verified-burst

An MCP tool that lets your agent buy verified inference at hard decisions and pay only if the answer is correct. At an irreversible/ambiguous/deadline fork, your agent escalates to fast silicon, samples best-of-N, runs the answers through a verifier, and pays a few tenths of a cent over x402 — charged only if it passes. Non-verified results cost nothing. Budget-capped, BYOK.

Install

pip install verified-burst
# or zero-install:  uvx verified-burst   (pipx run verified-burst)

Add to your MCP client

{
  "mcpServers": {
    "verified-burst": {
      "command": "verified-burst",
      "env": {
        "BURST_BUYER_KEY": "0x<your Base wallet private key>",
        "BURST_PROVIDER_KEY": "csk-<your Cerebras key>"
      }
    }
  }
}

Fund the wallet with a little USDC on Base. BURST_PROVIDER_KEY is optional (BYOK — your tokens, your rate limit). BURST_ENDPOINT overrides the host (default https://solcleus.com/v1/burst).

The tool

buy_verified_burst(request, strategy="best_of_n", n=3, verifier="self_consistency", answer_key=None, model=None)

buy_verified_burst(
  request="Is this clause enforceable? yes/no",
  answer_key=["regex", "(yes|no)"]
)

Returns the verified answer + a receipt. You are charged only when the verifier passes. Spend is capped per wallet server-side, so autonomous purchases are safe.

How the money moves (no mystery)

1. The endpoint answers an unpaid call with HTTP 402 + payment requirements.
2. This client signs an x402 (EIP-3009) authorization with your wallet and retries.
3. The host verifies the answer and settles on-chain only if it passed — your USDC moves directly to the provider; the host eats the gas. Self-hosted facilitator, no third party holding funds.

Service discovery: GET https://solcleus.com/.well-known/x402.