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{
"openapi": "3.1.0",
"info": {
"title": "Sim API — Execution & Usage",
"description": "Run workflows, poll and cancel executions, resume Human-in-the-Loop pauses, and check usage limits.",
"version": "1.0.0",
"contact": {
"name": "Sim Support",
"email": "help@sim.ai",
"url": "https://www.sim.ai"
},
"license": {
"name": "Apache 2.0",
"url": "https://www.apache.org/licenses/LICENSE-2.0.html"
}
},
"servers": [
{
"url": "https://www.sim.ai",
"description": "Production"
}
],
"tags": [
{
"name": "Execution",
"description": "Run workflows, poll execution status, and cancel runs"
},
{
"name": "Human in the Loop",
"description": "Manage paused workflow executions and resume them with input"
},
{
"name": "Usage",
"description": "Check rate limits and billing usage"
},
{
"name": "Billing",
"description": "Inspect billing status and credit-denominated ledger events"
}
],
"security": [
{
"apiKey": []
}
],
"paths": {
"/api/workflows/{id}/execute": {
"post": {
"operationId": "executeWorkflow",
"summary": "Execute Workflow",
"description": "Execute a deployed workflow. Supports synchronous, asynchronous, and streaming modes. For async execution, the response includes a statusUrl you can poll for results.",
"tags": ["Execution"],
"x-codeSamples": [
{
"id": "curl",
"label": "cURL",
"lang": "bash",
"source": "curl -X POST \\\n \"https://www.sim.ai/api/workflows/{id}/execute\" \\\n -H \"X-API-Key: YOUR_API_KEY\" \\\n -H \"Content-Type: application/json\" \\\n -d '{\n \"input\": {\n \"key\": \"value\"\n }\n }'"
}
],
"parameters": [
{
"name": "id",
"in": "path",
"required": true,
"description": "The unique identifier of the deployed workflow to execute.",
"schema": {
"type": "string",
"example": "3b1f7c92-8d4e-4a6b-9c0d-5e2f8a714b36"
}
}
],
"requestBody": {
"description": "Execution configuration including input values and execution mode options.",
"content": {
"application/json": {
"schema": {
"type": "object",
"properties": {
"input": {
"type": "object",
"description": "Key-value pairs matching the workflow's defined input fields. Use the Get Workflow endpoint to discover available input fields.",
"additionalProperties": true
},
"triggerType": {
"type": "string",
"description": "How this execution was triggered. Defaults to api when called via the REST API. Recorded in execution logs for filtering."
},
"stream": {
"type": "boolean",
"description": "When true, returns results as Server-Sent Events (SSE) for real-time block-by-block output streaming."
},
"selectedOutputs": {
"type": "array",
"items": {
"type": "string"
},
"description": "List of specific block IDs whose outputs to include in the response. When omitted, all block outputs are returned."
}
}
},
"example": {
"input": {
"query": "What is the weather in Tokyo?"
}
}
}
}
},
"responses": {
"200": {
"description": "Synchronous execution completed successfully.",
"content": {
"application/json": {
"schema": {
"$ref": "#/components/schemas/ExecutionResult"
},
"example": {
"success": true,
"executionId": "c7a92e15-3f4b-4d8c-a1e6-9b0d5f2c8e74",
"output": {
"content": "The weather in Tokyo is sunny, 22°C."
