{"id":6672,"date":"2026-01-22T11:17:07","date_gmt":"2026-01-22T11:17:07","guid":{"rendered":"https:\/\/eodhd.com\/financial-academy\/?p=6672"},"modified":"2026-01-22T11:17:08","modified_gmt":"2026-01-22T11:17:08","slug":"a-practical-us-options-api-guide-from-activity-scan-to-key-strikes-via-eodhd-api","status":"publish","type":"post","link":"https:\/\/eodhd.com\/financial-academy\/stock-options\/a-practical-us-options-api-guide-from-activity-scan-to-key-strikes-via-eodhd-api","title":{"rendered":"A Practical US Options API Guide: From Activity Scan to Key Strikes (via EODHD API)"},"content":{"rendered":"\n<p>Option traders rarely need an entire options universe in one shot. What\u2019s usually needed is a fast, repeatable sequence of API calls that mirrors real decision-making:<\/p>\n\n\n\n<ol class=\"wp-block-list\">\n<li>confirm symbol coverage and build a watchlist<\/li>\n\n\n\n<li>detect recent contract activity<\/li>\n\n\n\n<li>load a focused chain slice (expiry window + strike band)<\/li>\n\n\n\n<li>deep-dive a single contract\u2019s history (validation and research)<\/li>\n\n\n\n<li>identify key strikes using open interest concentration<\/li>\n<\/ol>\n\n\n\n<p>All requests below are browser-ready and were executed successfully with real responses (JSON files attached). Full API documentation could be found <a href=\"https:\/\/eodhd.com\/marketplace\/unicornbay\/options\/docs\">here<\/a>.<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"h-1-coverage-and-watchlist-foundation-list-underlyings-with-options-coverage\">1) Coverage and watchlist foundation: list underlyings with options coverage<\/h3>\n\n\n\n<p>Let&#8217;s start with the list of available tickers:<\/p>\n\n\n\n            <div class=\"code__wrapper\">\n                <div class=\"code__content\">\n                    \n<pre class=\"wp-block-code\"><code lang=\"java\" class=\"language-java\">https:\/\/eodhd.com\/api\/mp\/unicornbay\/options\/underlying-symbols?api_token={YOUR_API_TOKEN}\n<\/code><\/pre>\n\n                <\/div>\n                <div class=\"code__btns\">\n                    <button class=\"code__copy\" class=\"copy\" title=\"Copy url\">\n                        <svg class=\"code__copy__icon\" width=\"20\" height=\"20\" viewBox=\"0 0 20 20\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\">\n                            <use xlink:href=\"\/img\/icons\/copy.svg#copy\"><\/use>\n                        <\/svg>\n                        <img decoding=\"async\" class=\"code__copy__approve\" alt=\"\" src=\"\/img\/approve_ico.svg\" loading=\"eager\">\n                    <\/button>\n                <\/div>\n            <\/div>\n        \n\n\n<p>The response included&nbsp;<strong>6423<\/strong> US tickers (January, 2026)<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"h-2-activity-scan-contracts-updated-traded-in-a-time-window\">2) Activity scan: contracts updated\/traded in a time window<\/h3>\n\n\n\n<p>Many trading workflows start with \u201cwhat\u2019s active recently?\u201d This call pulls contracts for a symbol within a time window and includes key trading fields such as&nbsp;last,&nbsp;volume,&nbsp;open_interest,&nbsp;volatility, and the Greeks.<\/p>\n\n\n\n            <div class=\"code__wrapper\">\n                <div class=\"code__content\">\n                    \n<pre class=\"wp-block-code\"><code lang=\"java\" class=\"language-java\">https:\/\/eodhd.com\/api\/mp\/unicornbay\/options\/eod?filter[underlying_symbol]=AAPL&amp;filter[tradetime_from]=2025-02-01&amp;filter[tradetime_to]=2025-04-03&amp;fields[options-eod]=contract,underlying_symbol,type,exp_date,strike,last,volume,open_interest,volatility,delta,gamma,theta,vega,rho,tradetime&amp;sort=strike&amp;page[limit]=25&amp;compact=1&amp;api_token={YOUR_API_TOKEN}\n<\/code><\/pre>\n\n                <\/div>\n                <div class=\"code__btns\">\n                    <button class=\"code__copy\" class=\"copy\" title=\"Copy url\">\n                        <svg