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 10 API contracts indexed on the APIs.io network, including Chk API, Exec API, Exp API, and 7 more. Tagged areas include Database, Time Series, SQL, Open Source, and Performance.

The QuestDB catalog on APIs.io includes 1 Spectral governance ruleset.

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

🌐 Visit website 📡 Profile data on GitHub

31.9/100 thin ▬ flat Agent 18/100 agent aware Front door AI 4/6 moderate Heartbeat 96/100 alive open core · Apache-2.0 Full breakdown ↓
scored 2026-11-13 · rubric v0.28.0 · Show this score on your site →

AccessFreemiumSelf serve⚡ Free to try

1 published contract

Database Time Series SQL Open Source PerformanceILPPostgreSQL

Kin Score

Kin Score How this is scored →
scored 2026-11-13 · rubric v0.28.0

Composite quality — 31.9/100 · thin

Contract Quality 8.9 / 19

Developer Ergonomics 4.7 / 15

Access Clarity 3.2 / 15

Operational Transparency 1.2 / 10

Contract Governance 1.2 / 9

Discoverability 5.5 / 8

Regulatory Posture 0.9 / 15

Create-or-Update Ergonomics 1.1 / 10

Agent readiness — 18/100 · agent aware

Machine-Readable Contract 18 / 18

Agentic Access Contract 10 / 10

Documented Reversibility 0 / 6

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

Delegated User Identity 0 / 6

Protected Resource Metadata 0 / 5

Registration Without a Human 0 / 6

Agentic Commerce Well-Known Document 0 / 5

Pagination 5 / 5

Distinct Operations 3 / 3

MCP Tool Quality 6 / 6

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/.

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Agent readiness — checks not met, largest first (exact, from this profile):

MCP Server +12 pts — deployment.mode + probe verdict on the mcp/ manifest, not the pointer; an unprobed slug falls back to authorship Ask about this →
Idempotency +9 pts — OpenAPI mutating operations declare an idempotency key — a header, a request-body property, or a named de-duplication token whose own description says so (verified); else common[].type matches /idempoten/i (documented) Ask about this →
Stable Error Semantics +8 pts — OpenAPI $refs a shared error schema across 4xx/5xx responses (verified), else common[].type includes ErrorCatalog / ErrorCodes / DeclineCodes Ask about this →
A2A Agent Card +8 pts — a2a/-a2a.yml manifest, graded on conformance.grade against A2A 1.0.0 Ask about this →
Request/Response Examples +7 pts — share of operations carrying request/response examples; else an Examples / Code Samples link Ask about this →
Registration Without a Human +6 pts — a `registration_endpoint` in the served RFC 8414 / OIDC discovery document Ask about this →

9 more unmet checks in the Agent Readiness table above.

Kin Score — facets with the most composite points still available (weight × headroom):

Access Clarity scores 21.3 — up to +15.7 composite points Ask about this →
Developer Ergonomics scores 31.0 — up to +13.8 composite points Ask about this →
Contract Quality scores 47.6 — up to +13.1 composite points Ask about this →

Each check links to what satisfies it. Publish the artifact, or tell us where it already lives, and the score moves on the next scoring run.

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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 the provider profile at artifacts.apis.io/questdb/apis.yml: open an issue on github.com/api-evangelist/questdb to ask a question or point us at an artifact you publish. Submit an artifact on GitHub — free → Manage your own listing — the Influence plan, $499/mo →

Markets this provider is in provisional

The Kin Score Market layer reads a provider inside its market: its position, and how deep its integrations go. Depth is only comparable within a position. Provisional and unweighted: not part of the Kin Score or agent readiness.

Market	Position	Depth	Registered MCP server	Declares compatibility
Databases (PostgreSQL wire)	distribution	9.6 (thin)	-	1

Registered MCP server and declares compatibility are report only — not weighted. Undeclared means we found nothing we can read, so there is no number: we never infer integrations.

Standards implemented 1

Standards this provider implements or carries. De facto ones are profiled and measured by the API Commons; formal ones come from the standards directory and are linked by the provider's own tags. The evidence column says how each claim was established — not that it was made.

OpenAPI

measured — observed by APIs.io (published)

APIs 10

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

QuestDB HTTP REST API

HTTP REST endpoints for SQL execution (/exec), CSV import (/imp), CSV export (/exp), health/metrics (/chk, /metrics) and runtime settings (/settings). Default port 9000.

QuestDB ILP TCP Ingestion

InfluxDB Line Protocol over TCP for high-throughput, low-latency time-series ingestion. Default port 9009. Supports authentication and TLS in Enterprise.

QuestDB ILP HTTP Ingestion

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) a...

