# Service Reference

One page per AWS service: a quick start, what works, and how it differs from
AWS. Point any SDK or CLI at `http://localhost:4566` and pick your service
below.

```bash
export AWS_ENDPOINT_URL=http://localhost:4566
aws sqs create-queue --queue-name orders
```

## Where to start

| If you're… | Start with |
| --- | --- |
| Deploying a CDK or CloudFormation app | [CloudFormation](/docs/services/cloudformation/index.md), then [Using AWS CDK](/docs/cdk/index.md) |
| Building a serverless API | [Lambda](/docs/services/lambda/index.md), [API Gateway](/docs/services/apigateway/index.md), [DynamoDB](/docs/services/dynamodb/index.md) |
| Wiring messaging and events | [SQS](/docs/services/sqs/index.md), [SNS](/docs/services/sns/index.md), [EventBridge](/docs/services/eventbridge/index.md) |
| Running containers | [ECS](/docs/services/ecs/index.md), [ECR](/docs/services/ecr/index.md), [ELBv2](/docs/services/elb/index.md) |
| Storing objects or data | [S3](/docs/services/s3/index.md), [DynamoDB](/docs/services/dynamodb/index.md), [RDS](/docs/services/rds/index.md) |

## Services

**Compute and containers** — [Lambda](/docs/services/lambda/index.md) · [ECS](/docs/services/ecs/index.md) ·
[ECR](/docs/services/ecr/index.md) · [EC2 / VPC](/docs/services/ec2/index.md) · [Auto Scaling](/docs/services/autoscaling/index.md) ·
[EKS](/docs/services/eks/index.md)

**Storage and data** — [S3](/docs/services/s3/index.md) · [DynamoDB](/docs/services/dynamodb/index.md) ·
[DynamoDB Streams](/docs/services/dynamodbstreams/index.md) · [RDS](/docs/services/rds/index.md) ·
[ElastiCache](/docs/services/elasticache/index.md) · [EFS](/docs/services/efs/index.md) · [Kinesis](/docs/services/kinesis/index.md) ·
[Firehose](/docs/services/firehose/index.md) · [MSK](/docs/services/msk/index.md) · [Athena](/docs/services/athena/index.md) ·
[Glue](/docs/services/glue/index.md) · [OpenSearch](/docs/services/opensearch/index.md) · [Backup](/docs/services/backup/index.md) ·
[Transfer Family](/docs/services/transfer/index.md)

**Messaging and events** — [SQS](/docs/services/sqs/index.md) · [SNS](/docs/services/sns/index.md) ·
[EventBridge](/docs/services/eventbridge/index.md) · [Scheduler](/docs/services/scheduler/index.md) ·
[Pipes](/docs/services/pipes/index.md) · [Step Functions](/docs/services/stepfunctions/index.md) · [SES](/docs/services/ses/index.md)

**APIs and delivery** — [API Gateway](/docs/services/apigateway/index.md) ·
[AppSync](/docs/services/appsync/index.md) · [CloudFront](/docs/services/cloudfront/index.md) · [ELBv2](/docs/services/elb/index.md) ·
[Route 53](/docs/services/route53/index.md) · [ACM](/docs/services/acm/index.md)

**Identity and security** — [IAM](/docs/services/iam/index.md) · [STS](/docs/services/sts/index.md) ·
[Cognito](/docs/services/cognito/index.md) · [KMS](/docs/services/kms/index.md) ·
[Secrets Manager](/docs/services/secretsmanager/index.md) · [SSM](/docs/services/ssm/index.md) · [WAF v2](/docs/services/waf/index.md) ·
[Shield](/docs/services/shield/index.md) · [Organizations](/docs/services/organizations/index.md)

**Observability** — [CloudWatch](/docs/services/cloudwatch/index.md) ·
[CloudWatch Logs](/docs/services/cloudwatch-logs/index.md) · [CloudTrail](/docs/services/cloudtrail/index.md)

**Provisioning and config** — [CloudFormation](/docs/services/cloudformation/index.md) ·
[AppConfig](/docs/services/appconfig/index.md) · [AppConfigData](/docs/services/appconfigdata/index.md) ·
[AppRegistry](/docs/services/appregistry/index.md) · [Bedrock](/docs/services/bedrock/index.md)

## Coverage tiers

Each service has an overall tier, and it decides the **Status:** token at the top
of that service's page. The full generated table, with operation counts and
tiers, is on [Reference index § Services](/docs/reference/index.md#services).

| Tier | Meaning | Page status |
| --- | --- | --- |
| Comprehensive | Real SDK clients use it end to end. | ✅ Supported |
| Core CRUD | Resources are created, stored and returned; common workflows work. | ⚠️ Partial |
| Minimal | A targeted subset — enough for one or two workflows. | ⚠️ Partial |
| Stub | Registered so discovery and IaC work; most operations return `501`. | ⚠️ Partial |

Each operation carries its own status token, and the service pages use the same
five words for anything they qualify:

| Status | Meaning |
| --- | --- |
| ✅ Supported | Works for normal SDK and CLI use. |
| ⚠️ Partial | Works with documented caveats or missing edge cases. |
| 🧊 Inert | Accepted and answered correctly, but nothing happens as a result. |
| 🚧 WIP | Present, still moving. |
| ❌ Unsupported | Modelled but not implemented. |

An unsupported operation answers with an AWS-shaped error rather than hanging or
failing to connect, so an SDK raises something you can read:

```
HTTP 501 Not Implemented
x-emulator-unsupported: true

{
  "__type": "NotImplemented",
  "message": "This operation is not yet emulated. Check docs/services/ for the support matrix."
}
```

A running service also reports a **runtime emulation tier** — full, partial,
inert or stub — on `/_overcast/health`, in `overcast services` and in the web
console. That is a different axis, defined in
[Reference index § Runtime emulation tiers](/docs/reference/index.md#runtime-emulation-tiers).

## Related

- [Using AWS SDKs and CLI](/docs/sdk-cli/index.md) — endpoint configuration per language
- [Configuration reference](/docs/configuration/index.md) — environment variables and service names
- [Networking and host-based addressing](/docs/networking/index.md) — path-style vs. host-routed endpoints