diff --git a/README.md b/README.md
index e69de29..d476e43 100644
--- a/README.md
+++ b/README.md
@@ -0,0 +1,50 @@
+# chainconfig — IPI Single Source of Truth (SSOT)
+
+`config.json` jest **jedynym źródłem prawdy** parametrów sieci IPI.
+Wszystkie konsumenty (`wallet-core.js`, `ipi-rpc`, portfele Keplr-kompatybilne i aplikacje)
+powinny czytać wartości stąd, zamiast trzymać własne kopie chain-id / denom / endpointów.
+
+## Użycie
+
+```js
+import config, { getEndpoints, getChainId, validateConfig } from "chain";
+
+validateConfig();                 // rzuca wyjątek gdy brakuje wymaganych pól
+const { rpc, rest, grpc } = getEndpoints();
+const chainId = getChainId("testnet"); // "ipi-testnet-1"
+```
+
+Domyślny eksport to sparsowany obiekt `config.json` (import JSON).
+
+## Schemat pól
+
+| Pole | Typ | Opis |
+| --- | --- | --- |
+| `chainId` | string | Aktywny chain-id sieci głównej (`ipi-mainnet-2`). |
+| `chainName` | string | Czytelna nazwa sieci. |
+| `bip44.coinType` / `slip44` | number | SLIP-44 coin type (`118`, standard Cosmos). |
+| `bech32Config` | object | Pełny zestaw prefiksów bech32 (Keplr). |
+| `bech32Prefix` | string | Skrócony prefiks konta (`ipi`) — wygoda dla narzędzi. |
+| `currencies[]` | array | Waluty wyświetlane: `coinDenom`, `coinMinimalDenom`, `coinDecimals`. |
+| `feeCurrencies[]` | array | Jak wyżej + `gasPriceStep` (`low`/`average`/`high`). |
+| `stakeCurrency` | object | Waluta stakingu. |
+| `features[]` | array | Włączone moduły łańcucha (`stargate`, `cosmwasm`). |
+| `endpoints` | object | `rpc` / `rest` (LCD) / `grpc`. |
+| `blockTime` | number | Docelowy czas bloku (sekundy, wartość przybliżona). |
+| `explorer` | string | URL eksploratora. |
+| `networks` | object | Chain-id per sieć: `mainnet`, `testnet`. |
+
+## Denominacja
+
+Bazowy denom to `nipi` (nano-IPI), display `IPI`, `coinDecimals: 9`
+(1 IPI = 1 000 000 000 nipi).
+
+## Uwagi (DRAFT — do review po Fala 1 devnet)
+
+- `endpoints.grpc` (`ipicoin.eu:9090`) oraz `networks.testnet.chainId` (`ipi-testnet-1`)
+  to wartości robocze do potwierdzenia po uruchomieniu devnet.
+- `gasPriceStep` i `blockTime` — wartości domyślne do kalibracji.
+
+## Licencja
+
+Apache 2.0 © IPI DAO 2026. Maintainership: Sett Sarverott.
diff --git a/config.json b/config.json
index 5163176..02fe853 100644
--- a/config.json
+++ b/config.json
@@ -3,9 +3,11 @@
 	"chainName": "IPI Mainnet 2",
 	"rpc": "https://ipicoin.eu/rpc",
 	"rest": "https://ipicoin.eu/api",
+	"grpc": "https://ipicoin.eu:9090",
 	"bip44": {
 		"coinType": 118
 	},
+	"slip44": 118,
 	"bech32Config": {
 		"bech32PrefixAccAddr": "ipi",
 		"bech32PrefixAccPub": "ipipub",
@@ -14,6 +16,7 @@
 		"bech32PrefixConsAddr": "ipivalcons",
 		"bech32PrefixConsPub": "ipivalconspub"
 	},
+	"bech32Prefix": "ipi",
 	"currencies": [
 		{
 			"coinDenom": "IPI",
@@ -25,7 +28,12 @@
 		{
 			"coinDenom": "IPI",
 			"coinMinimalDenom": "nipi",
-			"coinDecimals": 9
+			"coinDecimals": 9,
+			"gasPriceStep": {
+				"low": 0.01,
+				"average": 0.025,
+				"high": 0.04
+			}
 		}
 	],
 	"stakeCurrency": {
@@ -33,5 +41,15 @@
 		"coinMinimalDenom": "nipi",
 		"coinDecimals": 9
 	},
-	"features": ["stargate", "cosmwasm"]
+	"features": ["stargate", "cosmwasm"],
+	"blockTime": 6,
+	"explorer": "https://ipicoin.eu",
+	"networks": {
+		"mainnet": {
+			"chainId": "ipi-mainnet-2"
+		},
+		"testnet": {
+			"chainId": "ipi-testnet-1"
+		}
+	}
 }
diff --git a/index.js b/index.js
index 1836517..935a6e6 100644
--- a/index.js
+++ b/index.js
@@ -1,6 +1,81 @@
 // on Apache license 2.0 @ IPI DAO 2026
 // maintainership by Sett Sarverott
 
-import chainConfiguration from "./config.json" with {type: 'json'};
+import chainConfiguration from "./config.json" with { type: "json" };
 
+/**
+ * Single Source of Truth (SSOT) for IPI network parameters.
