Introduction
Stablecoin Harness is the StablecoinX developer platform for stablecoin-native applications. One API handles payments, gas sponsorship, cross-chain settlement, and a yield-aware treasury. An MCP surface exposes the same operations to AI agents.
What you can build
Section titled “What you can build”- Accept stablecoin payments with deterministic deposit addresses and signed webhook delivery.
- Sponsor gas via ERC-4337 paymasters — fully, partially, or per-policy.
- Let users pay gas in stablecoins instead of the chain’s native asset.
- Onboard merchants with email-OTP, SIWE, and scoped API keys.
- Settle cross-chain via LayerZero V2 with vault-composed deposits.
- Operate a treasury across wallets, chains, and yield protocols.
- Expose your stack to agents through a typed MCP tool catalog.
How these docs are organized
Section titled “How these docs are organized”- Get started — concepts, prerequisites, your first integration.
- Features — end-to-end walkthroughs for each product surface.
- API reference — endpoints, parameters, and response shapes.
- For agents —
llms.txt,llms-full.txt, and markdown twins for LLM-friendly consumption.
Status conventions
Section titled “Status conventions”- GA — stable, production-ready, semver-protected.
- Beta — production-usable; minor breaking changes possible before GA.
- Coming soon — committed roadmap. The endpoints and types documented here will not change once shipped.
Code samples default to curl and TypeScript. Other languages on request.
- Quickstart — first call in under ten minutes.
- Features — find the surface you need.
- Paymaster API — jump straight into the reference.