> ## Documentation Index
> Fetch the complete documentation index at: https://docs.tachyon.pe/llms.txt
> Use this file to discover all available pages before exploring further.
# Tachyon: privacy-native cross-chain payments
> Tachyon is a privacy-native cross-chain payment protocol. Submit signed intents; Tachyon delivers confidentially across chains.
Tachyon is a privacy-native cross-chain payment protocol. You submit a signed *intent* describing what you want, for example, *"move 1,000 USDC from Arbitrum to this address on Base"*, and Tachyon handles the rest. Intent contents are end-to-end confidential: on-chain observers cannot link sender, recipient, amount, or route.
Where existing rails fall short:
* **Stablecoin settlement networks** give you movement but no privacy.
* **Single-chain confidential execution** gives you privacy but locks you to one VM.
* **Tachyon gives you both**, private settlement, chain-agnostic.
The protocol is VM-agnostic by design. EVM (secp256k1), SVM (Ed25519), Move (Aptos, Sui), and Canton are all handled by the same confidential machinery, and on-chain dependencies are minimal so new chains roll out in days. See [supported chains](/concepts/supported-chains) for the full list.
Tachyon is currently live on testnet. Mainnet is coming soon. Try all features at [testnet.app.tachyon.pe](https://testnet.app.tachyon.pe).
## Who integrates Tachyon
Add private send and receive as a first-class feature without rebuilding settlement.
Disburse to contributors across chains while keeping amounts and recipients confidential.
Pay HTTP 402 invoices from autonomous agents without exposing spending patterns.
Execute size over time without leaking strategy to on-chain observers.
## Core products
Tachyon ships four products on top of the same confidential settlement layer.
Transfer tokens between chains without revealing source, destination, or amount.
Run private salary streams and recurring payouts with auditor-controlled visibility.
Execute time-weighted average price orders without exposing strategy or schedule.
Confidential HTTP 402 payments for agents and APIs.
## How integrators use Tachyon
Today's flow is two steps: call `BridgeIntentV2.createIntent` on source chain (public solver-facing offer), then `POST /store-recipients` to the relayer (encrypted recipient bundle). Track the intent by polling `GET /intent-details/:intentId` until it reaches `completed`.
The SDK (WIP) wraps both into a single call. Under the hood the protocol batches your intent with others for solver broadcasting, and only re-encrypts recipient info to the solver that wins the bid.
```ts theme={null}
// Planned SDK surface
const { intentId } = await tachyon.intent.submit({
sourceChain: "base_mainnet",
destChain: "horizen_mainnet",
tokenIn: USDC_BASE, tokenOut: USDC_HORIZEN,
amountIn: 1_000_000_000n, minAmountOut: 999_000_000n, reward: 50_000_000n,
deadline: Math.floor(Date.now() / 1000) + 600,
recipients: [{ address: "0xRecipient...", amount: 999_000_000n }],
}, wallet);
tachyon.intent.subscribe(intentId, (intent) => {
if (intent.status === "completed") console.log(intent.settleTxHash);
});
```
Install the SDK and submit your first testnet intent.
## What's guaranteed, what's public
Tachyon gives you **recipient-side confidentiality**. The sender's on-chain action is visible on the source chain; the recipient and the linkage between sender and recipient are not.
| | On-chain (source) | Solvers (pre-bid, batched) | Post-bid (winning solver only) |
| -------------------------- | ---------------------------- | -------------------------- | ----------------------------------------------- |
| Sender | ✓ | | |
| Token pair, amount, reward | ✓ | Batched with others | ✓ |
| Destination chain | ✓ | ✓ | ✓ |
| Recipient | Encrypted blob (relayer key) | | ✓ (re-encrypted to solver) |
| Permit signatures | | | ✓ |
| Sender ↔ recipient linkage | | | Solver sees both, but only for intents they won |
The encrypted blob in the on-chain event is the protocol's recovery anchor, it's only decryptable with the relayer key, which lets state be re-traced from on-chain history if the relayer is ever lost.
See [privacy guarantees](/concepts/privacy-guarantees) for the full breakdown and threat model.
## Where to go next
Submit your first intent on testnet.
Mental model: intents, solvers, stealth addresses, settlement.
Install, authenticate, submit, track, retrieve.
Schemas, errors, rate limits.