the402 x402 endpoint directory

X402 Settlement Network Check: X402 Settlement Network Check compares settlement chain with the accepted challenge net

X402 Settlement Recipient Check: X402 Settlement Recipient Check compares settlement recipient with the accepted pay-t

X402 Settlement Amount Check: X402 Settlement Amount Check compares settled raw amount with the accepted challenge amo

X402 Response Header Shape: X402 Response Header Shape checks a payment-response header for bounded base64 or JSON sha

CSV Trim Cells: CSV Trim Cells trims surrounding whitespace from every bounded CSV cell from bounded caller-supplied v

Lite validate object required keys and types vs a tiny schema. Call when agent preflight without full jsonschema engin

X402 Payment Replay Key: X402 Payment Replay Key derives a stable non-secret replay-detection key from payment metadat

X402 Payment Deadline Check: X402 Payment Deadline Check checks payment authorization deadline against caller time bud

X402 Payment Nonce Check: X402 Payment Nonce Check checks a payment nonce for presence, length, and caller-known reuse

X402 Payment Payload Size: X402 Payment Payload Size checks serialized payment payload bytes against a buyer limit fro

X402 Payment Header Shape: X402 Payment Header Shape checks a caller-supplied payment header for bounded base64 or JSO

X402 Accepts Rank: X402 Accepts Rank ranks challenge accepts entries against buyer network and asset preferences from

X402 Scheme Select: X402 Scheme Select selects the first buyer-supported payment scheme from challenge options from bo

X402 Resource Match: X402 Resource Match compares challenge resource URL with the intended paid resource from bounded

X402 Timeout Check: X402 Timeout Check checks challenge expiration and minimum buyer processing time from bounded call

X402 Pay To Match: X402 Pay To Match compares challenge pay-to address with an expected merchant address from bounded

X402 Amount Budget Check: X402 Amount Budget Check checks challenge raw amount against an exact buyer call budget from

X402 Asset Match: X402 Asset Match compares a challenge asset identifier with buyer-supported assets from bounded call

X402 Network Match: X402 Network Match compares a challenge network identifier with buyer-supported networks from boun

X402 Challenge Version Check: X402 Challenge Version Check compares challenge protocol version with supported versions

X402 Challenge Shape Check: X402 Challenge Shape Check checks required top-level fields in a caller-supplied payment c

Normalize await/job status fields for media-long jobs. Call when agents polling long jobs need a stable status shape.

Fill a Demand Board RFQ template for crypto math needs. Call when posting structured RFQs for offline calc skills. Ret

Remaining SLA seconds from deadline and now. Call when buyer agents tracking SLA burn-down. Returns remaining_seconds

Evaluate simple refund eligibility flags against policy JSON. Call when agents checking refund windows before opening

Generate a minimal skill.md body for a product cluster. Call when agents need a portable skill skeleton for a Delx pac

Rank candidate tool names by token overlap with a query. Call when routing a natural-language intent to top SKU names

Upper-bound CPMM price impact loss for size vs reserves. Call when pre-trade MEV/slippage stress without mempool acces

Time-weighted absolute peg deviation over samples. Call when summarizing depeg severity over a sample window. Returns

Peg deviation in bps from target (usually 1.0). Call when monitoring stablecoin depegs with caller prices. Returns dev

Fees needed to offset IL at a price ratio. Call when checking if fee APR can cover expected IL. Returns fee_fraction_n

Classic CPMM impermanent loss from price ratio. Call when LP risk before providing liquidity. Returns il_fraction and

Premium (mark-index)/index in bps. Call when monitoring perp basis without live feeds (caller prices). Returns premium

OLS hedge ratio beta of y on x (no intercept). Call when sizing the short leg in a pairs trade offline. Returns beta a

Z-score of spread series for pairs trading. Call when mean-reversion signals from a price-spread series. Returns zscor

Historical CVaR/ES at alpha from return samples. Call when tail risk budgeting without a full risk engine. Returns var

Inverse-vol risk parity weights from return series. Call when allocating across assets by inverse volatility offline.

Compare average fill to VWAP benchmark (bps). Call when post-trade quality vs a caller-supplied VWAP. Returns slippage

Compare average fill to TWAP benchmark (bps). Call when post-trade quality vs a caller-supplied TWAP. Returns slippage

Lite constant-product amount when price stays in a range. Call when estimating concentrated LP swaps without on-chain

Payoff points for multi-leg options at sample spots. Call when diagramming a structured option package offline. Return

Advisory liq price ladder over leverage steps. Call when stressing sequential leverage reductions toward liquidation.

Implied spot from future and annualized carry over days. Call when backing out fair spot from futures + carry assumpti

Annualize futures-spot basis percent. Call when carry trades need annualized basis from raw premium. Returns basis_apr

Annualize a period funding rate (e.g. 8h → APR). Call when comparing funding across venues with different periods. Ret

Delta/gamma/vega/theta lite for European call (BS). Call when risk report needs a compact Greeks pack offline. Returns

Call/put delta from BS closed form. Call when delta-hedging or option inventory needs BS delta. Returns delta for call

Compute Black-Scholes d1 and d2 from spot/strike/vol/time/rate. Call when you need BS inputs for Greeks without a mark

Sum price*size depth notional for a side ladder. Call when risk needs notional available within N levels. Returns dept

Book imbalance (bid_size-ask_size)/(bid_size+ask_size). Call when sizing or signal needs L1 size imbalance. Returns im