On-Off Ramp

Supported Stablecoins

Stablecoin	Network	Ramp type	Network fee*
CUSD / USDC / USDT	CELO	On-ramp & Off-ramp	$0.01
USDC	BSC	Onramp & Off-ramp	0.03
USDC	OP	On-ramp & Off-ramp	$0.03
USDC	BASE	On-ramp & Off-ramp	$0.03
USDC	MATIC	On-ramp & Off-ramp	$0.03

* Network fees are deducted from the customer’s payout.

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Getting Started

All you need is a public API key. Create one by following the authentication guide.

The ramp is delivered as a URL you build with query parameters.

Base URLs

Environment	URL
Staging	https://staging.useaccrue.com/hosted/ramp
Production	https://useaccrue.com/hosted/ramp

URL Parameters

Name	Required	Description
key	Yes	Your public API key.
paymentType	Yes	deposit or withdrawal.
address	No	Wallet to receive funds. If omitted, Cashramp tries window.ethereum.
coin	Yes	Stablecoin symbol (see table above).
network	Yes	Network name from the table.
amount	No	Quantity of the stablecoin.
reference	No	Your idempotent reference.
redirectUrl	No	Where to send the user after completion.
currency	No	ISO-4217 fiat code (e.g., USD).
phone	No	Customer’s phone number.
hideAddress	No	true to hide the wallet address field.
isWalletContext	No	Set false to ignore window.ethereum and use your own flow. Default true.

Example

https://useaccrue.com/hosted/ramp?key=CSHRMP-PUBK_mO86nN3ye84hIso&paymentType=deposit&coin=CUSD&network=CELO&amount=10&reference=test_reference

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Custom Crypto-Deposit Flow

When window.ethereum is present, Cashramp prompts the user to sign the transfer automatically. If it isn’t, we emit a postMessage so you can run your own UX:

window.addEventListener("message", (event) => {
  if (event.origin === "https://useaccrue.com") {
    const { event: name, payload } = event.data;
    if (name === "crypto.requested") {
      const amountUsd = Number(payload.amountCents) / 100;
      const destination = payload.destinationAddress;
      const paymentRequestId = payload.paymentRequest;

      /*
       * Launch your custom flow to send EXACTLY
       * `amountUsd` worth of stablecoins to `destination`.
       * After broadcasting, call confirmTransaction (below).
       */
    }
  }
});

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Confirm Transaction

After broadcasting the transfer, poll confirmTransaction until it settles. Poll in line with block times: CELO & Optimism ≈ 10 s; Ethereum ≈ 60 s.

mutation {
  confirmTransaction(
    paymentRequest: "VHlwZXM6OkNhc2hyYW1wOjpBUEk6Ok1lcmN6YW50UGF5bWVudFJlcXVlc3QtZjVkZDdhYWEtZDI1Yy00YTZmLTkwODMtNzk1NjdkOTNjNmM4"
    transactionHash: "0x4321897b3c4495a314d081dbcf2cb5310b19834bda124f5ad03e07464b1add73"
  )
}

Argument	Description
paymentRequest	Global ID from the earlier crypto.requested payload.
transactionHash	Hash of your on-chain transfer.

What Happens Next

• The payment request moves from pending_funding → created.

• A webhook fires with the updated status.

• Cashramp emails the user a link to withdraw the fiat equivalent.

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