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Utilities · x402 · early usage

Use this to browse every prediction market Quotient tracks across Polymarket Internatio…

Use this to browse every prediction market Quotient tracks across Polymarket International, Polymarket US, Kalshi, and HL Outcomes, with venue odds and quote provenance, available volume, resolution date, and forecast recency. Polymarket International and Kal…

by quotient-api-gateway.onrender.com · discovered, not yet claimed by its owner · updated 2026-10-14

30d calls18
30d payers5
MethodGET
Outputjson

Mirrored from Coinbase's public x402 Bazaar. The description is the provider's own text and has not been reviewed here; the payment requirements are copied as published.

What it does

Use this to browse every prediction market Quotient tracks across Polymarket International, Polymarket US, Kalshi, and HL Outcomes, with venue odds and quote provenance, available volume, resolution date, and forecast recency. Polymarket International and Kalshi fail closed when live pricing is unavailable; other venues label graph snapshots stale. Filter by venue or topic; the complete covered catalog returns in one response.

Tags: bazaar · payment-identifier

Call contract

Method
GET
Input
query parameters
Output
json
Last paid call
2026-10-14
Input example from Bazaar metadata
{
  "max_forecast_age": 48,
  "sort": "volume_desc",
  "topic": "oil"
}
Output example
{
  "markets": [
    {
      "categories": [
        "Commodities"
      ],
      "clarifications": null,
      "end_date": "2026-08-31T20:00:00Z",
      "event": {
        "id": "KXGOLD-26AUG",
        "slug": null,
        "title": "Gold price in August"
      },
      "forecast_count": 1,
      "inDispute": false,
      "latest_forecast_at": "2026-08-08T14:30:00Z",
      "latest_forecast_delta": 0.03,
      "latest_forecast_id": null,
      "latest_forecast_refresh_reason": "price_move",
      "marketKey": "kalshi:KXGOLD-26AUG-T2500",
      "marketUrl": null,
      "market_odds": 0.46,
      "market_updated_at": "2026-08-08T15:02:11Z",
      "nativeEventId": "KXGOLD-26AUG",
      "nativeMarketId": "KXGOLD-26AUG-T2500",
      "polymarketUrl": null,
      "quality": {
        "assessment_source": null,
        "basis": "binary_accuracy",
        "cohort": {
          "key": "",
          "label": "No comparable record"
        },
        "historical": {
          "accuracy_pct": null,
          "avg_loss_return_pct": null,
          "avg_return_pct": null,
          "avg_win_return_pct": null,
          "benchmark": null,
          "benchmark_improvement_pct": null,
          "drawdown_duplicate_n": 0,
          "drawdown_first_at": null,
          "drawdown_last_at": null,
          "drawdown_missing_n": 0,
          "drawdown_n": 0,
          "drawdown_reason": "no_trade_returns",
          "event_n": 0,
          "first_at": null,
          "in_sample": false,
          "interval_high": null,
          "interval_low": null,
          "last_at": null,
          "loss_return_n": 0,
          "losses": null,
          "max_drawdown_units": null,
          "mean_advantage": null,
          "median_return_pct": null,
          "n": 0,
          "p10_return_pct": null,
          "p90_return_pct": null,
          "price_error_pct": null,
          "reason": "quality_not_computed",
          "return_basis": null,
          "return_n": 0,
          "status": "unavailable",
          "tier": null,
          "voids": null,
          "win_rate_pct": null,
          "win_return_n": 0,
          "wins": null
        },
        "live": {
          "accuracy_pct": null,
          "avg_loss_return_pct": null,
          "avg_return_pct": null,
          "avg_win_return_pct": null,
          "benchmark": null,
          "benchmark_improvement_pct": null,
          "drawdown_duplicate_n": 0,
          "drawdown_first_at": null,
          "drawdown_last_at": null,
          "drawdown_missing_n": 0,
          "drawdown_n": 0,
          "drawdown_reason": "no_trade_returns",
          "event_n": 0,
          "first_at": null,
          "in_sample": false,
          "interval_high": null,
          "interval_low": null,
          "last_at": null,
          "loss_return_n": 0,
          "losses": null,
          "max_drawdown_units": null,
          "mean_advantage": null,
          "median_return_pct": null,
          "n": 0,
          "p10_return_pct": null,
          "p90_return_pct": null,
          "price_error_pct": null,
          "reason": "quality_not_computed",
          "return_basis": null,
          "return_n": 0,
          "status": "unavailable",
          "tier": null,
          "voids": null,
          "win_rate_pct": null,
          "win_return_n": 0,
          "wins": null
        },
        "reason": "quality_not_computed",
        "status": "unavailable",
        "tier": null,
        "updated_at": null,
        "version": "track-record-quality/1"
      },
      "question": "Will gold settle above $2,500 in August?",
      "quotientMarketId": "kalshi:KXGOLD-26AUG-T2500",
      "quotientUrl": "https://quotient.social/markets/kalshi%3AKXGOLD-26AUG-T2500",
      "return_record": null,
      "seriesTicker": "KXGOLD",
      "signal_count": 0,
      "slug": null,
      "sourceUrl": null,
      "sports": null,
