# Util

Utility

## Check address

> Check if the provided wallet address was used in the Fonbnk system

```json
{"openapi":"3.1.0","info":{"title":"Fonbnk On-ramp API","version":"1.0.0"},"tags":[{"name":"util","description":"Utility"}],"servers":[{"url":"https://sandbox-api.fonbnk.com","description":"Development server"},{"url":"https://aten.fonbnk-services.com","description":"Production server"}],"security":[{"ClientIdHeader":[]},{"TimestampHeader":[]},{"SignatureHeader":[]}],"components":{"securitySchemes":{"ClientIdHeader":{"type":"apiKey","in":"header","name":"x-client-id"},"TimestampHeader":{"type":"apiKey","in":"header","name":"x-timestamp"},"SignatureHeader":{"type":"apiKey","in":"header","name":"x-signature"}}},"paths":{"/api/util/check-address":{"post":{"tags":["util"],"summary":"Check address","description":"Check if the provided wallet address was used in the Fonbnk system","operationId":"checkAddress","requestBody":{"required":true,"content":{"application/json":{"schema":{"type":"object","properties":{"address":{"type":"string"}}}}}},"responses":{"200":{"description":"Address usage status","content":{"application/json":{"schema":{"type":"object","properties":{"used":{"type":"boolean"}}}}}}}}}}}
```

## Get supported blockchain assets

> Returns a list of supported blockchain assets for the off-ramp and on-ramp

```json
{"openapi":"3.1.0","info":{"title":"Fonbnk On-ramp API","version":"1.0.0"},"tags":[{"name":"util","description":"Utility"}],"servers":[{"url":"https://sandbox-api.fonbnk.com","description":"Development server"},{"url":"https://aten.fonbnk-services.com","description":"Production server"}],"security":[{"ClientIdHeader":[]},{"TimestampHeader":[]},{"SignatureHeader":[]}],"components":{"securitySchemes":{"ClientIdHeader":{"type":"apiKey","in":"header","name":"x-client-id"},"TimestampHeader":{"type":"apiKey","in":"header","name":"x-timestamp"},"SignatureHeader":{"type":"apiKey","in":"header","name":"x-signature"}},"schemas":{"OnrampNetwork":{"type":"string","enum":["POLYGON","ETHEREUM","STELLAR","AVALANCHE","SOLANA","ALGORAND","CELO","BASE","TON","LISK","ARBITRUM","OPTIMISM","BNB"]},"OnrampAsset":{"type":"string","enum":["USDC","USDC_E","USDT","CUSD","CKES"]}}},"paths":{"/api/util/assets":{"get":{"tags":["util"],"summary":"Get supported blockchain assets","description":"Returns a list of supported blockchain assets for the off-ramp and on-ramp","operationId":"blockchainAssets","responses":{"200":{"description":"Successful response","content":{"application/json":{"schema":{"type":"array","items":{"type":"object","properties":{"network":{"$ref":"#/components/schemas/OnrampNetwork"},"asset":{"$ref":"#/components/schemas/OnrampAsset"},"canOnramp":{"type":"boolean"},"canOfframp":{"type":"boolean"}}}}}}}}}}}}
```


---

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```
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```

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Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.