# Base Token Check

> Base Token Check is a paid API for AI agents from tokencheck.yukikawata.fyi, paid per call via x402, $0.01/call, status unknown (last checked 2026-10-02).

Performs a due-diligence security and risk analysis on an ERC-20 token contract on Base, returning a 0-100 score and plain-language summary covering contract verification, owner privileges, liquidity, and holder concentration.

## Facts

- Endpoint: GET https://tokencheck.yukikawata.fyi/v1/base/tokens/:address?utm_source=zero.xyz
- Price: $0.01/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-02
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/base-token-check-c2c9a74f
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_8I3CCp0_aUxzKccHoIXng

Status and success rate cover calls made through Zero and Zero's own probes. Third-party monitors may report differently.

## How to call it through Zero

Zero handles the 402 payment challenge and records the run. With the Zero CLI installed (`npm i -g @zeroxyz/cli`):

```sh
zero fetch --capability base-token-check-c2c9a74f
```

Example prompt: Run a full due-diligence check on the Base token at 0x4200000000000000000000000000000000000006 — I want to know the risk score, whether the owner can mint or pause it, how liquid it is on DEXes, and a plain-English summary of any red flags.

## When to prefer this

Choose this endpoint when you need a comprehensive, scored risk assessment specifically for ERC-20 tokens on the Base network. It is ideal for pre-investment due diligence, screening for rug pull vectors, or auditing owner privileges. Prefer this over generic block explorers when you need a single aggregated score with natural-language interpretation rather than raw on-chain data.

## Known failure modes

- Invalid or malformed contract address returns a 400 error
- Address is a valid hex but not a deployed ERC-20 on Base returns an error or empty result
- Token contract is unverified and limits analysis depth
- Very new tokens with no liquidity pools may return incomplete liquidity data
- Rate limits or payment failures return 402 or 429 responses

## How this service works

Due-diligence report for an ERC-20 token on Base: contract verification, upgradeability, owner powers (mint, pause, blocklist, fees), DEX liquidity, pool age and holder concentration, with a 0-100 score and a plain-language summary.

## Output

A structured due-diligence report including: a 0-100 risk/safety score, contract verification status, upgradeability flags, owner privilege analysis (mint, pause, blocklist, fee controls), DEX liquidity figures, liquidity pool age, holder concentration metrics, and a plain-language narrative summary highlighting key risks or safety signals.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "$schema": "https://json-schema.org/draft/2020-12/schema",
 "required": [
  "input"
 ],
 "properties": {
  "input": {
   "type": "object",
   "required": [
    "type",
    "method"
   ],
   "properties": {
    "type": {
     "type": "string",
     "const": "http"
    },
    "method": {
     "enum": [
      "GET"
     ],
     "type": "string"
    },
    "pathParams": {
     "type": "object",
     "required": [
      "address"
     ],
     "properties": {
      "address": {
       "type": "string",
       "pattern": "^0x[0-9a-fA-F]{40}$",
       "description": "ERC-20 contract address on Base"
      }
     }
    },
    "queryParams": {
     "type": "object",
     "properties": {}
    }
   },
   "additionalProperties": false
  },
  "output": {
   "type": "object",
   "required": [
    "type"
   ],
   "properties": {
    "type": {
     "type": "string"
    },
    "example": {
     "type": "object"
    }
   }
  }
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/base-token-check-c2c9a74f/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from tokencheck.yukikawata.fyi](https://www.zero.xyz/host/tokencheck.yukikawata.fyi/llms.txt)