SYS84 Agent Decision Layer

Machine-readable wallet, payment, counterparty, and pre-trade decisions for autonomous agents. Payment is USDC on Base. No account or API key.

curl https://api.sys84.org/mcp \
  -H 'Content-Type: application/json' \
  -H 'Accept: application/json, text/event-stream' \
  --data '{"jsonrpc":"2.0","id":1,"method":"initialize","params":{"protocolVersion":"2025-03-26","capabilities":{},"clientInfo":{"name":"my-agent","version":"1.0"}}}'

Exact request body

{
  "address": "0x64e4e6c18849ba687A468dcad0A582AC6f8089E4",
  "chain": "base",
  "refresh": true
}

Discover payment requirements

curl -i -X POST https://api.sys84.org/v1/services/wallet_risk_snapshot \
  -H "Content-Type: application/json" \
  -d '{"address":"0x64e4e6c18849ba687A468dcad0A582AC6f8089E4","chain":"base","refresh":true}'

Pay with awal x402

npx awal@2.0.3 x402 details https://api.sys84.org/v1/services/wallet_risk_snapshot --json

npx awal@2.0.3 x402 pay https://api.sys84.org/v1/services/wallet_risk_snapshot \
  -X POST \
  -d '{"address":"0x64e4e6c18849ba687A468dcad0A582AC6f8089E4","chain":"base","refresh":true}' \
  --max-amount 10000 \
  --json

Pay with raw x402 headers

First call without payment to get the HTTP 402 challenge. Sign the returned EIP-3009 payment requirement, then retry with one of these headers:

PAYMENT-SIGNATURE: <base64 PaymentPayload>
X-Payment: <base64 PaymentPayload>

Official x402 Node / axios client

Use the official x402 axios wrapper when possible. It reads PAYMENT-REQUIRED, signs the EIP-3009 authorization, retries with PAYMENT-SIGNATURE, and reads PAYMENT-RESPONSE after settlement.

npm install @x402/axios @x402/evm viem axios

import axios from "axios";
import {{ wrapAxiosWithPayment, x402Client }} from "@x402/axios";
import {{ ExactEvmScheme }} from "@x402/evm/exact/client";
import {{ privateKeyToAccount }} from "viem/accounts";

const account = privateKeyToAccount(process.env.EVM_PRIVATE_KEY);
const client = new x402Client();
client.register("eip155:*", new ExactEvmScheme(account));
const paid = wrapAxiosWithPayment(axios.create(), client);

const response = await paid.post("https://api.sys84.org/v1/services/wallet_risk_snapshot", {{
  address: "0x64e4e6c18849ba687A468dcad0A582AC6f8089E4",
  chain: "base",
  refresh: true
}});

Manual axios fallback

Plain axios does not pay automatically. If your agent receives HTTP 402 without the official wrapper, it must read the returned accepts[0], sign an EIP-3009 TransferWithAuthorization, and retry the same request with X-Payment. Download the helper at /x402/client/axios.js.

npm install axios ethers
curl -o x402AxiosClient.js https://api.sys84.org/x402/client/axios.js

const { callSys84PaidService } = require("./x402AxiosClient");

const response = await callSys84PaidService("wallet_risk_snapshot", {
  address: "0x64e4e6c18849ba687A468dcad0A582AC6f8089E4",
  chain: "base",
  refresh: true
});

Paid services

Discover tokens, then check the risks

The token scanner costs 0.02 USDC on Base. It returns selected market snapshots with source, retrieval time, liquidity, price changes, and recent activity. Missing activity is null; reported zero stays zero.

curl -i 'https://api.sys84.org/scan/tokens?chain=base&limit=10&min_liquidity=10000'

This unsigned request returns a 402 quote. Use the payment client above to authorize the quoted amount. Compare 5-minute and 1-hour activity with the 24-hour total; the ranking is a heuristic, not a prediction or safety check.

For a selected token, request a separate 0.10 USDC risk check with its address and your proposed size:

POST /v1/services/pre_trade_guard
{"token_address":"ADDRESS_FROM_SCAN","chain":"base","size_usd":25,"risk_tolerance":"low"}

Replace ADDRESS_FROM_SCAN with the returned token address. Review missing evidence, warnings, and the decision. Neither request executes a trade. Inspect each quote; do not automatically repay after a timeout.

Settled checks paid delivery against the listing. Its badge is not an endorsement of token safety or financial accuracy.

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