Relay and fomo

At a glance Infrastructure provider

Link to fomo

Cross-chain routing for fomo's EVM trades, as described in DefiLlama's fomo adapters

Official site

relay.link

What Relay is

Relay’s docs describe it as “a developer platform” that lets apps “swap, pay, and transact across every blockchain from a single onchain balance.” For a cross-chain order, “a solver uses its own capital to complete the requested action on the destination chain”: a solver is a market participant that fronts the funds on the other chain and is repaid from your deposit. Deposits on the settlement protocol go into a Relay Depository contract. Relay also lets an app add its own app fees to a route, collected in USDC.

How fomo uses it, according to public data

fomo’s help centre says only that “fomo handles the routing behind the scenes”. The detail comes from DefiLlama’s open-source adapters for fomo, which read Solana transactions directly and fomo’s EVM fees from a table fomo publishes:

• Buys on an EVM network are “sponsored USDC deposits into the Relay depository” on Solana. The depository’s USDC account is owned by 7uTT8Xi5RWXzy7h9XL244GRgEycDYDhLjr3ZyNdXi8pZ.
• Sells are “USDC fills from Relay solvers into FOMO user wallets” back on Solana.
• Gas on these Solana steps is paid by fomo’s fee payer, AgmLJBMDCqWynYnQiPCuj9ewsNNsBJXyzoUhD9LJzN51, which signs every user-initiated transaction.
• Fees on EVM chains are read from dune.tryfomo.fomo_relay_fees_by_chain, a table in fomo’s own Dune namespace, split into platform fees and referral fees by Relay network id: Base 8453, BNB Chain 56, Monad 143, Ethereum 1, Robinhood Chain 4663, Arc 5042. Fees fomo cannot attribute to a chain are counted on Solana.

A separate DefiLlama adapter, for fomo’s active users, also names a “Mobula bridge solver” (oMcssxWxgooErb8bsRA4QN34VHhvfeEbdDjrwF6WH45). Whether fomo routes through any provider other than Relay today is not documented.

None of this is in fomo’s own documents, and the EVM fee figures are data fomo supplies rather than numbers derived independently from the chain. We report it because it is public and it explains the numbers.

Why it matters when you read fomo’s numbers

Because your money sits on Solana and EVM trades are filled from there, DefiLlama books all spot volume on Solana, while EVM fees land on the chain each trade settled on. Divide Solana’s fees by total volume and you get a rate far below what traders pay; divide all fees by all volume and you get the real figure, which is what the realized fee rate does.

It also explains the referral data. DefiLlama’s referral (“supply-side”) line only covers the Relay side: about 15% of EVM fees went to referrers in the 30 days to November 8, 2026. Solana referral shares are paid inside the trade and never show up there.

For a trader, the practical points are simpler: fomo charges no separate bridge fee, the network fee on the destination chain is yours, and a sell can fail when no route is available at that moment.