SafeBrowz Detection API

Drop-in agent skill

Building a Claude Agent, ChatGPT Custom GPT, Cursor rule, or any LLM-driven app? Paste our skill file into your agent's rules and it will know when and how to call the API.

Plugin manifest at /.well-known/ai-plugin.json

One price. No tiers.

Run the full x402 flow in your browser

Connect any wallet, paste a URL, click test. Pay 0.001 USDC on Solana or Base. Works with any SPL or EVM wallet. Solana wallet needs a small SOL balance for the network fee.

Pick a chain below - cost stays the same.

Need 0.001 USDC + a tiny bit of SOL for the network fee on Solana, or 0.001 USDC + ETH gas on Base. No refunds - payment is onchain.

Or curl it in 30 seconds

Every request requires an x402 payment. First call returns 402 with payment instructions. Pay, then retry with the transaction signature.

Step 1 - Get a 402 nonce

curl -s -X POST https://api.safebrowz.com/v1/detect \
  -H "Content-Type: application/json" \
  -d '{"url":"https://app.trezor-io.us.com/"}'

Response (402)

Pick any option inside payment or payment.alternatives. The primary entry is Solana USDC; alternatives include Solana SOL and Base USDC.

{
  "status": 402,
  "error": "payment_required",
  "payment": {
    "amount": "0.001",
    "token": "USDC",
    "token_mint": "EPjFWdd5AufqSSqeM2qN1xzybapC8G4wEGGkZwyTDt1v",
    "chain": "solana",
    "recipient": "FLQyppmJYbvQvEPAB4Mv8ZGmxkSXmXUwMACeJ79kdozW",
    "nonce": "ed548e77-719f-4f13-9f01-32dc8ed4e213",
    "memo_format": "safebrowz:ed548e77-719f-4f13-9f01-32dc8ed4e213",
    "alternatives": [
      { "token": "SOL",  "amount": "0.00001", "chain": "solana", "nonce_binding": "memo",   "memo_format": "safebrowz:..." },
      { "token": "USDC", "amount": "0.001",   "chain": "base",   "chain_id": 8453,
        "token_contract": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
        "recipient": "0xf3bc3a04646F1D721992AeDC07c98FC52FdFC358",
        "nonce_binding": "eip191",
        "sign_message": "safebrowz:ed548e77-719f-4f13-9f01-32dc8ed4e213" }
    ]
  }
}

Step 2a - Pay on Solana

Transfer 0.001 USDC (or 0.00001 SOL) to the recipient with memo safebrowz:<nonce>. Any Solana wallet or the spl-token CLI works. Nonces expire in 10 minutes.

spl-token transfer EPjFWdd5AufqSSqeM2qN1xzybapC8G4wEGGkZwyTDt1v 0.001 \
  FLQyppmJYbvQvEPAB4Mv8ZGmxkSXmXUwMACeJ79kdozW \
  --fund-recipient \
  --with-memo "safebrowz:ed548e77-719f-4f13-9f01-32dc8ed4e213"

Step 2b - Pay on Base (EVM wallets)

Send a standard USDC ERC-20 transfer on Base to the recipient, then sign the nonce message off-chain. Base lacks a native memo field, so nonce binding uses EIP-191 personal_sign of safebrowz:<nonce>. The signature must recover to the wallet that paid.

// viem / ethers pseudocode
const txHash = await wallet.writeContract({
  address: "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913", // USDC on Base
  abi: erc20Abi, functionName: "transfer",
  args: [ "0xf3bc3a04646F1D721992AeDC07c98FC52FdFC358", 1000n ], // 0.001 USDC (6 dec)
});
const walletSig = await wallet.signMessage({
  message: "safebrowz:ed548e77-719f-4f13-9f01-32dc8ed4e213",
});

Step 3 - Retry with the proof

For Solana, send the tx signature only. For Base, also send the EIP-191 wallet signature and set X-402-Chain: base.

