> For the complete documentation index, see [llms.txt](https://docs.ur.app/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.ur.app/api-reference/api/account/delegated-contract-mode/create-on-ramp-request.md).

# Create on-ramp request

Delegated Contract Mode will be deprecated soon; new partners should use Managed Custody Mode. On-ramp is not yet generally available; this endpoint is documented for preview only. Exchanges a fiat token to USDC and optionally performs a swap or bridge to the target token based on the quote from /v1/onramp/quote. Omit the dst\* fields to perform fiat to USDC only.

```json
{"openapi":"3.1.0","info":{"title":"UR API","version":"1.0.0"},"tags":[{"name":"Delegated Contract Mode","description":"Legacy partner APIs built on the Delegator Contract. Not recommended for new integrations."}],"servers":[{"url":"https://openapi.ur.app","description":"Production (partner API)"},{"url":"https://uropenapi-qa.ur-inc.xyz","description":"Testnet (partner API)"}],"security":[{"partnerAuth":[]},{"userWalletAuth":[]}],"components":{"securitySchemes":{"partnerAuth":{"type":"apiKey","in":"header","name":"X-Api-Signature","description":"Partner Auth: EIP-191 signature by the partner's registered backend key, with X-Api-Deadline and optional X-Api-PublicKey headers. See the Signature and verify guide."},"userWalletAuth":{"type":"apiKey","in":"header","name":"sign","description":"User wallet auth (External Wallet Access Mode): EIP-191 signature by the user's wallet key, with tokenId, network, hash, and deadline headers. See the Signature and verify guide."}},"schemas":{"DcEnvelope":{"type":"object","properties":{"code":{"type":"integer","description":"0 on success; non-zero indicates a business rejection.","format":"int64"},"message":{"type":"string","description":"Human-readable diagnostic; empty on success."},"data":{"description":"Business payload. Shape depends on the endpoint."}},"required":["code","message"],"description":"Standard response envelope for the partner API (openapi.ur.app)."}}},"paths":{"/v1/onramp":{"post":{"tags":["Delegated Contract Mode"],"operationId":"dcCreateOnramp","summary":"Create on-ramp request","description":"Delegated Contract Mode will be deprecated soon; new partners should use Managed Custody Mode. On-ramp is not yet generally available; this endpoint is documented for preview only. Exchanges a fiat token to USDC and optionally performs a swap or bridge to the target token based on the quote from /v1/onramp/quote. Omit the dst* fields to perform fiat to USDC only.","parameters":[{"name":"X-Api-Signature","in":"header","required":true,"schema":{"type":"string"},"description":"Partner's EIP-191 signature (0x-prefixed hex)."},{"name":"X-Api-Deadline","in":"header","required":true,"schema":{"type":"string"},"description":"Unix seconds when the request signature expires (within 5 minutes)."},{"name":"X-Api-PublicKey","in":"header","required":false,"schema":{"type":"string"},"description":"Partner's signer Ethereum address."}],"requestBody":{"required":true,"content":{"application/json":{"schema":{"type":"object","properties":{"quoteId":{"type":"string","description":"Quote ID from /v1/onramp/quote."},"requestId":{"type":"string","description":"Idempotency key; reuse on retry."},"urId":{"type":"integer","description":"UR user ID.","format":"int64"},"tokenIn":{"type":"string","description":"Fiat token symbol from /v1/tokens."},"amountIn":{"type":"string","description":"Input amount in smallest units. After conversion, must be at least 5 USDC."},"withdrawAddress":{"type":"string","description":"User-specified withdrawal address for the on-ramp."},"chainId":{"type":"string","description":"Source chain ID (currently Mantle only)."},"dstChainId":{"type":"string","description":"Destination chain ID for the bridge or swap."},"dstAggregator":{"type":"string","description":"Aggregator contract address from best.aggregator in the quote."},"dstTokenOut":{"type":"string","description":"Destination token symbol."},"dstSwapCalldata":{"type":"string","description":"best.swapCalldata from the quote."},"dstMinAmountOut":{"type":"string","description":"Minimum acceptable amount in smallest units, from best.minUsdcAmount."}},"required":["quoteId","requestId","urId","tokenIn","amountIn"]}}}},"responses":{"200":{"description":"Response envelope. For the user API, retCode 0 means success; for the partner API, code 0 means success. Business rejections return HTTP 200 with a non-zero code.","content":{"application/json":{"schema":{"$ref":"#/components/schemas/DcEnvelope"}}}}}}}}}
```


---

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