Registrai Arc data

by registrai.cc · remote · no sign-in to list tools · v1.0.0 · published by cc.registrai

Read-only hourly data on stablecoin apps on Arc: payments, volume, indices, verified builders.

Final · 4Changes · 12

Compare Registry entry

16 tools: 4 do something that can't be undone and 12 change things.

Scanned Oct 21, 2026

Deletes or cancels0Claude Code: deny
Can't be undone4Claude Code: ask: see these tools
Changes things12Claude Code: ask: see these tools
Only reads0Claude Code: allow

4 checks matched something in the tool definitions. No finding is not a safety guarantee. How the checks work.

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

Findings

Matches of fixed checks, with the text they matched.

4 warn

Warnarc_index_history
The server marks "arc_index_history" read-only (readOnlyHint: true), and its own name, description or input give the class "irreversible".
Matched text
annotations: {"readOnlyHint":true,"destructiveHint":false,"idempotentHint":true,"openWorldHint":false}; The input addresses people (input.to): what it sends cannot be taken back.
What this check looks for
Warnarc_app_history
The server marks "arc_app_history" read-only (readOnlyHint: true), and its own name, description or input give the class "irreversible".
Matched text
annotations: {"readOnlyHint":true,"destructiveHint":false,"idempotentHint":true,"openWorldHint":false}; The input addresses people (input.to): what it sends cannot be taken back.
What this check looks for
Warnarc_index_history_deep
The server marks "arc_index_history_deep" read-only (readOnlyHint: true), and its own name, description or input give the class "irreversible".
Matched text
annotations: {"readOnlyHint":true,"destructiveHint":false,"idempotentHint":true,"openWorldHint":false}; The input addresses people (input.to): what it sends cannot be taken back.
What this check looks for
Warnarc_app_history_deep
The server marks "arc_app_history_deep" read-only (readOnlyHint: true), and its own name, description or input give the class "irreversible".
Matched text
annotations: {"readOnlyHint":true,"destructiveHint":false,"idempotentHint":true,"openWorldHint":false}; The input addresses people (input.to): what it sends cannot be taken back.
What this check looks for

Tools

Open a tool for its reasons and full description. Descriptions are the publisher's own words, shown as they are.

16 tools

Can't be undone 4Sends, pays, publishes or merges: once done, it cannot be taken back.Claude Code: ask

arc_app_historyOne Arc app's hourly points and activity (payments, paying wallets, new payers, USD) in one index, oldest first.1 finding
Why it is in this group
- The input addresses people (input.to): what it sends cannot be taken back.
- The server marks it read-only (readOnlyHint: true), but an annotation never lowers a class.
Findings
- Warn
  The server marks "arc_app_history" read-only (readOnlyHint: true), and its own name, description or input give the class "irreversible".
  Matched text
  annotations: {"readOnlyHint":true,"destructiveHint":false,"idempotentHint":true,"openWorldHint":false}; The input addresses people (input.to): what it sends cannot be taken back.
  What this check looks for
Description, as the server wrote it
One Arc app's hourly points and activity (payments, paying wallets, new payers, USD) in one index, oldest first.
Annotations the server declares
- readOnlyHint: true
- destructiveHint: false
- idempotentHint: true
- openWorldHint: false
- title: Arc app: hourly history
arc_app_history_deepOne app's hourly points and activity for any window.1 finding
Why it is in this group
- The input addresses people (input.to): what it sends cannot be taken back.
- The server marks it read-only (readOnlyHint: true), but an annotation never lowers a class.
Findings
- Warn
  The server marks "arc_app_history_deep" read-only (readOnlyHint: true), and its own name, description or input give the class "irreversible".
  Matched text
  annotations: {"readOnlyHint":true,"destructiveHint":false,"idempotentHint":true,"openWorldHint":false}; The input addresses people (input.to): what it sends cannot be taken back.
  What this check looks for
Description, as the server wrote it
One app's hourly points and activity for any window. Paid via x402 (USDC on Arc): $0.002 via Circle Gateway or $0.01 standard. Call once to get the payment requirements, then retry with params._meta["x402/payment"].
Annotations the server declares
- readOnlyHint: true
- destructiveHint: false
- idempotentHint: true
- openWorldHint: false
- title: Arc app: full history
arc_index_historyHourly closes of one Arc index, oldest first (at most 744 hours per call).1 finding
Why it is in this group
- The input addresses people (input.to): what it sends cannot be taken back.
- The server marks it read-only (readOnlyHint: true), but an annotation never lowers a class.
Findings
- Warn
  The server marks "arc_index_history" read-only (readOnlyHint: true), and its own name, description or input give the class "irreversible".
  Matched text
  annotations: {"readOnlyHint":true,"destructiveHint":false,"idempotentHint":true,"openWorldHint":false}; The input addresses people (input.to): what it sends cannot be taken back.
  What this check looks for
Description, as the server wrote it
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.
Annotations the server declares
- readOnlyHint: true
- destructiveHint: false
- idempotentHint: true
- openWorldHint: false
- title: Arc index: hourly history
arc_index_history_deepHourly closes of one Arc index for any window (beyond the free 744 h).1 finding
Why it is in this group
- The input addresses people (input.to): what it sends cannot be taken back.
- The server marks it read-only (readOnlyHint: true), but an annotation never lowers a class.
Findings
- Warn
  The server marks "arc_index_history_deep" read-only (readOnlyHint: true), and its own name, description or input give the class "irreversible".
  Matched text
  annotations: {"readOnlyHint":true,"destructiveHint":false,"idempotentHint":true,"openWorldHint":false}; The input addresses people (input.to): what it sends cannot be taken back.
  What this check looks for
Description, as the server wrote it
Hourly closes of one Arc index for any window (beyond the free 744 h). Paid via x402 (USDC on Arc): $0.002 via Circle Gateway or $0.01 standard. Call once to get the payment requirements, then retry with params._meta["x402/payment"].
Annotations the server declares
- readOnlyHint: true
- destructiveHint: false
- idempotentHint: true
- openWorldHint: false
- title: Arc index: full history

