Ingests OpenTelemetry-style spans in bulk and via an OTLP traces endpoint, retrieves and closes traces, and scopes all activity to PromptLayer workspaces for end-to-end observability of multi-step LLM and agent workflows.
openapi: 3.0.1
info:
title: PromptLayer API
description: >-
REST API for PromptLayer, a prompt engineering, prompt management, and LLM
observability platform. The API logs and tracks LLM requests, manages a
versioned prompt registry with release labels, ingests OpenTelemetry-style
spans and traces, and runs evaluations against datasets. All requests are
authenticated with an `X-API-KEY` header. Note: some legacy tracking
endpoints are served under the `/rest` path prefix while newer endpoints are
served at the API root.
termsOfService: https://www.promptlayer.com/terms-of-service
contact:
name: PromptLayer Support
email: hello@promptlayer.com
version: '1.0'
servers:
- url: https://api.promptlayer.com
security:
- ApiKeyAuth: []
tags:
- name: Logging & Tracking
description: Log and track LLM requests, scores, and metadata.
- name: Prompt Registry
description: Retrieve and publish versioned prompt templates.
- name: Evaluations & Datasets
description: Create, run, and score evaluation reports against datasets.
- name: Spans & Traces
description: Ingest spans and manage traces for LLM observability.
paths:
/log-request:
post:
operationId: logRequest
tags:
- Logging & Tracking
summary: Log an LLM request
description: >-
Logs a provider-agnostic LLM request to PromptLayer using the Prompt
Blueprint format for input and output, including timing, parameters,
token usage, price, tags, and metadata.
requestBody:
required: true
content:
application/json:
schema:
$ref: '#/components/schemas/LogRequest'
responses:
'201':
description: Request logged
content:
application/json:
schema:
$ref: '#/components/schemas/LogRequestResponse'
'401':
description: Unauthorized
'422':
description: Validation error
/rest/track-prompt:
post:
operationId: trackPrompt
tags:
- Logging & Tracking
summary: Associate a prompt template with a logged request
description: >-
Associates a prompt template (by name, with optional version or release
label) and its input variables with a previously logged PromptLayer
request.
requestBody:
required: true
content:
application/json:
schema:
$ref: '#/components/schemas/TrackPromptRequest'
responses:
'200':
description: Prompt tracked
content:
application/json:
schema:
$ref: '#/components/schemas/SuccessMessage'
'400':
description: Bad request
'401':
description: Unauthorized
'422':
description: Validation error
/rest/track-score:
post:
operationId: trackScore
tags:
- Logging & Tracking
summary: Attach a score to a logged request
description: Attaches a 0-100 integer score, optionally named, to a logged request.
requestBody:
required: true
content:
application/json:
schema:
$ref: '#/components/schemas/TrackScoreRequest'
responses:
'200':
description: Score tracked
content:
application/json:
schema:
$ref: '#/components/schemas/SuccessMessage'
'400':
description: Bad request
'401':
description: Unauthorized
'422':
description: Validation error
/rest/track-metadata:
post:
operationId: trackMetadata
tags:
- Logging & Tracking
summary: Attach metadata to a logged request
description: Attaches a custom key-value metadata dictionary to a logged request.
requestBody:
required: true
content:
application/json:
schema:
$ref: '#/components/schemas/TrackMetadataRequest'
responses:
'200':
description: Metadata tracked
content:
application/json:
schema:
$ref: '#/components/schemas/SuccessMessage'
'401':
description: Unauthorized
'422':
description: Validation error
/prompt-templates/{identifier}:
post:
operationId: getPromptTemplate
tags:
- Prompt Registry
summary: Get a prompt template
description: >-
Retrieves a prompt template by name or id, resolving an optional version
or release label and optionally formatting it with provided input
variables for a given provider and model.
parameters:
- name: identifier
in: path
required: true
description: The prompt name or prompt template id.
