Vellum AI

Vellum AI is an LLM development platform that helps product and engineering teams build, evaluate, deploy, and monitor LLM-powered applications. The platform centers on prompt engineering, a visual Workflows builder for agentic and multi-step pipelines, evaluation suites with dataset management, retrieval-augmented generation, and production observability with logs, traces, and metrics. Target customers are AI product teams at startups and enterprises that need version control, collaboration, and vendor-neutral access across OpenAI, Anthropic, Google, Mistral, and open models. Vellum exposes a REST API plus Python and TypeScript SDKs, runs in cloud and self-hosted deployments, and offers tiered pricing for Pro/Business/Enterprise. Note: as of 2026 the vellum.ai marketing surface has been refocused on a personal AI assistant product; the developer platform documented here remains the LLM application stack.

Vellum AI publishes 23 API contracts indexed on the APIs.io network, including Subpackage Deployments API, Subpackage Document Indexes API, Subpackage Documents API, and 20 more. Tagged areas include LLM Platform, Prompt Engineering, Workflows, Evaluation, and LLMOps.

Vellum AI’s developer surface includes authentication, documentation, engineering blog, pricing, signup flow, and 14 more developer resources.

🌐 Visit website 📡 Profile data on GitHub

34.9/100 thin ▼ -5.8 Agent 32/100 agent ready Front door AI 5/6 prominent saas Full breakdown ↓
scored 2026-10-17 · rubric v0.24.0

AccessFreeSelf serve⚡ Free to try

2 published contracts 1 MCP Servers

LLM PlatformPrompt Engineering Workflows Evaluation LLMOps RAG Observability Datasets Deployment Multi-Provider Agent Builder Self-Hosted

What this lets a business do 3

Business capabilities this provider's published APIs can perform, derived from its own contracts. Browse all capabilities →

Software Product Engineering Management

BC-4200

subpackage_testSuiteRunssubpackage_testSuites

POST /v1/test-suites/{id}/test-cases POST /v1/test-suite-runs GET /v1/test-suite-runs/{id} GET /v1/test-suite-runs/{id}/executions

Information & Data Management

BC-610

Execute Prompt

POST /v1/execute-prompt

Software Release & Deployment Management

BC-4210

subpackage_workflowDeployments

GET /v1/workflow-deployments GET /v1/workflow-deployments/{id}/releases GET /v1/workflow-deployments/{id} PATCH /v1/workflow-deployments/{id}/release-tags/{name}

Kin Score

Kin Score How this is scored →
scored 2026-10-17 · rubric v0.24.0

Composite quality — 34.9/100 · thin

Contract Quality 8.9 / 19

Developer Ergonomics 4.7 / 15

Access Clarity 3.4 / 15

Operational Transparency 0.8 / 10

Contract Governance 0.0 / 9

Discoverability 5.6 / 8

Regulatory Posture 1.8 / 15

Create-or-Update Ergonomics 5.0 / 10

Agent readiness — 32/100 · agent ready

Machine-Readable Contract 18 / 18

Agentic Access Contract 10 / 10

Documented Reversibility 0 / 6

MCP Server 12 / 12

Machine-Readable Auth 10 / 10

Idempotency 0 / 9

Stable Error Semantics 8 / 8

Request/Response Examples 0 / 7

Rate-Limit Signaling 7 / 7

Typed Event Surface 0 / 6

Agent Skills 0 / 5

Well-Known Catalog 0 / 4

Consent & Bot Identity 0 / 3

A2A Agent Card 0 / 8

Dry-Run / Simulate Mode 0 / 4

Delegated User Identity 0 / 6

Protected Resource Metadata 0 / 5

Registration Without a Human 0 / 6

Agentic Commerce Well-Known Document 0 / 5

Regulatory Posture applies to this provider. Its tags matched the Horizontal (data, software, accessibility, platform) regime, so Regulatory Posture carries 15 points of the composite. If this regime is wrong for your business, say so on your provider repo — the applicability map is public and we will correct it.

Create-or-Update Ergonomics applies to this provider. This API accepts writes, so it carries 10 points of the composite. It is scored from the published contracts themselves: whether a caller can create-or-update in one call, whether the write accepts a key the caller already holds, and whether the response says which branch ran. Without that, every write needs a search-and-branch in front of it, and the first time that check is skipped a duplicate record is created. Scored against the observed mean rather than raw — a provider at the catalog average is unchanged by this facet, not penalised by it.

