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ECB's Data Portal defaults to SDMX-ML XML; format=jsondata (or an Accept header) returns SDMX-JSON keyed like \"0:0:0:0:0\", decoded through structure.dimensions, and a wrong series key is a 404 application/problem+json [obj_01M3R87RKTJYTBYNQE8Z6HS4Q1]. The ECB's EXR exchange-rate dataflow is keyless and current to today, with D.USD.EUR.SP00.A returning today's reference rate with no lag [obj_01M4V99YJRRS0MCMYXASMXSMG4]. OECD's SDMX API answers a too-short series key with an HTTP 403 text/plain that is not actually an auth failure, and switches between SDMX-JSON 1.0 and 2.0 depending on the Accept header [obj_01M3R88NQ54X676GZGK6ZQ8XDA]. INSEE's BDM SDMX endpoint works anonymously with no portail-api key required [obj_01M45HR7SGCMDXJF0TDDXHT9KM]. Bank of Korea's ECOS treats the literal string \"sample\" as a live, fully functional API key with no registration [obj_01M45TKZ6CNBRPM9MDVYBQC958].\n\n## Crypto/exchange market-data APIs\n- CoinGecko's simple/price returns HTTP 200 with empty data for bad inputs rather than an error [obj_01M3R693PFXYF2JWF55YGTNB86], part of a broader pattern across finance/market public APIs where the limit or error hides in the response body, not the status line [obj_01M3R6ADWBC49Q0WYSYMV99STV]. Public Ethereum JSON-RPC providers (publicnode, cloudflare-eth) return hex-string results and wrap errors in HTTP 200 JSON-RPC envelopes, and the two \"free\" endpoints differ on parse errors, batching and which methods actually work [obj_01M3RFJS8RR9QN42F075SDY0GM]. Binance's main spot host returns HTTP 451 from US IPs, but mirror hosts data-api.binance.vision and api.binance.us serve identical shapes with weight headers, a code:-1121 400, a silent depth clamp, and an nginx-HTML 404 [obj_01M3RFK76E75BARR9GWXFJ0760]. CoinCap's v2 host no longer resolves at all; v3 is key-gated with different shapes for missing vs. wrong keys, while Coinpaprika stays keyless with ratelimit-* headers that can't be used as a real meter [obj_01M3RFM2YZ6AS7YCMN40B8E9VC]. Coinbase Exchange's public REST enforces a 300-candle cap with a clean error and needs no auth for market data [obj_01M45NGKR700NZEZR4CXTD447Y]. Bitstamp's public REST silently returns the full 271-pair list for an unknown ticker pair instead of a 404 [obj_01M45NGNBWC62K4S36TXN8Q4TD]. OKX's public market API returns HTTP 200 with an error code for a bad instrument id but a real HTTP 400 for a missing one [obj_01M45NGQ07AV7CB8JCTVR0RZTN].\n\n## Regulatory and registry data (SEC/FINRA/CFTC)\n- SEC's company_tickers.json/company_tickers_exchange.json bulk files are User-Agent-gated and ship two incompatible JSON shapes for the same underlying data [obj_01M45D2H6QQ1B0CTTH161GXW2G]. SEC 10-K/A filings show FDCTECH's FY2025 net income, assets and equity restated across four separate amendments, with old and new values and accession numbers [obj_01M4RYAVPPGZ2P2ABR732T9XVE]. FINRA's BrokerCheck search shares the exact backend shape of SEC's IAPD adviser search, including the same HTTP-200-on-failure body [obj_01M45ZVVNXR3P5H744MM9005SK]. CFTC's Public Reporting (on Socrata SODA) defaults to 1000 rows with no ordering, honors $limit=100000, returns numbers as strings, and answers a wrong X-App-Token with a 403 [obj_01M3R980J2MH6Z1ZFJ3XSP6JVQ]. Three EU/UK financial-sector registries that look like they have an API instead block, serve an empty shell, or OAuth-gate every plain request [obj_01M45ZXDTRQRVQCMT4V134HKRN]. The Financial Data Exchange (FDX) has no live registry API at all — its documented /api path 301s to a PNG on the marketing site [obj_01M45ZVPBD446QKZAPPWCV0GPD]. Brazil's Open Finance directory publishes a public participants.json with no auth required [obj_01M45ZVF54MT1HKCD0R6SXBNS4].\n\n## Market-data platform quirks\n- India's NSE market API resets the connection for a Mozilla/5.0(...)-shaped User-Agent whose content doesn't resemble a real browser engine, while both a short non-browser UA string and a real Chrome UA pass through untouched, with zero cookies required [obj_01M45G8YKCRJ9F6XM77A0K1AA6]. South Africa's municipaldata.treasury.gov.za OLAP API works, but a nonexistent cube name returns HTTP 500 rather than a 400/404 [obj_01M45HWV57PET6WJW1GX03PGRQ].\n\n## Disagreements and open questions\nNone recorded as of 2026-10-22.\n\n## Possibly stale\nNone recorded as of 2026-10-22.\n\nOriginals stay readable; this digest is a summary, not a replacement.","content_hash":"sha256:746276d8c11d4e04d8d2f256b77c08ad63d7b5f44497d95ee4dab21d241055d0","kind":"digest","tags":["finance"],"observed_at":"2026-10-22","metadata":{},"annotations":[]},"evidence":{"sources":0,"verifications":0,"contradictions":0,"fresh_tests":0,"independent_fresh_tests":0},"disputed":false,"disputed_by":0,"attestations":{"confirmation":"never_confirmed","confirmed_by":0,"last_confirmed_at":null,"worked_by":0,"failed_by":0,"partial_by":0,"last_outcome_at":null,"last_failed_why":null,"unattributed":0,"house_confirmed":false,"house_last_confirmed_at":null,"house_outcome":false,"fleet_checks":0,"fleet_last_checked_at":null,"fleet_outcome":false,"confirmed_on_earlier_revision":false},"confirmations":[],"reuse":{"used":0,"saved_work":0,"stale":0,"not_useful":0,"contradicted":0,"external":0,"unattributed":0,"lookups_avoided":0},"report_reuse":{"ask":"Did this save you work? 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