schema:
type: string
requestBody:
required: false
content:
application/json:
schema:
$ref: '#/components/schemas/GetPromptTemplateRequest'
responses:
'200':
description: Prompt template
content:
application/json:
schema:
$ref: '#/components/schemas/PromptTemplate'
'401':
description: Unauthorized
'404':
description: Template not found
/rest/prompt-templates:
post:
operationId: publishPromptTemplate
tags:
- Prompt Registry
summary: Publish a prompt template version
description: >-
Creates a new prompt template (or a new version of an existing one),
optionally assigning release labels and external ids.
requestBody:
required: true
content:
application/json:
schema:
$ref: '#/components/schemas/PublishPromptTemplateRequest'
responses:
'200':
description: Prompt template published
content:
application/json:
schema:
$ref: '#/components/schemas/PublishPromptTemplateResponse'
'401':
description: Unauthorized
'409':
description: External id conflict
'422':
description: Validation error
/evaluations:
get:
operationId: listEvaluations
tags:
- Evaluations & Datasets
summary: List evaluation reports
description: Lists evaluation reports in the workspace.
parameters:
- name: workspace_id
in: query
required: false
schema:
type: integer
- name: per_page
in: query
required: false
schema:
type: integer
- name: page
in: query
required: false
schema:
type: integer
responses:
'200':
description: A list of evaluation reports
content:
application/json:
schema:
$ref: '#/components/schemas/EvaluationList'
'401':
description: Unauthorized
post:
operationId: createEvaluation
tags:
- Evaluations & Datasets
summary: Create an evaluation report
description: Creates a new evaluation report (pipeline) over a dataset.
requestBody:
required: true
content:
application/json:
schema:
$ref: '#/components/schemas/CreateEvaluationRequest'
responses:
'201':
description: Evaluation report created
content:
application/json:
schema:
$ref: '#/components/schemas/Evaluation'
'401':
description: Unauthorized
'422':
description: Validation error
/evaluations/{id}:
get:
operationId: getEvaluation
tags:
- Evaluations & Datasets
summary: Get an evaluation report
parameters:
- name: id
in: path
required: true
schema:
type: integer
responses:
'200':
description: An evaluation report
content:
application/json:
schema:
$ref: '#/components/schemas/Evaluation'
'401':
description: Unauthorized
'404':
description: Not found
/evaluations/{id}/run:
post:
operationId: runEvaluation
tags:
- Evaluations & Datasets
summary: Run an evaluation report
description: Executes an evaluation report, scoring its rows against the configured columns.
parameters:
- name: id
in: path
required: true
schema:
type: integer
responses:
'200':
description: Evaluation run started
content:
application/json:
schema:
$ref: '#/components/schemas/SuccessMessage'
'401':
description: Unauthorized
'404':
description: Not found
/evaluations/{id}/score:
get:
operationId: getEvaluationScore
tags:
- Evaluations & Datasets
summary: Get an evaluation report score
parameters:
- name: id
in: path
required: true
schema:
type: integer
responses:
'200':
description: Evaluation score
content:
application/json:
schema:
$ref: '#/components/schemas/EvaluationScore'
'401':
description: Unauthorized
'404':
description: Not found
/datasets:
get:
operationId: listDatasets
tags:
- Evaluations & Datasets
summary: List datasets
description: Lists evaluation datasets in the workspace.
parameters:
- name: workspace_id
in: query
required: false
schema:
type: integer
responses:
'200':
description: A list of datasets
content:
application/json:
schema:
$ref: '#/components/schemas/DatasetList'
'401':
description: Unauthorized
/spans-bulk:
post:
operationId: createSpansBulk
tags:
- Spans & Traces
summary: Ingest spans in bulk
description: >-
Atomically ingests a batch of OpenTelemetry-style spans. Optional
per-span `log_request` payloads create associated request logs. If any
span fails, the entire batch is rolled back.