The six quality facets above are damped to 75 points between them, because the conditional facet above carries the other 25. That is why each facet's contribution is shown against a damped maximum: raising a quality facet moves the composite by 75% of its nominal weight, not 100%. The full arithmetic is at apis.io/rating/.

Improve this rating by publishing the missing artifacts — every area above can be raised, and the full rubric is at apis.io/rating/. Every facet and dimension name above is a link: it opens that measurement's own page — what it means, the exact checks that feed it, how the whole catalog distributes on it, and the providers at the top of it. This rating is computed from github.com/api-evangelist/vellum: open an issue to ask a question, or submit a pull request to add artifacts. Submit an artifact on GitHub — free → Manage your own listing — the Influence plan, $499/mo →

APIs 23

Individual APIs this provider publishes, each with its own machine-readable definition.

Vellum LLM Platform API

The Vellum REST API exposes prompts, workflows, evaluations, datasets, document indexes, deployments, and execution endpoints so developers can run versioned LLM pipelines from ...

Vellum AI Subpackage Deployments API

The subpackage_deployments API from Vellum AI — 7 operation(s) for subpackage_deployments.

Vellum AI Subpackage Document Indexes API

The subpackage_documentIndexes API from Vellum AI — 3 operation(s) for subpackage_documentindexes.

Vellum AI Subpackage Documents API

The subpackage_documents API from Vellum AI — 3 operation(s) for subpackage_documents.

Vellum AI Subpackage Events API

The subpackage_events API from Vellum AI — 1 operation(s) for subpackage_events.

Vellum AI Subpackage Folder Entities API

The subpackage_folderEntities API from Vellum AI — 2 operation(s) for subpackage_folderentities.

Vellum AI Subpackage Sandboxes API

The subpackage_sandboxes API from Vellum AI — 3 operation(s) for subpackage_sandboxes.

Vellum AI Subpackage Test Suite Runs API

The subpackage_testSuiteRuns API from Vellum AI — 3 operation(s) for subpackage_testsuiteruns.

Vellum AI Subpackage Test Suites API

The subpackage_testSuites API from Vellum AI — 3 operation(s) for subpackage_testsuites.

Vellum AI Subpackage Uploaded Files API

The subpackage_uploadedFiles API from Vellum AI — 1 operation(s) for subpackage_uploadedfiles.

Vellum AI Subpackage Workflow Deployments API

The subpackage_workflowDeployments API from Vellum AI — 10 operation(s) for subpackage_workflowdeployments.

Vellum AI Subpackage Workflow Executions API

The subpackage_workflowExecutions API from Vellum AI — 1 operation(s) for subpackage_workflowexecutions.

Vellum AI Subpackage Workflows API

The subpackage_workflows API from Vellum AI — 1 operation(s) for subpackage_workflows.

Vellum AI Subpackage Workflow Sandboxes API

The subpackage_workflowSandboxes API from Vellum AI — 1 operation(s) for subpackage_workflowsandboxes.

Vellum AI Subpackage Workspace Secrets API

The subpackage_workspaceSecrets API from Vellum AI — 1 operation(s) for subpackage_workspacesecrets.

Vellum AI Execute Prompt API

The Execute Prompt API from Vellum AI — 1 operation(s) for execute prompt.

Vellum AI Execute Prompt Stream API

The Execute Prompt Stream API from Vellum AI — 1 operation(s) for execute prompt stream.

Vellum AI Execute Workflow API

The Execute Workflow API from Vellum AI — 1 operation(s) for execute workflow.

Vellum AI Execute Workflow Async API

The Execute Workflow Async API from Vellum AI — 1 operation(s) for execute workflow async.

Vellum AI Execute Workflow Stream API

The Execute Workflow Stream API from Vellum AI — 1 operation(s) for execute workflow stream.

Vellum AI Search API

The Search API from Vellum AI — 1 operation(s) for search.

Vellum AI Submit Completion Actuals API

The Submit Completion Actuals API from Vellum AI — 1 operation(s) for submit completion actuals.

Vellum AI Submit Workflow Execution Actuals API

The Submit Workflow Execution Actuals API from Vellum AI — 1 operation(s) for submit workflow execution actuals.

Scroll for all 23

Open Collections 17

Open, tool-agnostic API collections (OpenAPI-derived and Bruno).

