---
title: "Get Zero Dte Position Imbalance Signal"
method: GET
path: "/api/signals/advanced/0dte-position-imbalance"
tags: ["Trade Signals"]
---

# Get Zero Dte Position Imbalance Signal

`GET /api/signals/advanced/0dte-position-imbalance`

## Request

- Base URL: `https://api.zerogex.io` (the document declares no server; this is the origin it was published from)
- URL: `https://api.zerogex.io/api/signals/advanced/0dte-position-imbalance`
- Auth: HTTP bearer

Same-day-expiry flow tilt — 0DTE call vs put premium imbalance.

Measures when 0DTE call vs put net premium becomes lopsided enough to
forecast short-term drift from dealer hedging. Falls back to all-expiry
flow when 0DTE data is absent, reflected in `flow_source`.

**Logic highlights** (`src/signals/advanced/zero_dte_position_imbalance.py`):
- Buckets 0DTE flow by moneyness (ATM ±0.5%), weighting OTM most:
  `0.6·OTM_call − 0.6·OTM_put + 0.3·ATM_call − 0.3·ATM_put + 0.1·ITM − ...`
- `flow_imbalance = weighted / total_abs` (gated to 0 below $50k gross).
- Combined = `0.55·flow + 0.30·smart_imbalance + 0.15·pcr_tilt`.
- Multiplied by a time-of-day ramp (stronger near close, zero after hours).
- **Triggered when `|score| ≥ 25` (clamped 0.25).**

**Note on time-gating:** `tod_multiplier` zeros after hours — treat as
"inactive," not "neutral."

**Params:** `symbol` (default `SPY`). Returns 404 when no data exists.

**Returns:**
```json
{
  "score": 31.0, "clamped_score": 0.31, "direction": "bullish",
  "triggered": true,
  "signal": "call_heavy",
  "flow_imbalance": 0.42,
  "smart_imbalance": 0.18,
  "context_values": {"...call_net_premium, put_net_premium, otm_call_net, atm_call_net, otm_put_net, atm_put_net, pcr_tilt, put_call_ratio, tod_multiplier, flow_source..."},
  "score_history": [{"score": 31.0, "timestamp": "..."}, "...up to 90"]
}
```

- `score` — [-100, +100].
- `signal` — `"call_heavy"` | `"put_heavy"` | `"balanced"`.
- `triggered` — `true` when `|score| ≥ 25`.
- `flow_imbalance` — [-1, +1]; bucket-weighted net imbalance.
- `smart_imbalance` — [-1, +1]; smart-money subset.
- `flow_source` (in `context_values`) — `"zero_dte"` | `"all_expiry_fallback"`.

**Trader interpretation:**
- `call_heavy` near close with rising momentum → lean long (dealers short 0DTE calls must chase).
- `put_heavy` near close with falling momentum → lean short.
- Warn when `flow_source == "all_expiry_fallback"`: 0DTE picture is inferred, not measured.

**Page design.** Diverging bar chart with four moneyness buckets (OTM/ATM calls vs OTM/ATM puts).
`flow_source` chip + `tod_multiplier` as a clock/progress indicator.

## Query parameters

- `symbol` string

## Response `200`

Successful Response

- unknown

## Other responses

- `422`: Validation Error

---

[API](https://skmtc.dev/zerogex/apis/zerogex-api.md) · [All operations](https://skmtc.dev/zerogex/apis/zerogex-api/llms.txt) · [OpenAPI document](https://skmtc.dev/zerogex/apis/zerogex-api/revisions/753b26bf0592?raw)