class=\"code__copy__icon\" width=\"20\" height=\"20\" viewBox=\"0 0 20 20\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\">\n                            <use xlink:href=\"\/img\/icons\/copy.svg#copy\"><\/use>\n                        <\/svg>\n                        <img decoding=\"async\" class=\"code__copy__approve\" alt=\"\" src=\"\/img\/approve_ico.svg\" loading=\"eager\">\n                    <\/button>\n                <\/div>\n            <\/div>\n        \n\n\n<p><a href=\"https:\/\/eodhd.com\/financial-academy\/wp-content\/uploads\/2026\/01\/request_2.json\">Download JSON response<\/a><br><br>A large set of contracts and metrics for AAPL in the specified window (<strong>meta.total = 88679<\/strong>) including rows with non-zero volume, suitable for building activity screens.<\/p>\n\n\n\n<p>Common uses<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>build \u201crecent activity\u201d feeds per ticker<\/li>\n\n\n\n<li>locally rank by&nbsp;<strong>volume<\/strong>,&nbsp;<strong>open_interest<\/strong>, or&nbsp;<strong>volatility<\/strong>&nbsp;(then drill down)<\/li>\n\n\n\n<li>discover which expirations\/strikes are worth pulling as a chain slice<\/li>\n<\/ul>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"h-3-chain-slice-expiry-window-strike-band\">3) Chain slice: expiry window + strike band<\/h3>\n\n\n\n<p>Pulling a full chain can be heavy. Traders typically look at near expirations and strikes around spot (ATM \u00b1 N strikes). This request does exactly that and returns Greeks, implied volatility, and open interest for fast decision-making.<\/p>\n\n\n\n            <div class=\"code__wrapper\">\n                <div class=\"code__content\">\n                    \n<pre class=\"wp-block-code\"><code lang=\"java\" class=\"language-java\">https:\/\/eodhd.com\/api\/mp\/unicornbay\/options\/contracts?filter[underlying_symbol]=AAPL&amp;filter[exp_date_from]=2025-02-01&amp;filter[exp_date_to]=2025-03-31&amp;filter[strike_from]=150&amp;filter[strike_to]=250&amp;fields[options-contracts]=contract,underlying_symbol,type,exp_date,strike,last,volume,open_interest,volatility,delta,gamma,theta,vega,rho,dte&amp;sort=strike&amp;page[limit]=25&amp;compact=1&amp;api_token={YOUR_API_TOKEN}\n<\/code><\/pre>\n\n                <\/div>\n                <div class=\"code__btns\">\n                    <button class=\"code__copy\" class=\"copy\" title=\"Copy url\">\n                        <svg class=\"code__copy__icon\" width=\"20\" height=\"20\" viewBox=\"0 0 20 20\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\">\n                            <use xlink:href=\"\/img\/icons\/copy.svg#copy\"><\/use>\n                        <\/svg>\n                        <img decoding=\"async\" class=\"code__copy__approve\" alt=\"\" src=\"\/img\/approve_ico.svg\" loading=\"eager\">\n                    <\/button>\n                <\/div>\n            <\/div>\n        \n\n\n<p><a href=\"https:\/\/eodhd.com\/financial-academy\/wp-content\/uploads\/2026\/01\/request_3.json\">Download JSON response<\/a><\/p>\n\n\n\n<p>A manageable subset of the AAPL chain (<strong>meta.total = 558<\/strong>) including both calls and puts, with Greeks and implied volatility.<\/p>\n\n\n\n<p>Common uses<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>build an ATM-focused chain UI<\/li>\n\n\n\n<li>pick strikes by&nbsp;<strong>delta<\/strong>&nbsp;bands (e.g., 0.30 delta)<\/li>\n\n\n\n<li>compare&nbsp;<strong>volatility<\/strong>&nbsp;across strikes to observe skew<\/li>\n\n\n\n<li>select candidate contracts for deeper analysis<\/li>\n<\/ul>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"h-4-single-contract-deep-dive-eod-history-for-one-option-contract\">4) Single-contract deep dive: EOD history for one option contract<\/h3>\n\n\n\n<p>After a candidate contract is identified, the next step is understanding its behavior over time. An EOD series supports monitoring and backtesting: price history, implied volatility shifts, Greek dynamics, and changes in open interest.