AWS Spot Prices

Linux EC2 spot history + on-demand list prices

Open chart Latest prices (JSON) OpenAPI /docs Health

This service stores spot price-change events (not a fixed 5-minute grid). Each series is one instance type in one availability zone: region/availability_zone/instance_type. It also stores Linux on-demand list prices per region and instance type (from AWS’s public price list) so you can compare spot vs on-demand in the chart tooltip.

Quick start

GET/aws/chart

Interactive chart — see Using the chart below for the full UI tour.

GET/aws/latest/cheapest?instance_type=g5.2xlarge

Cheapest current spot for one instance type across all tracked regions/AZs.

curl -sS "$BASE/aws/latest/cheapest?instance_type=g5.2xlarge"

Using the chart

Open /aws/chart. Each line is one instance type in one availability zone (label looks like g5.2xlarge @ us-east-1a). Filter panels start collapsed — expand the section you need. Filters stack: type groups → family → instance type → region → series (fine-tune).

Type groups (purple): Quick picks: GPU, K8s low density, K8s high density, etc. One click sets the instance-type filter to every type in that group. Click again to clear.
Instance family (amber): Quick picks by AWS family prefix: g5, inf2, g4ad, p3, etc. Shows every size in that family (e.g. all g5.* types). Combines with other filters. GPU families are highlighted like the GPU group button.
Applied filters (top of sidebar): Shows which type and region filters are active (any when a box is empty). Counts how many series are hidden and why — e.g. 87 hidden (45 by instance type · 30 by region · 12 by series checkbox).
Instance type (green): Check one or more types (e.g. p3.2xlarge) to plot that type in every region and AZ you track. Leave all unchecked for no type limit. All types / Clear set or remove this filter. Each row has a tiny only button to select just that type and clear the rest.
Region (cyan): Check a region (e.g. us-west-2) to plot every instance type in that region (all AZs). Combine with instance type to narrow further — e.g. only p3.2xlarge lines in us-west-2. Leave all unchecked for no region limit. only works the same as in instance type.
Series — type + AZ (pink): Lists only lines that match the type and region filters above. Uncheck a row to hide that AZ. All listed / None listed toggle every row in the current list (not the whole dataset). only shows just that one AZ line.
Click a line on the graph: Focus that series: thicker line, colored dots at each spot price point (so you know where to hover), other lines fade. While focused, tooltips appear only on the clicked line — dimmed lines are ignored. Click the same line again to clear focus, or use Reset all filters.
Hover · pan · zoom: With no line focused, hover any line for a tooltip: type, AZ, region, time (UTC), spot $/hr, and on-demand $/hr when available (region-level list price at or before that spot sample). After you click to focus, only that line shows tooltips. Drag to pan, scroll to zoom. On-demand is never drawn as a separate line.
Counts: Under Applied filters: how many lines are on the chart and how many were hidden by each filter. Filter checkbox choices stay in your browser if you reload.

All GPU spot lines: Type groups → GPU, or API GET /aws/latest?group=gpu.
All g5 sizes: Instance family → g5, or API GET /aws/latest?family=g5.
One type only: Instance type → only on p4d.24xlarge (or check the type manually).
One region, all types: Region → only on us-west-2.
Both: Type p3.2xlarge + region us-west-2; series panel to drop one AZ.
Inspect a dip: Click a line (dots appear), hover a point for spot vs on-demand; click again to unfocus.

The chart loads the last 2 days first and draws each series as it streams in, then fetches full history in the background (GET /aws/api/history?since=… then GET /aws/api/history). Filters are ANDed: type ∩ region ∩ series checkboxes.

On-demand list prices

On-demand data is region + instance type only (not per AZ). Source: AWS public price list (pricing.us-east-1.amazonaws.com) — Linux, shared tenancy, standard BoxUsage — no EC2 API or extra IAM permissions.

Daily sync — Kubernetes CronJob spot-on-demand-sync runs collector.py --on-demand-once and records the current publication.
90-day backfill — optional Job/CronJob spot-on-demand-backfill imports monthly offer snapshots whose effective date falls in the last 90 days (same window as spot history). Re-run with --on-demand-backfill-force if needed.
AWS does not publish daily on-demand history; until daily syncs accumulate, tooltips may only show on-demand near monthly publication dates.

On-demand rows older than 90 days are pruned automatically. If tooltips show spot only, run the on-demand sync/backfill jobs once after deploy.

Series identity

Series IDs look like:

us-east-1/us-east-1a/g5.2xlarge

In URLs you can use slashes or pipe separators:

/aws/series/us-east-1|us-east-1a|g5.2xlarge/history

Instance type groups

Groups are defined in config.yaml (instance_types_gpu, instance_types_kubernetes_low_density, instance_types_kubernetes_high_density, …). Families are derived from configured types (g5.2xlarge → family g5). GPU types can be extended via SPOT_GPU_INSTANCE_TYPES on the server pod.

