# Basket Arbitrage Scanner (NO-Outcome Multi-Market)

> Basket Arbitrage Scanner (NO-Outcome Multi-Market) is a paid API for AI agents from oracle.the-undesirables.com, paid per call via x402, $0.5/call, status unknown (last checked 2026-09-15).

Scans prediction markets for basket arbitrage opportunities where buying all NO outcomes across a multi-outcome event guarantees profit.

## Facts

- Endpoint: GET https://oracle.the-undesirables.com/api/v1/arb-basket
- Price: $0.5/call
- Payment: x402
- Status: unknown
- Last checked: 2026-09-15
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/oracle-the-undesirables-com-b2675a09
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_v4RyzShX6Gq6U38wU2MsO

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 oracle-the-undesirables-com-b2675a09
```

Example prompt: Scan for basket arbitrage opportunities right now — specifically where buying all the NO positions across a multi-outcome prediction market event adds up to a guaranteed profit.

## When to prefer this

Use this endpoint when you need to detect basket-style NO-outcome arbitrage specifically — where the sum of all NO prices across outcomes in a single event is less than 1.0, guaranteeing risk-free profit. Prefer this over the cross-platform arbitrage scanner (which compares Polymarket vs Kalshi on YES outcomes) when the opportunity involves multi-outcome exhaustive coverage within a single market event.

## Known failure modes

- No arbitrage opportunities found — empty opportunities array returned
- Market data unavailable or stale — may return partial results
- Payment not completed — 402 response if $0.5 USDC not provided
- Rate limiting or provider downtime — 5xx error
- Market APIs (Polymarket/Kalshi) unreachable — scan may fail or return incomplete data

## How this service works

TCG card grading, conformal risk forecasting, and market intelligence. Powered by x402 micropayments — USDC on Base, USDC on Solana, or USDG on Robinhood Chain; the 402 offers all three and the agent picks a leg. Free tools require no payment. Paid tools return HTTP 402 — sign a payment and retry with the payment proof header.

## Output

Returns a list of detected arbitrage opportunities where aggregating all NO-outcome positions across a multi-outcome market guarantees profit, along with a scan type label and status indicator.

## Example request

```json
{
 "input": {
  "type": "http",
  "method": "GET",
  "queryParams": {}
 }
}
```

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "properties": {
  "properties": {
   "type": "string"
  }
 }
}
```

## Response schema (JSON Schema)

```json
{
 "type": "json",
 "example": {
  "status": "ok",
  "scan_type": "basket",
  "opportunities": [
   {
    "event": "Who will win?",
    "total_no_cost": 6.42,
    "guaranteed_payout": 7
   }
  ]
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/oracle-the-undesirables-com-b2675a09/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from oracle.the-undesirables.com](https://www.zero.xyz/host/oracle.the-undesirables.com/llms.txt)