Blockchain And Crypto x402 offerings

Seeded Holdout Assignment: Seeded Holdout Assignment assigns a stable subject to holdout or treatment from bounded caller-supplied values without an external provider. Call Seeded Holdout Assignment …

Seeded Pairing: Seeded Pairing creates reproducible non-overlapping pairs and reports an optional bye from bounded caller-supplied values without an external provider. Call Seeded Pairing when an age…

List observed US federal holidays for a year for $0.002 USDC. Call when you need this bounded result without an API key or subscription. Returns machine-readable JSON via x402 on Base or Solana. Limi…

X402 Settlement Tx Shape: X402 Settlement Tx Shape checks a settlement transaction identifier for expected chain shape from bounded caller-supplied values without an external provider. Call X402 Sett…

EVM Chain Id Hex Normalize: EVM Chain Id Hex Normalize converts decimal or hexadecimal chain identifiers into both forms from bounded caller-supplied values without an external provider. Call EVM Cha…

Convert between wei and ether using fixed 1e18 scaling without RPC — call when converting wei↔ether with fixed 1e18 scaling. Use for chain input hygiene without live RPC—adjacent to OneSource-class s…

X402 Refund Deadline Check: X402 Refund Deadline Check checks a refund request timestamp against a policy window from bounded caller-supplied values without an external provider. Call X402 Refund Dea…

EVM Blob Fee Budget: EVM Blob Fee Budget calculates a worst-case blob fee from blob gas and fee cap from bounded caller-supplied values without an external provider. Call EVM Blob Fee Budget before s…

Annualize a period funding rate (e.g. 8h → APR). Call when comparing funding across venues with different periods. Returns apr and periods_per_year as deterministic JSON for $0.001 USDC via x402 on B…

Constant-product AMM output amount for a given input size. Call when simulating x*y=k swaps offline from reserves you already know. Returns amount out and new reserves as deterministic JSON for $0.00…

Validate Bitcoin-base58 alphabet membership for local address hygiene — call when checking Bitcoin-base58 alphabet membership locally. Use for chain input hygiene without live RPC—adjacent to OneSour…

X402 Accepts Rank: X402 Accepts Rank ranks challenge accepts entries against buyer network and asset preferences from bounded caller-supplied values without an external provider. Call X402 Accepts Ra…

Skew an inventory target away from neutral for MM heuristics. Call when simple market-making inventory tilt without a full strategy engine. Returns skewed inventory target as deterministic JSON for $…

Upper-bound CPMM price impact loss for size vs reserves. Call when pre-trade MEV/slippage stress without mempool access. Returns impact_fraction and loss_notional as deterministic JSON for $0.001 USD…

X402 Refund Receipt Check: X402 Refund Receipt Check checks caller-supplied refund receipt identifiers, amount, and status from bounded caller-supplied values without an external provider. Call X402 …

EVM Native Balance Budget: checks caller-supplied native balance against value plus fee reserve using only bounded caller-supplied values. Call when you need a bounded evm native balance budget resul…

Max loss dollars for size and stop distance. Call when pre-trade loss caps and kill-switch thresholds. Returns max loss dollars as deterministic JSON for $0.001 USDC via x402 on Base. First-party loc…

Notional value = mark price × size for sizing and risk. Call when risk engines that need exposure before leverage math. Returns notional quote value as deterministic JSON for $0.001 USDC via x402 on …

Estimate gas cost in USD given used gas, price, and ETH/USD. Call when operator reports that need approximate dollar gas spend. Returns usd cost estimate (caller supplies eth price) as deterministic …

Validate a 32-byte transaction hash format and normalize casing — call when validating a 32-byte transaction hash format. Use for chain input hygiene without live RPC—adjacent to OneSource-class smal…

Convert percent values into basis points (1% = 100 bps). Call when bridging UI percent inputs into bps-based trading configs. Returns bps = pct*100 as deterministic JSON for $0.001 USDC via x402 on B…

EVM Confirmation Count: calculates confirmations from inclusion and current block numbers using only bounded caller-supplied values. Call when you need a bounded evm confirmation count result before …

Funding payment ≈ notional × funding_rate for a period. Call when estimating perp funding drag/credit offline. Returns funding payment in quote as deterministic JSON for $0.001 USDC via x402 on Base.…

Base Payment Deadline Check: Base Payment Deadline Check checks a Base payment deadline against minimum and maximum lead time from bounded caller-supplied values without an external provider. Call Ba…