For engineers

A developer experience we'd want to use.

Typed SDKs, signed webhooks, test mode with deterministic replay, and a CLI that actually works. If Stripe's DX is your bar, we built to match it.

5-minute quickstart API reference

Install once, integrate in an afternoon.

Every SDK is generated from the same OpenAPI spec. Test in test mode, replay events deterministically, go live when you're ready.

CLI that logs in, tails events, and replays webhooks
Idempotency keys and signed webhooks out of the box
Event replay — not a mock, the real event stream
Versioned API with deprecation windows, never forced upgrades

install

# Node
npm install @opensettle/sdk

# Python
pip install opensettle

# Go
go get github.com/opensettle/opensettle-go

# CLI
brew install opensettle

Code

One API. Four languages. Same shape.

node

import { OpenSettle } from "@opensettle/sdk";

const os = new OpenSettle({ apiKey: process.env.OPENSETTLE_SECRET });

const sub = await os.subscriptions.create({
  customer: "cus_9fX0a2E1",
  price: "price_pro_monthly",
  settlement: { chain: "base", token: "USDC" },
  autopay: "allowance",
});

python

import opensettle

os = opensettle.Client(api_key=os.environ["OPENSETTLE_SECRET"])

sub = os.subscriptions.create(
    customer="cus_9fX0a2E1",
    price="price_pro_monthly",
    settlement={"chain": "base", "token": "USDC"},
    autopay="allowance",
)

webhook-verify.ts

import { verifyWebhook } from "@opensettle/sdk";

app.post("/webhook", (req, res) => {
  const event = verifyWebhook(
    req.body,
    req.header("opensettle-signature"),
    process.env.WEBHOOK_SIGNING_SECRET,
  );

  if (event.type === "payment.confirmed") {
    // Mark order paid, send receipt
  }

  res.sendStatus(200);
});

cli

# Tail live events
$ opensettle events tail

# Trigger a test event
$ opensettle events trigger payment.confirmed

# Replay a past event
$ opensettle events replay evt_1Hx3Z...

# Port-forward webhooks to localhost
$ opensettle listen --forward-to http://localhost:3000/webhook