{"uid":"cap_ePWHCBg8oYx3zZ-C468aa","slug":"accelerometer-delta-ai-progress-series-comparison-b641b2b3","name":"Accelerometer Delta — AI-Progress Series Comparison","description":"What changed between two dated snapshots of 129 AI-progress and technology series: per source the from/to values and dates, absolute and % change, and whether a new observation landed. Covers frontier benchmark scores, compute trends, AGI prediction-market odds, model pricing, AI stocks and crypto, energy, space, robotics, research output. Ids are YYYY-MM-DD from the free menu at /. No composite score.","url":"https://x402-accelerometer-feed.fly.dev/delta/:from/:to","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":["from","to"],"properties":{"to":{"type":"string","description":"later reading id"},"from":{"type":"string","description":"earlier reading id"}}},"queryParams":{"type":"object","properties":{}}},"additionalProperties":false},"output":{"type":"object","required":["type"],"properties":{"type":{"type":"string"},"example":{"type":"object","required":["kind","from","to","sources"],"properties":{"to":{"type":"object"},"from":{"type":"object"},"kind":{"type":"string","const":"delta"},"n_moved":{"type":"integer","description":"sources with a newer observation in `to`"},"sources":{"type":"array","items":{"type":"object","properties":{"id":{"type":"string"},"to":{"type":"object"},"from":{"type":["object","null"]},"unit":{"type":"string"},"domain":{"type":"string"},"metric":{"type":"string"},"delta_abs":{"type":["number","null"]},"delta_pct":{"type":["number","null"]},"new_observation":{"type":"boolean"}}}},"composite":{"type":"null"},"n_sources":{"type":"integer"}}}}}}},"responseSchema":null,"example":null,"exampleRequest":null,"tags":["x402"],"displayCostAmount":"0.01","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":"$0.01/call","primary":{"kind":"static","protocol":"x402","network":"base","amountUsd":"0.01","per":"call","confidence":"exact"},"accepted":[{"kind":"static","protocol":"x402","network":"base","amountUsd":"0.01","per":"call","confidence":"exact"}]},"paymentMethods":[{"uid":"pm_ftpnummu7T5A_mVAjTHXY","protocol":"x402","methodType":"crypto","chain":"base","mode":"charge","costAmount":"0.01","costPer":"request","priority":0,"asset":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","unit":"request","depositMicros":null,"planRef":null}],"brandName":null,"brandSlug":null,"brandBaseUrl":null,"brandDocsUrl":null,"whatItDoes":"Returns the absolute and percentage change between two dated snapshots across 129 AI-progress and technology time series, showing per-source from/to values and whether new observations landed","exampleAgentPrompt":"Show me what changed across all 129 AI-progress and technology series between the 2024-06-01 and 2024-12-01 Accelerometer snapshots — I want to see the absolute and percentage deltas per source and which series got new observations.","exampleUseCases":[{"title":"Quarterly AI benchmark progress review","prompt":"Compare the Accelerometer AI-progress snapshots from 2024-01-01 to 2024-04-01 and tell me which frontier benchmark scores moved the most in absolute and percentage terms."},{"title":"AGI market odds shift monitoring","prompt":"What happened to AGI prediction-market odds and AI model pricing between the 2023-12-01 and 2024-06-01 Accelerometer snapshots? Show me the per-source deltas and flag any series that got a fresh observation."},{"title":"Compute and energy trend delta briefing","prompt":"Pull the Accelerometer delta between 2024-03-01 and 2024-09-01 and summarize how compute trends and energy metrics changed — I want absolute change, percent change, and whether any of those series logged a new data point."}],"resultDescription":"A JSON object of kind 'delta' containing: the from and to snapshot identifiers, n_sources (129), n_moved (count of series with a newer observation in the 'to' snapshot), and a 'sources' array where each element includes the series id, domain, metric, unit, from object (value + date), to object (value + date), delta_abs, delta_pct, and a new_observation boolean. The composite field is always null.","failureModes":["Invalid or non-existent snapshot date IDs return an error or empty result — valid IDs must be obtained from the free menu at /","'from' date later than 'to' date may return zero or negative deltas without an explicit error","Payment not included or insufficient (requires $0.01 USDC via x402 protocol) results in a 402 Payment Required response","Network timeout if the fly.dev instance is cold-starting","Missing path parameters (:from or :to) result in a routing error"],"whenToPreferThis":"Use this endpoint when you need to quantify how AI-progress metrics, benchmark scores, compute trends, model pricing, or related technology series have shifted between two specific points in time. It is the right choice when you want per-source breakdowns with both absolute and percentage changes and a flag for newly landed observations. Prefer it over the latest-snapshot or single-snapshot endpoints when your goal is comparative analysis or trend measurement across a time window rather than a point-in-time reading.","instructions":null,"reviewSummary":null,"reviewSummaryHighlights":null,"reviewSummaryConcerns":null,"reviewSummaryGeneratedAt":null,"activationCount":0,"lastUsedAt":null,"lastSuccessfullyRanAt":null,"lastHealthCheckAt":"2026-09-19T12:43:38.879Z","isFirstParty":false}