# xx402 Base Address Risk Screening API

> xx402 Base Address Risk Screening API is a paid API for AI agents from x402.xx402.icu, paid per call via x402, $0.01/call, status down (last checked 2026-10-22).

Screens a Base/EVM wallet address for risk level, counterparty exposure, and trust signals by analyzing recent on-chain token transfers within a configurable block window.

## Facts

- Endpoint: GET https://x402.xx402.icu/api/base-address-risk?utm_source=zero.xyz
- Price: $0.01/call
- Payment: x402
- Status: down
- Last checked: 2026-10-22
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/xx402-base-address-risk-screening-api-012d0879
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_gVSNEAhfH9E5sM_M6T2GH

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 xx402-base-address-risk-screening-api-012d0879
```

Example prompt: Can you screen the Base wallet 0xba76c7ECa175f67cFcE475c09498f840176bf497 for risk — check its USDC transfer history over the last 3000 blocks and tell me whether it's safe to transact with?

## When to prefer this

Choose this endpoint when you need a structured, agent-ready risk assessment of a specific Base/EVM wallet address before transacting, routing payments, or onboarding a counterparty. It is particularly suited for autonomous agents that need a go/no-go decision with supporting evidence rather than raw chain data. Prefer it over generic block explorers when you need packaged risk flags, counterparty exposure analysis, and actionable trust plans in a single API call.

## Known failure modes

- Invalid address format (must match ^0x[a-fA-F0-9]{40}$) returns a validation error
- window_blocks out of range (must be 100–5000) returns a parameter error
- limit out of range (must be 1–20) returns a parameter error
- Payment not received via x402 protocol results in 402 Payment Required response
- Token address not a valid ERC20 on Base may return empty or null token data
- Network or RPC errors on Base chain may cause partial or failed data responses

## How this service works

Paid Base token, wallet, DeFi, chain-read, x402 buyer/seller discovery, and specialized Bitcoin 15-minute Up/Down prediction-market data packets for autonomous agents and risk tools.

## Output

Returns a rich JSON object including a risk_level classification, risk_flags list, risk_breakdown detail, counterparty_exposure summary, recent_transfers array, token_balance, account and token metadata, a screening_verdict, trust_go_no_go_checklist, address_trust_plan, counterparty_routing_ticket, buyer_execution_plan, and follow_up_purchase_urls — along with a not_financial_advice disclaimer.

## Response schema (JSON Schema)

```json
{
 "keys": [
  "summary",
  "purchase_acceptance",
  "buyer_next_action",
  "next_paid_call",
  "decision_evidence",
  "repeat_purchase_guard",
  "address_decision",
  "address_action_ticket",
  "address_result_summary",
  "follow_up_purchase_urls",
  "address_trust_ticket",
  "address_entity_profile",
  "counterparty_routing_ticket",
  "address_screening_verdict",
  "trust_go_no_go_checklist",
  "address_trust_plan",
  "counterparty_intake_plan",
  "buyer_execution_plan",
  "priority_queue",
  "best_next_products",
  "risk_breakdown",
  "review_queue",
  "avoid_queue",
  "screening_decision",
  "account",
  "token",
  "token_balance",
  "recent_transfers",
  "counterparty_exposure",
  "counterparty_review_queue",
  "bucket_counts",
  "risk_flags",
  "risk_level",
  "source_status",
  "sources",
  "not_financial_advice"
 ],
 "type": "json"
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/xx402-base-address-risk-screening-api-012d0879/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from x402.xx402.icu](https://www.zero.xyz/host/x402.xx402.icu/llms.txt)