# TheLoopBreaker Belief Attestation Filer

> TheLoopBreaker Belief Attestation Filer is a paid API for AI agents from theloopbreaker.com, paid per call via x402, $0.050000/call, status unknown (last checked 2026-09-15).

Prepares an unsigned blockchain transaction to file a zero-knowledge belief attestation on the BeliefAttestationVerifier smart contract, funded by a $0.25 USDC x402 payment

## Facts

- Endpoint: POST https://theloopbreaker.com/api/x402/actions/file-attestation
- Price: $0.050000/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-24d346f3
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_MFEyQWf8Cayo6w9fMCnJI

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-24d346f3 -d '<json body>'
```

Example prompt: File a belief attestation on the BeliefAttestationVerifier contract using my wallet 0xYourWallet, zk proof 0x1234567890abcdef..., and public inputs [0xabcdef1234567890...] — give me the unsigned transaction I can sign myself.

## When to prefer this

Use this endpoint when you need to file a cryptographically verifiable belief attestation on-chain using a zero-knowledge proof, and want a server-side transaction encoder that never touches your private keys. Ideal for agents operating in the Vaultfire/TheLoopBreaker ecosystem that need to anchor beliefs to the BeliefAttestationVerifier smart contract on Base or supported mainnet chains.

## Known failure modes

- Missing X-PAYMENT header returns HTTP 402 with payment instructions and accepted asset details
- Invalid or malformed zk proof bytes result in encoding failure
- Public inputs array mismatch with the proof causes contract-level rejection
- Wallet address not provided or malformed returns validation error
- Payment amount insufficient or asset mismatch triggers x402 rejection

## How this service works

File a belief attestation on the BeliefAttestationVerifier contract (zk proof + public inputs). Pay $0.25 USDC, receive a fully-encoded unsigned transaction, sign in your wallet. No private keys handled server-side.

## Output

Returns a fully ABI-encoded unsigned transaction ready to be signed in the caller's wallet. The response includes the transaction payload targeting the BeliefAttestationVerifier contract, along with the x402 payment receipt confirming the $0.25 USDC charge. No private keys are transmitted or handled server-side.

## 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-24d346f3/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)