API Collection

OPEN COLLECTION

Client SDK API

OPEN COLLECTION

Client SDK subpackage_deployments API

OPEN COLLECTION

Client SDK subpackage_documentIndexes API

OPEN COLLECTION

Client SDK subpackage_documents API

OPEN COLLECTION

Client SDK subpackage_events API

OPEN COLLECTION

Client SDK subpackage_folderEntities API

OPEN COLLECTION

Client SDK subpackage_sandboxes API

OPEN COLLECTION

Client SDK subpackage_testSuiteRuns API

OPEN COLLECTION

Client SDK subpackage_testSuites API

OPEN COLLECTION

Client SDK subpackage_uploadedFiles API

OPEN COLLECTION

Client SDK subpackage_workflowDeployments API

OPEN COLLECTION

Client SDK subpackage_workflowExecutions API

OPEN COLLECTION

Client SDK subpackage_workflows API

OPEN COLLECTION

Client SDK subpackage_workflowSandboxes API

OPEN COLLECTION

Client SDK subpackage_workspaceSecrets API

OPEN COLLECTION

Client SDK

OPEN COLLECTION

Scroll for all 17

MCP Servers 1

Model Context Protocol servers that expose these APIs to AI agents.

Vellum AI MCP Server

Remote MCP server at docs.vellum.ai over HTTP.

MCP SERVER

Pricing Plans 1

Published pricing tiers and plan structures.

Vellum Plans Pricing

1 plans

PLANS

Rate Limits 1

Documented rate limits and quota policies.

Vellum Rate Limits

2 limits

RATE LIMITS

FinOps 1

Cost, billing, and metering signals for API financial operations.

Vellum Finops

FINOPS

Security Posture 2

Authentication, domain security, vulnerability disclosure, and trust-center signals.

Vellum Authentication

apiKey · 1 scheme

SECURITY

Vellum Domain Security

TLSv1.3 · HSTS · DMARC

SECURITY

Agentic Access 1

Recommended x-agentic-access execution contracts for AI agents.

Vellum Agentic Access

59 operations · 30 acting

AGENTIC

Resources

Get Started 2

Portal, sign-up, and the first successful call

Signup

Signup

Login

Documentation 1

Reference material describing how the API behaves

Documentation

Documentation

Agent Surfaces 2

MCP servers, agent skills, and machine-readable catalogs

AgenticAccess

AgenticAccess

LlmsText

LlmsText

Build 1

SDKs, sample code, and the tooling you integrate with

GitHubOrganization

GitHubOrganization

Access & Security 2

Authentication, authorization, and security posture

DomainSecurity

DomainSecurity

Authentication

Authentication

Operate 1

Status, limits, changes, and where to get help

RateLimits

RateLimits

Commercial 5

Pricing, plans, and the legal terms of use

Plans

FinOps

Pricing

TermsOfService

PrivacyPolicy

Company 4

The organization behind the API

Website

Website

Blog

Blog

Twitter

Twitter

LinkedIn

Other 1

Properties that don't map to a standard resource type

CapabilityMap

CapabilityMap

Source (apis.yml)

