QuestDB

QuestDB is a high-performance open-source time-series database. It exposes three programmatic surfaces — an HTTP REST API for SQL queries and CSV import/export, the InfluxDB Line Protocol (ILP) over TCP and HTTP for high-throughput ingestion, and the PostgreSQL wire protocol for compatibility with existing tooling. QuestDB is offered as open-source, Enterprise (self-hosted) and Bring-Your-Own-Cloud (BYOC).

QuestDB publishes 6 APIs on the APIs.io network, including Chk API, Exec API, Exp API, and 3 more. Tagged areas include Database, Time-Series, SQL, Open Source, and Performance.

QuestDB’s developer surface includes authentication, documentation, pricing, GitHub presence, engineering blog, and 9 more developer resources.

🌐 Visit website 📡 Source on GitHub

41.6/100 thin ▬ flat Agent 31/100 agent aware Full breakdown ↓
scored 2026-08-05 · rubric v0.9.1

AccessFreemiumSelf serve⚡ Free to try

10 APIs

DatabaseTime-SeriesSQLOpen SourcePerformanceILPPostgreSQL

Kin Score

Kin Score How this is scored →
scored 2026-08-05 · rubric v0.9.1

Composite quality — 41.6/100 · thin

Contract Quality 15.1 / 25

Developer Ergonomics 4.3 / 20

Commercial Clarity 10.0 / 20

Operational Transparency 4.8 / 13

Governance 0.0 / 12

Discoverability 7.4 / 10

Agent readiness — 31/100 · agent aware

Machine-Readable Contract 18 / 18

Agentic Access Contract 10 / 10

MCP Server 0 / 12

Machine-Readable Auth 10 / 10

Idempotency 0 / 9

Stable Error Semantics 0 / 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

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/questdb: 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 10

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

Rate Limits 1

Documented rate limits and quota policies.

Questdb Rate Limits

4 limits

RATE LIMITS

FinOps 1

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

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

GitHub

GitHub

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 3

Pricing, plans, and the legal terms of use

Pricing

Pricing

Plans

Plans

FinOps

FinOps

Company 3

The organization behind the API

LinkedIn

Website

Website

Blog

Blog

Other 1

Properties that don't map to a standard resource type

BYOC

BYOC

Source (apis.yml)

