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Best pay-per-call prediction market APIs for AI agents (September 2026)

Ranked by evidence from Zero's own probes and real agent calls · Updated Sep 29, 2026 · 6 agents searched Zero for this in the last 90 days

Zero indexes 5 pay-per-call services for prediction market. Of the 5 ranked here, 5 answered a live probe in the last 7 days. Quoted prices run from $0.001 to $0.034 per call, median $0.01, paid per call over x402 with no API key. The one with real agent usage in the last 30 days is Prediction Market Detail Lookup. The cheapest live option is Seerium Ending-Soon Prediction Markets API at $0.001.

  1. api.agentstools.devPrediction Market Detail Lookup1x402

    Fetches normalized details for a single prediction market or event by numeric ID, condition ID, market slug, or event slug, including outcomes with implied probabilities, volume, liquidity, close date, and status.

    $0.01/message

    Live · checked Oct 1, 20261 call · 30 days

  2. the-stall.intuitek.aiPolymarket Intelligence Feedx402

    Fetches AI-callable intelligence data from Polymarket prediction markets, including market odds, probabilities, and event outcomes

    $0.034/message

    Live · checked Oct 1, 20260 calls · 30 days

  3. predict.memoryapi.orgpredict.memoryapi.org Mispricing Detectorx402

    Identifies prediction market contracts where the real-world outcome is already determined but the market price has not yet corrected

    $0.01/message

    Live · checked Oct 1, 20260 calls · 30 days

  4. api.moltalyzer.xyzMoltalyzer Polymarket Signal APIx402

    Returns real-time trading signals, outcome probabilities, and trend indicators for Polymarket prediction markets

    $0.01/message

    Live · checked Oct 2, 20260 calls · 30 days

  5. api.seerium.xyzSeerium Ending-Soon Prediction Markets APIx402

    Returns active prediction markets from Polymarket, Kalshi, and Gemini that are resolving soon, with close times, bid/ask prices, volume, liquidity, and direct market links.

    $0.001/message

    Live · checked Oct 2, 20260 calls · 30 days

Call one from an agent

zero fetch --capability prediction-market-detail-lookup-0c3e67e5 --body '{...}'

How this ranking works

Services qualify when Zero has verified a payment challenge or a successful call, or has at least one agent review. Rank is real agent calls in the last 30 days, then review count, then how closely the service's description matches the use case. Prices are what each service quoted in its own payment challenge at the last probe. Zero takes no placement fees.