aid: vellum
name: Vellum AI
description: 'Vellum AI is an LLM development platform that helps product and engineering teams build, evaluate, deploy, and
  monitor LLM-powered applications. The platform centers on prompt engineering, a visual Workflows builder for agentic and
  multi-step pipelines, evaluation suites with dataset management, retrieval-augmented generation, and production observability
  with logs, traces, and metrics. Target customers are AI product teams at startups and enterprises that need version control,
  collaboration, and vendor-neutral access across OpenAI, Anthropic, Google, Mistral, and open models. Vellum exposes a REST
  API plus Python and TypeScript SDKs, runs in cloud and self-hosted deployments, and offers tiered pricing for Pro/Business/Enterprise.
  Note: as of 2026 the vellum.ai marketing surface has been refocused on a personal AI assistant product; the developer platform
  documented here remains the LLM application stack.'
type: Index
deliveryModel:
  model: saas
  open_source: false
  commercial: true
  callable_host: true
  label: Hosted service · you call their endpoint
  confidence: high
  source:
  - openapi
  - pricing
  generated: '2026-08-28'
  method: derived
accessModel:
  pricing: free
  onboarding: self-serve
  trial: false
  try_now: true
  public: false
  label: Free · Self-serve signup
  confidence: medium
  source:
  - plans
  - authentication
  - security
  generated: '2026-09-03'
  method: derived
position: Producing
access: 3rd-Party
image: https://kinlane-images.s3.amazonaws.com/shared/apis-json/icons/vellum.png
x-docs-platform: fern
x-docs-platform-confidence: medium
x-docs-platform-checked: 2026-10-17
x-docs-hosting: vercel
tags:
- LLM Platform
- Prompt Engineering
- Workflows
- Evaluation
- LLMOps
- RAG
- Observability
- Datasets
- Deployment
- Multi-Provider
- Agent Builder
- Self-Hosted
tags_raw:
- LLM Platform
- Prompt Engineering
- Workflows
- Evaluations
- LLM Ops
- RAG
- Observability
- Datasets
- Deployments
- Multi-Provider
- Agent Builder
- Self-Hosted
url: https://raw.githubusercontent.com/api-evangelist/vellum/refs/heads/main/apis.yml
created: '2026-05-23'
modified: '2026-05-23'
specificationVersion: '0.23'
apis:
- aid: vellum:llm-platform
  name: Vellum LLM Platform API
  description: The Vellum REST API exposes prompts, workflows, evaluations, datasets, document indexes, deployments, and execution
    endpoints so developers can run versioned LLM pipelines from their own backends and capture logs and metrics for production
    monitoring.
  humanURL: https://docs.vellum.ai
  baseURL: https://api.vellum.ai
  tags:
  - Prompts
  - Workflows
  - Evaluation
  - Datasets
  - Documents
  - Deployment
  - Execution
  - Monitoring
  tags_raw:
  - Prompts
  - Workflows
  - Evaluations
  - Datasets
  - Documents
  - Deployments
  - Executions
  - Monitoring
  properties:
  - type: Documentation
    url: https://docs.vellum.ai
  - type: APIReference
    url: https://docs.vellum.ai/api-reference
  - type: GettingStarted
    url: https://docs.vellum.ai/welcome/getting-started
  - type: Signup
    url: https://app.vellum.ai/signup
  - type: SDKs
    url: https://github.com/vellum-ai/vellum-client-python
  - type: SDKs
    url: https://github.com/vellum-ai/vellum-client-typescript
  - type: GitHubOrganization
    url: https://github.com/vellum-ai
  - type: Pricing
    url: https://www.vellum.ai/pricing
  - type: Blog
    url: https://www.vellum.ai/blog
  features:
  - name: Prompt Engineering Workbench
    description: Versioned prompts, side-by-side model comparisons, and structured prompt variables.
  - name: Workflows Builder
    description: Visual builder for multi-step LLM pipelines including branching, tools, and RAG nodes.
  - name: Evaluation Suites
    description: Run dataset-driven evals with built-in and custom metrics for prompts and workflows.
  - name: Dataset Management
    description: Store labeled test cases and production examples to drive evaluations and fine-tuning.
  - name: Document Indexes / RAG
    description: Managed document ingestion, embeddings, and retrieval for grounded generation.
  - name: Deployments and Versioning
    description: Promote prompts and workflows through environments with rollback and traffic splits.