      "tags": [
        "Commodities",
        "Metals",
        "Gold"
      ],
      "venue": "kalshi",
      "venue_quote": {
        "freshness": "verified",
        "market_id": "KXGOLD-26AUG-T2500",
        "observed_at": "2026-08-31T12:00:00Z",
        "quote_method": "midpoint",
        "schema_version": "1",
        "selected_probability": 0.46,
        "venue": "kalshi",
        "venue_timestamp": "2026-08-31T12:00:00Z",
        "yes_ask": 0.46,
        "yes_bid": 0.46,
        "yes_last": null
      },
      "volume_24h": null
    },
    {
      "categories": [
        "Sports"
      ],
      "clarifications": null,
      "end_date": "2026-10-11T17:00:00Z",
      "event": {
        "id": "KXNFLGAME-26SEP27ATLGB",
        "slug": null,
        "title": "Atlanta vs Green Bay"
      },
      "forecast_count": 1,
      "inDispute": false,
      "latest_forecast_at": "2026-09-26T14:05:00Z",
      "latest_forecast_delta": null,
      "latest_forecast_id": null,
      "latest_forecast_refresh_reason": null,
      "marketKey": "kalshi:KXNFLGAME-26SEP27ATLGB-GB",
      "marketUrl": null,
      "market_odds": 0.64,
      "market_updated_at": "2026-09-26T15:02:11Z",
      "nativeEventId": "KXNFLGAME-26SEP27ATLGB",
      "nativeMarketId": "KXNFLGAME-26SEP27ATLGB-GB",
      "polymarketUrl": null,
      "quality": {
        "assessment_source": null,
        "basis": "binary_accuracy",
        "cohort": {
          "key": "",
          "label": "No comparable record"
        },
        "historical": {
          "accuracy_pct": null,
          "avg_loss_return_pct": null,
          "avg_return_pct": null,
          "avg_win_return_pct": null,
          "benchmark": null,
          "benchmark_improvement_pct": null,
          "drawdown_duplicate_n": 0,
          "drawdown_first_at": null,
          "drawdown_last_at": null,
          "drawdown_missing_n": 0,
          "drawdown_n": 0,
          "drawdown_reason": "no_trade_returns",
          "event_n": 0,
          "first_at": null,
          "in_sample": false,
          "interval_high": null,
          "interval_low": null,
          "last_at": null,
          "loss_return_n": 0,
          "losses": null,
          "max_drawdown_units": null,
          "mean_advantage": null,
          "median_return_pct": null,
          "n": 0,
          "p10_return_pct": null,
          "p90_return_pct": null,
          "price_error_pct": null,
          "reason": "quality_not_computed",
          "return_basis": null,
          "return_n": 0,
          "status": "unavailable",
          "tier": null,
          "voids": null,
          "win_rate_pct": null,
          "win_return_n": 0,
          "wins": null
        },
        "live": {
          "accuracy_pct": null,
          "avg_loss_return_pct": null,
          "avg_return_pct": null,
          "avg_win_return_pct": null,
          "benchmark": null,
          "benchmark_improvement_pct": null,
          "drawdown_duplicate_n": 0,
          "drawdown_first_at": null,
          "drawdown_last_at": null,
          "drawdown_missing_n": 0,
          "drawdown_n": 0,
          "drawdown_reason": "no_trade_returns",
          "event_n": 0,
          "first_at": null,
          "in_sample": false,
          "interval_high": null,
          "interval_low": null,
          "last_at": null,
          "loss_return_n": 0,
          "losses": null,
          "max_drawdown_units": null,
          "mean_advantage": null,
          "median_return_pct": null,
          "n": 0,
          "p10_return_pct": null,
          "p90_return_pct": null,
          "price_error_pct": null,
          "reason": "quality_not_computed",
          "return_basis": null,
          "return_n": 0,
          "status": "unavailable",
          "tier": null,
          "voids": null,
          "win_rate_pct": null,
          "win_return_n": 0,
          "wins": null
        },
        "reason": "quality_not_computed",
        "status": "unavailable",
        "tier": null,
        "updated_at": null,
        "version": "track-record-quality/1"
      },
      "question": "Atlanta vs Green Bay Winner?",
      "quotientMarketId": "kalshi:KXNFLGAME-26SEP27ATLGB-GB",
      "quotientUrl": "https://quotient.social/markets/kalshi%3AKXNFLGAME-26SEP27ATLGB-GB",
      "return_record": null,
      "seriesTicker": "KXNFLGAME",
      "signal_count": 0,
      "slug": null,
      "sourceUrl": null,
      "sports": {
        "game_key": "nfl|atl|gb|20260927T1700",
        "game_title": "Atlanta vs Green Bay",
        "kickoff_at": "2026-09-27T17:00:00.000Z",
        "league": "nfl",
        "sport": "football",
        "yes_side": {
          "code": "gb",
          "name": "Packers"
        }
      },
      "tags": [],
      "venue": "kalshi",
      "venue_quote": {
        "freshness": "verified",
        "market_id": "KXNFLGAME-26SEP27ATLGB-GB",
        "observed_at": "2026-08-31T12:00:00Z",
        "quote_method": "midpoint",
        "schema_version": "1",
        "selected_probability": 0.64,
        "venue": "kalshi",
        "venue_timestamp": "2026-08-31T12:00:00Z",
        "yes_ask": 0.64,
        "yes_bid": 0.64,
        "yes_last": null
      },
      "volume_24h": null
    }
  ],
  "venue_facets": [
    {
      "count": 2,
      "venue": "kalshi"
    }
  ]
}

