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type Express,
type NextFunction,
type Request,
type Response,
} from "express";
import {
paymentMiddleware,
x402ResourceServer,
} from "@okxweb3/x402-express";
import { ExactEvmScheme } from "@okxweb3/x402-evm/exact/server";
import { OKXFacilitatorClient } from "@okxweb3/x402-core";
import { buildCatalog } from "./catalog.js";
import { CHAIN_ID, PRICE_USD } from "./config.js";
import {
buildPreIpo,
buildPreview,
buildRunners,
buildSignal,
buildUniverse,
} from "./intel/builders.js";
import {
validatePreIpoInput,
validateRunnersInput,
validateSignalInput,
} from "./intel/input.js";
import type { UniverseProvider } from "./intel/types.js";
import { isNyseOpen } from "./core/rules/marketHours.js";
import { log } from "./log.js";
import type { PaymentScanState } from "./payments.js";
export interface FakeFacilitator {
getSupported(): Promise<unknown>;
verify(): Promise<unknown>;
settle(): Promise<unknown>;
}
export function challengeOnlyFacilitator(network: string): FakeFacilitator {
return {
async getSupported() {
return {
kinds: [
{
x402Version: 2,
scheme: "exact",
network: network as `${string}:${string}`,
},
],
extensions: [],
signers: {},
};
},
async verify() {
throw new Error("payments not configured");
},
async settle() {
throw new Error("payments not configured");
},
};
}
export interface AppDeps {
env: {
NETWORK: string;
PAY_TO: string;
PUBLIC_API_BASE_URL: string;
WEB_ORIGIN: string;
};
universe: UniverseProvider;
facilitator?: { apiKey: string; secretKey: string; passphrase: string } | FakeFacilitator;
syncFacilitatorOnStart?: boolean;
payments?: () => PaymentScanState;
}
const startedAt = Date.now();
export function createApp(deps: AppDeps): Express {
const app = express();
app.set("trust proxy", true);
app.use(express.json());
app.use((req: Request, res: Response, next: NextFunction) => {
res.setHeader("access-control-allow-origin", deps.env.WEB_ORIGIN);
res.setHeader("access-control-allow-methods", "GET, POST, OPTIONS");
res.setHeader(
"access-control-allow-headers",
"content-type, payment-signature, x-payment",
);
res.setHeader(
"access-control-expose-headers",
"PAYMENT-REQUIRED, PAYMENT-RESPONSE",
);
if (req.method === "OPTIONS") {
res.sendStatus(204);
return;
}
next();
});
app.use((req: Request, _res: Response, next: NextFunction) => {
log("info", "request", { method: req.method, path: req.path });
next();
});
app.get("/health", (_req, res) => {
const market = isNyseOpen(new Date());
const universe = deps.universe.status?.() ?? {
ready: deps.universe.snapshot() !== null,
perps: 0,
spots: 0,
preIpo: 0,
candlesRefreshedAt: null,
tickersRefreshedAt: null,
};
res.json({
status: "ok",
service: "UltraX",
network: deps.env.NETWORK,
payTo: deps.env.PAY_TO,
paymentsConfigured: Boolean(
deps.facilitator && "apiKey" in deps.facilitator,
),
universe,
usMarketOpen: market.open,
uptime: Math.floor((Date.now() - startedAt) / 1000),
});
});
app.get("/catalog", (_req, res) => {
res.json(
buildCatalog(
deps.env.PUBLIC_API_BASE_URL,
deps.env.NETWORK,
deps.env.PAY_TO,
),
);
});
app.get("/universe", (_req, res) => {
const snapshot = deps.universe.snapshot();
if (!snapshot) {
res.status(503).json({ error: "universe warming up" });
return;
}
res.json(buildUniverse(snapshot));
});
app.get("/preview", async (_req, res) => {
const snapshot = deps.universe.snapshot();
if (!snapshot) {
res.status(503).json({ error: "universe warming up" });
return;
}
res.json(await buildPreview(snapshot));
});
app.get("/payments/recent", (req, res) => {
const requestedLimit = Number(req.query.limit ?? 20);
const limit = Math.min(
Number.isFinite(requestedLimit) ? Math.max(1, requestedLimit) : 20,
50,
);
const snap = deps.payments?.() ?? {
warming: false,
scannedFrom: null,
lastScanned: null,
payments: [],
};
const recent = snap.payments.filter(
(payment) => payment.timestamp >= Date.now() - 86_400_000,
);
res.json({
payTo: deps.env.PAY_TO,
count24h: recent.length,
totalUsd24h:
Math.round(
recent.reduce((sum, payment) => sum + payment.amountUsd, 0) * 100,
) / 100,
warming: snap.warming,
scannedFrom: snap.scannedFrom,
lastScanned: snap.lastScanned,
payments: snap.payments.slice(0, limit),
});
});
const respondValidation = (
res: Response,
validation:
| { ok: true }
| { ok: false; error: string }
| { ok: false; missing: string[]; required: unknown },
) => {
if (validation.ok) return false;
if ("missing" in validation) {
res.status(400).json({
status: "input_required",
missing: validation.missing,