GET/aws/groups

instance_type_groups, instance_type_families, gpu_instance_types, group_labels, regions.

curl -sS "$BASE/aws/groups"

Filter with group, family (repeat either for unions within that dimension), gpu_only=true, and/or instance_type — all intersected.

All endpoints

Each response is JSON unless noted. Query params can be repeated where noted.

GET/health

Liveness probe.

curl -sS "$BASE/health"

GET/aws/summary

series_count, updated_at, database — no per-series payload.

curl -sS "$BASE/aws/summary"

GET/aws/

Full snapshot: latest price per series plus instance_types, instance_type_groups, gpu_instance_types, group_labels, updated_at. Each series includes is_gpu.

curl -sS "$BASE/aws/"

GET/aws/chart/config

Alias for /aws/groups (used by the chart UI).

curl -sS "$BASE/aws/chart/config"

GET/aws/latest

Latest prices with server-side filter, sort, and limit.

group — repeat: gpu, kubernetes_low_density, kubernetes_high_density, …
family — repeat: g5, inf2, g4ad, …
gpu_only — true for GPU types only
instance_type — repeat to filter types (intersects with group/family/gpu)
region — repeat to filter regions
availability_zone — repeat to filter AZs
sort — price, recorded_at, region, availability_zone, instance_type, id
order — asc or desc
limit — max rows (1–10000)

curl -sS "$BASE/aws/latest?group=gpu&sort=price&order=asc"

curl -sS "$BASE/aws/latest?family=g5&family=inf2"

curl -sS "$BASE/aws/latest?gpu_only=true&region=us-west-2"

curl -sS "$BASE/aws/latest?instance_type=g5.2xlarge&sort=price&order=asc"

GET/aws/latest/cheapest

Cheapest series right now. Provide exactly one of instance_type, group, or family. Optional region, gpu_only.

curl -sS "$BASE/aws/latest/cheapest?instance_type=g5.2xlarge"

curl -sS "$BASE/aws/latest/cheapest?group=gpu&region=us-east-1"

curl -sS "$BASE/aws/latest/cheapest?family=g5"

GET/aws/series

Flat list of series IDs (no prices).

curl -sS "$BASE/aws/series"

GET/aws/series/count

{"count": N} — distinct series in the database.

curl -sS "$BASE/aws/series/count"

GET/aws/series/{series_key}/history

JSON time series for one AZ + instance type. Includes point_count.

since — optional ISO8601 lower bound
limit — optional max points (1–100000), most recent N if set

Series key: slashes or pipes — us-east-1/us-east-1a/g5.2xlarge

curl -sS "$BASE/aws/series/us-east-1/us-east-1a/g5.2xlarge/history?since=2026-05-01T00:00:00Z"

curl -sS "$BASE/aws/series/us-east-1/us-east-1a/g5.2xlarge/history?limit=100"

GET/aws/series/{series_key}/history/tsv

Tab-separated recorded_at and price_usd_per_hour (same query params as history).

curl -sS "$BASE/aws/series/us-east-1/us-east-1a/g5.2xlarge/history/tsv"

GET/aws/series/{series_key}/csv

OHLC-style CSV download (Open/High/Low/Close = price, Volume = 0) for Fidelity / strawberry-market import.

curl -sS "$BASE/aws/series/us-east-1/us-east-1a/g5.2xlarge/csv" -o g5-us-east-1a.csv

GET/aws/api/history/meta

Per-series point_count, is_gpu, labels — no price arrays. Optional since, group, family, gpu_only, instance_type.

curl -sS "$BASE/aws/api/history/meta?group=gpu"

curl -sS "$BASE/aws/api/history/meta?family=inf2"

curl -sS "$BASE/aws/api/history/meta?since=2026-05-25T00:00:00Z&gpu_only=true"

GET/aws/api/history

Bulk history (chart shape). Optional since, group, family, gpu_only, instance_type. Each series includes parallel arrays timestamps, prices (spot), and on_demand_hover (strings for the chart tooltip, e.g. On-demand: $1.2120/hr, or empty when unknown).

curl -sS "$BASE/aws/api/history?since=2026-05-01T00:00:00Z&group=kubernetes_low_density"

curl -sS "$BASE/aws/api/history?family=g5"

curl -sS "$BASE/aws/api/history?instance_type=g5.2xlarge" | jq '.series[0] | {id, on_demand_hover: .on_demand_hover[0:3]}'

GET/aws/chart

Interactive chart UI (loads 2 days first, then full history; series draw as they stream in).

Base URL: Replace $BASE with your server root. It is TLS only: https://spotplot.fraise.farm/, or https://spot-prices.nandling.internal:8787 on the tailnet.