Production API · live now

AI and web data.
One reliable API.

Build agents, automations and data pipelines without managing separate LLM and scraping vendors. One key, prepaid spend control and exact usage settlement.

Explore B2B services · from 490 PLNCreate API accountRead the quickstart
No card required to start · Revoke keys instantly · Pay only for delivered usage
curl https://api.langswap.com/llm/v1/chat/completions \
  -H "Authorization: Bearer $LANGSWAP_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{
    "model": "openai/gpt-4o",
    "messages": [{"role":"user","content":"Analyze this market"}],
    "max_tokens": 500
  }'

200 OK · usage settled · unused reserve refunded
Prepaid onlyprovider called only after funds are reserved
HTTP 402before upstream when balance is insufficient
SHA-256API keys stored only as hashes
Stripe Livesigned, idempotent payment webhooks
One integration

Infrastructure your automation can depend on.

LangSwap combines model access and public web extraction behind one authenticated interface, with financial controls built into every request.

AI

OpenAI-compatible chat

Use GPT-4o, DeepSeek and Llama models through a familiar Chat Completions endpoint.

WEB

Managed web extraction

Retrieve allowlisted public HTTPS targets without maintaining proxy infrastructure or separate provider accounts.

$

Atomic prepaid billing

Worst-case cost is reserved first. Actual usage is settled and unused funds return automatically.

KEY

Scoped API keys

Create and revoke bearer keys instantly. Optional exact Origin allowlists protect browser integrations.

NET

SSRF protection

Private networks, embedded credentials, unsafe ports and non-HTTPS scraping targets are rejected.

SLA

Built for automation

Request IDs, clear error codes, activity history and support designed for production workflows.

Use cases

Useful from the first API call.

AI agents

Reason, summarize and classify with LLMs, then collect current public data through the same account.

E-commerce monitoring

Track public catalog and price changes across allowlisted stores without building a proxy stack.

SEO and research automation

Extract public pages and turn them into structured insights in a single backend workflow.

Localization pipelines

Translate and adapt content at scale while keeping a hard prepaid ceiling on model spend.

Transparent pay as you go

No subscription before you have usage.

Top up securely through Stripe before the first paid request. Failed delivery releases the reserved amount.

LLM Chat

$5 / $20
per 1M GPT-4o input / output tokens
  • Unused max-token reserve refunded
  • Usage and final price returned in every response
  • DeepSeek and Llama available on the same endpoint

Web Extraction

$0.001725
current standard price per delivered request
  • Managed provider routing
  • Optional geographic routing
  • Per-account target allowlist
Loss-safe settlement: if the available balance cannot cover the pessimistic request price, LangSwap returns HTTP 402 before calling the provider. Failed upstream delivery releases the reserved funds.
Three-minute setup

From registration to production request.

Create an account

Use a company email and receive a one-time API key.

Fund the prepaid balance

Top up securely through Stripe before any provider-backed request can run.

Scale with a hard ceiling

Copy the quickstart and set request limits. The gateway cannot spend money that is not reserved.

Questions

Know exactly what you are buying.

Do I need separate upstream accounts?

No. LangSwap manages the required provider integrations behind your LangSwap key.

Can a failed request consume my balance?

A failed upstream delivery releases the reservation. Successful calls are settled from actual usage.

Is browser-side use safe?

Secrets belong on your backend. Exact Origin allowlists add a second control for approved browser integrations.

Can I cap spending?

Yes. The service is prepaid and refuses execution when the worst-case reserve exceeds the available balance.

Ready to ship

Fund once. Start with a controlled scope.

Order a fixed-price AI, Stripe or API service, or create an API account and top up securely before the first provider-backed request.

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