QuestDB PostgreSQL Wire Interface

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 SQ...

QuestDB Chk API

The Chk API from QuestDB — 1 operation(s) for chk.

QuestDB Exec API

The Exec API from QuestDB — 1 operation(s) for exec.

QuestDB Exp API

The Exp API from QuestDB — 1 operation(s) for exp.

QuestDB Imp API

The Imp API from QuestDB — 1 operation(s) for imp.

QuestDB Settings API

The Settings API from QuestDB — 1 operation(s) for settings.

QuestDB Write API

The Write API from QuestDB — 1 operation(s) for write.

Scroll for all 10

Open Collections 7

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

QuestDB HTTP REST Chk API

OPEN COLLECTION

QuestDB HTTP REST Chk Exec API

OPEN COLLECTION

QuestDB HTTP REST Chk Exp API

OPEN COLLECTION

QuestDB HTTP REST Chk Imp API

OPEN COLLECTION

QuestDB HTTP REST Chk Settings API

OPEN COLLECTION

QuestDB HTTP REST Chk Write API

OPEN COLLECTION

QuestDB HTTP REST API

OPEN COLLECTION

Scroll for all 7

QuestDB API pricing

Not yet checked against QuestDB's own pricing page. Compiled by API Evangelist on 2026-05-08 from questdb.com/enterprise/; confirm before you rely on a figure. A free plan or tier is listed.

Plan	Price
QuestDB Open Source free	Free
QuestDB Enterprise enterprise	—
QuestDB BYOC (Bring Your Own Cloud) enterprise	—
QuestDB on AWS Marketplace (private offers) enterprise	—

Plan details, limits and sources →

Rate limits

HTTP REST default workers: see http.worker.count in server.conf workers
Postgres wire connections: see pg.net.connection.limit in server.conf connections
ILP TCP connections: see line.tcp.net.connection.limit in server.conf connections

Compiled by API Evangelist, not yet checked against QuestDB's documentation. All 4 limits →

Billed by: license-year · FinOps profile →

Pricing Plans 1

Published pricing tiers and plan structures.

QuestDB Plans Pricing

4 plans

PLANS

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.

QuestDB Finops

FINOPS

Spectral Rules 1

Spectral governance rulesets for linting and validating these APIs. Counts are the severity each rule declares, not results of running them.

QuestDB API Rules

64 rules · 61 error-severity 1 warn-severity 2 info-severity

SPECTRAL

Security Posture 2

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

QuestDB Authentication

http · 1 scheme

SECURITY

QuestDB Domain Security

TLSv1.3 · HSTS · DMARC

SECURITY

Agentic Access (API Evangelist recommendations) 1

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

QuestDB Agentic Access

6 operations · 2 acting

AGENTIC

Resources

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).
deliveryModel:
  model: open-core
  license: Apache-2.0
  license_evidence:
    repo: questdb/questdb
    spdx: Apache-2.0
    stars: 17350
  open_source: true
  commercial: true
  callable_host: false
  label: Open core · an OSS project plus a commercial hosted product
  confidence: medium
  source:
  - openapi
  - pricing
  - repository-license
  generated: '2026-09-25'
  method: derived
accessModel:
  pricing: freemium
  onboarding: self-serve
  trial: false
  try_now: true
  public: false
  gated: none
  gated_source:
  - onboarding
  label: Freemium · Self-serve signup
  confidence: medium
  source:
  - plans
  - authentication
  - security
  generated: '2026-11-13'
  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
tags_raw:
- Database
- Time-Series
- SQL
- Open Source
- Performance
- ILP
- PostgreSQL
- Open-Source
created: '2026-05-08'
modified: '2026-05-08'
specificationVersion: '0.23'
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: []
  tags_raw:
  - 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 API — frequently asked questions

Does QuestDB have an API?

Yes. APIs.io lists 10 APIs from QuestDB, including QuestDB HTTP REST API, QuestDB ILP TCP Ingestion and QuestDB ILP HTTP Ingestion, and 7 more.

Is there an OpenAPI specification for the QuestDB API?

Yes. APIs.io indexes 6 OpenAPI specifications for QuestDB, each linked for download from this page.

How do I authenticate with the QuestDB API?

QuestDB uses bearer-token authentication (http · 1 scheme). The details are profiled on APIs.io as QuestDB Authentication.

How much does the QuestDB API cost?

APIs.io lists 4 pricing plans for QuestDB, with each plan's price, limits and inclusions under Pricing on this page.

Is the QuestDB API ready for AI agents?

QuestDB has a Kin Score of 31.9 out of 100 (thin) and an Agent Readiness score of 17.9 (agent-aware), scored by API Evangelist on 2026-11-13.

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