  - name: Production Monitoring
    description: Logs, traces, latency, cost, and quality metrics for every execution.
  - name: Multi-Provider Routing
    description: Vendor-neutral access to OpenAI, Anthropic, Google, Mistral, and open models.
  - name: SDKs for Python and TypeScript
    description: First-class SDKs for invoking prompts, workflows, and datasets from application code.
  - name: Self-Hosted Option
    description: Deploy Vellum into the customer's own cloud for compliance-sensitive workloads.
  useCases:
  - name: Build Production LLM Apps
    description: Iterate on prompts and workflows, then deploy versioned endpoints into apps.
  - name: Evaluate LLM Quality
    description: Use datasets and evals to measure regressions across models and prompt variants.
  - name: Build Agents
    description: Compose tools, retrieval, and conditional logic via the visual workflow builder.
  - name: RAG Pipelines
    description: Ingest documents, index them, and query through Vellum's managed retrieval layer.
  - name: Observe and Debug
    description: Trace production runs to debug failures and improve quality over time.
  integrations:
  - name: OpenAI
  - name: Anthropic
  - name: Google
  - name: Mistral
  - name: Cohere
  - name: AWS Bedrock
  - name: Azure OpenAI
  - name: Pinecone
  - name: Snowflake
  - name: LangChain
  - name: LlamaIndex
  authentication:
  - type: API Key
    description: Workspace API keys passed via the `X_API_KEY` header authenticate REST and SDK calls.
- aid: vellum:vellum-subpackage-deployments-api
  name: Vellum AI Subpackage Deployments API
  description: The subpackage_deployments API from Vellum AI — 7 operation(s) for subpackage_deployments.
  humanURL: https://docs.vellum.ai
  baseURL: https://api.vellum.ai
  tags: []
  tags_raw:
  - subpackage_deployments
  properties:
  - type: OpenAPI
    url: openapi/vellum-subpackage-deployments-api-openapi.yml
- aid: vellum:vellum-subpackage-documentindexes-api
  name: Vellum AI Subpackage Document Indexes API
  description: The subpackage_documentIndexes API from Vellum AI — 3 operation(s) for subpackage_documentindexes.
  humanURL: https://docs.vellum.ai
  baseURL: https://api.vellum.ai
  tags:
  - subpackage_documentIndexes
  properties:
  - type: OpenAPI
    url: openapi/vellum-subpackage-documentindexes-api-openapi.yml
- aid: vellum:vellum-subpackage-documents-api
  name: Vellum AI Subpackage Documents API
  description: The subpackage_documents API from Vellum AI — 3 operation(s) for subpackage_documents.
  humanURL: https://docs.vellum.ai
  baseURL: https://api.vellum.ai
  tags: []
  tags_raw:
  - subpackage_documents
  properties:
  - type: OpenAPI
    url: openapi/vellum-subpackage-documents-api-openapi.yml
- aid: vellum:vellum-subpackage-events-api
  name: Vellum AI Subpackage Events API
  description: The subpackage_events API from Vellum AI — 1 operation(s) for subpackage_events.
  humanURL: https://docs.vellum.ai
  baseURL: https://api.vellum.ai
  tags: []
  tags_raw:
  - subpackage_events
  properties:
  - type: OpenAPI
    url: openapi/vellum-subpackage-events-api-openapi.yml
- aid: vellum:vellum-subpackage-folderentities-api
  name: Vellum AI Subpackage Folder Entities API
  description: The subpackage_folderEntities API from Vellum AI — 2 operation(s) for subpackage_folderentities.
  humanURL: https://docs.vellum.ai
  baseURL: https://api.vellum.ai
  tags:
  - subpackage_folderEntities
  properties:
  - type: OpenAPI
    url: openapi/vellum-subpackage-folderentities-api-openapi.yml
- aid: vellum:vellum-subpackage-sandboxes-api
  name: Vellum AI Subpackage Sandboxes API
  description: The subpackage_sandboxes API from Vellum AI — 3 operation(s) for subpackage_sandboxes.
  humanURL: https://docs.vellum.ai
  baseURL: https://api.vellum.ai
  tags: []
  tags_raw:
  - subpackage_sandboxes
  properties:
  - type: OpenAPI
    url: openapi/vellum-subpackage-sandboxes-api-openapi.yml
- aid: vellum:vellum-subpackage-testsuiteruns-api
  name: Vellum AI Subpackage Test Suite Runs API
  description: The subpackage_testSuiteRuns API from Vellum AI — 3 operation(s) for subpackage_testsuiteruns.
  humanURL: https://docs.vellum.ai
  baseURL: https://api.vellum.ai
  tags:
