{"uid":"cap_NNb6BVb2cHgaS9G8uuqsi","slug":"x402-factory-prediction-market-delta-feed-dea22d5a","name":"x402-factory Prediction Market Delta Feed","description":"Only the materially-moved markets in the segment changed since your cursor (delt — Keyset delta of /v1/board/:category: pass since=<next_cursor from your last call> and get only the materially-moved markets in the segment added or changed after it, plus changed_count and a new next_cursor. Omit since once to bootstrap. Cursors are stable across restarts. Poll the free sibling…","url":"https://x402-factory.com/v1/board/:category/delta","method":"GET","headers":{},"bodySchema":{"type":"object","$schema":"https://json-schema.org/draft/2020-12/schema","required":["input"],"properties":{"input":{"type":"object","required":["type","method"],"properties":{"type":{"type":"string","const":"http"},"method":{"enum":["GET"],"type":"string"},"pathParams":{"type":"object","required":["category"],"properties":{"category":{"enum":["politics-us","politics-world","economics","fed","crypto","sports-nfl","sports-nba","sports-mlb","sports-soccer","entertainment","climate","science-tech"],"type":"string"}}},"queryParams":{"type":"object","required":[],"properties":{"since":{"type":"string","maxLength":300,"minLength":4,"description":"Opaque cursor from a previous next_cursor; omit once to bootstrap a cursor at now"}}}},"additionalProperties":false},"output":{"type":"object","required":["type"],"properties":{"type":{"type":"string"},"example":{"type":"object","required":["data","meta"],"properties":{"data":{"type":"object","required":["rows","changed_count","next_cursor","as_of"],"properties":{"rows":{"type":"array","items":{"type":"object","required":["slug","question","category","p","prev_p","delta","changed_at"],"properties":{"p":{"type":"number","maximum":1,"minimum":0},"slug":{"type":"string"},"delta":{"type":"number"},"prev_p":{"type":"number","maximum":1,"minimum":0},"category":{"type":"string"},"question":{"type":"string"},"changed_at":{"type":"string"}},"additionalProperties":false}},"as_of":{"type":"string"},"next_cursor":{"type":"string"},"changed_count":{"type":"integer","maximum":9007199254740991,"minimum":0}},"additionalProperties":false},"meta":{"type":"object"}}}}}}},"responseSchema":null,"example":null,"exampleRequest":null,"tags":["x402"],"displayCostAmount":"0.015","displayCostAsset":"USDC","priceDynamic":false,"priceHint":null,"priceStatus":"priced","priceSource":"probe","requiresHandshake":false,"reviewCount":0,"rating":{"score":"0.00","successRate":"0.00","reviews":0,"stars":null,"state":"unrated"},"availabilityStatus":"unknown","priceObserved":null,"sessionDeposit":null,"pricing":{"kind":"static","summary":"$0.015/call","primary":{"kind":"static","protocol":"x402","network":"base","amountUsd":"0.015","per":"call","confidence":"exact"},"accepted":[{"kind":"static","protocol":"x402","network":"base","amountUsd":"0.015","per":"call","confidence":"exact"}]},"paymentMethods":[{"uid":"pm_As0gsjUZYjE2A9JIfnvPX","protocol":"x402","methodType":"crypto","chain":"base","mode":"charge","costAmount":"0.015","costPer":"request","priority":0,"asset":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","unit":"request","depositMicros":null,"planRef":null}],"brandName":null,"brandSlug":null,"brandBaseUrl":null,"brandDocsUrl":null,"whatItDoes":"Returns only the materially-moved prediction markets in a given category since a keyset cursor, enabling efficient polling for probability changes","exampleAgentPrompt":"Show me only the prediction markets in the crypto category that have moved since my last check — use cursor abc123xyz from my previous call to get the delta.","exampleUseCases":[{"title":"Monitoring US politics market swings","prompt":"Pull the latest delta for the politics-us prediction markets using my last cursor token so I only get markets that have materially moved since my previous check."},{"title":"Bootstrapping a crypto market tracker","prompt":"I want to start tracking crypto prediction markets — fetch the initial snapshot delta for the crypto category without a since cursor so I can bootstrap my tracking from now."},{"title":"Live sports market movement alerts","prompt":"Check if any NBA prediction markets have significantly changed their probabilities since cursor eyJhb and alert me to any markets where the delta is notable."}],"resultDescription":"A JSON object containing: rows (array of changed markets with slug, question, category, current probability p, previous probability prev_p, probability delta, and changed_at timestamp), changed_count (integer number of changed markets), next_cursor (opaque string for the next poll), and as_of (timestamp of the response).","failureModes":["Invalid or expired cursor returns an error or resets the cursor","Unknown category enum value returns a 400 or 422 validation error","Payment failure (402) if USDC balance is insufficient","No markets changed since cursor returns empty rows array with same next_cursor","Rate limiting if polling too aggressively"],"whenToPreferThis":"Use this endpoint when you need efficient incremental polling of prediction market probability changes for a specific category, rather than fetching the full board on every call. It is ideal for agents that need to react to probability movements without re-processing unchanged markets. Prefer the free sibling board endpoint to bootstrap state, then switch to this delta endpoint for ongoing monitoring.","instructions":null,"reviewSummary":null,"reviewSummaryHighlights":null,"reviewSummaryConcerns":null,"reviewSummaryGeneratedAt":null,"activationCount":0,"lastUsedAt":null,"lastSuccessfullyRanAt":null,"lastHealthCheckAt":"2026-09-14T18:40:52.838Z","isFirstParty":false}