What is ChainAPI?

The problem

Modern SaaS backends are multi-role and deeply interconnected. To test a single endpoint, developers and QAs often need to:

Log in as multiple actors (admin, vendor, customer, manager)
Chain 3–6 API calls to obtain prerequisite IDs
Manually copy tokens and IDs between Postman/Bruno/Insomnia tabs
Repeat this every time tokens expire or test data is reset

A representative example — testing “admin approves a customer refund” in a marketplace API requires this chain:

Admin login            → admin_token
Vendor login           → vendor_token + vendor_id
Customer login         → customer_token + customer_id
Create product         → product_id            (vendor)
Place order            → order_id              (customer)
Pay for order          → payment_id            (customer)
Request refund         → refund_id             (customer)
Approve refund         ← target endpoint       (admin)

That’s 8 manual requests with 7 IDs to copy-paste, just to test one endpoint. Across a feature with 20 endpoints, this is hours of mechanical work per test cycle.

Why existing tools fall short

Tool	Limitation
Postman	Manual scripting; collections grow unwieldy; no actor abstraction
Postman Flows	Visual flows require wiring every relationship by hand
Bruno	Same scripting model as Postman; git-friendly but no dependency awareness
Insomnia	Manual chaining; no role/actor abstraction
Hurl / Stepci	Linear scripts; require authoring entire workflows for every endpoint
Apidog	Better than Postman but still requires manual workflow definition

None of them model the API as a dependency graph. They treat it as a flat list of requests.

What ChainAPI does

ChainAPI treats your API as a graph of resources, actors, and dependencies. Define each actor (auth flow) and each resource (endpoints + dependencies) once. Then click any endpoint and the engine auto-resolves the entire chain — login, prerequisites, target call — and executes them in the correct order.

The same schema also powers an AI importer that reads your existing API documentation (OpenAPI, Markdown, curl logs) and bootstraps the project in minutes.

Who it’s for

Backend engineers testing their own endpoints during development
QA engineers running regression flows across admin, web, and mobile
Solo developers building multi-role SaaS who hit the same pain on every project

What it isn’t

A replacement for Postman in single-request, ad-hoc exploration
A load testing tool (use k6 / Gatling)
A real-time collaboration tool (yet — git is the sharing model today)

How it compares

ChainAPI’s wedge is multi-actor SaaS APIs — the dominant shape of modern backend work. Tools that don’t model actors as a first-class concept end up with a forest of scripts that nobody owns. ChainAPI’s schema makes the actor abstraction load-bearing, so the dependency graph becomes maintainable.