Changes things 12Creates or changes something that can be changed back.Claude Code: ask

arc_appOne Arc app by id (e.g.No findings
Why it is in this group
- Nothing in its name or description says what it does, so it is counted as a write.
- The server marks it read-only (readOnlyHint: true), but an annotation never lowers a class.
Description, as the server wrote it
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.
Annotations the server declares
- readOnlyHint: true
- destructiveHint: false
- idempotentHint: true
- openWorldHint: false
- title: Arc app: detail
arc_appsEvery 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.No findings
Why it is in this group
- Nothing in its name or description says what it does, so it is counted as a write.
- The server marks it read-only (readOnlyHint: true), but an annotation never lowers a class.
Description, as the server wrote it
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 TVL or chains other than Arc.
Annotations the server declares
- readOnlyHint: true
- destructiveHint: false
- idempotentHint: true
- openWorldHint: false
- title: Arc apps
arc_contractFacts for one contract on Arc: label, project, recent events and USDC balance.No findings
Why it is in this group
- Nothing in its name or description says what it does, so it is counted as a write.
- The server marks it read-only (readOnlyHint: true), but an annotation never lowers a class.
Description, as the server wrote it
Facts for one contract on Arc: label, project, recent events and USDC balance. Paid via x402 (USDC on Arc): $0.005 via Circle Gateway or $0.01 standard. Call once to get the payment requirements, then retry with params._meta["x402/payment"].
Annotations the server declares
- readOnlyHint: true
- destructiveHint: false
- idempotentHint: true
- openWorldHint: false
- title: Arc contract facts
arc_ecosystemEvery project in the Arc ecosystem directory (apps, wallets, exchanges, banks, infrastructure, partners) with category and status: live on mainnet, deployed or announced.No findings
Why it is in this group
- Nothing in its name or description says what it does, so it is counted as a write.
- The server marks it read-only (readOnlyHint: true), but an annotation never lowers a class.
Description, as the server wrote it
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 category, or whether a company is on Arc. Not for token prices.
Annotations the server declares
- readOnlyHint: true
- destructiveHint: false
- idempotentHint: true
- openWorldHint: false
- title: Arc ecosystem: directory
arc_entityOne project in the Arc ecosystem directory by slug (slugs come from arc_ecosystem): summary, status with evidence, links, contracts on Arc and sources.No findings
Why it is in this group
- Nothing in its name or description says what it does, so it is counted as a write.
- The server marks it read-only (readOnlyHint: true), but an annotation never lowers a class.
Description, as the server wrote it
One project in the Arc ecosystem directory by slug (slugs come from arc_ecosystem): summary, status with evidence, links, contracts on Arc and sources.
Annotations the server declares
- readOnlyHint: true
- destructiveHint: false
- idempotentHint: true
- openWorldHint: false
- title: Arc project: detail
arc_eventsWatch-feed events on Arc: deploys, upgrades, control changes, pauses and large outflows, labelled to projects.No findings
Why it is in this group
- Nothing in its name or description says what it does, so it is counted as a write.
- The server marks it read-only (readOnlyHint: true), but an annotation never lowers a class.
Description, as the server wrote it
Watch-feed events on Arc: deploys, upgrades, control changes, pauses and large outflows, labelled to projects. Paid via x402 (USDC on Arc): $0.002 via Circle Gateway or $0.01 standard. Call once to get the payment requirements, then retry with params._meta["x402/payment"].
Annotations the server declares
- readOnlyHint: true
- destructiveHint: false
- idempotentHint: true
- openWorldHint: false
- title: Arc watch-feed events
arc_indicesLatest hourly close of the Arc Builders, Integrations and Ecosystem indices (ABI, AII, AEI), their 24 h change base and decay parameters.No findings
Why it is in this group
- Nothing in its name or description says what it does, so it is counted as a write.
- The server marks it read-only (readOnlyHint: true), but an annotation never lowers a class.
Description, as the server wrote it
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.
Annotations the server declares
- readOnlyHint: true
- destructiveHint: false
- idempotentHint: true
- openWorldHint: false
- title: Arc indices: latest
arc_members_dayEvery member's hourly rows and the ABI, AII and AEI closes for one UTC day.No findings
Why it is in this group
- Nothing in its name or description says what it does, so it is counted as a write.
- The server marks it read-only (readOnlyHint: true), but an annotation never lowers a class.
Description, as the server wrote it
Every member's hourly rows and the ABI, AII and AEI closes for one UTC day. Paid via x402 (USDC on Arc): $0.03 via Circle Gateway or $0.05 standard. Call once to get the payment requirements, then retry with params._meta["x402/payment"].
Annotations the server declares
- readOnlyHint: true
- destructiveHint: false
- idempotentHint: true
- openWorldHint: false
- title: Arc apps: one day
arc_new_appsArc apps first seen in an index after a given hour.No findings
Why it is in this group
- Nothing in its name or description says what it does, so it is counted as a write.
- The server marks it read-only (readOnlyHint: true), but an annotation never lowers a class.
Description, as the server wrote it
Arc apps first seen in an index after a given hour. Use this when asked what is new on Arc.
Annotations the server declares
- readOnlyHint: true
- destructiveHint: false
- idempotentHint: true
- openWorldHint: false
- title: Arc apps: newly seen
arc_numbersChain-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, eac…No findings
Why it is in this group
- Nothing in its name or description says what it does, so it is counted as a write.
- The server marks it read-only (readOnlyHint: true), but an annotation never lowers a class.
Description, as the server wrote it
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 is, how much USDC is on Arc, or Arc's TVL or volume.
Annotations the server declares
- readOnlyHint: true
- destructiveHint: false
- idempotentHint: true
- openWorldHint: false
- title: Arc in numbers
arc_project_scopeEvery contract attributed to one project.No findings
Why it is in this group
- Nothing in its name or description says what it does, so it is counted as a write.
- The server marks it read-only (readOnlyHint: true), but an annotation never lowers a class.
Description, as the server wrote it
Every contract attributed to one project. Paid via x402 (USDC on Arc): $0.01 via Circle Gateway or $0.02 standard. Call once to get the payment requirements, then retry with params._meta["x402/payment"].
Annotations the server declares
- readOnlyHint: true
- destructiveHint: false
- idempotentHint: true
- openWorldHint: false
- title: Arc project contracts
arc_verifiedArc projects whose builder proof validates against the Arc mainnet builder registry.No findings
Why it is in this group
- Nothing in its name or description says what it does, so it is counted as a write.
- The server marks it read-only (readOnlyHint: true), but an annotation never lowers a class.
Description, as the server wrote it
Arc projects whose builder proof validates against the Arc mainnet builder registry.
Annotations the server declares
- readOnlyHint: true
- destructiveHint: false
- idempotentHint: true
- openWorldHint: false
- title: Arc builders: verified