  - subpackage_testSuiteRuns
  properties:
  - type: OpenAPI
    url: openapi/vellum-subpackage-testsuiteruns-api-openapi.yml
- aid: vellum:vellum-subpackage-testsuites-api
  name: Vellum AI Subpackage Test Suites API
  description: The subpackage_testSuites API from Vellum AI — 3 operation(s) for subpackage_testsuites.
  humanURL: https://docs.vellum.ai
  baseURL: https://api.vellum.ai
  tags:
  - subpackage_testSuites
  properties:
  - type: OpenAPI
    url: openapi/vellum-subpackage-testsuites-api-openapi.yml
- aid: vellum:vellum-subpackage-uploadedfiles-api
  name: Vellum AI Subpackage Uploaded Files API
  description: The subpackage_uploadedFiles API from Vellum AI — 1 operation(s) for subpackage_uploadedfiles.
  humanURL: https://docs.vellum.ai
  baseURL: https://api.vellum.ai
  tags:
  - subpackage_uploadedFiles
  properties:
  - type: OpenAPI
    url: openapi/vellum-subpackage-uploadedfiles-api-openapi.yml
- aid: vellum:vellum-subpackage-workflowdeployments-api
  name: Vellum AI Subpackage Workflow Deployments API
  description: The subpackage_workflowDeployments API from Vellum AI — 10 operation(s) for subpackage_workflowdeployments.
  humanURL: https://docs.vellum.ai
  baseURL: https://api.vellum.ai
  tags:
  - subpackage_workflowDeployments
  properties:
  - type: OpenAPI
    url: openapi/vellum-subpackage-workflowdeployments-api-openapi.yml
- aid: vellum:vellum-subpackage-workflowexecutions-api
  name: Vellum AI Subpackage Workflow Executions API
  description: The subpackage_workflowExecutions API from Vellum AI — 1 operation(s) for subpackage_workflowexecutions.
  humanURL: https://docs.vellum.ai
  baseURL: https://api.vellum.ai
  tags:
  - subpackage_workflowExecutions
  properties:
  - type: OpenAPI
    url: openapi/vellum-subpackage-workflowexecutions-api-openapi.yml
- aid: vellum:vellum-subpackage-workflows-api
  name: Vellum AI Subpackage Workflows API
  description: The subpackage_workflows API from Vellum AI — 1 operation(s) for subpackage_workflows.
  humanURL: https://docs.vellum.ai
  baseURL: https://api.vellum.ai
  tags: []
  tags_raw:
  - subpackage_workflows
  properties:
  - type: OpenAPI
    url: openapi/vellum-subpackage-workflows-api-openapi.yml
- aid: vellum:vellum-subpackage-workflowsandboxes-api
  name: Vellum AI Subpackage Workflow Sandboxes API
  description: The subpackage_workflowSandboxes API from Vellum AI — 1 operation(s) for subpackage_workflowsandboxes.
  humanURL: https://docs.vellum.ai
  baseURL: https://api.vellum.ai
  tags:
  - subpackage_workflowSandboxes
  properties:
  - type: OpenAPI
    url: openapi/vellum-subpackage-workflowsandboxes-api-openapi.yml
- aid: vellum:vellum-subpackage-workspacesecrets-api
  name: Vellum AI Subpackage Workspace Secrets API
  description: The subpackage_workspaceSecrets API from Vellum AI — 1 operation(s) for subpackage_workspacesecrets.
  humanURL: https://docs.vellum.ai
  baseURL: https://api.vellum.ai
  tags:
  - subpackage_workspaceSecrets
  properties:
  - type: OpenAPI
    url: openapi/vellum-subpackage-workspacesecrets-api-openapi.yml
- aid: vellum:vellum-execute-prompt-api
  name: Vellum AI Execute Prompt API
  description: The Execute Prompt API from Vellum AI — 1 operation(s) for execute prompt.
  humanURL: https://docs.vellum.ai
  baseURL: https://api.vellum.ai
  tags:
  - Execute Prompt
  properties:
  - type: OpenAPI
    url: openapi/vellum-execute-prompt-api-openapi.yml
- aid: vellum:vellum-execute-prompt-stream-api
  name: Vellum AI Execute Prompt Stream API
  description: The Execute Prompt Stream API from Vellum AI — 1 operation(s) for execute prompt stream.
  humanURL: https://docs.vellum.ai
  baseURL: https://api.vellum.ai
  tags:
  - Execute Prompt Stream
  properties:
  - type: OpenAPI
    url: openapi/vellum-execute-prompt-stream-api-openapi.yml
- aid: vellum:vellum-execute-workflow-api
  name: Vellum AI Execute Workflow API
  description: The Execute Workflow API from Vellum AI — 1 operation(s) for execute workflow.
  humanURL: https://docs.vellum.ai
  baseURL: https://api.vellum.ai
  tags:
  - Execute Workflow
  properties:
  - type: OpenAPI
    url: openapi/vellum-execute-workflow-api-openapi.yml
- aid: vellum:vellum-execute-workflow-async-api
  name: Vellum AI Execute Workflow Async API
