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AgentSpendGuard Transaction Explain & Calldata Risk API
x402
AgentSpendGuard Transaction Explain & Calldata Risk API is a paid API for AI agents from api-production-2800.up.railway.app, paid per call via x402, $0.010000/call, status unknown (last checked 2026-09-15).
Analyzes EVM transaction calldata before signing, returning a human-readable intent explanation, risk score, reason codes, and recommended action for AI wallet agents.
Price / call$0.010000
Success—
StatusUnknown
How this service works
Transaction explain and calldata risk API by AgentSpendGuard for AI wallet agents before signing EVM transactions. Search keywords: transaction explain, calldata explain, approval risk detector, unlimited allowance, EVM signing guardrail, wallet agent safety, agent spend guard. Returns strict JSON intent, risk score, reason codes, and recommended action.
Output
A strict JSON object containing a plain-language intent description of what the transaction does, a numeric risk score (0-100), one or more reason codes (e.g. UNLIMITED_ALLOWANCE, UNKNOWN_CONTRACT, PHISHING_PATTERN), and a recommended action (allow, caution, or block) for the agent to act on before signing.
Example use cases
Detect unlimited token approvals before signing
“I'm about to approve a token to a DeFi protocol but I'm worried about unlimited allowances — can you check this transaction calldata and tell me if it's asking for unlimited spending permissions? The contract is 0x68b3465833fb72B5A828cCEd3882857713B5aA28 and the calldata is 0x095ea7b3000000000000000000000000e592427a0aece92de3edee1f18e0157c05861564ffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffff.”
Identify phishing and malicious contract interactions
“This contract address 0x1234567890123456789012345678901234567890 is trying to get me to call some function — before I sign anything, analyze this calldata 0xa9059cbb000000000000000000000000d8da6bf26964af9d7eed9e03e53415d37aa96045 and tell me if it looks like a phishing scam or if there are any red flags I should know about.”
Understand complex DeFi transaction intent and risk
“I'm about to execute a swap on a DEX but the calldata looks complicated — explain what this transaction actually does 0x414bf3890000000000000000000000001111111254fb6c44bac0bed2854e76f90643097d and give me a risk assessment before I sign on mainnet.”
Technical details
Endpoint
POSThttps://api-production-2800.up.railway.app/v1/tx-explainWhen to prefer
Use this endpoint when an AI wallet agent or autonomous DeFi agent needs a pre-signing safety check on raw EVM calldata, especially for detecting unlimited token approvals, phishing contract interactions, or unexpected fund transfers. Prefer this over generic contract explorers when you need a structured JSON verdict with risk scores and reason codes that an agent can act on programmatically.
Side effects
- Invalid or unparseable calldata returns an error response
- Unsupported chain ID returns a 400 or unknown-chain error
- Missing required fields in POST body returns 422 validation error
- Payment not included or invalid x402 payment header returns 402 Payment Required
- Contract not found on specified chain returns partial analysis with low confidence
- Rate limiting or service unavailability returns 503
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| to | string | |
| datarequired | string | |
| from | string | |
| chainId | integer | |
| valueWei | string | |
| knownSpenders | array |
Tags
x402
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