{"key":"market-data-api-comparison","generated_at":1789413551.045492,"calculated_at":1789413551.045492,"updated":1789413551.045492,"source_observed_at":1789413551.045492,"observation_start":null,"observation_end":null,"temporal_start":null,"temporal_end":null,"source_interval":"reference","calculation_refresh_seconds":86400,"source_refresh_seconds":86400,"refresh_seconds":86400,"stale":false,"source":"Named provider documentation and CoinNudge public contracts","window":"Documentation checked 2026-09-14","limitation":"This is a documented data-model comparison, not a completeness, latency, price, SLA, redistribution-rights or provider-quality benchmark. Plans and endpoints change; verify official documentation and contract terms before purchase.","calculation_version":"documented-api-capability-comparison-2.0","evidence_columns":[["provider","Provider"],["data_model","Data model"],["authentication","Authentication"],["historical_delivery","Historical delivery"],["time_semantics","Time / version semantics"],["evaluation_path","Evaluation path"],["contract_boundary","Contract boundary"],["verified_at","Docs checked"]],"metric_cards":[["4","provider models compared"],["4","selection dimensions"],["60/min","CoinNudge public Research limit"],["No","single universal winner"]],"summary":{"answer":"This is a narrow comparison of four data-delivery models—not a universal 'best API' ranking. Choose among processed event evidence, broad market discovery, exchange-native replay and institutional normalized feeds according to the research output you must reproduce."},"items":[{"provider":"CoinNudge","data_model":"Processed evidence and event studies","authentication":"API key; public Research limit 60/min","historical_delivery":"Scoped JSON, CSV and Parquet releases","time_semantics":"event / observed / ingested timestamps plus release hashes","evaluation_path":"Public Research JSON/CSV and sample page","contract_boundary":"Coverage and commercial rights depend on selected dataset","verified_at":"2026-09-14","calculation_version":"documented-api-capability-comparison-2.0"},{"provider":"CoinGecko","data_model":"Broad asset metadata and normalized market discovery","authentication":"Demo or Pro API key required","historical_delivery":"Plan-dependent REST history","time_semantics":"Endpoint-specific market timestamps; PIT not evaluated here","evaluation_path":"Demo account/key and official documentation","contract_boundary":"Rate limits and historical depth are plan-dependent","verified_at":"2026-09-14","calculation_version":"documented-api-capability-comparison-2.0"},{"provider":"Tardis.dev","data_model":"Exchange-native messages, files and replay","authentication":"API key for documented download/replay access","historical_delivery":"Files and exchange-format replay","time_semantics":"Exchange and local timestamp fields vary by format","evaluation_path":"Official docs and documented sample access","contract_boundary":"Users derive their own research evidence; venue depth varies","verified_at":"2026-09-14","calculation_version":"documented-api-capability-comparison-2.0"},{"provider":"Kaiko","data_model":"Institutional normalized market-data products","authentication":"Commercial API credentials","historical_delivery":"Product-dependent historical endpoints","time_semantics":"Data-version parameter on supported endpoints","evaluation_path":"Public documentation; commercial evaluation varies","contract_boundary":"Product, SLA and redistribution rights are contract-dependent","verified_at":"2026-09-14","calculation_version":"documented-api-capability-comparison-2.0"}],"observations":[],"health":[]}