This is not a safety rating, and no finding is not a safety guarantee. The groups and findings come from fixed checks of the tool definitions the server returned on the date shown, not from its code or what it does when called. How the checks work.

Install

Pinned to version 1.0.0. Values in angle brackets are yours to fill in.

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

Run in a terminal.

Claude Code permissions

Allow the reads, ask before a change, deny the deletes. Paste into .claude/settings.json.

.claude/settings.json

{
  "permissions": {
    "allow": [],
    "ask": [
      "mcp__arc-data__arc_indices",
      "mcp__arc-data__arc_index_history",
      "mcp__arc-data__arc_apps",
      "mcp__arc-data__arc_app",
      "mcp__arc-data__arc_app_history",
      "mcp__arc-data__arc_new_apps",
      "mcp__arc-data__arc_verified",
      "mcp__arc-data__arc_ecosystem",
      "mcp__arc-data__arc_entity",
      "mcp__arc-data__arc_numbers",
      "mcp__arc-data__arc_index_history_deep",
      "mcp__arc-data__arc_app_history_deep",
      "mcp__arc-data__arc_members_day",
      "mcp__arc-data__arc_events",
      "mcp__arc-data__arc_contract",
      "mcp__arc-data__arc_project_scope"
    ],
    "deny": []
  }
}

Tools that only read are allowed, tools that change things ask first, tools that delete or cancel are denied. It assumes the server is installed as arc-data. Review it before you use it.

Keep track

Get told when this server's tools change: a new tool, a new description, a new class.

https://anlyon.dev/servers/cc.registrai/arc-data/changes.xml

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Source: MCP Registry. Synced Oct 21, 2026, 17:46 UTC.

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