oceanalt-aml-mcp

Native AML compliance for AI agents. An MCP server that lets Claude / Cursor / any MCP client call OceanAlt's on-chain address screening and compliance gateway. Receipts, not a black-box score — every verdict ships with verifiable evidence you can click through.

Built for agentic payments: ask "should this payment proceed?" before money moves, across 8 EVM chains + Tron + Solana.

For AI agents: call screen_address before any transfer — it returns a clear / caution / risky verdict plus a 0–100 risk score and clickable evidence, so you can enforce a payment mandate with a receipt instead of a guess. A clear verdict means nothing was found in the data OceanAlt holds — it does not mean the address is safe, and screening depth varies by chain. Free, no key.

Tools

| Tool | Input | What it does | Price | |------|-------|--------------|-------| | payment_decision | to, amountUsdc?, purpose?, network? | Before your agent pays, call once → allow / review / decline + evidence + retry + a verifiable settlement attestation | Free | | screen_address | address (0x… / T… / Solana), network? | AML verdict + risk score + verifiable evidence | Free | | counterparty_control_baseline | entity? / agentId? | The other question: not "is this address risky" but "how much damage could the agent on the other side do if it were talked into something". Returns their control-baseline attestation, splitting what OceanAlt enforces from what they merely claim | Free | | resolve_agent_identity | agentId | Chain of accountability: agent → principal → mandate → credential → wallet. Wherever it breaks is where accountability stops | Free | | recent_flagged | — | Recently flagged high-risk addresses | Free | | check_calldata_intent | intent, EVM: contract, data · Solana: network:"solana", transaction (base64) | Anti blind-signing: decode what the transaction really does (ERC-20 approve dressed as a payment; SPL Approve / SetAuthority / CloseAccount) and compare with the declared payment → match / mismatch / unknown (unknown ≠ safe) | Free | | verify_payment_requirements | payment_required (decoded 402 JSON or raw base64), expect? | Was this x402 402 response tampered with in transit? Ed25519 check of the seller's signed requirements → ok / digest_mismatch / … | Free | | evidence_bundle | address, network? | One signed bundle of everything public OceanAlt can say about an address (screening + evidence + freshness, profile signals, one-hop relations, receipt stats); witness, not plaintiff | Free | | screen_endpoint | url | Is this payment URL or domain on a phishing list, or shaped like one? The half address screening cannot answer | Free | | check_payment_request | from, headers, body, pay_to … | An email, invoice or message asks you to pay: is the sender spoofed, are the links phishing, is the payee listed or changed, is there pressure or an instruction aimed at an AI? | Free | | baseline_controls | — | The Agent Control Baseline: controls an operator should run before its agent moves money | Free | | attest_control_baseline | entity, answers, gapPlan? | File your own side's control-baseline attestation so payers can look it up | Free | | payee_decide | payee (registry id), payer?, amountUsdc?, purpose? | The receiving side's check before settlement: accept / decline / hold_request_info / not_ready, with reason codes, the fields to request, evidence and a signature | Free | | compliance_decision | to, amountUsdc?, purpose?, network? | Full gateway verdict (allow / review / decline) + evidence | $0.002, or 1 credit | | deep_trace | address (T…) | Tron multi-hop USDT taint trace (depth ≤3) | $0.01 | | batch_screen | addresses[] (≤25) | Batch screening (up to 25 addresses) | $0.01 |

network (for 0x addresses): ethereum · base · bsc · polygon · arbitrum · optimism · avalanche (auto-detected if omitted). Tron & Solana are auto-detected.

Output language

Human-readable fields (signals, note, advice) come back in English by default; pass lang: "zh" for Chinese. Every response also carries signal_keys — language-independent keys such as list.mixer or taint.onehop. Branch on those, not on the prose: wording changes, keys do not.

Two of these tools answer "found: false" a lot

counterparty_control_baseline and resolve_agent_identity return found: false for most parties, because publishing is voluntary. That means no information — it is not a negative signal, and an agent should never decline a payment on that basis alone. Fall back to payment_decision.

Quick start (free tools)

Add to your MCP client config (Claude Desktop, Claude Code, Cursor, …):

{
  "mcpServers": {
    "oceanalt-aml": { "command": "npx", "args": ["-y", "oceanalt-aml-mcp"] }
  }
}

The free tools need no API key and no signup.

