Rates & fees

Midmarket is the mid rate the maker prices from, in USD per coin; Spread is the distance of the firm quote’s price from it, in basis points, for buying the coin with USDC and for selling it. Sizes are on Trade sizes and limits.

What you pay

Cost	Who takes it	How much
Spread	The market maker that signed the quote	Inside the rate. `buyAmount / sellAmount` is the all-in price; its distance from `referenceRate` is the spread in the table above.
Protocol fee	Aile	None today. `fees.bps` and `fees.amount` in every quote read `0`; `fees.recipient` is the zero address.
Gas	You, on Base	A fill uses about 120k gas: a fraction of a cent on Base.

There is no subscription, no minimum volume and no charge for quotes you do not fill. Because a quote is a signed order, the rate you see is the rate you get: no re-pricing between the quote and the fill, no slippage tolerance to set. The quote carries referenceRate (the midmarket rate it was priced from) and sellAmount/buyAmount (the exact amounts), so the spread of every quote can be checked.

Midmarket rates

The midmarket rate is the one the maker actually prices from. It is not the same source for every currency: where a coin trades at par with its fiat and the live markets for it are not yet wired in (EUR, CAD, SGD) the rate comes from a public Chainlink FX feed on Base. Where order books trade the coin or its currency around the clock (GBP), or where the dollar stablecoin trades at a premium or discount in the local market (IDR, TRY) so that the interbank rate is not a price anyone can trade at on chain, the rate is read from those markets. reference.source on each level says which: chainlink or api.

EURC


Midmarket rate	Chainlink EUR/USD feed on Base, `0xc91D…3F0F`
Updates	A new round when the rate moves 0.1 % or after 1 hour, during FX market hours; flat at the Friday close over the weekend
Why this rate	EURC trades at par with the euro: Coinbase EURC-USDC and the Base pools sit within a few bps of the interbank rate

XSGD


Midmarket rate	Chainlink SGD/USD feed on Base, `0x8157…949b`
Updates	A new round when the rate moves 0.5 % or after 24 hours — in practice one print a day; flat over the weekend
Why this rate	XSGD trades at par with the Singapore dollar. The feed’s daily cadence means the Base pool can sit up to ~25 bps away intraday

IDRX


Midmarket rate	Local market: the Indodax USDT/IDR order book (mid at 10,000 USDT depth) converted to USDC at the Base USDC/USDT rate (Uniswap v3, 2,500 USDC)
Updates	Every few seconds, 24/7
Why this rate	In Indonesia the dollar stablecoin trades 10–30 bps below the interbank rate most days. This is the price at which rupiah actually becomes a dollar stablecoin on chain. Priced from the local market since 9 November 2026

TGBP


Midmarket rate	Market: the median of three order books — Coinbase TGBP-USDC, Kraken TGBP/USD and Kraken GBP/USD (mid at 7,500 depth each)
Updates	Every few seconds, 24/7. The Chainlink GBP/USD feed on Base, `0xCceA…Fa15`, stays as a sanity bound on every quote
Why this rate	tGBP trades within a few bps of sterling on Coinbase and Kraken, and those books trade through the weekend while the daily feed holds Friday’s print. Priced from the market since 9 November 2026

TRYB


Midmarket rate	Local market: the Binance USDT/TRY order book (mid at 10,000 USDT depth) converted to USDC at the Base USDC/USDT rate
Updates	Every few seconds; paused Friday 21:00 to Sunday 21:00 UTC (the FX weekend), when the pair is not quoted
Why this rate	The lira’s dollar-stablecoin market moves with local demand for dollars, not only with the interbank fix. Priced from the local market since 9 November 2026

CADC


Midmarket rate	Chainlink CAD/USD feed on Base, `0xA840…5D5d`
Updates	A new round when the rate moves 0.1 % or after 1 hour, during FX market hours
Why this rate	CADC trades at par with the Canadian dollar

WBRL


Midmarket rate	Chainlink BRL/USD feed on Base, `0x0b0E…9394`
Updates	A new round when the rate moves 0.1 % or after 1 hour, including weekends
Why this rate	wBRL (Ripio) trades at par with the real. The local dollar-stablecoin market (Binance USDT/BRL) is recorded in parallel and becomes the rate once its shadow run is complete

WMXN


Midmarket rate	Chainlink MXN/USD feed on Base, `0x9e8E…00bd`
Updates	A new round when the rate moves 0.1 % or after 1 hour, including weekends
Why this rate	wMXN (Ripio) trades at par with the peso; the local market (Binance USDT/MXN) is recorded in parallel

WARS


Midmarket rate	Chainlink ARS/USD feed on Base, `0xaf99…8cE3`
Updates	A new round when the rate moves 0.5 % or after 24 hours — in practice one print a day
Why this rate	The feed tracks the market (not the official) peso rate, 25–40 bps off the Binance USDT/ARS book on a typical day. The local market is recorded in parallel and becomes the rate once its shadow run is complete

Reading it from the API

curl -s https://staging.app.aile.tech/api/base/v1/levels | jq '.levels[] | {sellToken, buyToken, reference, maxFirmSize}'

reference.rate is the midmarket rate, reference.source its kind (chainlink or api), reference.at its time. No key is needed; the machine-readable form is documented at GET /v1/levels.

Introduction

Integrate

API reference

Reference

Legal & access

Rates & fees

What you pay

Midmarket rates

EURC

XSGD

IDRX

TGBP

TRYB

CADC

WBRL

WMXN

WARS

Reading it from the API

​What you pay

​Midmarket rates

​EURC

​XSGD

​IDRX

​TGBP

​TRYB

​CADC

​WBRL

​WMXN

​WARS

​Reading it from the API

What you pay

Midmarket rates

EURC

XSGD

IDRX

TGBP

TRYB

CADC

WBRL

WMXN

WARS

Reading it from the API