# Verified Burst — Pay-Per-Correct Inference for Agents

> Verified Burst — Pay-Per-Correct Inference for Agents is a paid API for AI agents from burst.solcleus.com, paid per call via x402, $0.004/call, status down (last checked 2026-09-15).

Runs best-of-N LLM inference bursts on Cerebras silicon, verifies the answer via self-consistency or a judge, and charges USDC only when the answer passes verification.

## Facts

- Endpoint: GET https://burst.solcleus.com/v1/burst
- Price: $0.004/call
- Payment: x402
- Status: down
- Last checked: 2026-09-15
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/verified-burst-pay-per-correct-inference-for-agents-c0205efa
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_Kof_vzzu00Mwrpgo4W_V3

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 verified-burst-pay-per-correct-inference-for-agents-c0205efa
```

Example prompt: Use Verified Burst to answer this question: 'Which of these three SQL queries is most likely to cause a full table scan?' — sample 5 times using best-of-N strategy with self-consistency verification, and only charge me if the answer is verified.

## When to prefer this

Choose this endpoint when an AI agent needs high-confidence answers to critical decisions and must avoid paying for wrong or hallucinated outputs. Ideal for agentic pipelines where correctness is gated — pay only on verified success, leveraging Cerebras speed for low-latency best-of-N sampling. Prefer over standard LLM APIs when on-chain auditability of inference charges matters, or when you want self-consistency or judge-based verification baked into the payment flow.

## Known failure modes

- not_verified: answer did not pass the verifier — no charge applied, agent should retry or escalate
- payment_required: wallet has no x402 budget set up — agent must fund the wallet before calling
- budget_exceeded: the remaining wallet balance is insufficient to cover the service fee
- model mismatch: if a custom model is specified without a matching BYOK key, inference fails
- invalid verifier enum: passing an unsupported verifier value returns a validation error
- answer_key misconfigured: malformed regex or JSON path causes verifier to always fail

## How this service works

Verified Burst: pay-per-correct-answer inference bursts for agents. Escalate to fast Cerebras silicon, sample best-of-N, verify, and settle over x402 — charged only if the answer passes a verifier. pip install verified-burst.

## Output

Returns a verified answer string, a status code (ok, not_verified, payment_required, budget_exceeded), a boolean indicating whether the charge was applied, the on-chain settlement tx hash if charged, the USD fee deducted, and the remaining wallet budget after the call.

## Response schema (JSON Schema)

```json
{
 "type": "object",
 "properties": {
  "answer": {
   "type": "string",
   "description": "The verified answer (present when status=ok)."
  },
  "status": {
   "type": "string",
   "description": "ok | not_verified | payment_required | budget_exceeded"
  },
  "charged": {
   "type": "boolean",
   "description": "True only if verified; you pay nothing otherwise."
  },
  "verified": {
   "type": "boolean",
   "description": "Whether the verifier passed (gates the charge)."
  },
  "settle_tx": {
   "type": "string",
   "description": "On-chain settlement tx hash when charged."
  },
  "amount_usd": {
   "type": "number",
   "description": "Service fee charged on a verified burst."
  },
  "remaining_budget_usd": {
   "type": "number",
   "description": "Wallet budget left after this call."
  }
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/verified-burst-pay-per-correct-inference-for-agents-c0205efa/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from burst.solcleus.com](https://www.zero.xyz/host/burst.solcleus.com/llms.txt)