Rates, Pricing and Fees

Every pair is quoted against USDC, both ways. The table reads GET /levels from the staging gateway once a minute; it is the same data your integration gets. 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 Supported Ticket Sizes.

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. If a fee is ever introduced it appears in these fields first.
Gas	You, on Base	A fill uses about 120k gas: a fraction of a cent on Base.

There is no subscription, no minimum volume, no charge for quotes you do not fill, and no fee on /config, /levels or /orders. 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 (EUR, GBP, CAD, SGD) the interbank rate is the market, and the rate comes from a public Chainlink FX feed on Base. Where the dollar stablecoin trades at a premium or discount in the local market (IDR, TRY) the interbank rate is not a price anyone can trade at on chain, so the rate is read from the local stablecoin market. 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
Checks	Tokocrypto USDT/IDR must agree with Indodax within 75 bps and Binance USDC/USDT with the Base pool within 10 bps, else the rate halts and the pair answers `no-price` instead of a bad quote
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	Chainlink GBP/USD feed on Base, `0xCceA…Fa15`
Updates	A new round when the rate moves 0.5 % or after 24 hours; flat over the weekend
Why this rate	tGBP trades a few bps around sterling on Coinbase and Kraken

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
Checks	BtcTurk USDT/TRY must agree with Binance within 50 bps, Binance USDC/USDT with the Base pool within 10 bps
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

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, Pricing and Fees

What you pay

Midmarket rates

EURC

XSGD

IDRX

TGBP

TRYB

CADC

Reading it from the API

​What you pay

​Midmarket rates

​EURC

​XSGD

​IDRX

​TGBP

​TRYB

​CADC

​Reading it from the API

What you pay

Midmarket rates

EURC

XSGD

IDRX

TGBP

TRYB

CADC

Reading it from the API