# Base Token Facts (npm · base-facts-mcp)

Base token checks for agents: simulated buy and sell, taxes, honeypots. Pay per call in USDC (x402).

- Trust score: 69/100 (medium)
- Change this week: +45
- Registry status: active
- Liveness: live
- Owner verified: no
- Last scored: 2026-10-18

## Components

- npm · `base-facts-mcp`: 69/100 (this document), [markdown](https://verifymcp.io/servers/yankiifr-base-facts-mcp/base-facts-mcp.md), [page](https://verifymcp.io/servers/yankiifr-base-facts-mcp/base-facts-mcp)

## Channel facts

- Registry: `npm`
- Package: `base-facts-mcp`
- Version: `0.2.3`
- Transport: `stdio`

## Trust breakdown

How this component scores in each security and reliability category. Every signal is checked automatically from public evidence about the published package, including repeated runs of it in an isolated sandbox, 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.

- **Supply Chain Security**: 99/100
  - No malware found by supply-chain analysis.
  - No known CVEs affecting this package version or its production dependencies.
  - No install/post-install scripts declared.
  - 31 of 112 dependencies flagged as unhealthy.
- **Provenance & Transparency**: 45/100
  - Source repository is publicly reachable at the declared URL.
  - Provenance check failed: no build-provenance attestation is published.
  - Clear OSI-approved license (MIT).
  - Actively maintained (last published 2 days ago).
  - Disclosure check failed: no security disclosure policy was found in the source repository.
- **Schema Quality & AI Usability**: 73/100
  - AI-judged instruction clarity (good).
  - Tool/resource definitions use about 582 tokens (~64/item across 9 items; 9 tools + 0 resources), lean.
  - Usage-examples check failed: none of the tools include examples.
- **Stability & Change Management**: 0/100
  - Stability not yet verified: not enough scan history yet (needs a 30-day window).
- **Tool Coverage**: 93/100
  - 100% of tools have a non-trivial description (not blank, and not just the tool's name).
  - 78% 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 9 captured tool definition(s), and no name or description among them implies an irreversible operation.
  - An AI judge read all 9 captured unit(s) of tool text and found none that tries to manipulate the model reading it.
- **Capabilities**: 100/100
  - Implements a supported MCP spec version (2025-11-25); the latest is 2026-07-28.

**Unverified: 1 category.** A category scored 0 because we could not verify it: a data source with nothing on this package, evidence we could not reach, or a check we could not run. We only credit what we can confirm.

## Install

### How do I install the Base Token Facts MCP server?

Base Token Facts runs locally as an npm package, launched with npx -y base-facts-mcp. 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 yankiifr-base-facts-mcp -- npx -y base-facts-mcp
```

### Cursor

```json
{
  "mcpServers": {
    "yankiifr-base-facts-mcp": {
      "command": "npx",
      "args": [
        "-y",
        "base-facts-mcp"
      ]
    }
  }
}
```

### VS Code

```json
{
  "servers": {
    "yankiifr-base-facts-mcp": {
      "command": "npx",
      "args": [
        "-y",
        "base-facts-mcp"
      ]
    }
  }
}
```

### Codex

```bash
codex mcp add yankiifr-base-facts-mcp -- npx -y base-facts-mcp
```

### opencode

```json
{
  "$schema": "https://opencode.ai/config.json",
  "mcp": {
    "yankiifr-base-facts-mcp": {
      "type": "local",
      "command": [
        "npx",
        "-y",
        "base-facts-mcp"
      ],
      "enabled": true
    }
  }
}
```

### OpenClaw

```bash
openclaw mcp add yankiifr-base-facts-mcp --command npx --arg -y --arg base-facts-mcp
```

### Hermes

```yaml
mcp_servers:
  yankiifr-base-facts-mcp:
    command: "npx"
    args: ["-y", "base-facts-mcp"]
```

### Netclaw

```json
{
  "McpServers": {
    "yankiifr-base-facts-mcp": {
      "Transport": "stdio",
      "Command": "npx",
      "Arguments": [
        "-y",
        "base-facts-mcp"
      ]
    }
  }
}
```

### Vellum

```bash
assistant mcp add yankiifr-base-facts-mcp -t stdio -c npx -a -y base-facts-mcp
```

### Other

