{"uid":"cap_OD_z6d2NEziZ9DXTBW4pr","slug":"accelerometer-ai-progress-delta-feed-x402-4e030f35","name":"Accelerometer AI-Progress Delta Feed (x402)","description":"Timestamped per-source snapshots of 129 public AI-progress and technology time series (frontier benchmark scores, compute trends, AGI prediction-market odds, model pricing, AI stocks and crypto, energy, space, robotics, biomed, research output). No composite score. Paid with USDC on Base via x402.","url":"https://x402-accelerometer-feed.fly.dev/delta/%7Bfrom%7D/%7Bto%7D","method":"GET","headers":{},"bodySchema":{"type":"object","properties":{"properties":{"type":"string"}}},"responseSchema":{"type":"json","example":{"to":{"run_at":"2026-09-16T12:25:28.530204+00:00","snapshot_id":"2026-09-16"},"from":{"run_at":"2026-07-12T14:00:05.754191+00:00","snapshot_id":"2026-07-12"},"kind":"delta","n_moved":76,"sources":[{"id":"agents.x402_services_count","to":{"date":"2026-09-16","value":2865},"from":{"date":"2026-07-12","value":1779},"unit":"count","domain":"agents","metric":"x402 pay-per-request services (agentic.market)","delta_abs":1086,"delta_pct":61.0455,"new_observation":true},{"id":"autonomy.metr_time_horizon_50","to":{"date":"2025-04-16","value":112.230447},"from":{"date":"2025-04-16","value":112.230447},"unit":"minutes","domain":"autonomy","metric":"METR frontier task-completion horizon @50% (minutes)","delta_abs":0,"delta_pct":0,"new_observation":false}],"composite":null,"n_sources":129,"schema_version":"0.2"}},"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_-wpg4TDuzoWymLBAhfwJk","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 per-source changes across 129 AI-progress and technology time series between two dated snapshots, paid via x402/USDC.","exampleAgentPrompt":"Show me what changed across the 129 AI-progress and technology time series between July 12 2026 and September 16 2026 — I want to see which metrics moved and by how much.","exampleUseCases":[{"title":"Quarterly AI benchmark progress review","prompt":"What changed in the Accelerometer's AI-progress time series between April 1 2026 and July 1 2026? I want to see which frontier benchmark scores and compute metrics moved the most."},{"title":"AGI prediction market shift tracker","prompt":"Pull the delta on all 129 AI-progress series from January 15 2026 to June 15 2026 — I'm specifically interested in how AGI prediction market odds and model pricing changed over that period."},{"title":"Agentic services growth measurement","prompt":"How many new x402 pay-per-request agentic services appeared between August 1 2026 and September 16 2026? Get me the full delta snapshot so I can see the growth numbers."}],"resultDescription":"A JSON object containing two snapshot references (from/to run timestamps and snapshot IDs), the count of series that moved (n_moved), and an array of per-source records each with absolute and percentage delta, the from/to values and dates, unit, domain, metric label, and a flag indicating whether a new observation was added. The composite field is always null (no composite score). Total series count is 129.","failureModes":["Invalid or non-existent snapshot date IDs return an error or empty result","Date range with no available snapshots yields zero moved series","Network timeout on the fly.dev host","x402 payment failure if USDC balance on Base is insufficient","Malformed date format in {from} or {to} path parameters causes a request error","Future dates beyond available snapshot range return no data"],"whenToPreferThis":"Choose this endpoint when you need to quantify change — not just current state — across AI-progress metrics between two specific dates. It is the right choice for trend analysis, progress reports, anomaly detection, and tracking specific series like benchmark scores, compute costs, model pricing, or prediction market odds over a defined interval. Prefer the latest-snapshot sibling endpoint if you only need current values, or the specific-date sibling if you want a full snapshot without diffing.","instructions":null,"reviewSummary":null,"reviewSummaryHighlights":null,"reviewSummaryConcerns":null,"reviewSummaryGeneratedAt":null,"activationCount":0,"lastUsedAt":null,"lastSuccessfullyRanAt":null,"lastHealthCheckAt":"2026-09-19T06:39:58.172Z","isFirstParty":false}