# Solana
curl -s -X POST https://api.safebrowz.com/v1/detect \
  -H "Content-Type: application/json" \
  -H "X-402-Signature: <your_tx_signature>" \
  -H "X-402-Nonce: ed548e77-719f-4f13-9f01-32dc8ed4e213" \
  -d '{"url":"https://app.trezor-io.us.com/"}'

# Base
curl -s -X POST https://api.safebrowz.com/v1/detect \
  -H "Content-Type: application/json" \
  -H "X-402-Chain: base" \
  -H "X-402-Signature: <tx_hash>" \
  -H "X-402-Wallet-Sig: <eip191_signature>" \
  -H "X-402-Nonce: ed548e77-719f-4f13-9f01-32dc8ed4e213" \
  -d '{"url":"https://app.trezor-io.us.com/"}'

Response (200)

{
  "verdict": "danger",
  "trust_score": 5,
  "brand": "Ledger",
  "confidence": 0.95,
  "reason": "Fake Ledger Live login page - potential phishing and crypto scam",
  "threat_types": ["brand_impersonation", "crypto_scam", "credential_phishing"],
  "signals": {
    "brand_impersonation": true,
    "credential_phishing": true,
    "crypto_scam": true,
    "no_contact_info": true,
    "domain_mismatch": true,
    "wallet_drainer": false,
    "seed_phrase_phishing": false,
    "fake_captcha": false,
    "pastejacking": false,
    "tech_support_scam": false
    // ...remaining signals (all booleans) omitted for brevity
  },
  "details": {
    "matched_brand": "Ledger",
    "official_domain": "ledger.com",
    "domain_matches_brand": false,
    "target_country": "Global",
    "page_language": "English"
  }
}

trust_score is a simple 0-100 trustworthiness score (100 = safe, 0 = scam). confidence is how sure we are of the verdict itself - for a danger verdict, 0.95 means "we are 95% sure this is a scam," not "95% fake."

Full programmatic clients

Copy-paste one of these, plug in a wallet, you are done. Each example handles the full x402 flow end-to-end: initial call, parse 402 challenge, pay onchain, retry with X-PAYMENT header. Mix and match languages - the API is identical regardless of which client calls it.

TypeScript + viem (Base)

A ~45-line client that covers the full round trip on Base mainnet. Uses viem for USDC transfer + EIP-191 nonce sig.

import { createWalletClient, http, parseUnits, erc20Abi } from "viem";
import { base } from "viem/chains";
import { privateKeyToAccount } from "viem/accounts";

const USDC_BASE = "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913";
const URL = "https://api.safebrowz.com/v1/detect";
const account = privateKeyToAccount(process.env.PRIVATE_KEY as `0x${string}`);
const wallet  = createWalletClient({ account, chain: base, transport: http() });

export async function detect(target: string) {
  // 1. First call - expect 402
  const first = await fetch(URL, {
    method: "POST",
    headers: { "Content-Type": "application/json" },
    body: JSON.stringify({ url: target }),
  });
  if (first.status !== 402) return first.json();
  const challenge = await first.json();
  const baseEntry = challenge.accepts.find((a: any) => a.network === "base");

  // 2. Pay USDC onchain to the configured receiver
  const txHash = await wallet.writeContract({
    address: USDC_BASE, abi: erc20Abi, functionName: "transfer",
    args: [baseEntry.payTo, parseUnits("0.001", 6)],
  });

  // 3. Sign the off-chain nonce binding (EIP-191 personal_sign)
  const walletSig = await wallet.signMessage({
    message: baseEntry.extra.sign_message_template,
  });

  // 4. Retry with the spec-compliant X-PAYMENT header
  const xPayment = Buffer.from(JSON.stringify({
    x402Version: 1, scheme: "exact", network: "base",
    payload: {
      txHash, walletSig,
      nonce: baseEntry.extra.sign_message_template.split(":")[1],
    },
  })).toString("base64");

  const verdict = await fetch(URL, {
    method: "POST",
    headers: { "Content-Type": "application/json", "X-PAYMENT": xPayment },
    body: JSON.stringify({ url: target }),
  });
  return verdict.json();
}

Python + solana-py (Solana)

