# Registrai Arc data (remote · builder.registrai.cc)

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

- Trust score: 68/100 (medium)
- Registry status: active
- Liveness: live
- Owner verified: no
- Last scored: 2026-10-18

## Components

- remote · `builder.registrai.cc`: 68/100 (this document), [markdown](https://verifymcp.io/servers/cc-registrai-arc-data/api-mcp.md), [page](https://verifymcp.io/servers/cc-registrai-arc-data/api-mcp)

## Channel facts

- Endpoint: `https://builder.registrai.cc/api/mcp`
- Transports: `streamable-http`
- Auth: `none`
- Version: `1.0.0`

## Trust breakdown

How this component scores in each security and reliability category. Every signal is checked automatically against the live server, and we only credit what we can confirm. Scores are 0–100 per category. Scoring method: https://verifymcp.io/docs/scoring (what has changed: https://verifymcp.io/docs/scoring/changelog)

Scored 2026-10-18.

- **Endpoint Security**: 74/100
  - The endpoint's TLS certificate is valid, in date, and uses a strong key.
  - No authorisation is required to call this server. Every tool declares its destructiveHint and none is destructive, so open access doesn't expose one.
  - HTTPS is enforced; there's no plaintext access path.
  - HSTS check failed: the Strict-Transport-Security header is absent.
  - DNSSEC check failed: this domain isn't protected by DNSSEC.
- **Transport & Reachability**: 100/100
  - Verified streamable-http transport via a live MCP handshake.
- **Schema Quality & AI Usability**: 67/100
  - AI-judged instruction clarity (good).
  - Tool/resource definitions use about 1350 tokens (~103/item across 13 items; 13 tools + 0 resources), lean.
  - Usage-examples check failed: none of the tools include examples.
- **Stability & Change Management**: 7/100
  - Stability observed for 2 of 30 days with no destabilising changes; credit accrues until the full window elapses.
- **Tool Coverage**: 82/100
  - 100% of tools have a non-trivial description (not blank, and not just the tool's name).
  - 45% of tool parameters carry a description.
- **Tool Safety**: 100/100
  - No prompt-injection markers were found in the server instructions, tool names or descriptions we captured.
  - We read all 13 captured tool definition(s), and no name or description among them implies an irreversible operation.
  - An AI judge read all 14 captured unit(s) of tool text and found none that tries to manipulate the model reading it.
- **Capabilities**: 60/100
  - Spec-recency check failed: implements MCP spec 2025-06-18; the latest is 2026-07-28.

## Install

### How do I install the Registrai Arc data MCP server?

Registrai Arc data is a hosted endpoint at https://builder.registrai.cc/api/mcp, so there is nothing to install locally. Ready-made configuration for Claude, Cursor, VS Code, Codex and 5 more is on this page, copied from each client's own documentation.

### Claude

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

### Cursor

```json
{
  "mcpServers": {
    "cc-registrai-arc-data": {
      "url": "https://builder.registrai.cc/api/mcp"
    }
  }
}
```

### VS Code

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

### Codex

```toml
[mcp_servers.cc-registrai-arc-data]
url = "https://builder.registrai.cc/api/mcp"
```

### opencode

```json
{
  "$schema": "https://opencode.ai/config.json",
  "mcp": {
    "cc-registrai-arc-data": {
      "type": "remote",
      "url": "https://builder.registrai.cc/api/mcp",
      "enabled": true
    }
  }
}
```

### OpenClaw

```bash
openclaw mcp add cc-registrai-arc-data --url 'https://builder.registrai.cc/api/mcp' --transport streamable-http
```

### Hermes

```yaml
mcp_servers:
  cc-registrai-arc-data:
    url: "https://builder.registrai.cc/api/mcp"
```

### Netclaw

```json
{
  "McpServers": {
    "cc-registrai-arc-data": {
      "Transport": "http",
      "Url": "https://builder.registrai.cc/api/mcp"
    }
  }
}
```

### Vellum

```bash
assistant mcp add cc-registrai-arc-data -t streamable-http -u 'https://builder.registrai.cc/api/mcp'
```

### Other

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

The mcpServers block is a cross-client convention. Remote transports vary, so check your client's docs.