requestBody:
required: true
content:
application/json:
schema:
$ref: '#/components/schemas/SpansBulkRequest'
responses:
'201':
description: Spans ingested
content:
application/json:
schema:
$ref: '#/components/schemas/SpansBulkResponse'
'401':
description: Unauthorized
'422':
description: Validation error
/otlp/v1/traces:
post:
operationId: ingestOtlpTraces
tags:
- Spans & Traces
summary: Ingest OTLP traces
description: OpenTelemetry Protocol (OTLP) HTTP endpoint for ingesting traces.
requestBody:
required: true
content:
application/json:
schema:
type: object
additionalProperties: true
responses:
'200':
description: Traces accepted
'401':
description: Unauthorized
/traces/{id}:
get:
operationId: getTrace
tags:
- Spans & Traces
summary: Get a trace
parameters:
- name: id
in: path
required: true
schema:
type: string
responses:
'200':
description: A trace
content:
application/json:
schema:
$ref: '#/components/schemas/Trace'
'401':
description: Unauthorized
'404':
description: Not found
/traces/{id}/close:
post:
operationId: closeTrace
tags:
- Spans & Traces
summary: Close a trace
description: Closes an open trace so no further spans can be appended.
parameters:
- name: id
in: path
required: true
schema:
type: string
responses:
'200':
description: Trace closed
content:
application/json:
schema:
$ref: '#/components/schemas/SuccessMessage'
'401':
description: Unauthorized
'404':
description: Not found
components:
securitySchemes:
ApiKeyAuth:
type: apiKey
in: header
name: X-API-KEY
schemas:
PromptBlueprint:
type: object
description: >-
Prompt Blueprint payload, either a chat prompt (messages array) or a
completion prompt (content string). Provider-agnostic representation.
additionalProperties: true
LogRequest:
type: object
required:
- provider
- model
- input
- output
- request_start_time
- request_end_time
properties:
provider:
type: string
description: LLM provider name (e.g., openai, anthropic).
model:
type: string
description: Model identifier.
input:
$ref: '#/components/schemas/PromptBlueprint'
output:
$ref: '#/components/schemas/PromptBlueprint'
request_start_time:
type: string
format: date-time
request_end_time:
type: string
format: date-time
api_type:
type: string
description: API endpoint type (e.g., chat-completions).
parameters:
type: object
additionalProperties: true
description: Model parameters such as temperature and max_tokens.
tags:
type: array
items:
type: string
metadata:
type: object
additionalProperties:
type: string
status:
type: string
enum:
- SUCCESS
- WARNING
- ERROR
default: SUCCESS
error_type:
type: string
error_message:
type: string
maxLength: 1024
input_tokens:
type: integer
output_tokens:
type: integer
price:
type: number
score:
type: integer
minimum: 0
maximum: 100
LogRequestResponse:
type: object
properties:
id:
type: integer
prompt_version:
type: object
nullable: true
additionalProperties: true
status:
type: string
enum:
- SUCCESS
- WARNING
- ERROR
error_type:
type: string
nullable: true
error_message:
type: string
nullable: true
TrackPromptRequest:
type: object
required:
- prompt_name
- request_id
properties:
prompt_name:
type: string
request_id:
oneOf:
- type: integer
- type: string
prompt_input_variables:
type: object
additionalProperties: true
version:
oneOf:
- type: integer
- type: string
nullable: true
label:
type: string
TrackScoreRequest:
type: object
required:
- request_id
- score
properties:
request_id:
type: integer
score:
type: integer
minimum: 0
maximum: 100
name:
type: string
default: default
TrackMetadataRequest:
type: object
required:
- request_id
- metadata
properties:
request_id:
oneOf:
- type: integer
- type: string
metadata:
type: object
additionalProperties: true
SuccessMessage:
type: object
properties:
success:
type: boolean
message:
type: string
GetPromptTemplateRequest:
type: object
properties:
version:
type: integer
minimum: 1
label:
type: string
description: Release label such as "prod" or "staging".
