Niche — API

API-first startups

API-first companies and integration platforms turning capability into a paid endpoint.

RS
Resend
Email API for developers — built on React.
Dev Tools
MT
Modern Treasury
Payment ops infrastructure for B2B businesses.
Fintech
IN
Increase
ACH, wires, real-time payments, and checks via one API.
Fintech
SU
Subsie
Non-custodial stablecoin billing that turns one-off crypto payments into recurring revenue.
Fintech
N8
n8n
Workflow automation for technical people.
Open Source
FW
Fireworks AI
Productive AI platform with the fastest inference.
AI
IF
Infisical
The open-source secret manager.
Open Source
RT
Retool
Build internal tools, remarkably fast.
SaaS
RM
ReadMe
Beautiful, personalized developer hubs.
SaaS
CO
Column
The first developer-first bank.
Fintech
ST
Stytch
Modern user authentication for developers.
Dev Tools
AP
Apidog
All-in-one API design, testing, and documentation.
Dev Tools
PM
Permit.io
Authorization as a service.
Dev Tools
TD
tldraw
Build whiteboards into your product.
Open Source
UK
Unkey
Open-source API authentication and authorization.
Open Source
DI
Directus
The instant headless CMS + data platform.
Open Source
PT
Patch
Climate action infrastructure.
Other
SU
Sure
Embedded insurance infrastructure.
Fintech
PR
PhotoRoom
AI image editing for commerce.
AI
RE
Relay
Business banking built for visibility.
Fintech
SF
Silverflow
Card payment processing for the cloud era.
Fintech
NV
Novu
Open-source notification infrastructure for developers
Dev Tools
ST
Stainless
Quality SDKs for your REST API
Dev Tools
BB
Browserbase
Headless browser infrastructure for AI agents
Dev Tools
EX
Exa AI
Neural search API designed for AI applications
AI
FC
Firecrawl
Web scraping API built for LLMs
Dev Tools
CH
Chroma
Open source AI-native embedding database
AI
LK
LiveKit
Open source WebRTC and real-time AI infrastructure
Dev Tools
NG
Nango
Open source platform for product integrations
Dev Tools
RA
Recall AI
Universal API to capture data from any meeting
AI
AP
Activepieces
Open source business automation platform
SaaS
BN
BentoML
Unified AI model serving and deployment framework
AI
SP
Speakeasy
Enterprise-grade SDKs and API tooling
Dev Tools
ZP
Zuplo
Programmable API gateway for developer teams
Dev Tools
HP
Hoppscotch
Open source API development ecosystem
Dev Tools
SG
Semgrep
Code security and static analysis at dev speed
Dev Tools
SC
Scalar
Beautiful open source API references and clients
Dev Tools
RW
Rows
The spreadsheet with superpowers and integrations
SaaS
AL
AnythingLLM
The all-in-one open source AI desktop application
AI
BM
Beam
Serverless infrastructure for AI and ML workloads
AI
TW
Twenty
Open source CRM built for modern teams
SaaS
TB
Typebot
Open source chatbot builder with powerful logic
SaaS
RQ
Requestly
Browser extension and proxy for API mocking and testing
Dev Tools
OS
OpenStatus
Open source monitoring and status page platform
Dev Tools
OL
Ollama
Run large language models locally
AI
OR
OpenRouter
Unified API for every major LLM
AI
PK
Portkey
AI gateway and LLMOps platform for production
AI
VA
Vapi
Voice AI infrastructure for developers
AI
KN
Knock
Flexible notification infrastructure for developers
Dev Tools
CO
Courier
Multi-channel notifications API for product teams
Dev Tools
BB
Budibase
Low-code platform for building internal apps fast
Dev Tools
WG
WunderGraph
API integration platform and GraphQL federation
Dev Tools
SM
Stitch
Payments and financial data API for Africa
Fintech
ES
Escape
API security testing and DAST for developers
Dev Tools
GG
Gorgias
Helpdesk built specifically for ecommerce brands
SaaS
MX
Mux
Video infrastructure API for developers
Dev Tools
MT
Mastra