},
"error": null,
"metadata": {
"startTime": "2026-01-15T10:30:00Z",
"endTime": "2026-01-15T10:30:01Z",
"duration": 1250
}
}
}
}
},
"202": {
"description": "Asynchronous execution has been queued. Poll the statusUrl for results.",
"content": {
"application/json": {
"schema": {
"$ref": "#/components/schemas/AsyncExecutionResult"
}
}
}
},
"401": {
"$ref": "#/components/responses/Unauthorized"
},
"404": {
"$ref": "#/components/responses/NotFound"
},
"429": {
"$ref": "#/components/responses/RateLimited"
}
}
}
},
"/api/workflows/{id}/executions/{executionId}": {
"get": {
"operationId": "getWorkflowExecution",
"summary": "Get Execution Status",
"description": "Get the current status of a workflow execution. Returns `queued` immediately after async dispatch, then the run's durable lifecycle state (`running`, `paused`, `completed`, `failed`, etc.), timing, error, and optionally per-block outputs. This legacy-compatible resource remains available for existing integrations.",
"tags": ["Execution"],
"x-codeSamples": [
{
"id": "curl",
"label": "cURL",
"lang": "bash",
"source": "curl \\\n \"https://www.sim.ai/api/workflows/{id}/executions/{executionId}\" \\\n -H \"X-API-Key: YOUR_API_KEY\""
},
{
"id": "curl-with-outputs",
"label": "cURL (with block outputs)",
"lang": "bash",
"source": "curl \\\n \"https://www.sim.ai/api/workflows/{id}/executions/{executionId}?selectedOutputs=blockId,blockId.field&includeOutput=true\" \\\n -H \"X-API-Key: YOUR_API_KEY\""
}
],
"parameters": [
{
"name": "id",
"in": "path",
"required": true,
"description": "The unique identifier of the workflow.",
"schema": {
"type": "string",
"example": "3b1f7c92-8d4e-4a6b-9c0d-5e2f8a714b36"
}
},
{
"name": "executionId",
"in": "path",
"required": true,
"description": "The unique identifier of the execution.",
"schema": {
"type": "string",
"example": "e4f8d2b6-9a1c-4e3d-8b7f-5c0a2d9e6f13"
}
},
{
"name": "includeOutput",
"in": "query",
"required": false,
"description": "When `true` and the execution has `status: completed`, include the workflow's final output in the response.",
"schema": {
"type": "string",
"enum": ["true", "false"]
}
},
{
"name": "selectedOutputs",
"in": "query",
"required": false,
"description": "Comma-separated block-output selectors. A bare `blockId` returns that block's full output; a dot-path like `blockId.field` or `blockId.nested.path` returns just that value. Results are returned in the `blockOutputs` map keyed by the selector string.",
"schema": {
"type": "string",
"example": "a6f0c8d2-3e57-4b19-8d4a-1c9e2f6b0a35,a6f0c8d2-3e57-4b19-8d4a-1c9e2f6b0a35.waitDuration"
}
}
],
"responses": {
"200": {
"description": "Execution status returned.",
"content": {
"application/json": {
"schema": {
"$ref": "#/components/schemas/WorkflowExecutionStatus"
},
"examples": {
"completed": {
"summary": "Completed run",
"value": {
"executionId": "e4f8d2b6-9a1c-4e3d-8b7f-5c0a2d9e6f13",
"workflowId": "3b1f7c92-8d4e-4a6b-9c0d-5e2f8a714b36",
"status": "completed",
"trigger": "api",
"level": "info",
"startedAt": "2026-05-15T19:43:12.189Z",
"endedAt": "2026-05-15T19:45:45.224Z",
"totalDurationMs": 153035,
"paused": null,
"cost": {
"total": 0.005
},
"error": null,
"finalOutput": null,
"blockOutputs": null
}
},
"paused": {
"summary": "Currently paused run",
"value": {
"executionId": "d5e1a3c7-8f60-4b29-9c4d-2a6e0f8b3d17",
"workflowId": "3b1f7c92-8d4e-4a6b-9c0d-5e2f8a714b36",
"status": "paused",
"trigger": "manual",
"level": "info",
"startedAt": "2026-05-15T22:25:57.178Z",
"endedAt": "2026-05-15T22:25:57.215Z",
"totalDurationMs": 1,
"paused": {
"pausedAt": "2026-05-15T22:25:57.216Z",
"resumeAt": "2026-05-16T18:25:57.200Z",
"pauseKind": "time",
"blockedOnBlockId": "a6f0c8d2-3e57-4b19-8d4a-1c9e2f6b0a35",
"pausedExecutionId": "9d3b7f10-2c8e-4a56-b0f4-6e1a8c5d2b97",
"pausePointCount": 1,
"resumedCount": 0
},
"cost": {
"total": 0.005
},
"error": null,
"finalOutput": null,
"blockOutputs": null
}
},
"failed": {
"summary": "Failed run",
"value": {
"executionId": "b8c2e60f-1a47-4d35-9e8b-3f0d5a7c2e19",
"workflowId": "3b1f7c92-8d4e-4a6b-9c0d-5e2f8a714b36",
"status": "failed",
"trigger": "api",
"level": "error",
"startedAt": "2026-05-15T22:24:50.991Z",
"endedAt": "2026-05-15T22:24:50.999Z",
"totalDurationMs": 2,
"paused": null,
"cost": {
"total": 0.005
},
"error": "Wait 1: Wait time exceeds maximum of 5 minutes; enable async mode to wait up to 30 days",
"finalOutput": null,
"blockOutputs": null