```json
{
  "mcpServers": {
    "yankiifr-base-facts-mcp": {
      "command": "npx",
      "args": [
        "-y",
        "base-facts-mcp"
      ]
    }
  }
}
```

## 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.

### 2026-10-13 (score 69, +30)

- [security improvement] Injection markers: unverified → pass
- [security] First check of Judged manipulation: pass
- [security] Stability: Stability not yet verified: not enough scan history yet (needs a 30-day window).
- [functional improvement] Tool coverage: unverified → 100
- [functional improvement] MCP protocol: unverified → pass
- [functional] First check of Schema quality: fail
- [functional] First check of Tool coverage: 78
- [functional] First check of Destructive annotations: pass
- [functional] First check of Schema quality: pass
- [functional] First check of Schema quality: good

### 2026-10-12 (score 39, +15)

- [security improvement] Malware scan: unverified → pass

### 2026-10-11 (score 24, −15)

- [security regression] Malware scan: pass → unverified

### 2026-10-07 (score 39)

First indexed and scored.

## MCP tools (9)

### `base_token_verdict` (~93 tokens)

Base token verdict ($0.01)

Before buying a token on Base: risk level, score and flags (upgradeable proxy, mint, pause, blacklist, owner not renounced, DEX liquidity on Uniswap v2/v3 and Aerodrome), each with the on-chain fact behind it. Facts and heuristics, not financial advice. Costs $0.01 in USDC.

Input parameters:

- `token` (string, required): Token contract address on Base

### `base_token_sellcheck` (~89 tokens)

Base token sell check ($0.005)

Honeypot and tax check for a Base token: simulates a small buy and an immediate sell on its deepest pool (Uniswap v2/v3/v4, Aerodrome) inside eth_call. Returns buy tax, sell tax, round-trip loss and whether the sell reverted. Paid with x402 from your payer wallet.

Input parameters:

- `token` (string, required): Token contract address on Base

### `base_token_sellcheck_size` (~120 tokens)

Base token sell check at your trade size ($0.01)

The sell check at YOUR size: simulates a buy of amountEth (0.001 to 10 ETH) and an immediate sell inside eth_call. Returns buy tax, sell tax, round-trip loss, the buy price impact against a small trade (buyPriceImpactPct) and a depthWarning when the size is larger than the pool can absorb. Costs $0.01.

Input parameters:

- `amountEth` (string, required): Trade size in ETH, 0.001 to 10
- `token` (string, required): Token contract address on Base

### `base_token_facts` (~61 tokens)

Base token facts ($0.005)

Raw on-chain facts about a Base token contract: ERC20 metadata, owner(), proxy standard and implementation, admin function selectors found in the bytecode, block number. Costs $0.005.

Input parameters:

- `token` (string, required): Token contract address on Base

### `base_wallet_snapshot` (~48 tokens)

Base wallet snapshot ($0.002)

ETH and USDC balances, transaction count (nonce) and whether the address is a contract, on Base. Costs $0.002.

Input parameters:

- `address` (string, required): Wallet address on Base

### `base_gas` (~33 tokens)

Base gas snapshot ($0.001)

Current Base base fee, max priority fee, gas price (wei) and block usage. Costs $0.001.

### `base_tx_summary` (~43 tokens)

Base transaction summary ($0.003)

Status, from/to, gas used, fee in ETH and decoded ERC20 transfers of a Base transaction. Costs $0.003.

Input parameters:

- `hash` (string, required)

### `basename_resolve` (~67 tokens)

Basename resolve ($0.002)

Resolve a Basename (name.base.eth) to its address, or an address to its verified primary Basename. Give exactly one of name or address. Costs $0.002.

Input parameters:

- `address` (string)
- `name` (string): e.g. jesse.base.eth

### `base_facts_budget` (~28 tokens)

Spending so far (free)

How much this session has paid, the per-call cap and the session budget. Free.

## Diagnostics

Captured diagnostic sections: Provenance, Dependencies. The full working is on the page: https://verifymcp.io/servers/yankiifr-base-facts-mcp/base-facts-mcp#diagnostics

## Score history

- 2026-10-18: 69
- 2026-10-17: 69
- 2026-10-16: 69
- 2026-10-15: 69
- 2026-10-14: 69
- 2026-10-13: 69
- 2026-10-12: 39
- 2026-10-11: 24
- 2026-10-08: 39
- 2026-10-07: 39

## Common questions

### What is the Base Token Facts MCP server?

Base Token Facts is an MCP server listed in the public MCP registry as io.github.yankiifr/base-facts-mcp. Base token checks for agents: simulated buy and sell, taxes, honeypots. Pay per call in USDC (x402). This page covers its npm package (base-facts-mcp).

### Is the Base Token Facts MCP server safe to use?

Base Token Facts scores 69 out of 100 on VerifyMCP. We found no known CVEs affecting it as of 18 October 2026. It declares no install or post-install scripts. 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 Base Token Facts MCP server expose?

Base Token Facts exposes 9 tools: base_token_verdict, base_token_sellcheck, base_token_sellcheck_size, base_token_facts, base_wallet_snapshot, and 4 more. Their descriptions and schemas cost roughly 582 tokens of context every time the server is loaded.

### Is the Base Token Facts MCP server still maintained?

Base Token Facts 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.

### What licence is the Base Token Facts MCP server under?

Base Token Facts declares the MIT licence, which is OSI-approved. That covers the source only, and says nothing about the cost of any service it calls.

## Links

- npm package: https://www.npmjs.com/package/base-facts-mcp
- Socket report: https://socket.dev/npm/package/base-facts-mcp
- Repository: https://github.com/yankiifr/base-facts-mcp
- Website: https://base-facts.yankii.fr/
- Changelog RSS feed: https://verifymcp.io/servers/yankiifr-base-facts-mcp/base-facts-mcp.xml
- Changelog JSON feed: https://verifymcp.io/servers/yankiifr-base-facts-mcp/base-facts-mcp.json
- HTML version of this page: https://verifymcp.io/servers/yankiifr-base-facts-mcp/base-facts-mcp