AWS data plane cost estimate - Docs by LangChain

These are estimates, not a quote. AWS changes its prices without notice. Your bill depends on region, usage, and any discount agreement with AWS, such as an Enterprise Discount Program or a Savings Plan.

This is a rough monthly cost for a LangSmith data plane in your AWS account.

Scaling capacity for any resource can be lowered when required, as long as the deployment remains within safe operating limits. For cost-conscious or pre-production deployments, Multi-AZ can be turned off. That lowers monthly cost but reduces fault tolerance.

ClickHouse
SmithDB

ClickHouse can also run as a single node instead of a replicated cluster. That lowers monthly cost but reduces fault tolerance.

Area	Rough monthly estimate	Notes
RDS PostgreSQL	$100–$150	`db.t4g.medium`, Multi-AZ, 50 GB starting storage.
ElastiCache Redis	$140–$280	Lower end without read replicas. Higher end if read replicas are enabled.
EKS control plane	~$75	One EKS cluster at standard hourly pricing.
System node group	~$210	3 `m6i.large` on-demand nodes.
Application, ClickHouse, and ZooKeeper worker nodes	$1,000–$1,500	LangSmith pods and ClickHouse pods.
EBS volumes	$200–$350	ClickHouse, ZooKeeper, node volumes, and gp3 performance settings.
Networking	$150–$300	NAT gateways, load balancers, PrivateLink or VPC endpoints, and low-volume data processing.
S3, Secrets Manager, CloudWatch	$50–$200	Low-volume baseline. Grows with trace payloads, logs, and retention.

Estimated monthly total: $1,925–$3,065

By default, SmithDB runs the Small tier from Configure SmithDB for scale: about 10 runs per second and 10 queries per second. LangSmith increases that tier as tracing volume requires it.

After the SmithDB migration, ClickHouse and ZooKeeper are scaled down. If cost is a concern, ClickHouse can be turned off. That lowers monthly cost but reduces reliability, because there is no ClickHouse fallback.

Area	Rough monthly estimate	Notes
RDS PostgreSQL	$100–$150	`db.t4g.medium`, Multi-AZ, 50 GB starting storage.
ElastiCache Redis	$140–$280	Lower end without read replicas. Higher end if read replicas are enabled.
EKS control plane	~$75	One EKS cluster at standard hourly pricing.
System node group	~$210	3 `m6i.large` on-demand nodes.
Application, ClickHouse, and ZooKeeper worker nodes	$650	Scaled down ClickHouse costs.
EBS volumes	$200–$350	ClickHouse, ZooKeeper, node volumes, and gp3 performance settings. Lower once those volumes shrink.
Networking	$150–$300	NAT gateways, load balancers, PrivateLink or VPC endpoints, and low-volume data processing.
S3, Secrets Manager, CloudWatch	$50–$200	Low-volume baseline. Grows with trace payloads, logs, and retention.
SmithDB compute	$1,550	2 x `m7gd.4xlarge` across two availability zones, plus a 100 GiB gp3 boot volume on each node.
SmithDB metastore	$210	Aurora PostgreSQL 18 Serverless v2, writer and reader, 1 ACU minimum, 50 GB.
SmithDB bucket	$5–$120	S3 storage costs, would largely be dictated by trace payload size and retention.

Estimated monthly total: $3,340–$4,095

SmithDB object store pricing

Stored size per trace	14-day retention	400-day retention
10 KB	$2 per year	$74 per year
50 KB	$15 per year	$368 per year
200 KB	$52 per year	$1,472 per year

A ClickHouse backfill needs an extra m7gd.4xlarge for the migration job at about $24 per day. That cost stops when the backfill finishes (Job finishes in a few days depending on tracing volume).See Prepare SmithDB supporting infrastructure for details of SmithDB infrastructure.

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​SmithDB object store pricing

SmithDB object store pricing