+ * Consumed by wallet-core.js, ipi-rpc and downstream apps.
+ */
 export default chainConfiguration;
+
+export const config = chainConfiguration;
+
+/** Returns the network endpoints (rpc / rest / grpc) from the top-level SSOT fields. */
+export function getEndpoints(cfg = chainConfiguration) {
+	return {
+		rpc: cfg.rpc,
+		rest: cfg.rest,
+		grpc: cfg.grpc,
+	};
+}
+
+/** Returns the chain-id for a given network ("mainnet" | "testnet"). */
+export function getChainId(network = "mainnet") {
+	return chainConfiguration.networks?.[network]?.chainId ?? chainConfiguration.chainId;
+}
+
+/** Shape + value validation — throws on missing required fields or non-canonical values. */
+export function validateConfig(cfg = chainConfiguration) {
+	const required = [
+		"chainId",
+		"chainName",
+		"bech32Prefix",
+		"rpc",
+		"rest",
+		"grpc",
+		"currencies",
+		"feeCurrencies",
+		"stakeCurrency",
+	];
+	const missing = required.filter((key) => cfg[key] === undefined);
+	if (missing.length > 0) {
+		throw new Error(`chainconfig: missing required fields: ${missing.join(", ")}`);
+	}
+
+	// Value validation — enforce canonical IPI network parameters (SSOT invariants).
+	const errors = [];
+
+	if (typeof cfg.chainId !== "string" || cfg.chainId.trim() === "") {
+		errors.push("chainId must be a non-empty string");
+	}
+	if (cfg.bech32Prefix !== "ipi") {
+		errors.push(`bech32Prefix must be "ipi" (got ${JSON.stringify(cfg.bech32Prefix)})`);
+	}
+	if (cfg.bip44?.coinType !== 118) {
+		errors.push(`bip44.coinType must be 118 (got ${JSON.stringify(cfg.bip44?.coinType)})`);
+	}
+
+	// Every currency list entry must carry the canonical base denom + decimals.
+	const currencyGroups = {
+		currencies: cfg.currencies,
+		feeCurrencies: cfg.feeCurrencies,
+		stakeCurrency: cfg.stakeCurrency,
+	};
+	for (const [name, group] of Object.entries(currencyGroups)) {
+		const entries = Array.isArray(group) ? group : [group];
+		for (const entry of entries) {
+			if (entry?.coinMinimalDenom !== "nipi") {
+				errors.push(`${name}: coinMinimalDenom must be "nipi" (got ${JSON.stringify(entry?.coinMinimalDenom)})`);
+			}
+			if (entry?.coinDecimals !== 9) {
+				errors.push(`${name}: coinDecimals must be 9 (got ${JSON.stringify(entry?.coinDecimals)})`);
+			}
+		}
+	}
+
+	if (errors.length > 0) {
+		throw new Error(`chainconfig: invalid values: ${errors.join("; ")}`);
+	}
+	return true;
+}
diff --git a/package.json b/package.json
index ca10f21..b40ae24 100644
--- a/package.json
+++ b/package.json
@@ -13,7 +13,7 @@
 		"type": "git",
 		"url": "git+https://github.com/ipicoin/chainconfig.git"
 	},
-	"license": "ISC",
+	"license": "Apache-2.0",
 	"author": "IPI DAO",
 	"type": "module",
 	"main": "index.js",