Ascend.io website screenshot

Ascend.io

Ascend.io is a data engineering platform for building declarative, DataAware data pipelines that unify ingestion, transformation, and orchestration across warehouses like BigQuery, Snowflake, Databricks, and MotherDuck. Pipelines are authored in SQL, Python, and YAML and operated through Otto, Ascend's agentic AI assistant. Its developer surface is the Ascend Instance web API (/api/v1, service-account Bearer auth) exposed through the ascend-tools CLI, first-party Python/JavaScript/Rust SDKs, and an official 25-tool MCP server. Ascend announced in 2026 that it is winding down operations; the open-source tooling and documentation remain published at capture time. Added to the API Evangelist network as an Accel portfolio company.

Ascend.io publishes 1 API on the APIs.io network. Tagged areas include Company, Big Data, Data Engineering, Data Pipelines, and ETL.

Ascend.io’s developer surface includes documentation, API reference, quickstart, signup flow, support, CLI, authentication, and 14 more developer resources.

🌐 Visit website 📡 Source on GitHub
28.2/100 emerging ▬ flat Agent 34/100 agent aware Full breakdown ↓
scored 2026-07-27 · rubric v0.5
AccessSelf serve
1 APIs 1 MCP Servers
CompanyBig DataData EngineeringData PipelinesETLOrchestrationData AutomationMCPDeveloper Tools

Kin Score

Kin Score Kin Score How this is scored →
scored 2026-07-27 · rubric v0.5
Composite quality — 28.2/100 · emerging
Contract Quality 0.0 / 25
Developer Ergonomics 15.7 / 20
Commercial Clarity 2.6 / 20
Operational Transparency 0.7 / 13
Governance 0.0 / 12
Discoverability 9.3 / 10
Agent readiness — 34/100 · agent aware
Machine-Readable Contract 0 / 18
Agentic Access Contract 0 / 15
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 0 / 7
Typed Event Surface 0 / 6
Agent Skills 5 / 5
Well-Known Catalog 0 / 4
Consent & Bot Identity 0 / 3
Improve this rating by publishing the missing artifacts — every area above can be raised, and the full rubric is at apis.io/rating/. This rating is computed from github.com/api-evangelist/ascendio: open an issue to ask a question, or submit a pull request to add artifacts. Want it done for you? Prioritized profiling — $2,500 →

APIs 1

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

Ascend Instance API

REST API (/api/v1) for managing Ascend workspaces, deployments, environments, projects, profiles, flows, flow runs, and Otto. Service-account Bearer authentication.

MCP Servers 1

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

ascendio-mcp.yml

MCP SERVER

Security Posture 2

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

Ascendio Authentication

http-bearer/service-account · 1 scheme

SECURITY

Ascendio Domain Security

TLSv1.3 · DMARC

SECURITY

Resources

Get Started 3

Portal, sign-up, and the first successful call

DeveloperPortal
DeveloperPortal
 Quickstart
Quickstart
 SignUp
SignUp

Documentation 2

Reference material describing how the API behaves

Documentation
Documentation
 APIReference
APIReference

Agent Surfaces 3

MCP servers, agent skills, and machine-readable catalogs

MCPServer
MCPServer
 AgentSkill
AgentSkill
 LLMsTxt
LLMsTxt

Design & Contract 5

Pagination, idempotency, versioning, errors, and events

Conventions
Conventions
 ErrorCatalog
ErrorCatalog
 Lifecycle
Lifecycle
 DataModel
DataModel
 Conformance
Conformance

