Is there a free crypto wallet risk check API?

Yes. This page's free check calls POST /free/v1/wallet_profile directly (no account, no key, rate-limited to 8 calls/IP/day, counterparties capped at 5) and the paid POST /v1/wallet_profile (no daily cap, up to 25 recent counterparties, USDC on Base via x402) uses the identical live builder.

Does this screen a wallet against OFAC sanctions?

Yes — every call checks the address against the same OFAC SDN published digital-currency address index used by this site's dedicated /v1/sanctions_screen route. A clear result means the address is not on OFAC's own published list; it is not a compliance certification, KYC verification, or AML program output.

What chain does this cover?

Base mainnet (eip155:8453) only. Balances cover a fixed 4-token watchlist (USDC, WETH, cbBTC, DAI) plus native ETH — not every token the address holds — and activity/counterparties are sourced from up to the 25 most recent transactions, not a full transaction history.

Is this a compliance or KYC tool?

No. This is an informational heuristic risk read (wallet age, transaction volume, contract-vs-EOA, known-label hits, and the OFAC check above) — not a certified compliance, KYC, or AML program output, and not a substitute for reading the chain directly for high-stakes decisions.

Guide + free tool · wallet risk data

Wallet Risk Check API (Base)

By draconic21 · Published 2026-09-28 · Sources: Base public RPC, Blockscout, OFAC SDN

Before you trust a Base wallet or contract address — as a counterparty, a grant recipient, or an incoming payment — check its on-chain activity, balances, and OFAC sanctions status in one call. Here's a free live check, then the paid API behind it.

Try it free — check a Base wallet address

Live, no signup. Reads Base's public RPC + Blockscout's explorer and screens against the OFAC SDN list.

Base address

What this is — and isn't

This route reads public Base blockchain infrastructure — Base's own JSON-RPC endpoint for native ETH balance, code, and nonce, and Blockscout's public Base explorer for token balances, transaction history, and recent counterparties — plus the same OFAC SDN digital-currency-address index this site's dedicated /v1/sanctions_screen route uses. Every field is either read live from those public sources or computed from them; nothing is a private data purchase.

It is not a compliance certification, a KYC verification, or an AML program output. A clear OFAC result means the address is not on OFAC's own published list at request time — it does not guarantee the address is unaffiliated with a sanctioned entity, and token balances only cover a fixed 4-token watchlist (USDC, WETH, cbBTC, DAI), not every asset the address holds. Read the caveats on every response.

Need more than 5 counterparties, a daily cap removed, or agent/API access?

Same feed, no cap

This free page calls the identical live builder used by the paid API — up to 25 recent counterparties, no daily cap.

Wallet profile with no daily cap — $0.025/call, USDC on Base, no account → Prefer card billing? Subscribe on the RapidAPI Web Intelligence API → MCP tools — call wallet_profile from any MCP-enabled agent →

Example (x402 pay-per-call)

curl -X POST https://draconic21-x402-api.onrender.com/v1/wallet_profile \
  -H "content-type: application/json" \
  -d '{"address":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913"}'
# unpaid: HTTP 402 + PAYMENT-REQUIRED header (sign with a Base USDC wallet, retry)

Agent / funded runtime? After you verify this feed, the cold-start buy on this origin is POST /v1/signal_latest — $0.03 USDC (Daily Agent Signal). Free wake: GET /health. Skill card: /skill.md · buyer loop: /agent-buy.md.

Independent public-data helper. This page and its linked API read public Base-chain infrastructure (Base RPC, Blockscout) and OFAC's own published SDN list — it is not affiliated with, endorsed by, or an official product of Base, Blockscout, Coinbase, or the U.S. Treasury. Not a compliance certification, KYC verification, AML program output, financial, or investment advice.