}
}
}
}
}
},
"401": {
"$ref": "#/components/responses/Unauthorized"
},
"404": {
"$ref": "#/components/responses/NotFound"
}
}
}
},
"/api/workflows/{id}/executions/{executionId}/cancel": {
"post": {
"operationId": "cancelExecution",
"summary": "Cancel Execution",
"description": "Cancel a running workflow execution. Only effective for executions that are still in progress.",
"tags": ["Execution"],
"x-codeSamples": [
{
"id": "curl",
"label": "cURL",
"lang": "bash",
"source": "curl -X POST \\\n \"https://www.sim.ai/api/workflows/{id}/executions/{executionId}/cancel\" \\\n -H \"X-API-Key: YOUR_API_KEY\""
}
],
"parameters": [
{
"name": "id",
"in": "path",
"required": true,
"description": "The unique identifier of the workflow.",
"schema": {
"type": "string",
"example": "3b1f7c92-8d4e-4a6b-9c0d-5e2f8a714b36"
}
},
{
"name": "executionId",
"in": "path",
"required": true,
"description": "The unique identifier of the execution to cancel.",
"schema": {
"type": "string",
"example": "e4f8d2b6-9a1c-4e3d-8b7f-5c0a2d9e6f13"
}
}
],
"responses": {
"200": {
"description": "Execution was successfully cancelled.",
"content": {
"application/json": {
"schema": {
"type": "object",
"properties": {
"success": {
"type": "boolean",
"description": "Whether the cancellation was successful."
},
"executionId": {
"type": "string",
"description": "The ID of the cancelled execution."
}
}
},
"example": {
"success": true,
"executionId": "c7a92e15-3f4b-4d8c-a1e6-9b0d5f2c8e74"
}
}
}
},
"401": {
"$ref": "#/components/responses/Unauthorized"
},
"404": {
"$ref": "#/components/responses/NotFound"
}
}
}
},
"/api/jobs/{jobId}": {
"get": {
"operationId": "getJobStatus",
"summary": "Get Job Status",
"description": "Poll the status of an asynchronous workflow execution. Use the jobId returned from the Execute Workflow endpoint when the execution is queued asynchronously.",
"tags": ["Execution"],
"x-codeSamples": [
{
"id": "curl",
"label": "cURL",
"lang": "bash",
"source": "curl -X GET \\\n \"https://www.sim.ai/api/jobs/{jobId}\" \\\n -H \"X-API-Key: YOUR_API_KEY\""
}
],
"parameters": [
{
"name": "jobId",
"in": "path",
"required": true,
"description": "The job identifier returned in the async execution response.",
"schema": {
"type": "string",
"example": "job_4a3b2c1d0e"
}
}
],
"responses": {
"200": {
"description": "Current status of the job. When completed, includes the execution output.",
"content": {
"application/json": {
"schema": {
"$ref": "#/components/schemas/JobStatus"
},
"example": {
"success": true,
"taskId": "job_abc123",
"status": "completed",
"output": {
"content": "Done"
},
"metadata": {
"startTime": "2026-01-15T10:30:00Z"
}
}
}
}
},
"401": {
"$ref": "#/components/responses/Unauthorized"
},
"403": {
"$ref": "#/components/responses/Forbidden"
},
"404": {
"$ref": "#/components/responses/NotFound"
}
}
}
},
"/api/workflows/{id}/paused": {
"get": {
"operationId": "listPausedExecutions",
"summary": "List Paused Executions",
"description": "List all paused executions for a workflow. Workflows pause at Human in the Loop blocks and wait for input before continuing. Use this endpoint to discover which executions need attention.",
"tags": ["Human in the Loop"],
"x-codeSamples": [
{
"id": "curl",
"label": "cURL",
"lang": "bash",
"source": "curl -X GET \\\n \"https://www.sim.ai/api/workflows/{id}/paused?status=paused\" \\\n -H \"X-API-Key: YOUR_API_KEY\""
}
],
"parameters": [
{
"name": "id",
"in": "path",
"required": true,
"description": "The unique identifier of the workflow.",
"schema": {
"type": "string",
"example": "3b1f7c92-8d4e-4a6b-9c0d-5e2f8a714b36"
}
},
{
"name": "status",
"in": "query",
"required": false,
"description": "Filter paused executions by status.",
"schema": {
"type": "string",
"example": "paused"
}
}
],
"responses": {
"200": {
"description": "List of paused executions.",
"content": {
"application/json": {
"schema": {
"type": "object",
"properties": {
"pausedExecutions": {
"type": "array",
"items": {
"$ref": "#/components/schemas/PausedExecutionSummary"
}
}
}
},
"example": {
"pausedExecutions": [
{
"id": "pe_abc123",
"workflowId": "3b1f7c92-8d4e-4a6b-9c0d-5e2f8a714b36",
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"updatedAt": "2026-01-15T10:30:00Z",
"expiresAt": null,
"metadata": null,
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{
"contextId": "ctx_xyz789",
"blockId": "block_hitl_1",
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"resumeStatus": "paused",