aid: questdb
url: https://raw.githubusercontent.com/api-evangelist/questdb/refs/heads/main/apis.yml
name: QuestDB
kind: company
description: QuestDB is a high-performance open-source time-series database. It exposes three programmatic surfaces — an HTTP
  REST API for SQL queries and CSV import/export, the InfluxDB Line Protocol (ILP) over TCP and HTTP for high-throughput ingestion,
  and the PostgreSQL wire protocol for compatibility with existing tooling. QuestDB is offered as open-source, Enterprise
  (self-hosted) and Bring-Your-Own-Cloud (BYOC).
accessModel:
  pricing: freemium
  onboarding: self-serve
  trial: false
  try_now: true
  public: false
  label: Freemium · Self-serve signup
  confidence: high
  source:
  - plans
  - authentication
  generated: '2026-07-22'
  method: derived
image: https://kinlane-images.s3.amazonaws.com/shared/apis-json/icons/questdb.png
tags:
- Database
- Time-Series
- SQL
- Open Source
- Performance
- ILP
- PostgreSQL
created: '2026-05-08'
modified: '2026-05-08'
specificationVersion: '0.19'
apis:
- aid: questdb:rest-http
  name: QuestDB HTTP REST API
  description: HTTP REST endpoints for SQL execution (/exec), CSV import (/imp), CSV export (/exp), health/metrics (/chk,
    /metrics) and runtime settings (/settings). Default port 9000.
  image: https://kinlane-images.s3.amazonaws.com/shared/apis-json/apis-json-logo.jpg
  humanURL: https://questdb.com/docs/reference/sql/overview/
  baseURL: http://<host>:9000
  tags:
  - REST
  - SQL
  - CSV
  - Health
  - Metrics
  properties:
  - type: Documentation
    url: https://questdb.com/docs/
  - type: APIReference
    url: https://questdb.com/docs/reference/api/rest/
- aid: questdb:ilp-tcp
  name: QuestDB ILP TCP Ingestion
  description: InfluxDB Line Protocol over TCP for high-throughput, low-latency time-series ingestion. Default port 9009.
    Supports authentication and TLS in Enterprise.
  image: https://kinlane-images.s3.amazonaws.com/shared/apis-json/apis-json-logo.jpg
  humanURL: https://questdb.com/docs/reference/api/ilp/overview/
  baseURL: tcp://<host>:9009
  tags:
  - ILP
  - TCP
  - Ingestion
  properties:
  - type: Documentation
    url: https://questdb.com/docs/reference/api/ilp/overview/
- aid: questdb:ilp-http
  name: QuestDB ILP HTTP Ingestion
  description: Influx Line Protocol over HTTP /write endpoint for ingestion clients that prefer HTTP (TLS, auth and ack semantics
    easier than the TCP variant). Served on the same port (9000) as the REST API.
  image: https://kinlane-images.s3.amazonaws.com/shared/apis-json/apis-json-logo.jpg
  humanURL: https://questdb.com/docs/reference/api/ilp/overview/
  baseURL: http://<host>:9000
  tags:
  - ILP
  - HTTP
  - Ingestion
- aid: questdb:postgres-wire
  name: QuestDB PostgreSQL Wire Interface
  description: PostgreSQL wire-protocol compatibility for queries via psql, JDBC and any Postgres-compatible client. Default
    port 8812. Supports a subset of Postgres features sufficient for SQL analytics on QuestDB.
  image: https://kinlane-images.s3.amazonaws.com/shared/apis-json/apis-json-logo.jpg
  humanURL: https://questdb.com/docs/develop/connect/
  baseURL: postgres://<host>:8812
  tags:
  - PostgreSQL
  - Wire Protocol
  - JDBC
- aid: questdb:questdb-chk-api
  name: QuestDB Chk API
  description: The Chk API from QuestDB — 1 operation(s) for chk.
  humanURL: https://questdb.com/docs/reference/sql/overview/
  baseURL: http://<host>:9000
  tags:
  - Chk
  properties:
  - type: OpenAPI
    url: openapi/questdb-chk-api-openapi.yml
- aid: questdb:questdb-exec-api
  name: QuestDB Exec API
  description: The Exec API from QuestDB — 1 operation(s) for exec.
  humanURL: https://questdb.com/docs/reference/sql/overview/
  baseURL: http://<host>:9000
  tags:
  - Exec
  properties:
  - type: OpenAPI
    url: openapi/questdb-exec-api-openapi.yml
- aid: questdb:questdb-exp-api
  name: QuestDB Exp API
  description: The Exp API from QuestDB — 1 operation(s) for exp.
  humanURL: https://questdb.com/docs/reference/sql/overview/
  baseURL: http://<host>:9000
  tags:
  - Exp
  properties:
  - type: OpenAPI
    url: openapi/questdb-exp-api-openapi.yml
- aid: questdb:questdb-imp-api
  name: QuestDB Imp API
  description: The Imp API from QuestDB — 1 operation(s) for imp.
  humanURL: https://questdb.com/docs/reference/sql/overview/
  baseURL: http://<host>:9000
  tags:
  - Imp
  properties:
  - type: OpenAPI
    url: openapi/questdb-imp-api-openapi.yml
- aid: questdb:questdb-settings-api
  name: QuestDB Settings API
  description: The Settings API from QuestDB — 1 operation(s) for settings.
  humanURL: https://questdb.com/docs/reference/sql/overview/
  baseURL: http://<host>:9000
  tags:
  - Settings
  properties:
  - type: OpenAPI
    url: openapi/questdb-settings-api-openapi.yml
- aid: questdb:questdb-write-api
  name: QuestDB Write API
  description: The Write API from QuestDB — 1 operation(s) for write.
  humanURL: https://questdb.com/docs/reference/sql/overview/
  baseURL: http://<host>:9000
  tags:
  - Write
  properties:
  - type: OpenAPI
    url: openapi/questdb-write-api-openapi.yml
common:
- type: AgenticAccess
  url: agentic-access/questdb-agentic-access.yml
- type: DomainSecurity
  url: security/questdb-domain-security.yml
- type: Authentication
  url: authentication/questdb-authentication.yml
- type: LinkedIn
  url: https://www.linkedin.com/company/questdb
- type: Website
  url: https://questdb.com/
- type: Documentation
  url: https://questdb.com/docs/
- type: Pricing
  url: https://questdb.com/enterprise/
- type: GitHub
  url: https://github.com/questdb/questdb
- type: BYOC
  url: https://questdb.com/byoc/
- type: Plans
  url: plans/questdb-plans-pricing.yml
- url: https://questdb.com/rss.xml
  type: Blog
- type: RateLimits
  url: rate-limits/questdb-rate-limits.yml
- type: FinOps
  url: finops/questdb-finops.yml
- type: LlmsText
  url: https://questdb.com/llms.txt
maintainers:
- FN: Kin Lane
  email: kin@apievangelist.com

QuestDB

Kin Score

APIs 10

QuestDB HTTP REST API

QuestDB ILP TCP Ingestion

QuestDB ILP HTTP Ingestion

QuestDB PostgreSQL Wire Interface

QuestDB Chk API

QuestDB Exec API

QuestDB Exp API

QuestDB Imp API

QuestDB Settings API

QuestDB Write API

Open Collections 1

QuestDB HTTP REST API

Pricing Plans 1

Questdb Plans Pricing

Rate Limits 1

Questdb Rate Limits

FinOps 1

Questdb Finops

Security Posture 2

Questdb Authentication

Questdb Domain Security

Agentic Access 1

Questdb Agentic Access

Resources