## Changelog

Every change recorded for this component, newest first. Days that predate change tracking, or that we cannot explain, say so: "we were watching and nothing happened" and "we were not watching" are different claims.

### 2026-10-18 (score 68, +1)

- [security] Tool “arc_app” rewrote its description, which is the text the model reads
- [security] Tool “arc_app_history” rewrote its description, which is the text the model reads
- [security] Tool “arc_apps” rewrote its description, which is the text the model reads
- [security] Tool “arc_index_history” rewrote its description, which is the text the model reads
- [security] Tool “arc_indices” rewrote its description, which is the text the model reads
- [security] Tool “arc_new_apps” rewrote its description, which is the text the model reads
- [security] Tool “arc_verified” rewrote its description, which is the text the model reads
- [cosmetic] Tool “arc_app” changed its title: Arc app: detail
- [cosmetic] Tool “arc_app_history” changed its title: Arc app: hourly history
- [cosmetic] Tool “arc_app_history_deep” changed its title: Arc app: full history
- [cosmetic] Tool “arc_apps” changed its title: Arc stablecoin apps
- [cosmetic] Tool “arc_contract” changed its title: Arc contract facts
- [cosmetic] Tool “arc_events” changed its title: Arc watch-feed events
- [cosmetic] Tool “arc_index_history” changed its title: Arc index: hourly history
- [cosmetic] Tool “arc_index_history_deep” changed its title: Arc index: full history
- [cosmetic] Tool “arc_indices” changed its title: Arc indices: latest
- [cosmetic] Tool “arc_members_day” changed its title: Arc apps: one day
- [cosmetic] Tool “arc_new_apps” changed its title: Arc apps: newly seen
- [cosmetic] Tool “arc_project_scope” changed its title: Arc project contracts
- [cosmetic] Tool “arc_verified” changed its title: Arc builders: verified

### 2026-10-17 (score 67, 0)

- [functional regression] Schema quality: 75 → 97
- [functional regression] Tool coverage: 73% → 45%
- [functional improvement] Stability: unverified → 0.03
- [functional] New tool “arc_app_history_deep”
- [functional] New tool “arc_contract”
- [functional] New tool “arc_events”
- [functional] New tool “arc_index_history_deep”
- [functional] New tool “arc_members_day”
- [functional] New tool “arc_project_scope”

### 2026-10-16 (score 67)

First indexed and scored.

## MCP tools (13)

### `arc_indices` (~53 tokens)

Arc indices: latest

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` (~138 tokens)

Arc index: hourly 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.

Input parameters:

- `from` (string): First hour (inclusive). An ISO hour close, e.g. 2026-10-14T19:00:00Z.
- `index` (string, required): abi = builder apps, aii = integrations, aei = both plus the Arc base layer
- `to` (string): Last hour (inclusive). An ISO hour close, e.g. 2026-10-14T19:00:00Z.

### `arc_apps` (~86 tokens)

Arc stablecoin apps

Every stablecoin 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.

Input parameters:

- `sort` (string)

### `arc_app` (~62 tokens)

Arc app: detail

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.

Input parameters:

- `id` (string, required)

### `arc_app_history` (~137 tokens)

Arc app: hourly history

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

Input parameters:

- `from` (string): First hour (inclusive). An ISO hour close, e.g. 2026-10-14T19:00:00Z.
- `id` (string, required)
- `index` (string, required): abi = builder apps, aii = integrations, aei = both plus the Arc base layer
- `to` (string): Last hour (inclusive). An ISO hour close, e.g. 2026-10-14T19:00:00Z.

