# A2A Token Safety Verifier (Base L2)

> A2A Token Safety Verifier (Base L2) is a paid API for AI agents from a2a-verifier-production.up.railway.app, paid per call via x402, $0.05/call, status unknown (last checked 2026-09-14).

Simulates buy/sell transactions, checks for honeypots, analyzes transfer taxes, resolves proxies, and measures liquidity for ERC-20 tokens on Base L2.

## Facts

- Endpoint: GET https://a2a-verifier-production.up.railway.app/verify
- Price: $0.05/call
- Payment: x402
- Status: unknown
- Last checked: 2026-09-14
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/a2a-token-safety-verifier-base-l2-eead9d69
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_dASiYehRg0GaoTxHqqYKM

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 a2a-token-safety-verifier-base-l2-eead9d69
```

Example prompt: Before I buy this token, can you run a full safety check on it — simulate buy and sell, check for honeypot behavior, look at transfer taxes and liquidity — the contract address on Base is 0x4200000000000000000000000000000000000006.

## When to prefer this

Use this endpoint when you need a quick, automated safety assessment of an ERC-20 token specifically on the Base L2 network before executing a trade or recommending a token to a user. It is distinct from general Ethereum mainnet scanners and combines buy/sell simulation, honeypot detection, tax analysis, proxy resolution, and liquidity checks in a single call — ideal for DeFi agents that need a holistic risk verdict without calling multiple separate APIs.

## Known failure modes

- Invalid or malformed token address (not a 0x 40-hex-char address) returns a validation error
- Token address not deployed on Base L2 returns a contract-not-found error
- RPC or simulation timeout may return incomplete results
- Unverified or heavily obfuscated contracts may yield limited analysis
- Payment not received (x402) results in 402 Payment Required response

## How this service works

Base L2 EVM token safety verifier: simulates buy/sell, transfer taxes, honeypot checks, proxy resolution, and liquidity. Pass ?token=<Base ERC-20 address>.

## Output

Returns a structured JSON object containing: token address and chain, simulation results (buy/sell success, amounts in/out), contract analysis (proxy status, ownership, flags), liquidity metrics (pool depth, reserves), and a plain-language recommendation summarizing overall safety.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "$schema": "https://json-schema.org/draft/2020-12/schema",
 "required": [
  "input"
 ],
 "properties": {
  "input": {
   "type": "object",
   "required": [
    "type",
    "method"
   ],
   "properties": {
    "type": {
     "type": "string",
     "const": "http"
    },
    "method": {
     "enum": [
      "GET",
      "HEAD",
      "DELETE"
     ],
     "type": "string"
    },
    "queryParams": {
     "type": "object",
     "required": [
      "token"
     ],
     "properties": {
      "token": {
       "type": "string",
       "pattern": "^0x[0-9a-fA-F]{40}$",
       "description": "Base L2 ERC-20 token contract address (0x...)"
      }
     }
    }
   },
   "additionalProperties": false
  },
  "output": {
   "type": "object",
   "required": [
    "type"
   ],
   "properties": {
    "type": {
     "type": "string"
    },
    "example": {
     "type": "object",
     "required": [
      "token",
      "simulation_results",
      "contract_analysis",
      "liquidity_metrics",
      "recommendation"
     ],
     "properties": {
      "chain": {
       "type": "string"
      },
      "token": {
       "type": "string"
      },
      "recommendation": {
       "type": "string"
      },
      "schema_version": {
       "type": "string"
      },
      "contract_analysis": {
       "type": "object"
      },
      "liquidity_metrics": {
       "type": "object"
      },
      "simulation_results": {
       "type": "object"
      }
     }
    }
   }
  }
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/a2a-token-safety-verifier-base-l2-eead9d69/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from a2a-verifier-production.up.railway.app](https://www.zero.xyz/host/a2a-verifier-production.up.railway.app/llms.txt)