Tenzro
Bridges

Bridge fee in TNZO.

Users pay cross-chain bridge fees in TNZO, the network’s native token, instead of needing destination-chain gas. The BridgeFeeOracle quotes the destination-native fee in TNZO; the BridgeFeeSponsor debits the user’s account and credits a deterministic per-adapter sponsorship-pool vault. A registered solver or relayer fronts the destination native fee against the pool.
STATUS
Substrate live; per-adapter wiring in progress
CRATE
tenzro-bridge
STABILITY
Stable substrate
REFERENCE
Cosmos ICS-29 / Hyperlane IGP / Polkadot AssetHub
01

Quote

Request a TNZO quote for the destination-native fee. The quote envelope carries the TNZO debit due, the spot rate at quote time, a TTL bound (default 60s), the backing oracle (chainlink_feed / governance / fallback), and a globally-unique quote id.

POST https://rpc.tenzro.network
{
  "jsonrpc": "2.0",
  "id": 1,
  "method": "tenzro_quoteBridgeFeeInTnzo",
  "params": [{
    "adapter": "ccip",
    "dest_chain": "eip155:1",
    "native_fee_smallest_unit": "1000000000000000"
  }]
}
02

Sponsorship pools

Each bridge adapter has a deterministic per-adapter pool vault address. The 20-byte address is computed as SHA-256("tenzro/bridge/sponsorship-vault" || adapter_str)[0..20] — same across every Tenzro node, survives all restarts.

POST https://rpc.tenzro.network
{
  "jsonrpc": "2.0",
  "id": 1,
  "method": "tenzro_listBridgeSponsorshipPools",
  "params": []
}
03

Fee oracles

Two oracle backings ship today. GovernanceSetFeeOracle reads operator-published per-(adapter, dest_chain) rate rows; mirrors Hyperlane’s StorageGasOracle (no on-chain price feed dependency). ChainlinkFeedFeeOracle derives the rate from (destination_native / USD) and (TNZO / USD)data feeds; falls back to the inner governance oracle when a feed isn’t configured. A markup (default 100 bps, governance-tunable) covers FX slippage.

04

Per-bridge wiring

Per-adapter wiring priority reflects each bridge’s native fee-token capability:

  • CCIP — Router.ccipSend()already accepts a feeToken argument; register TNZO on the Tenzro-side Router.
  • Hyperlane— custom TnzoIgp implementing IPostDispatchHook as the Tenzro-side default hook.
  • deBridge— already source-chain native; TNZO is the source input.
  • Wormhole— wrap paymentForExtraReceiverValue behind the sponsor.
  • LayerZero— OFT-Alt style TNZO feeToken on Endpoint deployment.
  • Axelar— use payGasForContractCall(gasToken=TNZO) ERC-20 path.
Related
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