What is IDRX?
Learn about IDRX — the first Indonesian Rupiah stablecoin, pegged 1:1 to IDR, available on Base and Polygon networks.
IDRX is a stablecoin pegged 1:1 to the Indonesian Rupiah — 1 IDRX is always worth Rp 1. It's the first and most widely adopted Rupiah stablecoin in the crypto ecosystem, fully backed by fiat reserves and government bonds with regular third-party audits, and its smart contracts have been audited by CertiK.
Why Merchants Care
- No FX confusion — price your content in IDR and receive exactly that value, with no conversion step
- Instant settlement — IDRX lands in your wallet on-chain, immediately
- Indonesian Rupiah native — the only major stablecoin pegged directly to IDR rather than USD
40,000+ holders
$190M+ USD
Indodax & Tokenomy
How IDRX Works in TransX402
Merchants set a price in IDR (e.g. Rp 5,000) → the JS library converts it to IDRX units automatically → the buyer pays IDRX from their wallet → settlement happens directly on-chain on Base. Since 1 IDRX = Rp 1, there's never an exchange rate to worry about.
Permit2 in Practice
IDRX is a standard ERC-20 token without native gasless-transfer support, so it relies on Permit2 for one-time approval, after which every payment is a free off-chain signature. See What is x402? for the full authorization flow — the TransX402 JS library handles the approval prompt automatically.
Technical Reference
| Property | Detail |
|---|---|
| Type | ERC-20 |
| Peg | 1 IDRX = Rp 1 (IDR) |
| Decimals | 18 |
| Authorization method | Permit2 |
| Primary networks | Base, Polygon |
| Network | Contract Address |
|---|---|
| Base (primary) | 0x18Bc5bcC660cf2B9cE3cd51a404aFe1a0cBD3C22 |
| Polygon | 0x649a2DA7B28E0D54c13D5eFf95d3A660652742cC |
| BNB Chain | 0x649a2DA7B28E0D54c13D5eFf95d3A660652742cC |
| Lisk | 0x18Bc5bcC660cf2B9cE3cd51a404aFe1a0cBD3C22 |
| World Chain | 0x18bc5bcc660cf2b9ce3cd51a404afe1a0cbd3c22 |
TransX402 uses IDRX on Base by default for the lowest transaction fees and the best compatibility with the x402 ecosystem.
Regulatory Landscape
As of January 2025, crypto oversight in Indonesia transferred from Bappebti to OJK (Financial Services Authority), and regulations specific to local-currency-backed stablecoins are still being developed. Bank Indonesia is separately developing the Digital Rupiah (CBDC) through Project Garuda, with a pilot program running through 2026 — IDRX positions itself as a sovereign stablecoin alternative, noting that 99% of Indonesian crypto investors still use dollar-backed stablecoins today.
See Cashing Out for how to convert IDRX received through TransX402 into bank Rupiah via licensed exchanges.