x402lab

XRPL AMM risk data, paid per call via x402. Minute-cadence pool snapshots, impermanent-loss/fee decomposition, and stale-bias-corrected volatility (Hansen–Lunde realized kernel) from a continuously collected XRP/RLUSD observation archive.

Product	Endpoint	Price per call
Pool snapshot series	`GET /v1/pool/snapshot`	0.01 XRP / 0.011 RLUSD
IL / fee decomposition	`GET /v1/pool/il`	0.05 XRP / 0.055 RLUSD
Corrected sigma-squared (HL kernel)	`GET /v1/pool/sigma`	0.09 XRP / 0.099 RLUSD

Payment: x402 v2 on the XRP Ledger (XRP or RLUSD) — request any endpoint, receive an HTTP 402 challenge, pay with a presigned XRPL Payment. No API keys, no signup.

Catalog (free JSON — prices & live data coverage)
x402 discovery manifest
Listed on XRPL AI Hub

Docs: start with the catalog; each endpoint returns parameter errors as JSON (422) with honest data-coverage fields in every paid response.