# RFS Stablecoin Yield Risk Index (SYRI)

> A 0–100 risk score and band (Conservative / Moderate / Speculative) for stablecoin yield venues, sold per call to software agents. Payment is USDC on Base via the x402 protocol — no account, no API key, no signup.

RFS Consulting is an institutional risk advisory. SYRI is its stablecoin yield risk index, published here as a machine-payable endpoint so agents can check a venue's risk before routing capital into it.

## When to call this

Before parking or routing stablecoins into a lending pool, an RWA product, or a yield venue — and to re-check a venue already held. The score answers "how risky is this place to hold stablecoins?", not "what is the yield?".

## How to call it

1. `GET https://syri.rfsrisk.ai/api/score?entity=<slug>`
2. Receive `HTTP 402`. The terms are in the `Payment-Required` response header as base64 JSON, not in
   the body (x402 **v2**, scheme `exact`, network `eip155:8453` (Base), asset USDC, $0.10)
3. Pay and retry with the `X-PAYMENT` header — most x402 client libraries do this automatically
4. Receive the score as JSON

Entities outside the catalog return `404` and are never charged.

## Coverage

Six stablecoin yield venues: USDC on Aave V3, USDC on Morpho (Steakhouse), Ondo OUSG, Ethena sUSDe, Sky sDAI, Reserve eUSD.

## Data provenance

APY and TVL are measured and refreshed twice daily — DeFiLlama pool data, or on-chain `totalSupply` for $1-pegged tokens. The composite score and risk band are RFS analyst judgement, revised on review rather than on a schedule. Every response carries `as_of`, a methodology version, a disclaimer and a usage licence.

## Docs

- [Catalog](https://syri.rfsrisk.ai/api/catalog): the sellable venues, pricing, payment terms, response schema and data freshness. Free, no payment.
- [OpenAPI specification](https://syri.rfsrisk.ai/openapi.json): full machine-readable API description.
- [x402 discovery](https://syri.rfsrisk.ai/.well-known/x402.json): payment and service metadata.
- [Landing page](https://syri.rfsrisk.ai/): human-readable overview.
- [RFS Risk platform](https://rfsrisk.ai): the wider risk intelligence platform.
- [RFS Consulting](https://rfsconsultingglobal.com): the advisory practice behind the index.

## Notes

Risk analytics, not investment advice. Single-call, internal-use licence; redistribution or bulk reconstruction of the scored universe is prohibited.