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Tereno Contract Upgrade Window Claim
x402
Tereno Contract Upgrade Window Claim is a paid API for AI agents from tereno.xyz, paid per call via x402, $0.25/call, status unknown (last checked 2026-09-16).
Publishes a verifiable, challengeable claim that a Base proxy contract's implementation slot did not change during a specified block window
Price / call$0.25
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
Returns a JSON object containing a claim object with claimId, claimType, and status ('open'), a receiptUrl path for retrieving the permanent receipt, pricing details showing 0.25 USDC paid, and a breadcrumbStatus indicating whether the claim was written to the network.
Example use cases
Certifying contract stability for an audit
“I need to prove that the Base proxy at 0x1234...abcd didn't get upgraded between blocks 10000000 and 10500000 — publish a Tereno claim with a $100 falsification reward open for 168 hours, signed from my wallet 0xAAAA...BBBB.”
DeFi protocol upgrade monitoring alert
“We just finished a freeze window for our protocol. Publish a challengeable Tereno claim that our proxy contract 0xDEAD...BEEF had no implementation changes between blocks 11000000 and 11999999, offer $25 to anyone who can falsify it, and keep it open for 48 hours — use wallet 0xC0FF...EE11.”
Pre-integration trust check for a partner contract
“Before we integrate with this third-party contract at 0x9999...1111 on Base, I want to publish a Tereno claim that it wasn't upgraded between blocks 9500000 and 10000000, with a $10 reward for falsification and a 24-hour challenge window, from wallet 0xF00D...CAFE.”
Technical details
Endpoint
POSThttps://tereno.xyz/api/v1/claimsWhen to prefer
Use this endpoint when you need a publicly verifiable, challengeable on-chain record asserting that a Base proxy contract's implementation did not change over a specific historical block window. Prefer this over off-chain attestations when auditability, third-party falsifiability, and economic accountability (via a reward for disprovers) matter — such as pre-integration due diligence, post-freeze compliance certification, or DeFi governance upgrade monitoring.
Side effects
- Invalid or malformed wallet/address (not a valid 0x Ethereum address) — 400 Bad Request
- Block window out of allowed range (must be 1000–2,000,000 blocks) — 400 validation error
- toBlock is in the future — 400 Bad Request
- deadlineHours outside 1–720 range — 400 Bad Request
- Payment not provided or insufficient — 402 Payment Required (x402)
- Claim already exists for this address/window/wallet combination — 409 Conflict
- Network or RPC error resolving implementation slot — 503 Service Unavailable
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| inputrequired | object | |
| output | object |
Output
Schema · Response
{
"type": "json",
"example": {
"claim": {
"status": "open",
"claimId": "0xabc",
"claimType": "contract.upgrade.window.claim"
},
"pricing": {
"currency": "USDC",
"pricePaidUsd": 0.25
},
"receiptUrl": "/api/v1/claims/0xabc/receipt",
"breadcrumbStatus": "written"
}
}Tags
x402
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