openapi: 3.1.0 info: title: PredictionService API version: 1.0.0 security: - WorldMonitorKey: [] - ApiKeyHeader: [] servers: - url: https://api.worldmonitor.app paths: /api/prediction/v1/list-prediction-markets: get: tags: - PredictionService summary: ListPredictionMarkets description: |- ListPredictionMarkets retrieves active prediction markets from seeded market snapshots. Empty markets with fetched_at=0 or data_available=false means the seed snapshot is unavailable/degraded, not that there are confirmed zero markets. operationId: ListPredictionMarkets parameters: - name: page_size in: query description: Maximum items per page (1-100). required: false example: 25 schema: type: integer format: int32 - name: cursor in: query description: |- Cursor for next page. Accepted but currently ignored; no-op until this handler supports the parameter. required: false example: "next-page-token" schema: type: string - name: category in: query description: Optional category filter (e.g., "Politics"). required: false example: "ai" schema: type: string enum: - 'ai' - 'tech' - 'crypto' - 'science' - 'economy' - 'fed' - 'inflation' - 'interest-rates' - 'recession' - 'trade' - 'tariffs' - 'debt-ceiling' - name: query in: query description: Optional search query for market titles. required: false example: "supply chain risk" schema: type: string - name: min_liquidity in: query description: |- Optional minimum liquidity (resting order-book depth in USD). When above 0, only markets with liquidity at or above this value are returned; markets without a liquidity value are dropped. Applied before page_size. required: false example: 1.5 schema: type: number format: double - name: jmespath in: query description: |- Optional JMESPath expression applied server-side to project or reduce the JSON response before it is returned (mirrors the MCP jmespath argument). Invalid expressions, expressions larger than 1024 UTF-8 bytes, or projections that exceed the 256 KB output cap return HTTP 400 with a {_jmespath_error, original_keys} envelope. Grammar and worked examples: https://www.worldmonitor.app/docs/mcp-jmespath. required: false example: "keys(@)" schema: type: string responses: "200": description: Successful response content: application/json: example: "dataAvailable": true "fetchedAt": 1717200000000 "markets": - "category": "cs.AI" "closesAt": 1717200000000 "id": "example-id" "liquidity": 1.5 "source": "MARKET_SOURCE_POLYMARKET" "title": "example" "pagination": "nextCursor": "next-page-token" "totalCount": 1 schema: $ref: '#/components/schemas/ListPredictionMarketsResponse' "400": description: Validation error content: application/json: schema: oneOf: - $ref: '#/components/schemas/ValidationError' - $ref: '#/components/schemas/JmespathProjectionError' "401": description: Missing or invalid API key. content: application/json: schema: $ref: '#/components/schemas/UnauthorizedError' "403": description: API access requires an active subscription (the API key's subscription is inactive or expired). headers: X-Billing-Verification: description: Present when the 403 is a billing-provider-confirmed subscription lapse (value subscription_lapsed, matching the body `code`). schema: type: string content: application/json: schema: $ref: '#/components/schemas/ForbiddenError' "429": description: Rate limit exceeded. headers: X-RateLimit-Limit: description: Maximum requests allowed in the active rate-limit window. schema: type: string X-RateLimit-Remaining: description: Requests remaining in the active rate-limit window. schema: type: string X-RateLimit-Reset: description: Unix epoch milliseconds when the active rate-limit window resets. schema: type: string Retry-After: description: Seconds to wait before retrying the request. schema: type: string content: application/json: schema: oneOf: - $ref: '#/components/schemas/Error' - $ref: '#/components/schemas/RateLimitError' "503": description: Service unavailable. Billing-verification responses include code and X-Billing-Verification; other gateway infrastructure failures use the generic GatewayError shape. headers: Retry-After: description: Seconds to wait before retrying (1-60). schema: type: string X-Billing-Verification: description: Billing-verification state that produced this response (matches the body `code`). schema: type: string X-Validation-Mode: description: Present with value degraded when user API-key validation is temporarily unavailable. schema: type: string X-RateLimit-Mode: description: Present with value degraded when a fail-closed rate-limit dependency is unavailable. schema: type: string content: application/json: schema: oneOf: - $ref: '#/components/schemas/BillingVerificationError' - $ref: '#/components/schemas/GatewayError' default: description: Gateway or handler error response. content: application/json: schema: oneOf: - $ref: '#/components/schemas/Error' - $ref: '#/components/schemas/GatewayError' components: securitySchemes: WorldMonitorKey: type: apiKey in: header name: X-WorldMonitor-Key description: User-issued WorldMonitor API key. ApiKeyHeader: type: apiKey in: header name: X-Api-Key description: Alias header for the WorldMonitor API key (X-WorldMonitor-Key). schemas: JmespathProjectionError: description: Returned when a REST jmespath projection is invalid or exceeds the expression/output byte limits. properties: _jmespath_error: description: Projection error discriminator and details. type: string original_keys: description: Top-level keys or shape of the unprojected response. items: type: string type: array required: - _jmespath_error - original_keys type: object UnauthorizedError: type: object properties: error: type: string description: Human-readable error message. required: - error description: Returned when the API key is missing, malformed, or lacks current API access. Error: type: object properties: message: type: string description: Error message (e.g., 'user not found', 'database connection failed') description: Error is returned when a handler encounters an error. It contains a simple error message that the developer can customize. BillingVerificationError: type: object description: "Returned with HTTP 503 when paid access cannot be confirmed right now: the billing provider is re-verifying a recently expired subscription, or the entitlement backend is unreachable. Retryable — honor Retry-After." properties: error: type: string description: Human-readable billing-verification failure reason. code: type: string enum: - renewal_verification_pending - renewal_verification_failed - entitlement_verification_unavailable description: Machine-readable billing-verification state, mirrored in the X-Billing-Verification response header. requiredTier: type: integer format: int32 description: Minimum entitlement tier required for this endpoint, when the denial came from a tier gate. required: - error - code InvalidRequestBodyError: type: object description: Returned when a JSON POST request body is empty or malformed. properties: message: type: string description: Invalid request body required: - message GatewayError: type: object description: Returned by gateway infrastructure errors before an RPC handler runs, such as origin, routing, method, authentication, or quota checks. properties: error: oneOf: - type: string - type: object additionalProperties: true description: Gateway error reason or structured gateway failure details. required: - error RateLimitError: type: object description: Returned when a gateway or handler rate limit rejects the request. properties: error: type: string description: Human-readable rate-limit failure reason. required: - error ForbiddenError: type: object properties: error: type: string description: Human-readable entitlement failure reason. code: type: string enum: - subscription_lapsed description: Machine-readable denial code, present when the 403 is a billing-provider-confirmed subscription lapse (mirrored in the X-Billing-Verification response header). requiredTier: type: integer format: int32 description: Minimum entitlement tier required for this endpoint. currentTier: type: integer format: int32 description: Caller entitlement tier when known. planKey: type: string description: Caller plan key when known. required: - error description: Returned when a PRO-gated endpoint denies access because the caller has no resolved authenticated user, entitlements cannot be verified, or the caller lacks the required entitlement tier. FieldViolation: type: object properties: field: type: string description: The field path that failed validation (e.g., 'user.email' for nested fields). For header validation, this will be the header name (e.g., 'X-API-Key') description: type: string description: Human-readable description of the validation violation (e.g., 'must be a valid email address', 'required field missing') required: - field - description description: FieldViolation describes a single validation error for a specific field. ValidationError: type: object properties: violations: type: array items: $ref: '#/components/schemas/FieldViolation' description: List of validation violations required: - violations description: ValidationError is returned when request validation fails. It contains a list of field violations describing what went wrong. ListPredictionMarketsRequest: type: object properties: pageSize: type: integer format: int32 description: Maximum items per page (1-100). cursor: type: string description: |- Cursor for next page. Accepted but currently ignored; no-op until this handler supports the parameter. category: type: string description: Optional category filter (e.g., "Politics"). query: type: string description: Optional search query for market titles. minLiquidity: type: number minimum: 0 format: double description: |- Optional minimum liquidity (resting order-book depth in USD). When above 0, only markets with liquidity at or above this value are returned; markets without a liquidity value are dropped. Applied before page_size. description: ListPredictionMarketsRequest specifies filters for retrieving prediction markets. ListPredictionMarketsResponse: type: object properties: markets: type: array items: $ref: '#/components/schemas/PredictionMarket' pagination: $ref: '#/components/schemas/PaginationResponse' fetchedAt: type: integer format: int64 description: |- Time the seed snapshot was fetched, as Unix epoch milliseconds. A value of 0 means the snapshot is unavailable/degraded, not that there are confirmed zero matching markets.. Warning: Values > 2^53 may lose precision in JavaScript dataAvailable: type: boolean description: |- True when markets were evaluated against a seed snapshot. False means an empty payload is graceful degradation because the snapshot is unavailable. description: ListPredictionMarketsResponse contains prediction markets matching the request. PredictionMarket: type: object properties: id: type: string minLength: 1 description: Unique market identifier or slug. title: type: string description: Market question or title. yesPrice: type: number maximum: 1 minimum: 0 format: double description: Current "Yes" price (0.0 to 1.0, representing probability). volume: type: number minimum: 0 format: double description: Trading volume in USD. url: type: string description: URL to the market page. closesAt: type: integer format: int64 description: 'Market close time, as Unix epoch milliseconds. Zero if no expiry.. Warning: Values > 2^53 may lose precision in JavaScript' category: type: string description: Market category (e.g., "Politics", "Crypto", "Sports"). source: type: string enum: - MARKET_SOURCE_UNSPECIFIED - MARKET_SOURCE_POLYMARKET - MARKET_SOURCE_KALSHI description: Source platform for prediction market data. yesPriceChange24h: type: number maximum: 1 minimum: -1 format: double description: Upstream 24-hour Yes price change on the probability scale. Absent if unavailable. yesPriceChange7d: type: number maximum: 1 minimum: -1 format: double description: Upstream 7-day Yes price change on the probability scale. Polymarket only. liquidity: type: number minimum: 0 format: double description: |- Resting order-book depth in USD, measured per venue: Polymarket CLOB liquidity, or the sum of price times size over every Kalshi yes and no bid. Absent when the venue reports none or the order book could not be fetched. required: - id description: PredictionMarket represents a prediction market contract. PaginationResponse: type: object properties: nextCursor: type: string description: Cursor for fetching the next page. Empty string indicates no more pages. totalCount: type: integer format: int32 description: Total count of items matching the query, if known. Zero if the total is unknown. description: PaginationResponse contains pagination metadata returned alongside list results.