Sandbox Testing

Test the full ramp lifecycle in sandbox without moving real money or crypto. Sandbox uses the same API endpoints and SDK methods as production — the only sandbox-specific calls are simulate-* endpoints that trigger transaction lifecycle progression.

What’s Real vs. Simulated

Operation	Sandbox Behavior
KYB start	Real KYB customer created in sandbox
KYB approve/reject	Simulated — instant approval or rejection
Create on-ramp account	Real provisioning — returns real-looking bank details
Create off-ramp account	Real provisioning — returns real crypto deposit address
Create recipient	Real provisioning — returns real recipient ID
Simulate transaction	Simulated locally — creates DB record, progresses statuses, fires webhooks
List/get transactions	Real queries against sandbox DB
Webhook delivery	Real webhooks to your configured URL
Actual bank transfer	Does not happen
Actual crypto transfer	Does not happen

Prerequisites

Sandbox API key (rfk_sandbox_*) — see Sandbox Environment
Webhook endpoint configured in dashboard (or use webhook.site for testing)

Step 1: KYB Approval

Start KYB for your organization, then instantly approve it using the simulation endpoint.

# Start KYB
curl -X POST "https://sandbox-api.rebelfi.io/v1/ramp/org/kyb/start" \
  -H "x-api-key: rfk_sandbox_xxxxxxxxxxxxx"

# Simulate approval (sandbox only)
curl -X POST "https://sandbox-api.rebelfi.io/v1/ramp/org/kyb/simulate-approve" \
  -H "x-api-key: rfk_sandbox_xxxxxxxxxxxxx"

You can also simulate a KYB rejection:

curl -X POST "https://sandbox-api.rebelfi.io/v1/ramp/org/kyb/simulate-reject" \
  -H "x-api-key: rfk_sandbox_xxxxxxxxxxxxx"

Step 2: Create Ramp Accounts

After KYB approval, create on-ramp and off-ramp accounts. These are provisioned through the sandbox banking infrastructure and return real-looking account details.

# On-ramp account (USD → USDC)
curl -X POST "https://sandbox-api.rebelfi.io/v1/ramp/org/onramp-accounts" \
  -H "x-api-key: rfk_sandbox_xxxxxxxxxxxxx" \
  -H "Content-Type: application/json" \
  -d '{"destinationAsset": "USDC", "orgWalletId": 1}'

# Off-ramp account (USDC → USD)
curl -X POST "https://sandbox-api.rebelfi.io/v1/ramp/org/offramp-accounts" \
  -H "x-api-key: rfk_sandbox_xxxxxxxxxxxxx" \
  -H "Content-Type: application/json" \
  -d '{
    "org_wallet_id": 1,
    "source_asset": "USDC",
    "rail": "ach",
    "bank_details": {
      "routing_number": "021000021",
      "account_number": "987654321",
      "account_type": "checking",
      "account_holder_name": "Acme Corp",
      "bank_name": "Chase Bank"
    }
  }'

Step 3: Simulate Transactions

Trigger transaction lifecycle simulation with a chosen scenario. The API responds immediately — the transaction progresses through statuses asynchronously in the background (~1.5s per step).

On-Ramp Simulation

curl -X POST "https://sandbox-api.rebelfi.io/v1/ramp/org/simulate-transaction" \
  -H "x-api-key: rfk_sandbox_xxxxxxxxxxxxx" \
  -H "Content-Type: application/json" \
  -d '{"scenario": "success", "usd_amount": 10000}'

Response:

{
  "success": true,
  "data": {
    "simulation_id": "sim_a1b2c3d4e5f6",
    "state": "accepted"
  }
}

Off-Ramp Simulation

curl -X POST "https://sandbox-api.rebelfi.io/v1/ramp/org/simulate-offramp-transaction" \
  -H "x-api-key: rfk_sandbox_xxxxxxxxxxxxx" \
  -H "Content-Type: application/json" \
  -d '{"scenario": "success", "usd_amount": 25000}'

Simulation Scenarios

Choose a scenario to control which lifecycle path the transaction follows.

On-Ramp Scenarios

Scenario	Status Progression	Webhook
`success`	pending → processing → in_progress → awaiting_confirmation → broadcasted → completed	`transaction.completed`
`failed`	pending → processing → failed	`transaction.failed`
`rejected`	pending → rejected	`transaction.failed`
`reversed`	pending → … → completed → reversed	`transaction.completed` then `transaction.failed`

Off-Ramp Scenarios

Scenario	Status Progression	Webhook
`success`	pending → processing → in_progress → awaiting_confirmation → broadcasted → completed	`offramp_transaction.completed`
`failed`	pending → processing → failed	`offramp_transaction.failed`

Each status transition takes ~1.5 seconds. A full success scenario completes in ~7.5 seconds. The reversed scenario takes ~10.5 seconds.

Request Parameters

On-ramp simulation:

Field	Type	Default	Description
`scenario`	`"success"` \| `"failed"` \| `"rejected"` \| `"reversed"`	`"success"`	Lifecycle path to simulate
`usd_amount`	number	`50000`	USD amount for the transaction
`onramp_account_id`	number	first account	Target a specific on-ramp account

Off-ramp simulation:

Field	Type	Default	Description
`scenario`	`"success"` \| `"failed"`	`"success"`	Lifecycle path to simulate
`usd_amount`	number	`50000`	USD amount for the transaction
`offramp_account_id`	number	first account	Target a specific off-ramp account

Step 4: Verify via Webhooks or Polling

When a simulated transaction reaches a terminal state, RebelFi fires the same webhook events as production to your configured endpoint.

