Is this Base contract safe to interact with? Detect whether an address has no code, is an
Is this Base contract safe to interact with? Detect whether an address has no code, is an upgradeable proxy, or is currently paused, and get a bounded allow, review or block trust verdict with evidence and block freshness before you call it. Positive-sum by design: $0.03 when nobody has checked this contract yet, $0.02 on a shared bytecode fingerprint, $0.01 once another agent has computed the full answer — and the wallet that computed it first earns a share of every reuse.
30000 (raw units)
price
2
calls / 30d
2
unique payers
2026-09-05
updated
Provider
www.tereno.xyz · discovered, not yet claimed by its owner
Payment (x402 accepts[])
[
{
"scheme": "exact",
"network": "eip155:8453",
"payTo": "0xfbF218ACCBb0D57fc4E8fc3E2A885C910c4C9e94",
"asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
"amount": "30000",
"maxTimeoutSeconds": 300
}
]Output schema
{
"bazaar": {
"info": {
"input": {
"method": "GET",
"queryParams": {
"address": "0x1111111111111111111111111111111111111111"
},
"type": "http"
},
"output": {
"example": {
"capabilityId": "contract.guard",
"capabilityVersion": "1.0.0",
"invocationId": "uuid",
"nextCall": {
"recheck": {
"capabilityId": "contract.guard",
"listPriceUsdCeiling": 0.003,
"method": "GET",
"notBeforeBlock": 129,
"payment": "x402",
"url": "https://www.tereno.xyz/api/v1/capabilities/contract.guard/invoke?address=0x1111111111111111111111111111111111111111"
},
"validForSeconds": 10,
"validUntilBlock": 128,
"watch": {
"baseline": "The first contract.change call on an address records the baseline.",
"capabilityId": "contract.change",
"listPriceUsdCeiling": 0.002,
"method": "GET",
"payment": "x402",
"url": "https://www.tereno.xyz/api/v1/capabilities/contract.change/invoke?address=0x1111111111111111111111111111111111111111"
}
},
"pricing": {
"actualCacheStatus": "miss",
"creditAppliedUsd": 0,
"currency": "USDC",
"listPriceUsd": 0.003,
"pricePaidUsd": 0.003,
"quotedCacheStatus": "miss"
},
"receiptUrl": "/api/v1/receipts/uuid",
"result": {
"computedAtBlock": 123,
"reasonCodes": [
"UPGRADEABLE_PROXY"
],
"validUntilBlock": 128,
"verdict": "review"
},
"verdict": "review"
},
"type": "json"
}
},
"schema": {
"$schema": "https://json-schema.org/draft/2020-12/schema",
"properties": {
"input": {
"additionalProperties": false,
"properties": {
"method": {
"enum": [
"GET"
],
"type": "string"
},
"queryParams": {
"additionalProperties": false,
"properties": {
"address": {
"description": "Base contract address to preflight.",
"pattern": "^0x[a-fA-F0-9]{40}$",
"type": "string"
},
"quote": {
"description": "Optional single-use quote id.",
"type": "string"
}
},
"required": [
"address"
],
"type": "object"
},
"type": {
"const": "http",
"type": "string"
}
},
"required": [
"type",
"method"
],
"type": "object"
},
"output": {
"properties": {
"example": {
"properties": {
"capabilityId": {
"const": "contract.guard"
},
"invocationId": {
"type": "string"
},
"nextCall": {
"type": [
"object",
"null"
]
},
"pricing": {
"type": "object"
},
"receiptUrl": {
"type": "string"
},
"result": {
"type": "object"
},
"verdict": {
"enum": [
"allow",
"review",
"block"
]
}
},
"required": [
"capabilityId",
"invocationId",
"verdict",
"result",
"pricing",
"receiptUrl"
],
"type": "object"
},
"type": {
"type": "string"
}
},
"required": [
"type"
],
"type": "object"
}
},
"required": [
"input"
],
"type": "object"
}
},
"builder-code": {
"info": {
"a": "bc_8kag0yoi"
},
"schema": {
"$schema": "https://json-schema.org/draft/2020-12/schema",
"additionalProperties": false,
"properties": {
"a": {
"description": "App builder code",
"pattern": "^[a-z0-9_]{1,32}$",
"type": "string"
},
"s": {
"description": "Service builder codes",
"items": {
"pattern": "^[a-z0-9_]{1,32}$",
"type": "string"
},
"type": "array"
},
"w": {
"description": "Wallet builder code",
"pattern": "^[a-z0-9_]{1,32}$",
"type": "string"
}
},
"type": "object"
}
}
}Use it
curl
curl "https://www.tereno.xyz/api/v1/capabilities/contract.guard/invoke" # -> 402 Payment Required, accepts[] lists how to pay # retry with a PAYMENT-SIGNATURE (or PAYMENT header) once paid
JavaScript
const res = await fetch("https://www.tereno.xyz/api/v1/capabilities/contract.guard/invoke");
if (res.status === 402) {
const { accepts } = await res.json();
// pay one of accepts[] via an x402 client, then retry with the payment header
}Python
import httpx
res = httpx.get("https://www.tereno.xyz/api/v1/capabilities/contract.guard/invoke")
if res.status_code == 402:
accepts = res.json()["accepts"]
# pay one of accepts[] via an x402 client, then retry with the payment headerMachine-readable
Everything on this page is also available as clean JSON at /resources/2460.json, and this resource appears in /discovery/resources and /discovery/search.