Api Endpoint

Base Transfer Risk

Check a Base ERC-20 for a honeypot-style transfer cost before a swap or send. Input: one token address. Output: allow, warn, or block. Block: not a contract or not an ERC-20. Warn: bytecode contains taxFee, liquidityFee, sellFee, buyFee, transferFee, isBlacklisted, or maxTxAmount. USDC warns because it contains isBlacklisted(address). A selector does not prove the fee, blacklist, or cap runs on every transfer, and this check does not simulate one.

Open interactive test console

Offering

Provider: base-token-check.fly.dev
Method: GET
Offering type: Api Endpoint
Transport type: http
Category: Security
Delivery: Not provided
Pricing model: Not provided
x402 version: 2

Endpoint context

URL: https://base-token-check.fly.dev/v1/transfer-check
MIME type: application/json
First seen: 2026-10-16T01:50:32.458Z
Last seen: 2026-11-04T19:54:49.030Z
Tags: fee-on-transfer, blacklist, honeypot, tax, max-tx

Website

Payment pricing

x402 payment terms are the authoritative price for calling this endpoint.

Payment option 1: 0.01 USDC
Atomic price: 10000 · Network: eip155:8453 · Asset: USDC · Scheme: exact

Raw x402 terms

[
  {
    "scheme": "exact",
    "network": "eip155:8453",
    "asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
    "amount": "10000",
    "payTo": "0x540c2aA2526C9c8c2fb4632f0fED668C36424Cd5"
  }
]

Observed health

Status: Healthy
Latest latency: 17 ms
Average latency: 26 ms
HTTP status: 402
Last checked: 2026-11-04T19:54:49.025Z
Reachability: 100% over 15 checks

Latency is measured to the first response headers. A reachable result does not verify response accuracy or merchant identity.

Input schema

{
  "type": "object",
  "properties": {
    "type": {
      "type": "string",
      "const": "http"
    },
    "method": {
      "type": "string",
      "enum": [
        "GET",
        "HEAD",
        "DELETE"
      ]
    },
    "queryParams": {
      "type": "object",
      "properties": {
        "address": {
          "type": "string",
          "pattern": "^0x[0-9a-fA-F]{40}$",
          "description": "ERC-20 contract address on Base to check for a transfer fee, blacklist, or max transfer size."
        }
      },
      "required": [
        "address"
      ]
    }
  },
  "required": [
    "type",
    "method"
  ],
  "additionalProperties": false
}

Output schema

{
  "$schema": "https://json-schema.org/draft/2020-12/schema",
  "properties": {
    "input": {
      "additionalProperties": false,
      "properties": {
        "method": {
          "enum": [
            "GET",
            "HEAD",
            "DELETE"
          ],
          "type": "string"
        },
        "queryParams": {
          "properties": {
            "address": {
              "description": "ERC-20 contract address on Base to check for a transfer fee, blacklist, or max transfer size.",
              "pattern": "^0x[0-9a-fA-F]{40}$",
              "type": "string"
            }
          },
          "required": [
            "address"
          ],
          "type": "object"
        },
        "type": {
          "const": "http",
          "type": "string"
        }
      },
      "required": [
        "type",
        "method"
      ],
      "type": "object"
    },
    "output": {
      "properties": {
        "example": {
          "type": "object"
        },
        "type": {
          "type": "string"
        }
      },
      "required": [
        "type"
      ],
      "type": "object"
    }
  },
  "required": [
    "input"
  ],
  "type": "object"
}