The best backend you never wrote

Describe your API.
Deploy it. Done.

Swaigen turns a prompt and a JSON schema into a live REST endpoint — backed by any LLM and your existing tools. No backend code written.

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# ↳ Send JSON from your frontend or server gateway
curl -X POST https://api.swaigen.com/v1/execute/prj_123/support-agent \
  -H "Authorization: Bearer sw_live_..." \
  -H "Content-Type: application/json" \
  -d '{
    "input": {
      "user_message": "My package never arrived, I need a refund!",
      "order_number": 8912,
      "user_id": 105
    }
  }'

# ↳ Get typed JSON ready to feed directly into your internal APIs (like Salesforce or Postgres):
{
  "intent": "missing_package",
  "action_required": "initiate_carrier_claim",
  "parameters": {
    "order_id": 8912,
    "carrier_contact_required": true
  },
  "escalate_to_human": true
}

Your backend endpoint in 3 steps

No route handlers. No SDK wiring. No infra to manage.

Define your contract

Set an input schema, output schema, and write what the endpoint should do in plain English.

Connect your tools

Plug in MCP servers for Postgres, GitHub, Notion, Slack — or any internal API. Swaigen handles tool discovery automatically.

Ship a typed REST endpoint

Swaigen returns guaranteed JSON matching your schema. Call it from any language, framework, or frontend.

Everything your backend would do — without the code

Swaigen handles orchestration, validation, key management, billing, and tool execution. You handle the product.

No Route Handlers

Stop writing Express routes, validation middleware, and business logic. Describe what the endpoint does, and it ships.

Vaulted API Keys

LLM provider keys are encrypted at rest with AES-256-GCM and never exposed to clients.

MCP Tool Access

Connect databases, CRMs, or any internal service via Model Context Protocol. Your endpoint gets live tool access automatically.

Guaranteed JSON Output

Responses are validated against your schema on every call with automatic retries if the model drifts. Your endpoints are typed and structured.

Replace entire categories of backend code

Any endpoint whose logic can be described shouldn't have to be coded.

Internal Tooling & Ops

Self-serve APIs for non-engineers

Ops, data, and customer success teams have a permanent backlog of tool requests that engineering never ships. What if instead of Grafana boards or Datadog visualizations, they could define what they see? Swaigen lets them define what an endpoint does in plain English, plug in a Postgres or Notion MCP server, and get a live REST endpoint — without writing a single line of code.

Instructions (plain English):

"Look up this customer's last 5 orders from Postgres. Return total spend, most purchased category, and whether they're at churn risk."

↓ Swaigen generates a live REST endpoint ↓

{ "total_spend": 4820.00, "top_category": "Electronics", "churn_risk": true }

SaaS AI Feature Rollout

Ship AI features without touching your core stack

Add AI-powered endpoints to your SaaS without rewriting your backend. Swaigen sits in front of your existing services and adds intelligence to your endpoints for summarization, classification, enrichment, and generation that you can call via standard REST from your existing frontend.

Before Swaigen:

500+ lines of LangChain glue code, custom retry logic, prompt versioning, schema parsing...

↓ After ↓

POST /v1/execute/prj_x/smart-summary → { "summary": "...", "tags": [...] }

Legacy API Modernization

Breathe life into old systems

Wrap a decade-old SOAP or REST service in an MCP server and connect it to Swaigen. Instantly expose a modern, typed, natural-language-capable endpoint to your frontend — without touching the legacy system.

{ "query": "Cancel order #12345 and issue refund" }

↓ Swaigen calls your legacy SOAP tool via MCP ↓

{ "status": "success", "refund_amount": 45.00, "eta": "3-5 days" }

Your next 10 API endpoints shouldn't require a single line of code.

Start free. No credit card required. Ship your first endpoint in under 5 minutes.

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Describe your API. Deploy it. Done.