Add NYM swap provider

CHANGELOG.md

@@ -2,6 +2,8 @@
 
 ## Unreleased
 
+- added: NYM centralized swap integration (testnet)
+
 ## 2.46.0 (2026-04-18)
 
 - changed: Migrate Thorchain swap endpoints off NineRealms (thornode, tx tracker, Midgard sync fallback).

src/index.ts

@@ -8,6 +8,7 @@ import { makeExolixPlugin } from './swap/central/exolix'
 import { makeGodexPlugin } from './swap/central/godex'
 import { makeLetsExchangePlugin } from './swap/central/letsexchange'
 import { makeNexchangePlugin } from './swap/central/nexchange'
+import { makeNymPlugin } from './swap/central/nym'
 import { makeSideshiftPlugin } from './swap/central/sideshift'
 import { makeSwapuzPlugin } from './swap/central/swapuz'
 import { makeXgramPlugin } from './swap/central/xgram'
@@ -39,6 +40,7 @@ const plugins = {
   letsexchange: makeLetsExchangePlugin,
   lifi: makeLifiPlugin,
   nexchange: makeNexchangePlugin,
+  nymswap: makeNymPlugin,
   rango: makeRangoPlugin,
   sideshift: makeSideshiftPlugin,
   spookySwap: makeSpookySwapPlugin,

src/mappings/nym.ts

@@ -0,0 +1,38 @@
+/**
+ * NYM Exchange Plugin Chain Mapping
+ *
+ * Maps EdgeCurrencyPluginId -> NYM `chainNetwork` identifier (or null when the
+ * chain is not offered by NYM).
+ *
+ * NYM exposes an "Edge Partner API" whose asset references mirror Edge's own
+ * model: a `chainNetwork` string, an optional EVM `chainId`, and an optional
+ * `tokenId` (the 0x contract address). `chainNetwork` is the network *family*
+ * name; for EVM chains the `chainId` (taken from the wallet's `evmChainId` at
+ * quote time) distinguishes mainnet from testnet. On the current testnet API,
+ * Sepolia is therefore `chainNetwork: 'ethereum'` + `chainId: 11155111`, which
+ * is why the Edge `sepolia` pluginId maps to `'ethereum'` below.
+ *
+ * Every NYM swap must have the NYM asset (`chainNetwork: 'sandbox'`, Edge
+ * pluginId `nym`) on one side; this is enforced in ../swap/central/nym.ts.
+ *
+ * NYM is testnet-only for now. The authoritative list of supported assets is
+ * `GET /api/partner/v1/currencies`; the entries below reflect that testnet list
+ * (BTC, LTC, ZEC, DASH, Sepolia ETH/USDC, ADA, NYM) and should be expanded
+ * (including mainnet `ethereum` with chainId 1) when NYM launches mainnet.
+ *
+ * See https://nym-swap-testnet-api.nymte.ch/api/docs/ for the API docs.
+ */
+
+import { EdgeCurrencyPluginId } from '../util/edgeCurrencyPluginIds'
+
+export const nym = new Map<EdgeCurrencyPluginId, string | null>()
+nym.set('bitcoin', 'bitcoin')
+nym.set('cardano', 'cardano')
+nym.set('dash', 'dash')
+nym.set('litecoin', 'litecoin')
+// The NYM asset itself (testnet "sandbox" network).
+nym.set('nym', 'sandbox')
+// Sepolia is the only EVM testnet NYM supports; chainId 11155111 is supplied
+// from the wallet's evmChainId at quote time.
+nym.set('sepolia', 'ethereum')
+nym.set('zcash', 'zcash')