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Calling Custom APIs

Custom APIs are exposed as HTTP endpoints that return JSON. You can call them from any language or tool that supports HTTP requests.

API endpoints​

Rill Cloud​

https://api.rilldata.com/v1/organizations/<org-name>/projects/<project-name>/runtime/api/<api-name>

Local development​

http://localhost:9009/v1/instances/default/api/<api-name>

Where <api-name> is the name of your API file without the .yaml extension (e.g., my-api.yaml → my-api).

Making requests​

Custom APIs accept both GET and POST requests.

GET with query parameters​

curl "https://api.rilldata.com/v1/organizations/<org>/projects/<project>/runtime/api/my-api?domain=google.com&limit=10" \
  -H "Authorization: Bearer <token>"

POST with JSON body​

curl -X POST "https://api.rilldata.com/v1/organizations/<org>/projects/<project>/runtime/api/my-api" \
  -H "Authorization: Bearer <token>" \
  -H "Content-Type: application/json" \
  -d '{"domain": "google.com", "limit": 10}'

Both methods produce the same result. If you provide both query parameters and a JSON body, query parameters take precedence.

Response format​

APIs return a JSON array of objects:

[
  {"publisher": "Facebook", "domain": "google.com", "total": 15234},
  {"publisher": "Google", "domain": "google.com", "total": 12876}
]

Testing locally​

Local development does not require authentication:

# GET request
curl "http://localhost:9009/v1/instances/default/api/my-api?domain=google.com"

# POST request
curl -X POST http://localhost:9009/v1/instances/default/api/my-api \
  -H "Content-Type: application/json" \
  -d '{"domain": "google.com"}'
note

User attributes ({{ .user.* }}) are not available during local testing since no authentication token is provided. To test with user attributes, deploy to Rill Cloud and use a service token with custom attributes.

Authentication​

Rill Cloud APIs require a bearer token in the Authorization header.

For development and testing​

Create a user token (inherits your personal permissions):

rill token issue --display-name "API Testing"
# Returns: rill_usr_...

curl "https://api.rilldata.com/v1/organizations/<org>/projects/<project>/runtime/api/my-api" \
  -H "Authorization: Bearer rill_usr_..."

For production systems​

Create a service token with optional custom attributes:

rill service create my-api-service \
  --project my-project \
  --project-role viewer \
  --attributes '{"customer_id": "acme-corp"}'
# Returns: rill_svc_...

Custom attributes on the token are available in your API templates as {{ .user.customer_id }}. See Security & Access Control for details on how to use custom attributes to build multi-tenant APIs.

note

If you need short-lived tokens with custom attributes for end users, use the ephemeral token feature instead of creating a service token per user.

Token Documentation

For full guidance on token types, roles, and management:

OpenAPI schema​

Rill automatically generates an OpenAPI spec for your project. Download it to generate typed clients:

# From Rill Cloud
curl "https://api.rilldata.com/v1/organizations/<org>/projects/<project>/runtime/api/openapi" \
  -H "Authorization: Bearer <token>" \
  -o openapi.json

# Locally
curl http://localhost:9009/v1/instances/default/api/openapi -o openapi.json

See OpenAPI Documentation for how to add request and response schemas to your API definitions.