  description: The Execute Workflow Async API from Vellum AI — 1 operation(s) for execute workflow async.
  humanURL: https://docs.vellum.ai
  baseURL: https://api.vellum.ai
  tags:
  - Execute Workflow Async
  properties:
  - type: OpenAPI
    url: openapi/vellum-execute-workflow-async-api-openapi.yml
- aid: vellum:vellum-execute-workflow-stream-api
  name: Vellum AI Execute Workflow Stream API
  description: The Execute Workflow Stream API from Vellum AI — 1 operation(s) for execute workflow stream.
  humanURL: https://docs.vellum.ai
  baseURL: https://api.vellum.ai
  tags:
  - Execute Workflow Stream
  properties:
  - type: OpenAPI
    url: openapi/vellum-execute-workflow-stream-api-openapi.yml
- aid: vellum:vellum-search-api
  name: Vellum AI Search API
  description: The Search API from Vellum AI — 1 operation(s) for search.
  humanURL: https://docs.vellum.ai
  baseURL: https://api.vellum.ai
  tags:
  - Search
  properties:
  - type: OpenAPI
    url: openapi/vellum-search-api-openapi.yml
- aid: vellum:vellum-submit-completion-actuals-api
  name: Vellum AI Submit Completion Actuals API
  description: The Submit Completion Actuals API from Vellum AI — 1 operation(s) for submit completion actuals.
  humanURL: https://docs.vellum.ai
  baseURL: https://api.vellum.ai
  tags:
  - Submit Completion Actuals
  properties:
  - type: OpenAPI
    url: openapi/vellum-submit-completion-actuals-api-openapi.yml
- aid: vellum:vellum-submit-workflow-execution-actuals-api
  name: Vellum AI Submit Workflow Execution Actuals API
  description: The Submit Workflow Execution Actuals API from Vellum AI — 1 operation(s) for submit workflow execution actuals.
  humanURL: https://docs.vellum.ai
  baseURL: https://api.vellum.ai
  tags:
  - Submit Workflow Execution Actuals
  properties:
  - type: OpenAPI
    url: openapi/vellum-submit-workflow-execution-actuals-api-openapi.yml
common:
- type: Plans
  url: plans/vellum-plans-pricing.yml
- type: RateLimits
  url: rate-limits/vellum-rate-limits.yml
- type: FinOps
  url: finops/vellum-finops.yml
- type: CapabilityMap
  url: capabilities/vellum-capability-edges.yml
  name: Vellum AI Business Capability Map
- type: AgenticAccess
  url: agentic-access/vellum-agentic-access.yml
- type: DomainSecurity
  url: security/vellum-domain-security.yml
- type: Authentication
  url: authentication/vellum-authentication.yml
- type: Website
  url: https://www.vellum.ai
- type: Documentation
  url: https://docs.vellum.ai
- type: Blog
  url: https://www.vellum.ai/blog
- type: GitHubOrganization
  url: https://github.com/vellum-ai
- type: Pricing
  url: https://www.vellum.ai/pricing
- type: Signup
  url: https://app.vellum.ai/signup
- type: Login
  url: https://app.vellum.ai/login
- type: TermsOfService
  url: https://www.vellum.ai/terms-of-service
- type: PrivacyPolicy
  url: https://www.vellum.ai/privacy-policy
- type: Twitter
  url: https://x.com/vellum_ai
- type: LinkedIn
  url: https://www.linkedin.com/company/vellum-ai
- type: LlmsText
  url: https://docs.vellum.ai/llms.txt
maintainers:
- FN: Kin Lane
  email: kin@apievangelist.com

Work with this as data

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Tools for providers

9 MCP tools reach this

find_providersBrowse and filter every provider in the catalog.
get_provider_artifactsEvery artifact this provider publishes, grouped by type.
get_provider_operationsEvery operation across all of their OpenAPIs — one call instead of parsing every spec.
get_provider_toolsEvery MCP tool they ship, with the operation each wraps.
get_provider_evidenceHow each part of their score was established. Free — the basis for a claim should not sit behind it.
get_provider_ratingPRO — composite, band, trend and facet scores.
apis_io_searchSTART HERE — APIs, providers and tags for one query, each with its total.
resolveTurn a domain, URL or GitHub org into the provider it belongs to.
find_cohortsEvery scored population of providers in the catalog.

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Every operation they expose

curl "https://apis.io/api/v1/providers/vellum/operations?limit=25"

How their score was established

curl "https://apis.io/api/v1/providers/vellum/evidence"

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