# Base Large Transfer Radar

> Base Large Transfer Radar is a paid API for AI agents from xx402.icu, paid per call via x402, $0.01/call, status unknown (last checked 2026-09-15).

Scans recent Base blockchain blocks for large ERC20 token transfers above a USD threshold, returning transfer events, risk flags, and review queues for specified tokens.

## Facts

- Endpoint: GET https://xx402.icu/x402/api/base-large-transfer-radar
- Price: $0.01/call
- Payment: x402
- Status: unknown
- Last checked: 2026-09-15
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/base-large-transfer-radar-343edaff
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_M3R-CmTMFkZc8IP8muxsa

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-large-transfer-radar-343edaff
```

Example prompt: Show me all large transfers on Base over the last 300 blocks worth at least $100,000 for USDC (0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) and WETH (0x4200000000000000000000000000000000000006), and return up to 12 results with any risk flags.

## When to prefer this

Use this endpoint when you need real-time detection of large on-chain token movements on the Base network, particularly for risk monitoring, whale tracking, or DeFi due diligence. It is purpose-built for Base ERC20 transfer scanning with configurable USD thresholds and block windows, making it more targeted than generic blockchain explorers. Prefer this over general block explorers when you need pre-ranked risk review queues and risk flags alongside raw transfer data.

## Known failure modes

- Invalid or non-Base token address returns empty results or error
- min_usd set above all observed transfers yields empty large_transfers array
- window_blocks out of range (below 100 or above 3000) returns validation error
- No price data available for token results in transfers missing USD estimates
- Rate limit or payment failure (x402) returns 402 Payment Required
- Token address not an ERC20 on Base returns no transfer logs

## How this service works

Paid x402 buyer market scout, x402 paid resource preflight, x402 seller visibility audit, Base actionable risk feed, liquidity exit risk alerts, pool launch risk feed, stable asset risk feed, contract control event feed, protocol outflow risk feed, yield pool allocation risk feed, protocol fee quality feed, token watchlist decision packet, wallet watchlist decision packet, approval risk feed, ranked DeFi review queues with incident history, onchain risk decision packet, promoted token campaign decision packet, large transfer decision packet, token candidate screening decision radar, DEX pair anomaly decision radar, wallet safety decision packet, counterparty flow, allowance, approval exposure, DEX pair routing risk, token trade safety, token liquidity, token flow, holder concentration, contract controls, batch token screening decision packets, token diligence, and BTC15 prediction-market microstructure, execution-friction, calibration-slice, recent market tape, resolved feature sample, and threshold-pressure packets for agents and risk tools.

## Output

Returns a JSON object with keys: summary (overall scan summary), token_summaries (per-token stats), large_transfers (list of qualifying transfer events above the USD threshold), review_queue (ranked items flagged for review), risk_flags (detected risk signals), source_status (data source health), and sources (data provenance). Each transfer includes token address, amount, USD value estimate, sender/receiver, block number, and risk metadata.

## Response schema (JSON Schema)

```json
{
 "keys": [
  "summary",
  "large_transfer_decision",
  "priority_queue",
  "risk_breakdown",
  "token_summaries",
  "large_transfers",
  "review_queue",
  "avoid_queue",
  "bucket_counts",
  "risk_flags",
  "source_status",
  "sources"
 ],
 "type": "json"
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/base-large-transfer-radar-343edaff/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from xx402.icu](https://www.zero.xyz/host/xx402.icu/llms.txt)