"snapshotReady": true,
"resumeLinks": {
"apiUrl": "https://www.sim.ai/api/resume/3b1f7c92-8d4e-4a6b-9c0d-5e2f8a714b36/e4f8d2b6-9a1c-4e3d-8b7f-5c0a2d9e6f13/ctx_xyz789",
"uiUrl": "https://www.sim.ai/resume/3b1f7c92-8d4e-4a6b-9c0d-5e2f8a714b36/e4f8d2b6-9a1c-4e3d-8b7f-5c0a2d9e6f13",
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"workflowId": "3b1f7c92-8d4e-4a6b-9c0d-5e2f8a714b36"
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"response": {
"displayData": {
"title": "Approval Required",
"message": "Please review this request"
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"formFields": []
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}
]
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}
}
},
"400": {
"$ref": "#/components/responses/BadRequest"
},
"401": {
"$ref": "#/components/responses/Unauthorized"
},
"403": {
"$ref": "#/components/responses/Forbidden"
},
"404": {
"$ref": "#/components/responses/NotFound"
}
}
}
},
"/api/workflows/{id}/paused/{executionId}": {
"get": {
"operationId": "getPausedExecution",
"summary": "Get Paused Execution",
"description": "Get detailed information about a specific paused execution, including its pause points, execution snapshot, and resume queue. Use this to inspect the state before resuming.",
"tags": ["Human in the Loop"],
"x-codeSamples": [
{
"id": "curl",
"label": "cURL",
"lang": "bash",
"source": "curl -X GET \\\n \"https://www.sim.ai/api/workflows/{id}/paused/{executionId}\" \\\n -H \"X-API-Key: YOUR_API_KEY\""
}
],
"parameters": [
{
"name": "id",
"in": "path",
"required": true,
"description": "The unique identifier of the workflow.",
"schema": {
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"example": "3b1f7c92-8d4e-4a6b-9c0d-5e2f8a714b36"
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},
{
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"type": "string",
"example": "e4f8d2b6-9a1c-4e3d-8b7f-5c0a2d9e6f13"
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"responses": {
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"$ref": "#/components/schemas/PausedExecutionDetail"
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"401": {
"$ref": "#/components/responses/Unauthorized"
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"403": {
"$ref": "#/components/responses/Forbidden"
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"404": {
"$ref": "#/components/responses/NotFound"
}
}
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},
"/api/resume/{workflowId}/{executionId}": {
"get": {
"operationId": "getPausedExecutionByResumePath",
"summary": "Get Paused Execution (Resume Path)",
"description": "Get detailed information about a specific paused execution using the resume URL path. Returns the same data as the workflow paused execution detail endpoint.",
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"source": "curl -X GET \\\n \"https://www.sim.ai/api/resume/{workflowId}/{executionId}\" \\\n -H \"X-API-Key: YOUR_API_KEY\""
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"name": "workflowId",
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"required": true,
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"example": "3b1f7c92-8d4e-4a6b-9c0d-5e2f8a714b36"
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},
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"name": "executionId",
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"description": "The execution ID of the paused execution.",
"schema": {
"type": "string",
"example": "e4f8d2b6-9a1c-4e3d-8b7f-5c0a2d9e6f13"
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"responses": {
"200": {
"description": "Paused execution details.",
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"schema": {
"$ref": "#/components/schemas/PausedExecutionDetail"
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"401": {
"$ref": "#/components/responses/Unauthorized"
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"403": {
"$ref": "#/components/responses/Forbidden"
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"404": {
"$ref": "#/components/responses/NotFound"
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"500": {
"description": "Internal server error.",
"content": {
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"properties": {
"error": {
"type": "string",
"description": "Human-readable error message."
