> ## Documentation Index > Fetch the complete documentation index at: https://crushrewards.dev/docs/llms.txt > Use this file to discover all available pages before exploring further. # Get price history for a product over time > Get historical price observations for a product within a date range. Returns current price, period low/high/avg, trend (rising/falling/stable), good-deal flag, and an observation time-series for charting. Also returns `series`, one row per day at that day's lowest price across the product's entity-matched listings, and `series_summary`, which reads that series: the dated low and high (`min_date`, `max_date`), every day-over-day drop of 5% or more (`drops`), and `change_pct`, the banded like-for-like change over `win` days (best price in the last few days vs best price around `win` days ago; null when the queried range does not reach back that far). These are the numbers the Syntalic dashboards report. Includes a nullable gpc block for the resolved product (fail-soft). ## OpenAPI ````yaml https://api.syntalic.com/openapi.json get /v1/shopper/price-history openapi: 3.1.0 info: title: 'Syntalic — Data Analytics for Agentic Commerce ' version: 1.0.0 contact: name: Syntalic email: support@syntalic.com url: https://syntalic.com description: >- Competitive pricing data across US and Canadian e-commerce retailers (Amazon, Walmart, Target, Best Buy, Home Depot, etc.). Serves price comparisons, deal alerts, brand tracking, promotional intelligence, and market analytics to AI agents via x402 and MPP micropayments. x-guidance: >- This API has three endpoint groups organized by use case: **Shopper endpoints** ($0.01/query): Use these for price comparisons and deal hunting. Start with /v1/shopper/best-price?q= to find the cheapest option across retailers. Use /v1/shopper/deal-finder?category= to find discounted products. Use /v1/shopper/price-drop-alert?q= to check for recent price drops. **Marketing endpoints** ($0.01/query): Use these for competitive analysis. /v1/marketing/competitive-landscape?category= shows all products in a category with pricing. /v1/marketing/brand-tracker?brand= tracks a brand's pricing over time. /v1/marketing/share-of-shelf?category= shows brand market share. **Analyst endpoints** ($0.02/query): Use these for market-level insights. /v1/analyst/inflation?category= shows price trends over time. /v1/analyst/price-dispersion?category= shows price spread across retailers. All endpoints accept an optional 'country' parameter (us or ca, defaults to us). Query parameters use 'q' for free-text search and 'category' for category-level queries. Marketing and analyst responses carry a `meta` block (served_from, freshness_seconds, schema_version) for staleness budgeting and a `resolved` block describing how the category input was matched against the taxonomy. Every response also sends an X-Data-Freshness-Hours header. **Free pre-payment rejection:** requests that cannot be served are rejected BEFORE any payment challenge — invalid params (400 INVALID_PARAMS), retailers that are not serving-eligible (404 RETAILER_NOT_SERVING_ELIGIBLE, with the catalog quality status and the serving_eligible_retailers list in error.details), and shopper queries that resolve to nothing in the catalog (404 NO_RESULTS). You only pay when the API can actually execute your query. Retailer values are case-insensitive (amazon == Amazon). servers: - url: https://api.syntalic.com security: [] paths: /v1/shopper/price-history: get: tags: - Shopper summary: Get price history for a product over time description: >- Get historical price observations for a product within a date range. Returns current price, period low/high/avg, trend (rising/falling/stable), good-deal flag, and an observation time-series for charting. Also returns `series`, one row per day at that day's lowest price across the product's entity-matched listings, and `series_summary`, which reads that series: the dated low and high (`min_date`, `max_date`), every day-over-day drop of 5% or more (`drops`), and `change_pct`, the banded like-for-like change over `win` days (best price in the last few days vs best price around `win` days ago; null when the queried range does not reach back that far). These are the numbers the Syntalic dashboards report. Includes a nullable gpc block for the resolved product (fail-soft). operationId: getPriceHistory parameters: - name: q in: query required: false schema: type: string minLength: 1 description: >- Search query (product name, keyword, or brand + model). Required unless `product_uid` or `entity_uid` is supplied. example: airpods - name: product_uid in: query required: false schema: type: string minLength: 1 description: >- Stable product identifier returned by a prior Syntalic shopper response. When supplied, the endpoint should pin to this listing instead of re-resolving free text. example: p_airpods_deal - name: entity_uid in: query required: false schema: type: string minLength: 1 description: >- Stable cross-retailer entity identifier returned by a prior Syntalic shopper response. When supplied, the endpoint should resolve within the same physical-product entity. example: e_airpods_deal - name: country in: query required: false schema: type: string enum: - us - ca default: us description: Country (us or ca) example: us - name: retailer in: query required: false schema: type: string enum: - amazon - walmart - target - bestbuy - homedepot - costco - ikea - samsclub - cvs - dillards description: >- Filter to a specific retailer platform (long-tail specialty stores are also present; any platform key is accepted) example: amazon - name: time_window in: query required: false schema: type: string enum: - last_30_days - last_60_days - last_90_days - month_to_date - previous_month - month_over_month - quarter_to_date - custom description: >- Historical window preset. Explicit `from`/`to` takes precedence and is reported as `custom`; `time_window=custom` requires both `from` and `to`. Date-only ranges use UTC calendar boundaries with inclusive `from` and exclusive `to`. example: last_60_days - name: from in: query required: false schema: type: string format: date description: Start date (ISO 8601, defaults to 30 days ago) example: '2026-05-01' - name: to in: query required: false schema: type: string format: date description: End date (ISO 8601, defaults to now) example: '2026-06-01' - name: win in: query required: false schema: type: integer enum: - 7 - 30 - 90 default: 30 description: >- Window in days for series_summary.change_pct. Independent of the chart range: set lookback_days (or from) far enough back to cover it. responses: '200': description: Price history content: application/json: schema: type: object properties: query: type: string country: type: string currency: type: string product_uid: type: string entity_uid: type: string product_name: type: string retailer: type: string condition: type: string current_price: type: number period_low: type: number period_high: type: number period_avg: type: number is_good_deal: type: boolean nullable: true trend: type: string nullable: true insufficient_history: type: boolean observation_count: type: integer scope: type: string enum: - entity - listing nullable: true member_count: type: integer nullable: true window: type: object properties: preset: type: string from: type: string format: date to: type: string format: date granularity: type: string nullable: true comparison_from: type: string format: date nullable: true comparison_to: type: string format: date nullable: true timezone: type: string example: UTC additionalProperties: true observations: type: array items: type: object properties: date: type: string format: date price: type: number series: type: array description: One row per day at that day's lowest price, oldest first. items: type: object properties: date: type: string format: date price: type: number series_summary: type: object nullable: true description: >- What the daily-low series says. Null when there is no series. properties: current: type: number min: type: number min_date: type: string format: date max: type: number max_date: type: string format: date change_pct: type: number nullable: true description: >- Banded like-for-like change over change_window_days, in percent. change_window_days: type: integer enum: - 7 - 30 - 90 drops: type: array description: Day-over-day falls of 5% or more. items: type: object properties: date: type: string format: date from_price: type: number to_price: type: number pct: type: number description: Size of the fall, in percent. meta: type: object properties: served_from: type: string freshness_seconds: type: number schema_version: type: string computed_at: type: string format: date-time price_observed_at_min: type: string format: date-time nullable: true price_observed_at_max: type: string format: date-time nullable: true additionalProperties: true '400': description: >- Invalid query parameters or unsupported enum values. Rejected by preflight BEFORE the payment challenge — no payment is requested or charged for malformed requests. content: application/problem+json: schema: type: object required: - type - title - status properties: type: type: string format: uri-reference title: type: string example: Bad Request status: type: integer const: 400 detail: type: string instance: type: string error: type: object properties: code: type: string message: type: string details: type: object additionalProperties: true additionalProperties: true additionalProperties: true '402': description: Payment challenge required before executing paid work content: application/problem+json: schema: type: object required: - type - title - status properties: type: type: string format: uri-reference title: type: string example: Payment Required status: type: integer const: 402 detail: type: string instance: type: string error: type: object properties: code: type: string message: type: string details: type: object additionalProperties: true additionalProperties: true additionalProperties: true '404': description: >- No matching result. error.code distinguishes the cases: NO_RESULTS (the query resolves to nothing in the catalog), RETAILER_NOT_SERVING_ELIGIBLE (the requested retailer exists but is not serving-eligible — error.details carries its catalog quality_status and the serving_eligible_retailers list to retry against), or NOT_PUBLISHED (a social rollup the current publish run does not compute yet — a gap in what we publish, not a finding about the category). Structurally-unservable requests are rejected by preflight before any payment challenge. content: application/problem+json: schema: type: object required: - type - title - status properties: type: type: string format: uri-reference title: type: string example: Not Found status: type: integer const: 404 detail: type: string instance: type: string error: type: object properties: code: type: string message: type: string details: type: object additionalProperties: true additionalProperties: true additionalProperties: true '429': description: Rate limit exceeded content: application/problem+json: schema: type: object required: - type - title - status properties: type: type: string format: uri-reference title: type: string example: Too Many Requests status: type: integer const: 429 detail: type: string instance: type: string error: type: object properties: code: type: string message: type: string details: type: object additionalProperties: true additionalProperties: true additionalProperties: true '500': description: Unexpected server error content: application/problem+json: schema: type: object required: - type - title - status properties: type: type: string format: uri-reference title: type: string example: Internal Server Error status: type: integer const: 500 detail: type: string instance: type: string error: type: object properties: code: type: string message: type: string details: type: object additionalProperties: true additionalProperties: true additionalProperties: true ```` This documentation is built and hosted on [Mintlify](https://mintlify.com), a developer documentation platform.