# Chance > The verification harness for AI agents — the independent judge between agent intent and execution. ## Docs - [Authentication](https://docs.chance.cc/api-reference/authentication.md): API keys. - [Credits balance + top-up terms](https://docs.chance.cc/api-reference/credits-balance-+-top-up-terms.md): Returns the API key's remaining credit balance and, when top-ups are enabled, the x402 payment terms for POST /api/v1/credits/topup. Free — never charges a credit. - [Fetch a verification](https://docs.chance.cc/api-reference/fetch-a-verification.md): Retrieve a previous verification by its `id` or `requestHash`. - [API overview](https://docs.chance.cc/api-reference/introduction.md): Base URL, authentication, and the response shape. - [Top up credits (x402, USDC on Base)](https://docs.chance.cc/api-reference/top-up-credits-x402-usdc-on-base.md): Buy credits for the API key's account, paid in USDC on Base mainnet over the x402 v2 protocol. Without a payment the call returns 402 with a PAYMENT-REQUIRED header carrying the exact-scheme terms (amount = credits × $0.05); an x402 client signs an EIP-3009 transferWithAuthorization (gasless for the… - [Verify an intent](https://docs.chance.cc/api-reference/verify-an-intent.md): Submit what the agent is mandated to do (`intent`) and the action it proposes to take (`action`). An independent judge model checks the action against the intent and returns a verdict — `ALLOW`, `BLOCK`, or `ESCALATE` — with its reasoning and a provable receipt. Fail-closed: treat anything other tha… - [Architecture](https://docs.chance.cc/concepts/architecture.md): How a verification runs: deterministic classification, a venue-aware judge, and a hash-chained proof. - [Credits](https://docs.chance.cc/concepts/credits.md): How usage is metered — and how agents top up their own balance. - [The verification harness](https://docs.chance.cc/concepts/harness.md): The independent judge between agent intent and execution. - [Provable verdicts](https://docs.chance.cc/concepts/proofs.md): How every verdict is made tamper-evident, attested, permanent, and independently verifiable — and how you check it yourself. - [Connectors](https://docs.chance.cc/connectors.md): Add Chance verification to Claude, ChatGPT, and the AI platforms — hosted, no local install. - [Escrow wallets](https://docs.chance.cc/escrow.md): A wallet your agent can only move through the harness — every transaction simulated, judged against your rules, and signed only if it passes. - [The verification harness for AI agents](https://docs.chance.cc/index.md): Chance is the independent judge between an agent's intent and its execution — every verdict recorded, attested, and provable. - [MCP server (local)](https://docs.chance.cc/mcp.md): Verification as a tool your agent can call — installed locally via npx. - [Quickstart](https://docs.chance.cc/quickstart.md): From zero to a provable verdict in five minutes. - [Trading agent](https://docs.chance.cc/trader.md): chance-trader-dimes — a local Docker agent that trades Dimes leveraged prediction markets under your mandate-verified gate, with live monitoring in the dashboard. - [AgentCard](https://docs.chance.cc/venues/agentcards.md): Venue-aware verification for AgentCard — pass the exact card spend your agent is about to make, get a verdict bound to those bytes. - [Alchemy](https://docs.chance.cc/venues/alchemy.md): Venue-aware verification for the Alchemy agent stack — pass the exact EVM transaction your agent composed before signing, get a verdict bound to those bytes. - [Dimes](https://docs.chance.cc/venues/dimes.md): Venue-aware verification for Dimes Multiply — pass the exact offer body or vault calldata for a leveraged Polymarket position, get a verdict bound to those bytes. - [Hyperliquid](https://docs.chance.cc/venues/hyperliquid.md): Venue-aware verification for Hyperliquid — pass the exact exchange-endpoint payload, get a verdict bound to those bytes. - [LI.FI](https://docs.chance.cc/venues/lifi.md): Venue-aware verification for LI.FI — pass the exact quote request or route, get a verdict grounded in an independent re-quote, bound to those bytes. - [Limitless](https://docs.chance.cc/venues/limitless.md): Venue-aware verification for Limitless — pass the exact signed CLOB order, get a verdict on the real market and outcome, bound to those bytes. - [Meow](https://docs.chance.cc/venues/meow.md): Venue-aware verification for Meow business banking — pass the exact ACH, wire, or book transfer body, get a verdict bound to those bytes before money moves. - [Myriad Markets](https://docs.chance.cc/venues/myriad.md): Venue-aware verification for Myriad Markets — pass the exact trade quote or signed order-book order, get a verdict on the real market and outcome, bound to those bytes. - [Orderly Network](https://docs.chance.cc/venues/orderly.md): Venue-aware verification for Orderly Network — pass the exact REST payload your agent is about to sign, get a verdict on the real market, size, and leverage, bound to those bytes. - [Polymarket](https://docs.chance.cc/venues/polymarket.md): Venue-aware verification for Polymarket — pass the exact CLOB order, get a verdict on the real market and outcome, bound to those bytes. - [Uniswap](https://docs.chance.cc/venues/uniswap.md): Venue-aware verification for the Uniswap Trading API — quotes and swap transactions judged against your mandate, plus one-call swap preparation from escrow wallets. - [x402](https://docs.chance.cc/venues/x402.md): Verify an x402 payment against your mandate before your agent signs it. - [x402 Verifier](https://docs.chance.cc/x402/verifier.md): Six independent checks on any x402 payment before it's signed: asset integrity, live terms, Coinbase Bazaar reputation, payee profile, signed-payload integrity, and settlement safety. - [Why the agentic economy needs payment verification](https://docs.chance.cc/x402/why-verify.md): x402 removed the friction from machine-to-machine payments. Verification puts back the one piece of friction that was load-bearing: a check before the signature. ## OpenAPI Specs - [openapi](https://docs.chance.cc/openapi.json)