---
title: "Cross two daily series (aggregates only)"
method: GET
path: "/api/v1/cross-series"
tags: ["History"]
---

# Cross two daily series (aggregates only)

`GET /api/v1/cross-series`

## Request

- Base URL: `https://tradingstrategies.work`
- URL: `https://tradingstrategies.work/api/v1/cross-series`
- Auth: HTTP bearer

Did two market series move together, and what did BTC do next when they agreed or diverged? Crosses two daily series by sign and returns only aggregates: 2x2 table with n per cell (cells under 30 marked thin), co-movement rate, base rate of the next-period BTC move, and per cell share of up-moves and median BTC return against that base rate. Series: btc_price, etf_net_flow, stablecoin_supply, funding_rate. Declared catalog pairs (btc_price x etf_net_flow, btc_price x stablecoin_supply) carry a verdict per cell (binomial test, Bonferroni over declared_catalog_trials); any other pair is exploratory and never carries a verdict. No single quote is returned. Window via `days`: Free and Pro 365d, Power 3650d (aggregates only, so Free gets the full year).

## Query parameters

- `days` integer
- `series_a` 'btc_price' | 'etf_net_flow' | 'stablecoin_supply' | 'funding_rate'
- `series_b` 'btc_price' | 'etf_net_flow' | 'stablecoin_supply' | 'funding_rate'
- `granularity` '1d' | '6d'

## Response `200`

Cross-table container: cells[], base[], agreement_rate, mode/exploratory, declared_catalog_trials, provenance, range and tier echo.

- object

## Other responses

- `400`: Invalid input — fehlt Pflichtfeld oder Wert außerhalb des erlaubten Bereichs.
- `401`: Unauthenticated — kein gültiger Bearer-Token im Authorization-Header.
- `403`: Tier-Insufficient — Endpoint braucht höheren API-Tier. Response enthält upgrade_url.
- `404`: Not-Found — Resource existiert nicht oder gehört nicht dem aktuellen User.
- `429`: Rate-Limit überschritten — Tier-Quota (hourly/daily) oder Per-Endpoint-Quota erreicht. Retry-After-Header gesetzt.
- `500`: Internal Error.
- `503`: Upstream-Failure — Datenquelle nicht erreichbar (Binance, EODHD, etc.).

---

[API](https://skmtc.dev/tradingstrategies/apis/backtesting-arena-public-api.md) · [All operations](https://skmtc.dev/tradingstrategies/apis/backtesting-arena-public-api/llms.txt) · [OpenAPI document](https://skmtc.dev/tradingstrategies/apis/backtesting-arena-public-api/revisions/f82e8d6eecd7?raw)