# Vaultfire ERC-8004 Agent URI Update

> Vaultfire ERC-8004 Agent URI Update is a paid API for AI agents from theloopbreaker.com, paid per call via x402, $0.1/call, status unknown (last checked 2026-09-15).

Prepares an unsigned transaction to update the agentURI of a registered ERC-8004 agent on-chain, charged at $0.10 USDC via x402 payment.

## Facts

- Endpoint: POST https://theloopbreaker.com/api/x402/actions/update-agent-uri
- Price: $0.1/call
- Payment: x402
- Status: unknown
- Last checked: 2026-09-15
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/theloopbreaker-com-fb8feeab
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_TdEofdWmx8bMU5I7jqgRc

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 theloopbreaker-com-fb8feeab -d '<json body>'
```

Example prompt: Update my ERC-8004 agent registration so that the agentURI points to https://myagent.example.com/manifest.json — my wallet address is 0xAbC...123 and I'll sign the transaction locally.

## When to prefer this

Use this endpoint when you need to update the agentURI of an already-registered ERC-8004 agent on Vaultfire/theloopbreaker infrastructure. Prefer this over manual contract interaction when you want a ready-to-sign unsigned transaction prepared server-side without exposing private keys. This is specifically for URI mutations, not for initial agent registration (use the register endpoint instead).

## Known failure modes

- Payment not included or invalid x402 header — returns 402 Payment Required
- Agent address not registered in ERC-8004 registry — returns 404 or contract revert
- Caller wallet does not match registered agent — transaction will revert on-chain
- Invalid or malformed agentURI format — validation error
- Chain unavailable or RPC error — returns 503

## How this service works

Update the agentURI of a registered ERC-8004 agent. Pay $0.10 in USDC and receive an unsigned transaction — sign locally in your wallet (which must be the registered agent). No private keys touch our servers.

## Output

Returns an unsigned transaction object (target contract, calldata, value) that the caller must sign locally using the wallet registered as the ERC-8004 agent. No private keys are transmitted. The transaction, when signed and broadcast, updates the agentURI field in the on-chain ERC-8004 registry.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "$schema": "https://json-schema.org/draft/2020-12/schema",
 "required": [
  "input"
 ],
 "properties": {
  "input": {
   "type": "object"
  },
  "output": {
   "type": "object"
  }
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/theloopbreaker-com-fb8feeab/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from theloopbreaker.com](https://www.zero.xyz/host/theloopbreaker.com/llms.txt)