# Base ERC-20 Allowance Scanner

> Base ERC-20 Allowance Scanner is a paid API for AI agents from geld-machen-x402.fly.dev, paid per call via x402, $0.02/call, status unknown (last checked 2026-09-14).

Scans a Base EVM address and returns all active ERC-20 token allowances, enabling users to identify potentially risky token approvals.

## Facts

- Endpoint: GET https://geld-machen-x402.fly.dev/product/base-allowance-scan.json
- Price: $0.02/call
- Payment: x402
- Status: unknown
- Last checked: 2026-09-14
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/base-erc-20-allowance-scanner-ee11e76a
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_PyA76g_m44988UnB2Flck

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-erc-20-allowance-scanner-ee11e76a
```

Example prompt: Can you scan my Base wallet 0x1234...abcd for all active ERC-20 allowances and tell me which contracts have permission to spend my tokens?

## When to prefer this

Choose this endpoint when you need to programmatically enumerate ERC-20 token allowances for a specific Base network wallet address, particularly for security audits, risk assessments, or pre-revocation reviews. Prefer it over manual block explorer lookups when automating wallet health checks or building DeFi safety workflows.

## Known failure modes

- Invalid or malformed EVM address returns an error response
- Address with no allowances returns an empty list
- Network connectivity issues to Base RPC may result in timeout or partial data
- Non-Base chain addresses (e.g. Ethereum mainnet) may return incorrect or empty results
- Rate limiting or payment failure returns 402 or 429 status

## How this service works

TIP-OF-SPEAR: URL Fingerprint ($0.01) GET ?url= → body_sha256/TLS/DNS. DEMAND-MATCHED SERP tip: Web Search ($0.02) GET ?q= (required) → ranked results. OCR tip: Image OCR ($0.01) GET ?url= → Tesseract text (COGS=0). Builder tool: Bazaar Readiness Check — FREE ?url= indexed yes/nein + issue count; PAID report $0.05 Fix-JSON. Gated-data: Base DeFi Snapshot ($0.03) balances+gas+protocol TVL/APY. Free teasers have no live hash/results. Upsell red-flag $0.25. Ladder: 0.01→0.02→0.025→0.25→0.35→0.49→0.75→17.

## Output

Returns a JSON object listing all active ERC-20 allowances associated with the provided Base address, including spender contract addresses, approved token amounts (including unlimited approvals), and potentially associated risk metadata.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "required": [
  "address"
 ],
 "properties": {
  "address": {
   "type": "string",
   "description": "Required Base EVM address to scan ERC-20 allowances"
  }
 }
}
```

## Response schema (JSON Schema)

```json
{}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/base-erc-20-allowance-scanner-ee11e76a/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from geld-machen-x402.fly.dev](https://www.zero.xyz/host/geld-machen-x402.fly.dev/llms.txt)