# Tereno Proxy Claim Publisher

> Tereno Proxy Claim Publisher is a paid API for AI agents from www.tereno.xyz, paid per call via x402, $0.25/call, status unknown (last checked 2026-09-15).

Publishes a deterministic, on-chain claim that a Base proxy contract's implementation slot held a specific address across a specified block range, funded with a USDC reward for anyone who can disprove it.

## Facts

- Endpoint: POST https://www.tereno.xyz/api/v1/claims
- Price: $0.25/call
- Payment: x402
- Status: unknown
- Last checked: 2026-09-15
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/tereno-proxy-claim-publisher-f9503939
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_NJkOFSY_TgbBDxjPZRYNC

Status and success rate cover calls made through Zero and Zero's own probes. Third-party monitors may report differently.

## How to call it through Zero

Zero handles the 402 payment challenge and records the run. With the Zero CLI installed (`npm i -g @zeroxyz/cli`):

```sh
zero fetch --capability tereno-proxy-claim-publisher-f9503939 -d '<json body>'
```

Example prompt: Publish a Tereno claim asserting that the proxy contract at 0xAbC...123 on Base held implementation address 0xDef...456 continuously from block 19000000 to block 19500000 — fund it with a 10 USDC reward and set the deadline to 30 days from now.

## When to prefer this

Use this endpoint when you need a publicly verifiable, market-tested assertion that a Base proxy contract's implementation slot was stable across a specific block range — especially when a traditional audit isn't sufficient and you want cryptoeconomic proof via a funded public challenge. Prefer this over off-chain attestations or private audits when you need a reproducible survival receipt that anyone can independently verify.

## Known failure modes

- Invalid or non-existent Base proxy contract address — claim rejected
- Block range invalid (start block > end block or blocks not yet finalized) — error returned
- Insufficient USDC balance or approval for reward escrow — payment fails
- Implementation slot address does not match historical chain data — claim may be immediately challenged
- Deadline too short or in the past — validation error
- Network congestion causing on-chain write delays

## How this service works

Publish a deterministic claim about a Base proxy and let the market try to break it. You assert that a contract's implementation slot held one address across a block range, fund a reward for whoever finds a block where it did not, and Tereno writes the claim onchain and adjudicates counterexamples by historical storage reads. If nobody collects before your deadline, you get a reproducible survival receipt: not an audit, but proof the claim stood in public with money on it.

## Output

Returns an on-chain claim record including a unique claim ID, the asserted contract address, implementation slot address, block range, reward amount escrowed, deadline, and transaction reference. If the deadline passes without a successful counterexample, a survival receipt is returned as cryptographic proof the claim stood publicly with money on it. If a counterexample is found, the adjudication result and winner are returned.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "$schema": "https://json-schema.org/draft/2020-12/schema",
 "required": [
  "input"
 ],
 "properties": {
  "input": {
   "type": "object",
   "required": [
    "type",
    "method"
   ],
   "properties": {
    "type": {
     "type": "string",
     "const": "http"
    },
    "method": {
     "enum": [
      "POST"
     ],
     "type": "string"
    },
    "queryParams": {
     "type": "object",
     "required": [
      "address",
      "fromBlock",
      "toBlock",
      "rewardUsd",
      "deadlineHours",
      "wallet"
     ],
     "properties": {
      "wallet": {
       "type": "string",
       "pattern": "^0x[a-fA-F0-9]{40}$",
       "description": "The opener wallet, which must sign the request."
      },
      "address": {
       "type": "string",
       "pattern": "^0x[a-fA-F0-9]{40}$",
       "description": "Base proxy contract the assertion is about."
      },
      "toBlock": {
       "type": "integer",
       "description": "Inclusive end of the window. Must not be in the future."
      },
      "claimType": {
       "const": "contract.upgrade.window.claim",
       "description": "The only claim type whose survival is worth a receipt."
      },
      "fromBlock": {
       "type": "integer",
       "description": "Inclusive start of the window. The window must span 1000 to 2000000 blocks."
      },
      "rewardUsd": {
       "type": "number",
       "description": "What you will pay the first wallet that falsifies your claim. Not escrowed by Tereno."
      },
      "deadlineHours": {
       "type": "integer",
       "description": "How long the claim stays open to challenge, 1 to 720."
      },
      "implementation": {
       "type": [
        "string",
        "null"
       ],
       "description": "Optional. Defaults to whatever the implementation slot resolves to at toBlock."
      }
     },
     "additionalProperties": false
    }
   },
   "additionalProperties": false
  },
  "output": {
   "type": "object",
   "required": [
    "type"
   ],
   "properties": {
    "type": {
     "type": "string"
    },
    "example": {
     "type": "object",
     "required": [
      "claim",
      "breadcrumbStatus",
      "receiptUrl",
      "pricing"
     ],
     "properties": {
      "claim": {
       "type": "object"
      },
      "pricing": {
       "type": "object"
      },
      "receiptUrl": {
       "type": "string"
      },
      "breadcrumbStatus": {
       "type": "string"
      }
     }
    }
   }
  }
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/tereno-proxy-claim-publisher-f9503939/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from www.tereno.xyz](https://www.zero.xyz/host/www.tereno.xyz/llms.txt)