<\/p>\n\n\n\n<p>Request (contract selected from the chain slice):<\/p>\n\n\n\n            <div class=\"code__wrapper\">\n                <div class=\"code__content\">\n                    \n<pre class=\"wp-block-code\"><code lang=\"java\" class=\"language-java\">https:\/\/eodhd.com\/api\/mp\/unicornbay\/options\/eod?filter[contract]=AAPL250321C00150000&amp;fields[options-eod]=contract,bid_date,open,high,low,last,volume,open_interest,volatility,delta,gamma,theta,vega,rho,tradetime&amp;sort=-exp_date&amp;page[limit]=50&amp;compact=1&amp;api_token={YOUR_API_TOKEN}\n<\/code><\/pre>\n\n                <\/div>\n                <div class=\"code__btns\">\n                    <button class=\"code__copy\" class=\"copy\" title=\"Copy url\">\n                        <svg class=\"code__copy__icon\" width=\"20\" height=\"20\" viewBox=\"0 0 20 20\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\">\n                            <use xlink:href=\"\/img\/icons\/copy.svg#copy\"><\/use>\n                        <\/svg>\n                        <img decoding=\"async\" class=\"code__copy__approve\" alt=\"\" src=\"\/img\/approve_ico.svg\" loading=\"eager\">\n                    <\/button>\n                <\/div>\n            <\/div>\n        \n\n\n<p><a href=\"https:\/\/eodhd.com\/financial-academy\/wp-content\/uploads\/2026\/01\/request_4.json\">Download JSON response<\/a><\/p>\n\n\n\n<p>A time series with timestamps in&nbsp;<strong>bid_date<\/strong>&nbsp;and fields including OHLC,&nbsp;<strong>volume<\/strong>,&nbsp;<strong>open_interest<\/strong>,&nbsp;<strong>volatility<\/strong>, and the Greeks. The executed response returned&nbsp;<strong>meta.total = 289<\/strong>&nbsp;rows.<\/p>\n\n\n\n<p>Common uses<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>track whether&nbsp;<strong>open_interest<\/strong>&nbsp;is building or fading<\/li>\n\n\n\n<li>study implied volatility expansion\/crush (especially around events)<\/li>\n\n\n\n<li>evaluate decay via&nbsp;<strong>theta<\/strong>&nbsp;through time<\/li>\n\n\n\n<li>build backtests for entry\/exit rules based on IV, OI, or Greek thresholds<\/li>\n<\/ul>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"h-5-key-strike-discovery-open-interest-hotspots-for-a-specific-expiry\">5) Key strike discovery: open interest hotspots for a specific expiry<\/h3>\n\n\n\n<p>Open interest concentration helps identify \u201cimportant strikes\u201d where positioning clusters. Traders use these areas for strike selection, liquidity checks, and expiry-related risk assessment (including pin-risk considerations).<\/p>\n\n\n\n            <div class=\"code__wrapper\">\n                <div class=\"code__content\">\n                    \n<pre class=\"wp-block-code\"><code lang=\"java\" class=\"language-java\">https:\/\/eodhd.com\/api\/mp\/unicornbay\/options\/contracts?filter[underlying_symbol]=AAPL&amp;filter[exp_date_eq]=2025-03-21&amp;filter[type]=call&amp;filter[strike_from]=120&amp;filter[strike_to]=220&amp;fields[options-contracts]=contract,underlying_symbol,exp_date,type,strike,last,volume,open_interest,volatility,delta,gamma,theta,vega,rho,dte&amp;sort=strike&amp;page[limit]=200&amp;compact=1&amp;api_token={YOUR_API_TOKEN}\n<\/code><\/pre>\n\n                <\/div>\n                <div class=\"code__btns\">\n                    <button class=\"code__copy\" class=\"copy\" title=\"Copy url\">\n                        <svg class=\"code__copy__icon\" width=\"20\" height=\"20\" viewBox=\"0 0 20 20\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\">\n                            <use xlink:href=\"\/img\/icons\/copy.svg#copy\"><\/use>\n                        <\/svg>\n                        <img decoding=\"async\" class=\"code__copy__approve\" alt=\"\" src=\"\/img\/approve_ico.svg\" loading=\"eager\">\n                    <\/button>\n                <\/div>\n            <\/div>\n        \n\n\n<p><a href=\"https:\/\/eodhd.com\/financial-academy\/wp-content\/uploads\/2026\/01\/request_5.json\">Download JSON response<\/a><\/p>\n\n\n\n<p>A strike-banded set of calls for that expiry (<strong>meta.total = 35<\/strong>) with open interest, implied volatility, and Greeks.