> For the complete documentation index, see [llms.txt](https://docs.fonbnk.com/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.fonbnk.com/server-to-server/api-endpoints/get-order-limits.md).
# Get order limits
## \[GET] /api/v2/order-limits
Returns the min and max order amount for one deposit/payout pair, in both the leg's own currency and USD.
Request query params type:
```typescript
type QueryParams = {
depositPaymentChannel: PaymentChannel,// required
depositCurrencyType: CurrencyType,// required
depositCurrencyCode: string,// required
depositCarrierCode?: string,// optional
depositCountryIsoCode?: string,// required if depositCurrencyType is fiat
payoutPaymentChannel: PaymentChannel,// required
payoutCurrencyType: CurrencyType,// required
payoutCurrencyCode: string,// required
payoutCarrierCode?: string,// optional
payoutCountryIsoCode?: string// required if payoutCurrencyType is fiat
}
```
Request URL example:
{% code overflow="wrap" %}
```
GET /api/v2/order-limits?depositPaymentChannel=bank&depositCurrencyType=fiat&depositCurrencyCode=NGN&depositCountryIsoCode=NG&payoutPaymentChannel=crypto&payoutCurrencyType=crypto&payoutCurrencyCode=CELO_USDT
```
{% endcode %}
Response type:
{% code overflow="wrap" expandable="true" %}
```typescript
type Response = {
deposit: {
min: number; // in the deposit currency
max: number;
minUsd: number;
maxUsd: number;
step: number; // increment the amount must be a multiple of
supportsDecimals: boolean;// false means whole units only
},
payout: {
min: number;
max: number;
minUsd: number;
maxUsd: number;
step: number;
supportsDecimals: boolean;
},
supported: boolean; // false means no offer serves this corridor
unsupportedReason?: { // present only when supported is false
errorCode: string;
message: string;
details: { leg: 'deposit' | 'payout'; field: string };
},
}
```
{% endcode %}
Use `step` and `supportsDecimals` to drive your amount input. A fiat leg is usually whole units with `step: 1`; a crypto leg usually allows decimals. Rounding an amount the wrong way is the most common cause of a rejected Create quote.
Response example:
```json
{
"deposit": {
"min": 1494,
"max": 747367,
"minUsd": 1,
"maxUsd": 500,
"step": 1,
"supportsDecimals": false
},
"payout": {
"min": 1,
"max": 500,
"minUsd": 1,
"maxUsd": 500,
"step": 0.000001,
"supportsDecimals": true
},
"supported": true
}
```
### When the corridor is not served
This endpoint always answers `200`. A corridor no offer serves comes back with every limit set to `0`, `supported: false`, and an `unsupportedReason` that says which field has nothing behind it. `unsupportedReason.errorCode` and `unsupportedReason.details` are the same values, in the same shape, that a `404` from Create quote would carry — see Errors.
```json
{
"deposit": { "min": 0, "max": 0, "minUsd": 0, "maxUsd": 0, "step": 0, "supportsDecimals": false },
"payout": { "min": 0, "max": 0, "minUsd": 0, "maxUsd": 0, "step": 0, "supportsDecimals": false },
"supported": false,
"unsupportedReason": {
"errorCode": "COUNTRY_NOT_SUPPORTED",
"message": "Fonbnk does not support this deposit country for this currency. Supported countries: KE, NG. Call GET /api/v2/currencies for the currencies, countries, payment channels and carriers Fonbnk supports.",
"details": { "leg": "deposit", "field": "deposit.countryIsoCode" }
}
}
```
{% hint style="danger" %}
**Check `supported` before you read a limit.** The channel and currency-type params are not enum-validated, so a typo, an unsupported pair, and a pair whose providers are all currently unavailable all come back as `200` with zeros. Never show `0` to a user as a limit. `unsupportedReason.errorCode` tells you whether to fix the request or to retry later — the codes are listed on Errors.
{% endhint %}
{% hint style="info" %}
`LIMITS_DO_NOT_OVERLAP` is the one code you will see here and nowhere else. It means both legs have routes and no single amount satisfies both, usually because of a per-transaction limit on your account. There is nothing further to read: this endpoint is the window, and it is these zeros.
{% endhint %}
### How the window is built
Start with the **widest** range any available provider supports — the lowest minimum and the highest maximum across all matching offers. That range is then narrowed twice: by the limit rules on your account, and by reconciling the two legs against each other so both are satisfiable.
So the number you get is not any single provider's range, and it moves with exchange rates, with provider availability, and with your own limits. Read it again each time the user opens your amount screen rather than caching it.
---
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