Quickstart - Chance

1. Create an account

Sign in at harness.chance.cc/login. Your account is created with 50 free credits and an embedded wallet — no card required.

2. Create an API key

In the dashboard, click Create API key and copy it.

Your API key (chance_sk_…) is shown only once and is a secret. Store it server-side; never ship it in client code.

3. Verify an intent

Send what the agent is mandated to do (intent) and what it proposes to do (action):

curl -X POST https://harness.chance.cc/api/v1/intent \
  -H "x-api-key: $CHANCE_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{
    "intent": "Only buy favorites priced >= 95c. Reject longshots.",
    "action": "Buy YES on the Will-X-win market @ 21c for $10."
  }'

const res = await fetch("https://harness.chance.cc/api/v1/intent", {
  method: "POST",
  headers: {
    "x-api-key": process.env.CHANCE_API_KEY!,
    "Content-Type": "application/json",
  },
  body: JSON.stringify({
    intent: "Only buy favorites priced >= 95c. Reject longshots.",
    action: "Buy YES on the Will-X-win market @ 21c for $10.",
  }),
});

const { verdict, reasoning, proof } = await res.json();
if (verdict !== "ALLOW") throw new Error(`Blocked: ${reasoning}`);

import os, requests

r = requests.post(
    "https://harness.chance.cc/api/v1/intent",
    headers={"x-api-key": os.environ["CHANCE_API_KEY"]},
    json={
        "intent": "Only buy favorites priced >= 95c. Reject longshots.",
        "action": "Buy YES on the Will-X-win market @ 21c for $10.",
    },
)
print(r.json()["verdict"])  # -> "BLOCK"

4. Act on the verdict

{
  "verdict": "BLOCK",
  "reasoning": "The action buys a 21c longshot, which violates the favorites-only (>= 95c) rule.",
  "proof": {
    "transcriptRoot": "0x…",
    "signature": "0x…",
    "attested": true,
    "anchorTx": "0x…"
  },
  "creditsRemaining": 49
}

Fail-closed: execute only on ALLOW. Treat BLOCK and ESCALATE as do-not-execute.

Next: how the proof works

Every verdict ships with a receipt anyone can re-verify.

​1. Create an account

​2. Create an API key

​3. Verify an intent

​4. Act on the verdict

Next: how the proof works

1. Create an account

2. Create an API key

3. Verify an intent

4. Act on the verdict