# Mint Intel: ERC-20 Allowance on Base

> Mint Intel: ERC-20 Allowance on Base is a paid API for AI agents from mintintel.35-171-220-195.sslip.io, paid per call via x402, $0.001/call, status unknown (last checked 2026-10-31).

Returns the decimal-adjusted ERC-20 token allowance a spender is permitted to move from an owner's wallet on the Base blockchain, including an unlimited-approval flag and known-spender label.

## Facts

- Endpoint: GET https://mintintel.35-171-220-195.sslip.io/v1/base/allowance/:token/:owner/:spender?utm_source=zero.xyz
- Price: $0.001/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-31
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/mint-intel-erc-20-allowance-on-base-4a5a83ef
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_bMR67Qh1IWjOUmhdTbL7f

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 mint-intel-erc-20-allowance-on-base-4a5a83ef
```

Example prompt: Can you check how much USDC (0xd9aAEc86B65D86f6A7B5B1b0c42FFA531710b6CA) the Permit2 contract (0x000000000022D473030F116dDEE9F6B43aC78BA3) is allowed to spend from my Base wallet 0xAbCd1234...EfGh?

## When to prefer this

Use this endpoint when you specifically need ERC-20 allowance data on the Base blockchain (not Ethereum mainnet or Solana). It is ideal for DeFi agents auditing token approvals, pre-trade safety checks, wallet security reviews, and detecting unlimited approvals to known spenders like Permit2 or DEX routers. Prefer it over a generic RPC call because it returns decimal-adjusted values, the unlimited flag, and named-spender labels in a single response without any local ABI decoding.

## Known failure modes

- Invalid or non-checksummed address returns a 400 error
- Token address is not a valid ERC-20 contract on Base — call reverts or returns zero
- Unknown spender address returns no label (blank or null label field)
- Base RPC node temporarily unavailable — 503 or timeout
- Owner has no allowance set for the spender — returns zero allowance and unlimited: false

## How this service works

ERC-20 allowance on Base via allowance(owner, spender) (eth_call) - how much a spender such as Permit2 or a DEX router may move from an owner's wallet, decimal-adjusted, with unlimited-approval flag and known-spender label.

## Output

Returns the token contract address, the raw allowance as a big-integer string, a decimal-adjusted human-readable allowance value, a boolean unlimited flag (true when approval equals uint256 max), and a label identifying the spender if it is a known protocol such as Permit2 or a DEX router.

## 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": [
      "token",
      "owner",
      "spender"
     ],
     "properties": {
      "owner": {
       "type": "string",
       "description": "0x-prefixed 20-byte EVM address"
      },
      "token": {
       "type": "string",
       "description": "0x ERC-20 token contract address"
      },
      "spender": {
       "type": "string",
       "description": "0x-prefixed 20-byte EVM address"
      }
     },
     "additionalProperties": false
    },
    "queryParams": {
     "type": "object",
     "properties": {},
     "additionalProperties": false
    }
   },
   "additionalProperties": false
  },
  "output": {
   "type": "object",
   "required": [
    "type"
   ],
   "properties": {
    "type": {
     "type": "string"
    },
    "example": {
     "type": "object",
     "required": [
      "token",
      "allowanceRaw",
      "unlimited"
     ],
     "properties": {
      "token": {
       "type": "string"
      },
      "unlimited": {
       "type": "boolean"
      },
      "allowanceRaw": {
       "type": "string"
      }
     }
    }
   }
  }
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/mint-intel-erc-20-allowance-on-base-4a5a83ef/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from mintintel.35-171-220-195.sslip.io](https://www.zero.xyz/host/mintintel.35-171-220-195.sslip.io/llms.txt)