diff --git a/README.md b/README.md
index 5610f15..3c080b8 100644
--- a/README.md
+++ b/README.md
@@ -38,6 +38,7 @@ x402 is an emerging open standard from the Coinbase ecosystem focused on safer,
 - [Strale](https://strale.dev) - Business data & compliance APIs for AI agents. 250+ quality-scored capabilities (company data, VAT validation, sanctions screening, KYB) across 27 countries with x402 payment support. [MCP server](https://www.npmjs.com/package/strale-mcp) available.
 - [Hedera and the x402 Payment Standard](https://hedera.com/blog/hedera-and-the-x402-payment-standard/) - Hedera ecosystem overview of x402-style programmable payments for applications and AI agents.
 - [CardZero](https://cardzero.ai) - Smart-contract wallet (ERC-4337) for AI agents on Base mainnet, USDC. Buyer-side x402 support via `POST /v1/x402/pay`. Owner-controlled spending rules (per-tx limit, daily cap, whitelist, freeze) enforced on-chain. Also runs first known production deployment of ERC-8004 + ERC-8183.
+- [QuantOracle](https://api.quantoracle.dev) - 73 deterministic quant finance endpoints for AI agents — Black-Scholes pricing with Greeks, Kelly Criterion, Monte Carlo, Sharpe/Sortino/Calmar/VaR/CVaR, Hurst exponent, GARCH, plus 10 paid composites (risk audit, hedge recommendation, options strategy optimizer). Math verified against 120 textbook benchmarks (Hull, Lopez de Prado, Kelly, Parkinson). Multi-chain (Base + Solana) via Coinbase CDP facilitator, $0.002–$0.10 USDC/call. Free tier 1,000 calls/IP/day, no signup. AgentKit action provider + LangChain toolkit (`langchain-quantoracle`) + MCP HTTP server. ([OpenAPI](https://api.quantoracle.dev/openapi.json)) ([x402 Discovery](https://api.quantoracle.dev/.well-known/x402)) ([Calculators](https://quantoracle.dev)) ([GitHub](https://github.com/QuantOracledev/quantoracle))
 
 ### Facilitators & Networks
 - [Coinbase Hosted Facilitator (Base)](https://docs.cdp.coinbase.com/x402#offload-your-infra)