derivatives-pricer-production.up.railway.app
DCi9X5mmacNGLeJvCw9fdWgX3G8V4QquDn4EuXATkcYr
derivatives-pricer-production.up.railway.app received $0.01 of x402 payments passing every screen (1% of $1.60 reported) from 1 of 2 buyer wallets on Solana in the 7 days to 2026-10-16.
Daily
| Date (UTC) | Payments | Reported | Real | Real / flagged |
|---|---|---|---|---|
| 2026-10-12 | 15 | $1.55 | $0.00 | |
| 2026-10-15 | 1 | $0.01 | $0.01 | |
| 2026-10-16 | 3 | $0.04 | $0.00 |
What the screens flagged
- Self-payment: 18 payments, $1.59. Self-payment: payer and payee are the same wallet.
- Buyer concentration: 18 payments, $1.59. Buyer concentration: one buyer accounts for 90% or more of the merchant's USD volume (only that buyer's payments are flagged).
Screens describe patterns in public on-chain data. A flag is not a finding of wrongdoing: a merchant testing its own endpoint, a single large customer or a high-volume integration can all trip them. A payment can trip more than one screen.
Prices
Median amount paid per payment: $0.03 (middle half $0.02–$0.15); passing payments only: $0.01. Median listed price: $0.10.
| Listed endpoint (Coinbase x402 Bazaar) | Listed price |
|---|---|
https://derivatives-pricer-production.up.railway.app/v1/option/priceWhen to use: you already have model inputs (S or forward mark, K, T, r, σ) and need fair value + hedge ratios — not market-premium IV. European BSM price + analytic Greeks (delta, gamma, vega, theta, rho). Works for equity spots and power/c | $0.01 |
https://derivatives-pricer-production.up.railway.app/v1/option/implied-volWhen to use: one market premium → need σ̂ + Greeks; cheaper/faster than a full surface. Solves Black-Scholes IV then prices Greeks at the solved σ. Same engine as the surface endpoint (fastImpliedVol). Prefer surface when you have a multi-s | $0.03 |
https://derivatives-pricer-production.up.railway.app/v1/option/price-from-surfaceWhen to use: you already have an IV surface (k,T,σ) and need to price options on it — not invert premiums and not scalar σ. Interpolates total variance w=σ²T bilinear in log-moneyness k=ln(K/F); wingRule=flat_vol. Returns price, interpolate | $0.08 |
https://derivatives-pricer-production.up.railway.app/v1/volatility/surfaceWhen to use: book of market premiums → need IV grid + per-quote Greeks (not a single contract). Shared rate/yield; each row has its own underlying (power/commodity forwards by maturity). Returns strike×maturity IV surface, fit quality, solv | $0.10 |
https://derivatives-pricer-production.up.railway.app/v1/portfolio/greeksWhen to use: multi-leg European book → need net MTM + net Greeks (long/short via signed quantity). Shared rate/yield; each leg has underlying, strike, T, type, quantity, vol. Optional dollar Greeks. Prefer scenario endpoint for what-if P&L. | $0.15 |
https://derivatives-pricer-production.up.railway.app/v1/option/scenario-from-surfaceWhen to use: book reval on an IV surface under F/rate/time/vol shocks with sticky moneyness|strike|fixed_vol. Vol order: interpolate → volAbs → volRel → smileTwist*k. Greeks are sticky-σ BS Greeks (not smile bump deltas). USDC exact on Sola | $0.15 |
https://derivatives-pricer-production.up.railway.app/v1/portfolio/scenarioWhen to use: what-if P&L under relative spot/vol shocks and calendar time decay on a European book. Returns base MTM+Greeks and per-scenario shocked MTM, MTM change, full Greeks. Single-option or multi-leg. USDC exact on Solana/Base. | $0.25 |
7 listing(s) with this pay-to wallet in the Bazaar catalog fetched 2026-10-17; showing up to 10. Prices as listed, not tested.
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Window: 7 days to 2026-10-16 UTC. Data: /api/v1/merchants/solana/DCi9X5mmacNGLeJvCw9fdWgX3G8V4QquDn4EuXATkcYr.json. Solana figures are a lower bound: Sampled: figment — 5,000 of 205,216 transactions decoded at random. Sampled payments are counted once (not scaled up), so Solana totals are a lower bound.