# UPI Payin (INR → USDT) | H2H

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This section provides a reference for integrating Tylt CrossRamp’s UPI on-ramp flow via a host-to-host (H2H) integration. Through this integration, merchants can directly orchestrate on-ramp flows using API calls, without relying on the hosted widget. End-user INR transfers are facilitated through a peer-to-peer (P2P) network of liquidity providers, enabling the acquisition of stablecoins which are subsequently transferred to the merchant.

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#### Flow Overview

* Merchant initiates on-ramp instances via API
* End users complete UPI transfers through P2P-matched counterparties
* Fiat leg is executed via the P2P network of liquidity providers
* Upon confirmation, crypto-asset conversion is executed
* Resulting USDT is transferred to the merchant

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#### What You’ll Find in the API Reference

**1. UPI On-Ramp Flow (INR → USDT)**\
Guidance for initiating and managing on-ramp flows via API, including lifecycle tracking and reconciliation.

**2. Supporting APIs**\
Documentation for auxiliary endpoints, including supported currencies, networks, and system capabilities.

**3. Endpoint Descriptions**\
Detailed specifications for all API endpoints, including parameters, authentication requirements, and integration patterns.

**4. Request & Response Formats**\
Structured JSON examples covering on-ramp creation, status tracking, webhook payloads, and error handling.

**5. Code Examples**\
Reference implementations in Node.js, Python, and other commonly used stacks.

**6. Error Handling**\
Common error scenarios, causes, and recommended handling strategies.

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#### Summary

This API enables merchants to integrate UPI-based on-ramp functionality via direct API communication, allowing end users to acquire stablecoins through P2P-facilitated fiat flows, with settlement managed in USDT through Tylt’s crypto-asset infrastructure


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