The TypeScript framework for building AI agents
Dev Tools
GG
Gigs
Launch a mobile service that runs itself
SaaS
EN
Enode
One API to connect and control any energy device
SaaS
SL
Slash
Business banking built for internet entrepreneurs
Fintech
FN
Fun
Global stablecoin payments for modern fintechs
Fintech
CH
Chromatic
Visual testing and review for UI components
Dev Tools
SC
Shortcut
Project management software that developers love
SaaS
LC
LanceDB
Multimodal vector database for AI
Open Source
MI
MinIO
High-performance S3-compatible object storage
Open Source
MM
Mattermost
Open source Slack alternative for developers
Open Source
FS
Flagsmith
Feature flags and remote config for any platform
Open Source
UL
Unleash
The enterprise open source feature management solution
Open Source
SL
Saleor
Open source GraphQL-first e-commerce platform
Open Source
BB
Bytebase
Database DevOps and CI/CD for teams
Open Source
OW
Open WebUI
ChatGPT-style UI for any LLM
Open Source
LL
LiteLLM
Call 100+ LLMs with one interface
Open Source
OL
OpenLIT
Open source LLM observability and evaluation
Open Source
FW
Flowise
Drag-and-drop UI to build LLM flows
Open Source
LF
Langflow
Visual framework for building multi-agent AI apps
Open Source
BR
Bruno
Open source IDE for exploring APIs
Open Source
OT
Outline
Fast, collaborative, wiki-style knowledge base
Open Source
ME
Memos
Lightweight, self-hosted memo hub
Open Source
GT
GlitchTip
Open source error tracking
Open Source
OO
OpenObserve
Open source observability with 140x lower storage costs
Open Source
SC
Screenpipe
Source-available screen and audio memory for AI assistants
AI
SA
SuperAgent
Open source AI agent platform
Open Source
PS
Postal
Full-featured open source mail delivery server
Open Source
MT
Mautic
Open source marketing automation platform
Open Source
PE
Peach
API-first loan management platform
Fintech
NG
Ngrok
Ngrok
Dev Tools
CA
Cake AI
Cake AI
AI
FI
Finch
Finch
Fintech
PI
Pin
AI-powered recruitment platform
SaaS
PA
Paragon
Embedded integration platform for SaaS
Dev Tools
FI
Finmid
Embedded financing solutions for SMBs
Fintech
AA
Alloy Automation
Embedded iPaaS platform for product teams
Dev Tools
AR
Array
Embedded finance products platform
Fintech
PU
Pulse
Production-grade unstructured document extraction
Dev Tools
PA
Parafin
Embedded finance infrastructure for SMBs
Fintech
PL
Pliant
Corporate card platform
Fintech
ST
StackOne
Ship hundreds of integrations in days
Dev Tools
LE
Leen
Unified API for security tools and data
Dev Tools
RU
Rutter
Connecting the world's business data
Fintech
RA
Radical AI
aAccelerating materials R&D
AI
RI
Rillet
The AI-native ERP
Fintech
PY
Pylon
The support platform built for B2B
SaaS
ME
Merge
One API to 100s of integrations
Dev Tools
SY
Syenta
High-performance semiconductor chips
AI
IN
Inkeep
AI support you can trust
AI
PO
Polars
DataFrames for the new era
Dev Tools
RE
Reducto
Document ingestion API
Dev Tools
IN
Inference
Inference
Dev Tools
PO
Poolside
Frontier research to operational intelligence
AI
LE
Legend
Your gateway to decentralized finance
SaaS
LA
Langdock
The AI platform for your company
AI
LG
LGND
ChatGPT for the Earth
AI
JU
Junction
Modernizing healthcare infrastructure
SaaS
ME
Medra
Physical AI integrated in your lab
AI
TS
Truffle Security
Unearth your secrets
Dev Tools
RU
RunPod
Deploy full-stack AI applications
Dev Tools
AN
Anvil
Document SDK for product teams
Dev Tools
BO
Boxo
Turn apps into Super Apps
Dev Tools
DE
Defacto
B2B lending platform
Fintech
ST
Stuut
Turn your orders into cash
Fintech
GU
Gumloop
Automate any workflow with AI
SaaS
KE
Kernel
Browser infra for web agents and automations
Dev Tools
SU
Supermemory
Universal memory API for AI apps
Dev Tools