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}
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}
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}
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},
"/api/resume/{workflowId}/{executionId}/{contextId}": {
"get": {
"operationId": "getPauseContext",
"summary": "Get Pause Context",
"description": "Get detailed information about a specific pause context within a paused execution. Returns the pause point details, resume queue state, and any active resume entry.",
"tags": ["Human in the Loop"],
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"parameters": [
{
"name": "workflowId",
"in": "path",
"required": true,
"description": "The unique identifier of the workflow.",
"schema": {
"type": "string",
"example": "3b1f7c92-8d4e-4a6b-9c0d-5e2f8a714b36"
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{
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"required": true,
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"example": "e4f8d2b6-9a1c-4e3d-8b7f-5c0a2d9e6f13"
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"required": true,
"description": "The pause context ID to retrieve details for.",
"schema": {
"type": "string",
"example": "ctx_xyz789"
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"200": {
"description": "Pause context details.",
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"schema": {
"$ref": "#/components/schemas/PauseContextDetail"
}
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"$ref": "#/components/responses/Unauthorized"
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"403": {
"$ref": "#/components/responses/Forbidden"
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"$ref": "#/components/responses/NotFound"
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"tags": ["Human in the Loop"],
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"name": "workflowId",
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"required": true,
"description": "The unique identifier of the workflow.",
"schema": {
"type": "string",
"example": "3b1f7c92-8d4e-4a6b-9c0d-5e2f8a714b36"
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"type": "string",
"example": "ctx_xyz789"
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"description": "Key-value pairs to pass as input to the resumed execution. If omitted, the entire request body is used as input.",
"additionalProperties": true
}
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},
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{
"$ref": "#/components/schemas/ResumeResult"
},
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"type": "object",
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"status": {
"type": "string",
"enum": ["queued"],
"description": "Indicates the resume is queued."
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"executionId": {
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"description": "The execution ID assigned to this resume."
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"description": "Position in the resume queue."
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"message": {
"type": "string",
"description": "Human-readable status message."
}
}
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{
"type": "object",
"description": "Resume execution started (non-API-key callers). The execution runs asynchronously.",
"properties": {
"status": {
"type": "string",
"enum": ["started"],
"description": "Indicates the resume execution has started."
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"executionId": {
"type": "string",
"description": "The execution ID for the resumed workflow."
},
"message": {
"type": "string",
"description": "Human-readable status message."
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"value": {
"success": true,
"status": "completed",
"executionId": "f0b3d8c2-7e5a-4b9d-8c1f-6a4e2d0b9c58",
"output": {
"result": "Approved and processed"
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"endTime": "2026-01-15T10:35:01Z"
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"queued": {
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"value": {
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"queuePosition": 2,
"message": "Resume queued. It will run after current resumes finish."
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},
"started": {
"summary": "Execution started (fire and forget)",
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},
"202": {
"description": "Resume execution has been queued for asynchronous processing. Poll the statusUrl for results.",
"content": {
"application/json": {
"schema": {
"$ref": "#/components/schemas/AsyncExecutionResult"
},
"example": {
"success": true,
"async": true,
"jobId": "job_4a3b2c1d0e",
"executionId": "f0b3d8c2-7e5a-4b9d-8c1f-6a4e2d0b9c58",
"message": "Resume execution queued",
"statusUrl": "https://www.sim.ai/api/jobs/job_4a3b2c1d0e"
}
}
}
},
"400": {
"$ref": "#/components/responses/BadRequest"
},
"401": {
"$ref": "#/components/responses/Unauthorized"
},
"403": {
"$ref": "#/components/responses/Forbidden"
},
"404": {
"$ref": "#/components/responses/NotFound"
},
"500": {
"description": "Internal server error.",
"content": {
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"schema": {
"type": "object",
"properties": {
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},
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}
},
"/api/users/me/usage-limits": {
"get": {
"operationId": "getUsageLimits",
"summary": "Get Usage Limits",
"description": "Retrieve your current usage spending and storage consumption for the billing period.",
"tags": ["Usage"],
"x-codeSamples": [
{
"id": "curl",
"label": "cURL",
"lang": "bash",
"source": "curl -X GET \\\n \"https://www.sim.ai/api/users/me/usage-limits\" \\\n -H \"X-API-Key: YOUR_API_KEY\""
}
],
"responses": {
"200": {
"description": "Current usage and storage information.",
"content": {
"application/json": {
"schema": {
"$ref": "#/components/schemas/UsageLimits"
},
"example": {
"success": true,
"usage": {
You can’t perform that action at this time.