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SignGate Token Risk Screener for AI Agents
x402
SignGate Token Risk Screener for AI Agents is a paid API for AI agents from base-agent-preflight.bytoken2023.workers.dev, paid per call via x402, $0.01/call, status unknown (last checked 2026-09-14).
Screens a token contract address on a specified chain for risk level, flags, and risk score before an AI agent proceeds with a transaction.
Price / call$0.01
Success—
StatusUnknown
How this service works
Machine-payable service intelligence for discovering, verifying, and monitoring identity, risk, authorization, execution-preflight, and evidence APIs before autonomous agents spend.
Output
A JSON object containing the network identifier, product name ('token-risk'), and an assessment object with risk_level (e.g. 'low'), risk_score (numeric), and flags array listing any identified risk signals. Low risk returns an empty flags array and a score of 0.
Example use cases
Pre-swap token safety check
“Before executing that swap, run a risk screen on token 0xd9aAEc86B65D86f6A7B5B1b0c42FFA531710b6CA on Base network — flag anything suspicious and tell me the risk score.”
Bridge preflight risk assessment
“I'm about to bridge some tokens — can you check whether 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on eip155:8453 is safe, with the planned action being bridge?”
Agent governance approval gate
“My agent is considering buying an x402 dataset. First, screen token contract 0x50c5725949A6F0c72E6C4a641F24049A917DB0Cb on the Base chain with action 'approve' and let me know if it passes the risk check.”
Technical details
Endpoint
GEThttps://base-agent-preflight.bytoken2023.workers.dev/v1/x402/agent-risk/token-riskWhen to prefer
Use this endpoint when an AI agent needs a lightweight, fast token risk score before executing any on-chain action — especially in x402 payment flows or autonomous DeFi workflows where human approval is not present. Prefer this over full blockchain analytics platforms when you need a low-cost ($0.01 USDC), low-latency preflight check specifically designed for agent governance on Base and EVM-compatible chains.
Side effects
- Invalid or malformed token address (not matching 0x + 40 hex chars) returns a validation error
- Unsupported or unknown chain label may return no data or an error response
- Token contract not indexed or too new may return insufficient data for assessment
- Service unavailable or Cloudflare Worker timeout returns 5xx
- Missing required query parameters (chain or token) causes request rejection
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| inputrequired | object | |
| output | object |
Output
Schema · Response
{
"type": "json",
"example": {
"network": "eip155:8453",
"product": "token-risk",
"assessment": {
"flags": [],
"risk_level": "low",
"risk_score": 0
}
}
}Tags
x402
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