Use with an agent

  1. Discover. Agents find this listing with GET https://bazaar.saylorinnovations.com/discovery/search?query=…, the MCP tool search_resources, or /discovery/resources.
  2. Inspect. Fetch /resources/29019.json for the price and payment options.
  3. Pay. Call GET https://quotient-api-gateway.onrender.com/api/v1/markets. The provider answers 402 with its payment requirements. An x402 client signs one of the options below and retries with PAYMENT-SIGNATURE.
  4. Execute. The provider returns 200 with the data. Agent Bazaar is not in the request path and never sees your payment.

For humans

You don't need an account or an API key; you need a wallet holding a small amount of USDC on Base, and an x402-capable client (see the examples below). Call the endpoint unpaid first to see exactly what it asks for.

Pricing & payment

Price
$0.005 / request
Protocol
x402 v2
Auth
No account or API key. Pay per request.
Networks
Base
Demand
18 calls · 5 unique payers in 30d (public x402 Bazaar data)

x402 payment requirements

SchemeNetworkAssetAmountPay toTimeout
exactBase
eip155:8453		USDC$0.0050xC3d01FD2F79d4c57aD106AB8ecc12a5dE24F97cB300s
accepts[] (raw JSON)
[
  {
    "scheme": "exact",
    "network": "eip155:8453",
    "payTo": "0xC3d01FD2F79d4c57aD106AB8ecc12a5dE24F97cB",
    "asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
    "amount": "5000",
    "amountUsd": 0.005,
    "maxTimeoutSeconds": 300
  }
]

Schemas

Output schema (JSON Schema)
{
  "properties": {
    "example": {
      "type": "object"
    },
    "type": {
      "type": "string"
    }
  },
  "required": [
    "type"
  ],
  "type": "object"
}
Example shape — generated from the schema, not a captured live response
{
  "example": {},
  "type": "string"
}

Examples

curl
curl "https://quotient-api-gateway.onrender.com/api/v1/markets"
# -> 402 Payment Required, accepts[] lists how to pay
# retry with a PAYMENT-SIGNATURE (or PAYMENT header) once paid
JavaScript
const res = await fetch("https://quotient-api-gateway.onrender.com/api/v1/markets");
if (res.status === 402) {
  const { accepts } = await res.json();
  // pay one of accepts[] via an x402 client, then retry with the payment header
}
Python
import httpx
res = httpx.get("https://quotient-api-gateway.onrender.com/api/v1/markets")
if res.status_code == 402:
    accepts = res.json()["accepts"]
    # pay one of accepts[] via an x402 client, then retry with the payment header

Details

Provider
quotient-api-gateway.onrender.com
Endpoint
https://quotient-api-gateway.onrender.com/api/v1/markets
Machine-readable
/resources/29019.json