required: validation.required,
});
return true;
}
const hint = validation.error.includes("symbol")
? { hint: "GET /universe" }
: {};
res.status(400).json({ error: validation.error, ...hint });
return true;
};
app.post("/runners", (req, res, next) => {
const validation = validateRunnersInput(req.body);
if (respondValidation(res, validation)) return;
if (!deps.universe.snapshot()) {
res.status(503).json({ error: "universe warming up" });
return;
}
next();
});
app.post("/signal", (req, res, next) => {
const snapshot = deps.universe.snapshot();
const validation = validateSignalInput(req.body, snapshot ?? undefined);
if (respondValidation(res, validation)) return;
if (!snapshot) {
res.status(503).json({ error: "universe warming up" });
return;
}
next();
});
app.post("/preipo", (req, res, next) => {
const snapshot = deps.universe.snapshot();
const validation = validatePreIpoInput(req.body, snapshot ?? undefined);
if (respondValidation(res, validation)) return;
if (!snapshot) {
res.status(503).json({ error: "universe warming up" });
return;
}
next();
});
const usingRealFacilitator = Boolean(
deps.facilitator && "apiKey" in deps.facilitator,
);
const facilitator = usingRealFacilitator
? new OKXFacilitatorClient({
...(deps.facilitator as {
apiKey: string;
secretKey: string;
passphrase: string;
}),
syncSettle: true,
})
: ((deps.facilitator as FakeFacilitator | undefined) ??
challengeOnlyFacilitator(deps.env.NETWORK));
const paymentServer = new x402ResourceServer(
facilitator as unknown as ConstructorParameters<typeof x402ResourceServer>[0],
).register(
deps.env.NETWORK as `${string}:${string}`,
new ExactEvmScheme(),
);
paymentServer.onAfterSettle(async (ctx) => {
const result = ctx.result as {
transaction?: string;
payer?: string;
amount?: string;
};
log("info", "payment settled", {
txHash: result.transaction,
payer: result.payer,
amount: result.amount,
});
});
if (!usingRealFacilitator) {
log("warn", "payments cannot be verified; 402 challenges still issued", {
job: "x402",
});
}
app.use(
paymentMiddleware(
{
"POST /runners": {
accepts: [
{
scheme: "exact",
network: deps.env.NETWORK as `${string}:${string}`,
payTo: deps.env.PAY_TO as `0x${string}`,
price: `$${PRICE_USD.runners}`,
},
],
description: "OKX stock market runners",
mimeType: "application/json",
},
"POST /signal": {
accepts: [
{
scheme: "exact",
network: deps.env.NETWORK as `${string}:${string}`,
payTo: deps.env.PAY_TO as `0x${string}`,
price: `$${PRICE_USD.signal}`,
},
],
description: "OKX stock predictive intelligence signal",
mimeType: "application/json",
},
"POST /preipo": {
accepts: [
{
scheme: "exact",
network: deps.env.NETWORK as `${string}:${string}`,
payTo: deps.env.PAY_TO as `0x${string}`,
price: `$${PRICE_USD.preipo}`,
},
],
description: "OKX stock pre-IPO intelligence",
mimeType: "application/json",
},
},
paymentServer,
undefined,
undefined,
deps.syncFacilitatorOnStart ?? true,
),
);
app.post("/runners", (req: Request, res: Response) => {
const validation = validateRunnersInput(req.body);
const snapshot = deps.universe.snapshot();
if (!validation.ok || !snapshot) {
res.status(503).json({ error: "universe warming up" });
return;
}
res.json(buildRunners(snapshot, validation.value));
});
app.post("/signal", async (req: Request, res: Response) => {
const snapshot = deps.universe.snapshot();
if (!snapshot) {
res.status(503).json({ error: "universe warming up" });
return;
}
const validation = validateSignalInput(req.body, snapshot);
if (!validation.ok) {
respondValidation(res, validation);
return;
}
try {
res.json(
await buildSignal(
snapshot,
validation.value.symbol,
validation.value.period,
(instId) => deps.universe.positioning(instId),
deps.universe.orderBook
? (instId) => deps.universe.orderBook!(instId)
: undefined,
),
);
} catch (error) {
log("error", "signal failed", { err: String(error) });
res.status(503).json({ error: "signal unavailable" });
}
});
app.post("/preipo", async (req: Request, res: Response) => {
const snapshot = deps.universe.snapshot();
if (!snapshot) {
res.status(503).json({ error: "universe warming up" });
return;
}
const validation = validatePreIpoInput(req.body, snapshot);
if (!validation.ok) {
respondValidation(res, validation);
return;
}
try {
res.json(
await buildPreIpo(
snapshot,
validation.value.symbol,
deps.universe.orderBook
? (instId) => deps.universe.orderBook!(instId)
: undefined,
),
);
} catch (error) {
log("error", "pre-IPO request failed", { err: String(error) });
res.status(503).json({ error: "pre-IPO data unavailable" });
}
});
return app;
}
|