absolutepay

Official AbsolutePay API client for Node.js. Server-side only — your API key and signing secret must never reach a browser.

Every request from an app key is HMAC-signed automatically. Inbound webhooks are verified with one call.

Install

npm install absolutepay
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Requires Node 18+ (uses the global fetch and node:crypto).

Environments

Config	Base URL
default	https://api.absolutepay.io (production)
sandbox: true	https://sandbox-api.absolutepay.io
baseUrl: "https://…"	your override (takes precedence over sandbox)

Use a dedicated sandbox app (sign up at sandbox.absolutepay.io) with sandbox: true to test end-to-end without moving real funds.

Quickstart

import { AbsolutePay } from "absolutepay";

const ap = new AbsolutePay({
  apiKey: process.env.ABSOLUTEPAY_API_KEY!,       // ap_live_… / ap_test_…
  signingSecret: process.env.ABSOLUTEPAY_SIGNING_SECRET!, // apisign_…  (required for app keys)
  // sandbox: true,                // → https://sandbox-api.absolutepay.io (default is production)
  // baseUrl: "https://…",         // optional: override the origin entirely (wins over `sandbox`)
});

const { items: balances } = await ap.balances.list();
const preview = await ap.fees.preview({ amount: "100", currency: "USDT" });
// Withdrawal/payout fees are per-chain — pass `chain`:
const payoutFee = await ap.fees.preview({ amount: "100", currency: "USDT", paymentType: "WITHDRAWAL", chain: "MATIC" });

// Hosted checkout — the payer picks the asset/chain on the /pay/<token> page:
const checkout = await ap.checkouts.create({
  reference: "order-123",
  amount: { amount: "25.00", currency: "USDT" },
  redirectUrl: "https://shop.example.com/thanks", // payer returns here with ?token=…&status=… when done
});
console.log(checkout.checkoutUrl); // redirect the payer here
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Conventions

• Lists take { limit?, before?, order?, ...filters } and return the raw { items, nextCursor }. Page forward by echoing nextCursor back as before; nextCursor: null is the last page. The ledger-history lists (refunds.list, conversions.list, reconciliation.*) also carry total.
• Money POSTs accept a second { idempotencyKey } argument that sets the Idempotency-Key header — retrying with the same key + body replays the original response (a different body returns 409). Applies to payouts.create, refunds.create, conversions.execute, offramp.withdraw, giftcards.create, subscriptions.create, subscriptions.plans.create.
• Errors parse the { code, title, detail } body into AbsolutePayError.

Resources

Namespace	Highlights
ap.balances	list() → { items }
ap.fees	preview({ amount, currency, paymentType?, chain? }) — chain required for WITHDRAWAL/PAYOUT
ap.checkouts	create(...), list(query), get(token), update(token, patch), del(token)
ap.invoices	create(...) (chain required), list(query), get(token), update(token, patch), del(token)
ap.deposits	chains(), createAddress({ chain }), addresses(query), getAddress(chain), list(query)
ap.payouts	create(items, { idempotencyKey? }), options({ currency }), get(id)
ap.refunds	create(..., { idempotencyKey? }), get(id), list(query)
ap.conversions	quote(...), execute(..., { idempotencyKey? }), list(query)
ap.subscriptions	create(..., { idempotencyKey? }), list(query), deductions(no), cancel(no), plans.list(), plans.create(..., { idempotencyKey? })
ap.giftcards	templates(), list(query), get(num), create(..., { idempotencyKey? })
ap.offramp	countries(), banks(), registerBank(...), removeBank(id), quote(...), withdraw(..., { idempotencyKey? }), orders(query)
ap.reconciliation	payments(query), withdrawals(query) → { items, total, nextCursor }

Checkouts vs invoices

• ap.checkouts — a hosted link where the payer picks the asset/chain on the /pay/<token> page. create(...) returns { token, checkoutUrl }.
• ap.invoices — the up-front flow: pass the required chain and the deposit address is minted immediately. create(...) returns { token, address, chain, currency, amount }.

Both support the same list / get / update / del CRUD (update patches paused / redirectUrl / expiresAt / description; send null to clear a field; del voids the link).

const invoice = await ap.invoices.create({
  reference: "order-123",
  amount: { amount: "25.00", currency: "USDT" },
  chain: "TRON", // mint a deposit address up front
});
console.log(invoice.address);

await ap.checkouts.update(checkout.token, { paused: true }); // pause; { paused: false } resumes
await ap.checkouts.del(checkout.token); // void
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Confirm settlement via the payment.succeeded webhook (see below) or by polling ap.checkouts.get(token).

Deposits (own-balance top-ups)

const { items: chains } = await ap.deposits.chains();
const address = await ap.deposits.createAddress({ chain: "ETH" }); // mint-or-return, idempotent
const { items: history } = await ap.deposits.list({ chain: "ETH" }); // settled deposit history
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Webhooks

Verify the signature and parse the event in one call. Pass the raw request body and your app's callback secret (whsec_…).

import { constructEvent } from "absolutepay";

// e.g. inside an Express handler with express.raw()
// Verifies the HMAC signature AND enforces a 5-minute freshness window by default (replay defense).
// Pass { toleranceMs: 0 } to disable the time check; de-dupe on event.id for full idempotency.
const event = constructEvent(rawBody, req.headers, process.env.ABSOLUTEPAY_WEBHOOK_SECRET!);
if (event.type === "payment.succeeded") {
  // fulfill the order — event.data has the order details
}
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Errors

Non-2xx responses throw AbsolutePayError with status, code, title, detail, and requestId, plus isAuth / isRateLimited helpers.

import { AbsolutePayError } from "absolutepay";
try {
  await ap.payouts.create({ items: [...] });
} catch (e) {
  if (e instanceof AbsolutePayError && e.isRateLimited) { /* back off */ }
}
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Contract

Types track the published OpenAPI contract in openapi/absolutepay.json (regenerate with bun run gen).

License

MIT © AbsolutePay