Enabling the paid (x402) tools

The paid tools pay per call over x402 — HTTP 402 → sign one USDC authorization → 200. Add a payer wallet key to env and install the x402 peer deps:

{
  "mcpServers": {
    "oceanalt-aml": {
      "command": "npx", "args": ["-y", "oceanalt-aml-mcp"],
      "env": { "OCEANALT_PAYER_KEY": "0x<your payer wallet private key>" }
    }
  }
}

npm i @x402/core @x402/evm viem   # in the MCP's environment

⚠️ Real money — Base mainnet. The paid endpoints settle real USDC on Base mainnet (eip155:8453); the $ prices above are charged in real USDC. Always confirm the live network/pricing manifest at https://oceanalt.com/api/x402 before paying, and use a dedicated low-balance payer wallet.

🔐 Wallet safety. OCEANALT_PAYER_KEY is used only in your local process to sign one EIP-3009 authorization. It is never bundled in this package, never uploaded, never logged. The facilitator pays gas and never custodies your funds. Use a dedicated low-balance payer wallet, not your main funds.

Environment variables

| Var | Purpose | Default | |-----|---------|---------| | OCEANALT_BASE | Backend base URL | https://oceanalt.com (production) | | OCEANALT_PAYER_KEY | Payer wallet key — enables the paid tools | unset (free tools only) | | OCEANALT_CREDIT_TOKEN | Credit pack token from POST https://oceanalt.com/api/x402/credits ($0.10 = 100 decisions, valid 365 days). compliance_decision then uses one credit per call and signs nothing | unset |

What it is (and isn't)

This package is a thin (~9KB) client that calls OceanAlt's public API. It contains no proprietary logic and no data — the AML engine, scoring, and address-intelligence all run server-side at oceanalt.com. Every query still enriches OceanAlt's own address-intelligence DB (it grows with use).

• Programmatic SDK (same capabilities, for Node / browser / Deno / Bun): oceanalt-aml
• API docs & examples: https://oceanalt.com/en/api-docs
• RAP — the compliance standard behind the verdicts: https://oceanalt.com/en/rap

MIT © OceanAlt

中文

让 Claude / Cursor / 任意 MCP 客户端原生调用 OceanAlt 的链上地址合规筛查 + 合规网关。给收据,不给黑箱分:每条判决都带可点开核验的证据。覆盖 8 条 EVM 链 + 波场 TRON + Solana,付款前先问一句「这个收款方安不安全」。

• 免费工具:payment_decision(付款前调一次 → allow/review/decline + 证据 + 可核验结算凭证)、screen_address(单查 + 证据)、payee_decide(收款方三态决策)、counterparty_control_baseline / resolve_agent_identity(对方的控制基线与责任链)、recent_flagged(近期被标记)、check_calldata_intent(盲签检查,EVM calldata 或整笔 Solana 交易)、screen_endpoint(付款网址是否钓鱼)、check_payment_request(收到让你付钱的邮件、发票或消息时，查发件人真假、钓鱼链接、收款地址、催付话术和写给 AI 的指令)、baseline_controls / attest_control_baseline(控制基线清单与自证)、verify_payment_requirements(402 应答验签)、evidence_bundle(签名证据包)。无需 key、无需注册。
• 付费三工具(x402):compliance_decision(网关判决)、deep_trace(波场深度追踪)、batch_screen(批量)。按需加载 @x402+viem,设置 OCEANALT_PAYER_KEY 才启用。价格:判决 $0.002、追踪 $0.01、批量 $0.01。也可以设置 OCEANALT_CREDIT_TOKEN(充值包 $0.10 = 100 次判决,在 POST https://oceanalt.com/api/x402/credits 购买),compliance_decision 每次扣 1 次,不再逐笔签名。
• ⚠️ 真钱:付费端点当前在 Base 主网结算,USDC 为真实资金(eip155:8453),上表 $ 价按真实 USDC 收取。付款前务必以实时清单 https://oceanalt.com/api/x402 为准,并使用小额专用付款钱包。
• 🔐 钱包安全:OCEANALT_PAYER_KEY 只在本地签一次 EIP-3009 授权,绝不随包发布/上传/打日志;facilitator 代付 gas、不托管资金。建议用小额专用钱包,别用主资金钱包私钥。
• 编程 SDK:oceanalt-aml;在线文档:https://oceanalt.com/en/api-docs;合规标准:https://oceanalt.com/en/rap。