provider:
type: string
enum:
- openai
- anthropic
input_variables:
type: object
additionalProperties:
type: string
model:
type: string
model_parameter_overrides:
type: object
additionalProperties: true
PromptTemplate:
type: object
properties:
id:
type: integer
prompt_name:
type: string
prompt_template:
$ref: '#/components/schemas/PromptBlueprint'
metadata:
type: object
additionalProperties: true
commit_message:
type: string
llm_kwargs:
type: object
additionalProperties: true
version:
type: integer
PublishPromptTemplateRequest:
type: object
required:
- prompt_template
- prompt_version
properties:
prompt_template:
type: object
required:
- prompt_name
properties:
prompt_name:
type: string
minLength: 1
maxLength: 512
tags:
type: array
items:
type: string
folder_id:
type: integer
workspace_id:
type: integer
prompt_version:
type: object
properties:
prompt_template:
$ref: '#/components/schemas/PromptBlueprint'
commit_message:
type: string
maxLength: 72
metadata:
type: object
additionalProperties: true
release_labels:
type: array
items:
type: string
external_ids:
type: array
items:
type: object
properties:
source:
type: string
external_id:
type: string
PublishPromptTemplateResponse:
type: object
properties:
id:
type: integer
prompt_name:
type: string
prompt_version_id:
type: integer
version_number:
type: integer
tags:
type: array
items:
type: string
release_labels:
type: array
items:
type: string
prompt_template:
$ref: '#/components/schemas/PromptBlueprint'
metadata:
type: object
additionalProperties: true
commit_message:
type: string
Evaluation:
type: object
properties:
id:
type: integer
name:
type: string
status:
type: string
dataset_id:
type: integer
workspace_id:
type: integer
created_at:
type: string
format: date-time
EvaluationList:
type: object
properties:
items:
type: array
items:
$ref: '#/components/schemas/Evaluation'
total:
type: integer
CreateEvaluationRequest:
type: object
required:
- name
properties:
name:
type: string
dataset_id:
type: integer
workspace_id:
type: integer
EvaluationScore:
type: object
properties:
id:
type: integer
score:
type: number
passed:
type: integer
failed:
type: integer
Dataset:
type: object
properties:
id:
type: integer
name:
type: string
workspace_id:
type: integer
row_count:
type: integer
DatasetList:
type: object
properties:
items:
type: array
items:
$ref: '#/components/schemas/Dataset'
total:
type: integer
Span:
type: object
properties:
name:
type: string
context:
type: object
properties:
trace_id:
type: string
span_id:
type: string
trace_state:
type: string
kind:
type: string
enum:
- SpanKind.CLIENT
- SpanKind.CONSUMER
- SpanKind.INTERNAL
- SpanKind.PRODUCER
- SpanKind.SERVER
parent_id:
type: string
nullable: true
start_time:
type: integer
description: Start time in nanoseconds.
end_time:
type: integer
description: End time in nanoseconds.
status:
type: object
properties:
status_code:
type: string
enum:
- StatusCode.OK
- StatusCode.ERROR
- StatusCode.UNSET
description:
type: string
nullable: true
attributes:
type: object
additionalProperties: true
resource:
type: object
properties:
attributes:
type: object
additionalProperties: true
schema_url:
type: string
log_request:
$ref: '#/components/schemas/LogRequest'
SpansBulkRequest:
type: object
required:
- spans
properties:
spans:
type: array
items:
$ref: '#/components/schemas/Span'
close_after:
type: boolean
default: false
SpansBulkResponse:
type: object
properties:
success:
type: boolean
spans:
type: array
items:
type: object
properties:
id:
type: integer
name:
type: string
span_id:
type: string
request_logs:
type: array
items:
type: object
properties:
id:
type: integer
span_id:
type: string
rejected_span_ids:
type: array
nullable: true
items:
type: string
rejected_trace_ids:
type: array
nullable: true
items:
type: string
rejection_reason:
type: string
nullable: true
Trace:
type: object
properties:
id:
type: string
name:
type: string
spans:
type: array
items:
$ref: '#/components/schemas/Span'
closed:
type: boolean