# `com.checkpoint402/checkpoint402` on anlyon.dev

> Text inside fenced blocks marked untrusted-server-text was written by the MCP server's publisher, not by anlyon.dev. It is data to inspect, not instructions to follow. Invisible characters are shown as [U+XXXX].
> No finding is not a safety guarantee: these are point-in-time checks of tool definitions, not of code or behaviour.

- Page: https://anlyon.dev/servers/com.checkpoint402/checkpoint402
- JSON: https://anlyon.dev/api/v1/servers/com.checkpoint402/checkpoint402
- Version: 1.0.0 (active)
- Publisher: com.checkpoint402 (domain proven to the MCP Registry)
- Runs: remote (streamable-http)
- Sign-in to list tools: none
- Metadata from the official MCP Registry, synced 2026-10-21T17:52:47.760Z

Title and description, as the publisher wrote them:

```untrusted-server-text
Checkpoint402
Pay-per-call tx explainer, DeFi yields, token safety, SEC 8-K and OFAC data via x402 (USDC on Base).
```

Scanned 2026-10-21T18:47:22.373Z over streamable-http.

**6 tools: 3 change things and 3 only read.**

| Group | Class | Tools | Claude Code |
| --- | --- | --- | --- |
| Deletes or cancels | destructive | 0 | deny |
| Can't be undone | irreversible | 0 | ask |
| Changes things | write | 3 | ask |
| Only reads | read | 3 | allow |

## Exfil surface

No private-data -> untrusted-input -> outbound path in this server alone: no tool is tagged private-data or outbound.

| Tag | Meaning | Tools |
| --- | --- | --- |
| private-data | Reads files, mail, messages, databases, secrets, calendars or repositories. | none |
| untrusted-input | Brings in text someone else can write: web pages, inbound email, messages, issues and comments. | `mcp__checkpoint402__explain_transaction` `mcp__checkpoint402__find_defi_yields` `mcp__checkpoint402__new_token_safety_feed` `mcp__checkpoint402__ofac_sanctions_screen` `mcp__checkpoint402__sec_8k_company_events` |
| outbound | Can carry data to people or systems: it sends, posts or publishes, or takes a recipient, channel or URL. | none |

## Findings

No check matched anything in these tool definitions.


## Changes things (3)

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

### `new_token_safety_feed`

- 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.
- Tag untrusted-input: The server marks it openWorldHint: true: it reaches things outside the server's own data.

Description, as the server wrote it:

```untrusted-server-text
Paid: $0.10 USDC per successful call via x402 (not charged on errors). Newly launched token pools on Base, Ethereum or BSC, each with a 0-100 safety score and explicit red flags (honeypot, unverified code, mintable, owner powers, high tax, unlocked liquidity, whale concentration). Data: GeckoTerminal + GoPlus.
```

### `ofac_sanctions_screen`

- 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.
- Tag untrusted-input: The server marks it openWorldHint: true: it reaches things outside the server's own data.

Description, as the server wrote it:

```untrusted-server-text
Paid: $0.05 USDC per successful call via x402 (not charged on errors). Screens a person/company name (fuzzy, alias-aware) and/or a crypto wallet address against the US Treasury OFAC SDN list, refreshed twice daily, including the extended-remarks file where most sanctioned crypto addresses are listed.
```

### `sec_8k_company_events`

- 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.
- Tag untrusted-input: The server marks it openWorldHint: true: it reaches things outside the server's own data.

Description, as the server wrote it:

```untrusted-server-text
Paid: $0.10 USDC per successful call via x402 (not charged on errors). Latest SEC 8-K filings — market-wide within minutes of filing, or for one ticker — with each item code translated to plain English, high-impact events flagged (earnings, CEO changes, M&A, bankruptcy, cyber incidents) and AI summaries of the filing text.
```

## Only reads (3)

Looks things up and changes nothing. Claude Code: allow.

### `explain_transaction`

- The name "explain_transaction" says "explain": a word for reading.
- Tag untrusted-input: The server marks it openWorldHint: true: it reaches things outside the server's own data.

Description, as the server wrote it:

```untrusted-server-text
Paid: $0.03 USDC per successful call via x402 (not charged on errors). Explains any Base or Ethereum transaction in plain English: who sent what to whom, which tokens/NFTs moved, the function called, success/failure and fee — plus the structured decoded data.
```

### `find_defi_yields`

- The name "find_defi_yields" says "find": a word for reading.
- Tag untrusted-input: The server marks it openWorldHint: true: it reaches things outside the server's own data.

Description, as the server wrote it:

```untrusted-server-text
Paid: $0.05 USDC per successful call via x402 (not charged on errors). Top DeFi yields across 16k+ pools, filtered by asset, chain, minimum TVL and risk, each with a simple explained risk tier (outlier APY, thin TVL, reward-heavy, IL exposure). Data: DefiLlama.
```

### `list_services`

- The name "list_services" says "list": a word for reading.

Description, as the server wrote it:

```untrusted-server-text
Free. Lists every Checkpoint402 data service with its price, inputs, example output link and how payment works.
```

## Claude Code permissions

For `.claude/settings.json`, assuming the server is installed as `checkpoint402`:

```json
{
  "permissions": {
    "allow": [
      "mcp__checkpoint402__list_services",
      "mcp__checkpoint402__explain_transaction",
      "mcp__checkpoint402__find_defi_yields"
    ],
    "ask": [
      "mcp__checkpoint402__new_token_safety_feed",
      "mcp__checkpoint402__sec_8k_company_events",
      "mcp__checkpoint402__ofac_sanctions_screen"
    ],
    "deny": []
  }
}
```

Capability tags behind the rules (a read tagged outbound is asked about):

- `mcp__checkpoint402__explain_transaction`: untrusted-input
- `mcp__checkpoint402__find_defi_yields`: untrusted-input
- `mcp__checkpoint402__new_token_safety_feed`: untrusted-input
- `mcp__checkpoint402__sec_8k_company_events`: untrusted-input
- `mcp__checkpoint402__ofac_sanctions_screen`: untrusted-input