Build 4

SDKs, sample code, and the tooling you integrate with

GitHubOrganization
GitHubOrganization
 Packages
Packages
 SDKs
SDKs
 CLI
CLI

Access & Security 2

Authentication, authorization, and security posture

Authentication
Authentication
 DomainSecurity
DomainSecurity

Operate 1

Status, limits, changes, and where to get help

Support
Support

Company 1

The organization behind the API

Website
Website

Source (apis.yml)

apis.yml Raw ↑ 
aid: ascendio
accessModel:
  pricing: unknown
  onboarding: self-serve
  trial: false
  try_now: false
  public: false
  label: Self-serve signup
  confidence: medium
  source:
  - authentication
  generated: '2026-07-22'
  method: derived
image: https://kinlane-images.s3.amazonaws.com/shared/apis-json/icons/ascendio.png
name: Ascend.io
description: Ascend.io is a data engineering platform for building declarative, DataAware data pipelines that unify ingestion,
  transformation, and orchestration across warehouses like BigQuery, Snowflake, Databricks, and MotherDuck. Pipelines are
  authored in SQL, Python, and YAML and operated through Otto, Ascend's agentic AI assistant. Its developer surface is the
  Ascend Instance web API (/api/v1, service-account Bearer auth) exposed through the ascend-tools CLI, first-party Python/JavaScript/Rust
  SDKs, and an official 25-tool MCP server. Ascend announced in 2026 that it is winding down operations; the open-source tooling
  and documentation remain published at capture time. Added to the API Evangelist network as an Accel portfolio company.
url: https://raw.githubusercontent.com/api-evangelist/ascendio/refs/heads/main/apis.yml
x-type: company
x-source: vc-portfolio
x-backed-by:
- accel
x-tier: stub
x-tier-reason: portfolio-lead
specificationVersion: '0.20'
created: '2026-07-17'
modified: '2026-07-18'
tags:
- Company
- Big Data
- Data Engineering
- Data Pipelines
- ETL
- Orchestration
- Data Automation
- MCP
- Developer Tools
apis:
- name: Ascend Instance API
  description: REST API (/api/v1) for managing Ascend workspaces, deployments, environments, projects, profiles, flows, flow
    runs, and Otto. Service-account Bearer authentication.
  humanURL: https://docs.ascend.io/reference/api/ascend-api
  baseURL: https://api.instance.ascend.io/api/v1
  properties:
  - type: Authentication
    url: authentication/ascendio-authentication.yml
  - type: Conventions
    url: conventions/ascendio-conventions.yml
  - type: ErrorCatalog
    url: errors/ascendio-error-codes.yml
  - type: DataModel
    url: data-model/ascendio-data-model.yml
maintainers:
- FN: Kin Lane
  email: kin@apievangelist.com
- FN: APIs.json
  email: info@apis.io
common:
- type: Website
  url: https://www.ascend.io
- type: DeveloperPortal
  url: https://developer.ascend.io
- type: Documentation
  url: https://docs.ascend.io
- type: APIReference
  url: https://docs.ascend.io/reference/api/ascend-api
- type: Quickstart
  url: https://docs.ascend.io/getting-started/quickstart
- type: GitHubOrganization
  url: https://github.com/ascend-io
- type: SignUp
  url: https://app.ascend.io/signup
- type: Support
  url: https://docs.ascend.io/support
- type: Packages
  url: packages/ascendio-packages.yml
- type: SDKs
  url: packages/ascendio-packages.yml
- type: CLI
  url: cli/ascendio-cli.yml
- type: MCPServer
  url: mcp/ascendio-mcp.yml
- type: AgentSkill
  url: skills/_index.yml
- type: Authentication
  url: authentication/ascendio-authentication.yml
- type: Conventions
  url: conventions/ascendio-conventions.yml
- type: ErrorCatalog
  url: errors/ascendio-error-codes.yml
- type: Lifecycle
  url: lifecycle/ascendio-lifecycle.yml
- type: DataModel
  url: data-model/ascendio-data-model.yml
- type: Conformance
  url: conformance/ascendio-conformance.yml
- type: DomainSecurity
  url: security/ascendio-domain-security.yml
- type: LLMsTxt
  url: llms/ascendio-llms.txt
x-enrichment:
  date: '2026-07-19'
  status: backfilled
  pass: local-v1
  note: backfilled from .gitignore signal + verified work evidence