namespace after proving control of the domain through DNS or HTTP.

When we asked itchecked 2026-10-28
  • Stateanswerschecked 2026-10-28
  • Tools11
  • Server calls itselfregistrai-arc-data
  • Server version1.0.0
  • Protocol version2025-06-18

On 2026-10-28 the server answered initialize and tools/list without a sign-in. First answer in 320 ms.

Should an agent connect itNot proven either way yet
  • Whether its tools do the product's job has not been judged yet.

Once connected

  • For "compare hourly activity of apps on Arc", the likely first call is arc_apps.
  • Parameters are untyped or undescribed in 5 of 11 tools: check arguments before calling.

Said by rules from the measurements above. The likely first call is a model's pick from the tool list; read its description before relying on it.

Measured dailydaily checks: 8, the first on 2026-10-28
  • INITE MCP score98 of 100answers 100 · definitions 92 · context 100 · connects 100
  • Answered100% of days8 of 8 daily checks
  • Median first answer247 ms
  • Space in an agent's context≈ 1,275 tokensthe definitions of all its tools (11), which an agent carries on every turn
  • Tool definitionsA · 92 of 100
  • Typed results0 of 11 toolsdeclared outputSchema: results come typed, read once
  • Parameters without a description: in 5 of 11

What an agent can do with it

  • can do · compare hourly activity of apps on Arc
  • not sure · check projects before listing or hosting them
  • not sure · review who controls a project and where its money goes

Each of the product's use cases, put to Jev against this server's tool list: can an agent do it with these tools?

Worth a look

None of the five warning signs in these definitions.

A program checks the server once a day: initialize and tools/list, no model. Tokens are the definitions' length at about four characters a token. The grade averages six checks of every tool's name, description, schema and annotations; it says how well the tools are described, not whether they work. The score weighs what was measured and nothing else: answering (25%), doing the product's job (25%), definitions (20%), context (10%), use (10%) and how readily a client connects (10%). A part that was not measured is left out, and a hidden instruction caps the score at 40. The state of vendors' MCP servers: method and numbers →

Tools it offers11 tools · read 2026-10-28
  • arc_indices

    Latest hourly close of the Arc Builders, Integrations and Ecosystem indices (ABI, AII, AEI), their 24 h change base and decay parameters. Use this when asked how Arc app activity is trending overall.

  • arc_index_history

    Hourly closes of one Arc index, oldest first (at most 744 hours per call). Use this for charts or changes over a window of up to 31 days.

  • arc_apps

    Every app on Arc in the indices with its last 24 h of stablecoin payments (USDC, EURC) and USD volume, verified status and first-seen hour. Use this when asked which apps use USDC on Arc, or which are most used. Not for token prices, DeFi…

  • arc_app

    One Arc app by id (e.g. domain:archery.wtf, integration:uniswap; ids come from arc_apps): last 24 h, contracts count, verified status and the last 7 days of hourly rows.

  • arc_app_history

    One Arc app's hourly points and activity (payments, paying wallets, new payers, USD) in one index, oldest first.

  • arc_new_apps

    Arc apps first seen in an index after a given hour. Use this when asked what is new on Arc.

  • arc_verified

    Arc projects whose builder proof validates against the Arc mainnet builder registry.

  • arc_ecosystem

    Every project in the Arc ecosystem directory (apps, wallets, exchanges, banks, infrastructure, partners) with category and status: live on mainnet, deployed or announced. Use this when asked what exists on Arc, which projects are in a…

  • arc_entity

    One project in the Arc ecosystem directory by slug (slugs come from arc_ecosystem): summary, status with evidence, links, contracts on Arc and sources.

  • arc_numbers

    Chain-level Arc numbers: USDC and EURC supply, all stablecoins and TVL (from DefiLlama), estimated 24 h stablecoin volume, apps and projects, index closes and a dated timeline, each with its source and date. Use this when asked how big…

  • arc_apps_week

    Apps on Arc ranked by stablecoin payments received in the last 7 days (USD, payments, new paying wallets) and the hour each was first seen in Registrai's index. Use this when asked which apps on Arc are most used, which accept USDC, or…

How to connect

Add the server to your MCP client config. Claude Desktop, Cursor and most other clients read this shape:

{
  "mcpServers": {
    "arc-data": {
      "type": "http",
      "url": "https://builder.registrai.cc/api/mcp"
    }
  }
}

Add it

Claude Code, in a terminal

claude mcp add --transport http registrai https://builder.registrai.cc/api/mcp

Add to CursorAdd to VS Code

claude.ai, ChatGPT and other clients: add https://builder.registrai.cc/api/mcp as a custom connector in the settings.

Each line is something a program found when it went looking: the registry entry, the server's own answer, a spec that parses. A missing line means we did not find it, not that it does not exist.