<\/p>\n\n\n\n<p>Open interest hotspots in the executed response<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Strike 220:&nbsp;<strong>open_interest = 36823<\/strong><\/li>\n\n\n\n<li>Strike 200:&nbsp;<strong>open_interest = 30635<\/strong><\/li>\n\n\n\n<li>Strike 210:&nbsp;<strong>open_interest = 22476<\/strong><br>Additional notable strikes included 185 (<strong>open_interest = 6756<\/strong>) and 190 (<strong>open_interest = 6543<\/strong>).<\/li>\n<\/ul>\n\n\n\n<p>Common uses<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>identify the most crowded strikes for an expiry<\/li>\n\n\n\n<li>choose spread wings where liquidity and positioning are concentrated<\/li>\n\n\n\n<li>combine open interest with&nbsp;<strong>volume<\/strong>&nbsp;and&nbsp;<strong>volatility<\/strong>&nbsp;to find strikes with both interest and activity<\/li>\n<\/ul>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"h-what-this-sequence-provides-for-options-trading\">What this sequence provides for options trading<\/h2>\n\n\n\n<p>This sequence forms a practical pipeline:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>The coverage call defines the tradable universe and supports watchlists and UI symbol search<\/li>\n\n\n\n<li>The activity window highlights where contracts are updating and where attention may be concentrated<\/li>\n\n\n\n<li>The chain slice provides a tradeable view of strikes\/expirations with Greeks and implied volatility<\/li>\n\n\n\n<li>The contract history supports validation and research by showing how pricing, IV, and Greeks evolved<\/li>\n\n\n\n<li>The open interest hotspot view highlights key strikes for execution and positioning-based context<\/li>\n<\/ul>\n\n\n\n<p>Together, these calls support the most common options tasks: scanning for activity, selecting contracts, understanding risk via Greeks and IV, and choosing strikes informed by open interest distribution.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Option traders rarely need an entire options universe in one shot. What\u2019s usually needed is a fast, repeatable sequence of API calls that mirrors real decision-making: All requests below are browser-ready and were executed successfully with real responses (JSON files attached). Full API documentation could be found here. 1) Coverage and watchlist foundation: list underlyings [&hellip;]<\/p>\n","protected":false},"author":12,"featured_media":6681,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"jetpack_post_was_ever_published":false,"_jetpack_newsletter_access":"","_jetpack_dont_email_post_to_subs":false,"_jetpack_newsletter_tier_id":0,"_jetpack_memberships_contains_paywalled_content":false,"_jetpack_memberships_contains_paid_content":false,"footnotes":""},"categories":[93],"tags":[102,94,100,99],"coding-language":[],"ready-to-go-solution":[],"qualification":[],"financial-apis-category":[],"financial-apis-manuals":[],"class_list":["post-6672","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-stock-options","tag-ask","tag-options","tag-strike","tag-us-stocks","has_thumb"],"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v21.9 (Yoast SEO v26.7) - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>A Practical US Options API Guide: From Activity Scan to Key Strikes (via EODHD API) | EODHD APIs Academy<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/eodhd.com\/financial-academy\/stock-options\/a-practical-us-options-api-guide-from-activity-scan-to-key-strikes-via-eodhd-api\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"A Practical US Options API Guide: From Activity Scan to Key Strikes (via EODHD API)\" \/>\n<meta property=\"og:description\" content=\"Option traders rarely need an entire options universe in one shot. 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