### `arc_new_apps` (~93 tokens)

Arc apps: newly seen

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

Input parameters:

- `index` (string, required): abi = builder apps, aii = integrations, aei = both plus the Arc base layer
- `since` (string, required): Members first seen after this hour. An ISO hour close, e.g. 2026-10-14T19:00:00Z.

### `arc_verified` (~22 tokens)

Arc builders: verified

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

### `arc_index_history_deep` (~168 tokens)

Arc index: full history

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"].

Input parameters:

- `from` (string): First hour (inclusive). An ISO hour close, e.g. 2026-10-14T19:00:00Z.
- `index` (string, required): abi = builder apps, aii = integrations, aei = both plus the Arc base layer
- `to` (string): Last hour (inclusive). An ISO hour close, e.g. 2026-10-14T19:00:00Z.

### `arc_app_history_deep` (~167 tokens)

Arc app: full history

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"].

Input parameters:

- `from` (string): First hour (inclusive). An ISO hour close, e.g. 2026-10-14T19:00:00Z.
- `id` (string, required)
- `index` (string, required): abi = builder apps, aii = integrations, aei = both plus the Arc base layer
- `to` (string): Last hour (inclusive). An ISO hour close, e.g. 2026-10-14T19:00:00Z.

### `arc_members_day` (~85 tokens)

Arc apps: one day

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"].

Input parameters:

- `date` (string, required): YYYY-MM-DD (UTC).

### `arc_events` (~156 tokens)

Arc watch-feed events

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"].

Input parameters:

- `contract` (string)
- `kind` (string)
- `labelled` (string)
- `limit` (string)
- `min_balance` (string)
- `min_project_usdc_24h` (string)
- `project` (string)
- `since_block` (string)
- `since_ts` (string)
- `until_block` (string)

### `arc_contract` (~77 tokens)

Arc contract facts

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"].

Input parameters:

- `address` (string, required)

### `arc_project_scope` (~81 tokens)

Arc project contracts

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"].

Input parameters:

- `limit` (string)
- `offset` (string)
- `source` (string, required)

## Diagnostics

Captured diagnostic sections: TLS, DNSSEC, Authorisation, Transports. The full working is on the page: https://verifymcp.io/servers/cc-registrai-arc-data/api-mcp#diagnostics

## Score history

- 2026-10-18: 68
- 2026-10-17: 67
- 2026-10-16: 67

## Common questions

### What is the Registrai Arc data MCP server?

Registrai Arc data is an MCP server listed in the public MCP registry as cc.registrai/arc-data. Read-only hourly data on stablecoin apps on Arc: payments, volume, indices, verified builders. This page covers its hosted endpoint (https://builder.registrai.cc/api/mcp).

### Is the Registrai Arc data MCP server safe to use?

Registrai Arc data scores 68 out of 100 on VerifyMCP. That is a record of what we were able to check automatically, not an endorsement. The category breakdown on this page shows every signal behind the number, including the ones we could not confirm.

### What tools does the Registrai Arc data MCP server expose?

Registrai Arc data exposes 13 tools: arc_indices, arc_index_history, arc_apps, arc_app, arc_app_history, and 8 more. Their descriptions and schemas cost roughly 1,325 tokens of context every time the server is loaded.

### Does the Registrai Arc data MCP server require authentication?

No. We connected to Registrai Arc data without credentials and it answered, so anything it exposes is reachable by anyone who knows the address.

### Is the Registrai Arc data MCP server still maintained?

Registrai Arc data is still listed as active in the MCP registry. We last reached this channel on 18 October 2026. Those dates come from our own scans of the registry and the channel itself, not from anything the publisher announced.

## Links

- Remote endpoint: https://builder.registrai.cc/api/mcp
- Website: https://builder.registrai.cc/data-api/
- Changelog RSS feed: https://verifymcp.io/servers/cc-registrai-arc-data/api-mcp.xml
- Changelog JSON feed: https://verifymcp.io/servers/cc-registrai-arc-data/api-mcp.json
- HTML version of this page: https://verifymcp.io/servers/cc-registrai-arc-data/api-mcp