# Poll transaction status
curl "https://sandbox-api.rebelfi.io/v1/ramp/org/transactions" \
  -H "x-api-key: rfk_sandbox_xxxxxxxxxxxxx"

Use webhook.site to quickly stand up a test endpoint and inspect incoming webhook payloads.

See Webhooks for the full event reference. The reversed scenario fires transaction.completed first, then transaction.failed with error "reversed".

Fee Calculation

Simulated transactions use fixed fee rates:

Component	Rate
Developer fee	5 bps
Platform fee	15 bps
Total fee	20 bps

Example — $10,000 transaction:

	Amount
Amount in	$10,000.00
Total fee	$20.00
Delivered	$9,980.00

Recipient-Level Simulation

You can also simulate transactions at the recipient level:

# Simulate on-ramp for a specific recipient
curl -X POST "https://sandbox-api.rebelfi.io/v1/ramp/recipients/1/simulate-transaction" \
  -H "x-api-key: rfk_sandbox_xxxxxxxxxxxxx" \
  -H "Content-Type: application/json" \
  -d '{"scenario": "success", "usd_amount": 10000}'

# Simulate off-ramp for a specific recipient
curl -X POST "https://sandbox-api.rebelfi.io/v1/ramp/recipients/1/simulate-offramp-transaction" \
  -H "x-api-key: rfk_sandbox_xxxxxxxxxxxxx" \
  -H "Content-Type: application/json" \
  -d '{"scenario": "success", "usd_amount": 25000}'

Simulation Endpoints Reference

Org-Level

Method	Path	Purpose
POST	`/v1/ramp/org/kyb/simulate-approve`	Approve KYB instantly
POST	`/v1/ramp/org/kyb/simulate-reject`	Reject KYB instantly
POST	`/v1/ramp/org/simulate-transaction`	Simulate on-ramp transaction
POST	`/v1/ramp/org/simulate-offramp-transaction`	Simulate off-ramp transaction

Recipient-Level

Method	Path	Purpose
POST	`/v1/ramp/recipients/{id}/simulate-transaction`	Simulate on-ramp for recipient
POST	`/v1/ramp/recipients/{id}/simulate-offramp-transaction`	Simulate off-ramp for recipient

Simulation endpoints are only available in the sandbox environment. Calling them in production returns a 400 error.

Testing Checklist

Use this checklist to validate your integration covers all scenarios:

KYB Flow

Start KYB and receive KYB URL
Simulate KYB approval and verify customer.approved webhook
Simulate KYB rejection and verify customer.declined webhook
Verify your app handles both approval and rejection gracefully

On-Ramp

Create on-ramp account and store bank details
Simulate success scenario — verify transaction.completed webhook and amounts
Simulate failed scenario — verify transaction.failed webhook and error handling
Simulate rejected scenario — verify your app handles rejections
Simulate reversed scenario — verify your app handles both completed and reversed events
Verify transaction appears in transaction list

Off-Ramp

Create off-ramp account with bank details
Simulate success scenario — verify offramp_transaction.completed webhook
Simulate failed scenario — verify offramp_transaction.failed webhook
Verify transaction appears in off-ramp transaction list

Edge Cases

Call simulate endpoints before KYB approval — verify 400 error
Attempt to simulate with an invalid recipient ID — verify 404 error
Verify fee math matches expected values for your transaction amounts

Next Steps

Webhooks

Full webhook event reference

Quick Start

Production integration guide

Quick Start Webhooks

Overview

Getting Started

API Reference

Sandbox Testing

What’s Real vs. Simulated

Prerequisites

Step 1: KYB Approval

Step 2: Create Ramp Accounts

Step 3: Simulate Transactions

On-Ramp Simulation

Off-Ramp Simulation

Simulation Scenarios

On-Ramp Scenarios

Off-Ramp Scenarios

Request Parameters

Step 4: Verify via Webhooks or Polling

Fee Calculation

Recipient-Level Simulation

Simulation Endpoints Reference

Org-Level

Recipient-Level

Testing Checklist

Next Steps

Webhooks

Quick Start

Overview

Getting Started

API Reference

​What’s Real vs. Simulated

​Prerequisites

​Step 1: KYB Approval

​Step 2: Create Ramp Accounts

​Step 3: Simulate Transactions

​On-Ramp Simulation

​Off-Ramp Simulation

​Simulation Scenarios

​On-Ramp Scenarios

​Off-Ramp Scenarios

​Request Parameters

​Step 4: Verify via Webhooks or Polling

​Fee Calculation

​Recipient-Level Simulation

​Simulation Endpoints Reference

​Org-Level

​Recipient-Level

​Testing Checklist

​Next Steps

Webhooks

Quick Start

What’s Real vs. Simulated

Prerequisites

Step 1: KYB Approval

Step 2: Create Ramp Accounts

Step 3: Simulate Transactions

On-Ramp Simulation

Off-Ramp Simulation

Simulation Scenarios

On-Ramp Scenarios

Off-Ramp Scenarios

Request Parameters

Step 4: Verify via Webhooks or Polling

Fee Calculation

Recipient-Level Simulation

Simulation Endpoints Reference

Org-Level

Recipient-Level

Testing Checklist

Next Steps