Real-time SPX (0DTE) options dealer market-structure for agents: call/put walls, gamma flip, net GEX, dealer regime (CHOP/TREND/BREAKOUT), forecast band, VIX term structure, historical replay, and event webhooks. Over MCP (Streamable HTTP) or a REST v1 mirror on one key. Informational data only; not investment advice, and not the Defiance ZDTE ETF.
Scored across 13 tools
Each tool has a distinct role, and the descriptions explicitly carve out boundaries between overlapping reads (get_market_structure vs. get_regime vs. get_day vs. get_regime_segments are nested but clearly labeled as full vs. compact vs. current vs. historical). The auth/billing quartet (create_guest_key, get_access_options, get_credit_balance, create_credit_checkout) is also distinguishable, though a newcomer could momentarily confuse get_access_options with get_credit_balance.
Strict verb_noun snake_case throughout: create_, get_, list_, subscribe_, unsubscribe_. No camelCase or bare-verb deviations.
13 tools is well within a healthy range and each earns a place. However, four of the thirteen are account/auth plumbing (key creation, access options, balance, checkout), which is slightly heavy relative to the seven market-data tools for a market-structure server.
Covers the full lifecycle: free discovery (list_history_dates, get_access_options, get_field_guide), realtime (get_market_structure, get_regime), historical replay (get_day, get_regime_segments), eventing (subscribe/list/unsubscribe_event), and monetization (credit checkout, balance, guest key). No obvious dead ends for the stated domain.
Create a payment link that adds prepaid credits to the authenticated key; a person opens it to pay. Does not charge or fund anything until payment is authorized and confirmed.
Inputs: credits (required).
Creates a zero-credit API key, returned once and not shown again. When the response says connection_authenticated, this MCP session already uses the key; other connections authenticate with an HTTP Authorization: Bearer header. No arguments. For OAuth-capable clients, a Connect prompt appears automatically the first time an account or paid tool is called, with no website account needed, so no key is required.
Inputs: no named parameters.
Free: current prices and the accountless access steps; no website account required.
Inputs: no named parameters.
Free balance check for the API key in this connection's HTTP header; takes no key argument.
Inputs: no named parameters.
The full market-structure history of one past trading day, the larger replay: the intraday timeline (walls, gamma flip, net GEX, regime, spot) plus a day summary. One replay date (YYYY-MM-DD) per call. Data only -- not investment advice or a trade recommendation.
Inputs: date (required).
Static, versioned dictionary of every field this surface emits: unit, value set where the field has a fixed one, and a one-sentence meaning, plus the shared response conventions (tier, delay, timestamps, and how missing data is reported) and a changelog. No inputs; static per version.
Inputs: no named parameters.
The full current SPX dealer market structure, the largest realtime read: walls, gamma flip, net GEX, regime and the strike-level detail below. Current computed SPX dealer market structure (walls, gamma flip, net GEX, regime), recomputed ~every 10s during market hours: scored pressure-point strike ladder, implied 50%/80% forecast-band ranges, strike activity (volume/OI), and VIX term-structure context. Also the 0DTE ATM-straddle expected move and its session fence, max pain, the running session open/high/low with the prior close and gap, order-flow measurements, a top-10 net-GEX strike profile, and chain vanna/charm totals with a top-10 strike ladder. The full realtime structure needs a funded zdte.ai API key (no website account needed); without a key this returns a delayed headline preview (regime, spot, walls, gamma flip, net GEX). Data only -- not investment advice or a trade recommendation.
Inputs: no named parameters.
Only the current SPX dealer regime label and its confidence, a small read for checking whether conditions have changed; no walls, gamma flip, net GEX or strike detail. Realtime with an API key; without a key this serves a delayed preview.
Inputs: no named parameters.
Only how the dealer regime changed during one past trading day, the compact replay: a list of regime segments with their start and end times; no walls, gamma flip, net GEX or spot. One replay date (YYYY-MM-DD) per call.
Inputs: date (required).
Free catalog of available historical SPX market-structure replay dates. No API key required; actual replay datasets are paid.
Inputs: no named parameters.
List this agent's active event subscriptions.
Inputs: no named parameters.
Subscribe a callback URL to a market-structure event (zero_gamma_flip | new_wall | regime_transition). The answer includes signing_secret, shown only once: store it. Each time the event fires, the callback receives an HTTPS POST whose JSON body has id (one per delivered event; ignore a repeat), event, at (ISO 8601 UTC time of the market snapshot the event was seen in), subscription_id and data, the event's values: zero_gamma_flip has gamma_flip and spot, new_wall has which (call_wall or put_wall) and level, regime_transition has from and to. To verify a delivery, read the ZDtE-Signature header, t=,v1=: compute HMAC-SHA256 keyed with signing_secret exactly as returned (its text as bytes; do not hex-decode it) over t, a period and the raw request body, compare it with v1 in constant time, and reject the delivery if t is more than 5 minutes old.
Inputs: event (required), callback_url (required).
Remove an event subscription by its subscription_id (the id returned when the subscription was created).
Inputs: subscription_id (required).
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