Send mobile credit to Mexico with crypto

The US-to-Mexico remittance corridor is the biggest in the world — over $60 billion a year flows across the border, most of it from undocumented or semi-documented workers to their families back home. Western Union, MoneyGram and Remitly all dominate it, and all three take their cut. FillUpCoin lets a worker in Dallas or Los Angeles top up a Telcel Amigo plan in Michoacán in two minutes, with crypto, with no bank account, no ID photo and no $8 fee. The ₱ balance appears on the number in less time than it takes to count out cash at a bodega.

The cost comparison nobody talks about

Figures are typical. Western Union and Remitly fees vary by corridor, payment method, and promotional pricing. FillUpCoin only charges the crypto network fee — $0.50 on USDT TRC-20, pennies on Solana, $1-5 on Bitcoin depending on mempool.

Why send airtime instead of cash to Mexico

• Telcel Amigo is the dominant prepaid plan in Mexico. Over 80% of Mexican subscribers use it. A direct top-up to a Telcel number means the family in Mexico has data for the week — WhatsApp, Facebook, mobile banking, their kid's homework on Google Classroom.
• Cross-border crypto doesn't ask about immigration status. US workers without papers can't open a bank account to use Remitly — but they can use a crypto wallet.
• Fees stay low. Western Union charges $5-8 for a $100 transfer plus a FX markup around 3-5%. Our effective cost is the crypto network fee: cents to a dollar.
• Delivery is immediate, not 'business days'. Family in rural Oaxaca doesn't need to walk to a Western Union pickup kiosk 20km away.
• AT&T Mexico and Movistar prepaid work the same way for subscribers who don't use Telcel.

The best crypto for Mexico top-ups

USDT on TRC-20 for a $25-75 top-up, Bitcoin for larger amounts and if the sender already holds BTC.

You can also pay in Bitcoin (BTC on-chain), Ethereum (ETH), or Solana (SOL). The invoice is denominated in euros, so the sender sees the exact amount in crypto before confirming — no surprise exchange-rate movements.

How it looks from the sender's side

In many Mexican-American households, the parent who crossed the border 20 years ago still sends a Telcel top-up to grandma in Hidalgo every two weeks. For most of that period it meant walking to a Western Union, filling out paperwork, giving away ID and losing $10-15 on each transfer. The arrival of crypto-airtime services broke that pattern. You can do it from your phone during a work break.

Common senders include United States, Canada and Spain — anywhere there's a Mexico diaspora with internet access, our service works. The only requirement on the sender side is a crypto wallet with a positive balance.

Step by step: send credit to Mexico with crypto

1. Open the Mexico refill page and pick the carrier your family uses — Telcel, AT&T Mexico, Movistar.
2. Enter the full Mexico mobile number including the country dial code. The site auto-formats it as you type.
3. Pick an amount from €15 to €200. The equivalent in local currency is shown live so you know exactly what the recipient will see.
4. Add an email — this is where the receipt and (if applicable) the voucher PIN land.
5. Pay the crypto invoice. We quote and lock the amount for 20 minutes. BTC, USDT (TRC-20 or ERC-20), ETH, or SOL — pick whichever has the lowest network fee at that moment.
6. The carrier processes the top-up as soon as the payment confirms on-chain. Your family in Mexico sees the balance credit by SMS from the carrier within a minute of confirmation.