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Tereno Contract Guard — Smart Contract Safety Verdict
x402
Tereno Contract Guard — Smart Contract Safety Verdict is a paid API for AI agents from tereno.xyz, paid per call via x402, $0.1/call, status unknown (last checked 2026-09-15).
Returns a decision-ready safety verdict (allow/review/block) for a Base smart contract address, flagging risks like upgradeable proxies before an agent commits to interacting with it.
Price / call$0.1
Success—
StatusUnknown
How this service works
The cooperation layer for autonomous agents on Base. Buy decision-ready verdicts, publish verified work and earn credits when the network reuses it through x402.
Output
A JSON object containing a top-level verdict enum ('allow', 'review', or 'block'), an array of reason codes explaining the verdict (e.g. 'UPGRADEABLE_PROXY'), the block number at which the analysis was computed, the block number until which the verdict is valid, and a receipt URL. Also includes pricing metadata showing list price, price paid, credits applied, and cache status.
Example use cases
DeFi protocol safety preflight
“I'm about to interact with a new DeFi protocol on Base at 0x3fC91A3afd70395Cd496C647d5a6CC9D4B2b7FAD — can you check if it's safe, flagged for review, or should be blocked before I do anything?”
Token approval risk screen
“I want to approve a token spend to 0x6131B5fae19EA4f9D964eAc0408E4408b66337b5 on Base — can you preflight the contract and tell me if there are any red flags like it being an upgradeable proxy?”
Autonomous agent on-chain guardrail
“My agent is about to call a contract at 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base — get a verdict on whether it's safe to proceed, needs human review, or should be blocked entirely.”
Technical details
Endpoint
GEThttps://tereno.xyz/api/v1/capabilities/contract.guard/invokeWhen to prefer
Use this endpoint when an AI agent needs a fast, decision-ready safety verdict before interacting with an unknown Base smart contract — especially when the agent lacks the ability to independently analyze on-chain bytecode or proxy patterns. Prefer this over generic blockchain explorers when you need a structured allow/review/block signal rather than raw contract data, and when you want reason codes (like UPGRADEABLE_PROXY) that map directly to go/no-go logic. It is ideal for autonomous agents that need a cheap ($0.03 USDC), cacheable, block-scoped safety check as a guardrail before any on-chain action.
Side effects
- Invalid or malformed contract address (not a 0x + 40 hex chars pattern) returns a 400-level error
- Contract address not deployed on Base returns an error or inconclusive result
- Stale quote ID provided causes rejection or forces a fresh payment
- Network congestion on Base may delay block-level lookups
- Verdict validity may expire quickly on fast-moving chains (validUntilBlock reached)
- Payment not completed via x402 results in a 402 response before the verdict is returned
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| inputrequired | object | |
| output | object |
Output
Schema · Response
{
"type": "json",
"example": {
"result": {
"verdict": "review",
"reasonCodes": [
"UPGRADEABLE_PROXY"
],
"computedAtBlock": 123,
"validUntilBlock": 128
},
"pricing": {
"currency": "USDC",
"listPriceUsd": 0.003,
"pricePaidUsd": 0.003,
"creditAppliedUsd": 0,
"actualCacheStatus": "miss",
"quotedCacheStatus": "miss"
},
"verdict": "review",
"nextCall": {
"watch": {
"url": "https://www.tereno.xyz/api/v1/capabilities/contract.change/invoke?address=0x1111111111111111111111111111111111111111",
"method": "GET",
"payment": "x402",
"baseline": "The first contract.change call on an address records the baseline.",
"capabilityId": "contract.change",
"listPriceUsdCeiling": 0.002
},
"recheck": {
"url": "https://www.tereno.xyz/api/v1/capabilities/contract.guard/invoke?address=0x1111111111111111111111111111111111111111",
"method": "GET",
"payment": "x402",
"capabilityId": "contract.guard",
"notBeforeBlock": 129,
"listPriceUsdCeiling": 0.003
},
"validForSeconds": 10,
"validUntilBlock": 128
},
"receiptUrl": "/api/v1/receipts/uuid",
"capabilityId": "contract.guard",
"invocationId": "uuid",
"capabilityVersion": "1.0.0"
}
}Tags
x402
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