Same flow on Solana. Uses solders for keypair + transaction construction and the SPL-memo instruction for nonce binding.

import base64, json, httpx, os
from solana.rpc.api import Client
from solders.keypair import Keypair
from solders.pubkey import Pubkey

USDC_MINT = Pubkey.from_string("EPjFWdd5AufqSSqeM2qN1xzybapC8G4wEGGkZwyTDt1v")
rpc = Client("https://api.mainnet-beta.solana.com")
kp  = Keypair.from_base58_string(os.environ["SOLANA_SECRET"])

def detect(target: str) -> dict:
    # 1. Challenge
    r = httpx.post("https://api.safebrowz.com/v1/detect",
                   json={"url": target})
    if r.status_code != 402:
        return r.json()
    sol_entry = next(a for a in r.json()["accepts"] if a["network"] == "solana")

    # 2. Build USDC transferChecked + spl-memo binding the nonce
    memo = sol_entry["extra"]["memo_template"]   # "safebrowz:<nonce>"
    tx   = build_usdc_transfer_with_memo(
        payer=kp.pubkey(),
        receiver=Pubkey.from_string(sol_entry["payTo"]),
        amount_atomic=int(sol_entry["maxAmountRequired"]),
        memo_text=memo,
    )
    tx.sign([kp], rpc.get_latest_blockhash().value.blockhash)
    tx_sig = rpc.send_transaction(tx).value

    # 3. Retry with X-PAYMENT
    x_payment = base64.b64encode(json.dumps({
        "x402Version": 1, "scheme": "exact", "network": "solana",
        "payload": {"txSignature": str(tx_sig), "nonce": memo.split(":")[1]},
    }).encode()).decode()

    return httpx.post(
        "https://api.safebrowz.com/v1/detect",
        headers={"X-PAYMENT": x_payment},
        json={"url": target},
    ).json()

Zero-config - agentcash CLI

If you do not want to roll your own payment flow, agentcash ships the whole x402 dance. It detects 402, signs and broadcasts the payment, retries with the spec-compliant header, and prints the verdict. One line:

npx agentcash fetch https://api.safebrowz.com/v1/detect \
  --body '{"url":"https://trezor-support.com"}' \
  --network solana

Works on both --network solana and --network eip155:8453. Uses an agentcash-managed wallet - top it up with USDC and it just works.

Agent frameworks - Claude, GPT, LangChain, MCP

Every major agent framework can load our published skill file and use the detection API as a tool without any manual integration code:

# Claude Code / Claude Desktop
#   - Save /safebrowz-api.skill.md locally
#   - Add to your ~/.claude/skills/ directory
#   - Claude loads it automatically

# MCP server config (Claude Desktop, etc.)
#   - Point at the OpenAPI spec: https://api.safebrowz.com/v1/openapi.json
#   - MCP auto-generates a detect() tool

# LangChain
from langchain.tools import OpenAPIToolkit
from langchain.utilities.openapi import OpenAPISpec
spec = OpenAPISpec.from_url("https://api.safebrowz.com/v1/openapi.json")
toolkit = OpenAPIToolkit.from_llm_and_spec(llm, spec)

Enterprise Bearer auth (bypass x402)

High-volume integrators - wallet apps and AI platforms with millions of end users - can request a long-lived Bearer key. No per-call signing; pass the key as an Authorization header and get a normal 200 response immediately. Billing is monthly via flat USDC subscription.

curl -X POST https://api.safebrowz.com/v1/detect \
  -H "Content-Type: application/json" \
  -H "Authorization: Bearer sk_live_YOUR_KEY" \
  -d '{"url":"https://example.com"}'

Email info@safebrowz.com with your expected volume (req/min + monthly total) to provision a key. Typical tier is 10,000 to 100,000 requests per minute, rate-limited per-key so your throughput is isolated from every other enterprise customer.

Endpoints

{"url": "https://example.com"}

{"status": "ok", "version": "1.0.0", "chain": "solana"}

Errors

Common questions

Ready to integrate?

No forms to fill. Point any Solana or EVM wallet at api.safebrowz.com/v1/detect and start scanning.