x402 service explorer

CREATE2 deterministic contract address calculator — derive the EIP-1014 EVM deployment address, preimage, hashes, and EIP-55 checksum offline without RPC.

EVM address checksum and validation tool — normalize one Ethereum-compatible address and validate mixed-case EIP-55 input offline.

Solidity ABI calldata encoder — encode canonical typed values for an EVM smart-contract function call, with an optional selector and exact 256-bit integers.

Strict Solidity ABI calldata decoder — decode canonical EVM smart-contract function calls or typed values, verify selectors, and reject ambiguous offsets or padding.

0/1 knapsack solver — exact work-bounded capacity planning and portfolio selection for maximum value, with deterministic ties and reproducible DP evidence.

Weighted interval scheduling solver — exact maximum-weight compatible job scheduling with half-open intervals and a complete dynamic-programming certificate.

Bin-packing heuristic — deterministic best-fit-decreasing capacity planning for placing items into bins, with feasibility evidence and an honest volume bound.

Assignment solver — exact minimum-cost worker-to-task matching for resource allocation, with deterministic choices and a primal/dual optimality certificate.

Package vulnerability check — check one exact open-source dependency version or purl against OSV, enrich CVE matches with CISA KEV known-exploited signals, and report fix

Batch dependency vulnerability check — check ordered exact package versions in OSV with deduplicated CVE enrichment, explicit completeness, and CISA KEV known-exploited s

Trivia Daily answer check — validates one opaque choice ID and explains correct answers from the curated record.

Shortest Path daily graph — find the unique minimum-weight route in a deterministic directed or undirected graph.

Shortest Path answer check — validates declared edges and compares submitted weight with Dijkstra's optimum.

Gridlock daily maze — find an optimal orthogonal route through a deterministic bounded obstacle grid.

Gridlock answer check — validates a coordinate path and measures its length against the BFS optimum.

Chess Daily tactics puzzle — solve a deterministic UTC daily position from a pinned CC0 Lichess subset using legal UCI moves.

Chess Daily answer check — legally validates a complete UCI principal line against the pinned daily puzzle.

Full Instagram profile by username — bio, follower and following counts, posts count, verified and business account flags, category, contact email, external and bio links

Page through an Instagram account's posts by username — captions, like and comment counts, media type, video duration, image and thumbnail URLs, post permalinks, tagged u

eBay sold comps — sold & completed listings with realized prices and sold dates for pricing research and resale valuation, filterable by site, category, price band and co

eBay listing detail — one listing by product id: buy options & current bid, variants, shipping to a supported destination, seller reputation, item specifics, stock & watc

Hotel details & rates — one hotel's full profile by property token: address, phone, per-booking-site nightly & total rates, rooms, amenities & review breakdown as clean J

Hotel photos — a hotel's photo library by property token, grouped into themed sections with full-size URLs, thumbnails, dimensions & paging.

Apple App Store reviews (path variant) — an app's user reviews by product_id in the URL: title, text, rating, version, author & date, with paging & sort, as clean JSON.

Apple App Store product details (path variant) — full profile for a single app by product_id in the URL: rating, price, description, version history, screenshots & metada

Get a paginated timeline of replies from an X user.

Get a paginated timeline of media posts from an X user.

Get the highlighted posts selected on an X user profile.

Get the extended About information for a public X user.

List the geographic locations available for Twitter/X trends, including WOEIDs, place types and country details.

Get complete public information for an X community.

Google Patents details — retrieve one patent by patent_id with abstract, claims, inventors, assignees, dates, classifications, family applications, images and PDF as clea

Reference data for the Telegram analytics API: countries, categories and languages used for filters and targeting.

Compute zakat due on wealth: cash, gold, silver, business inventory, receivables, crypto and stocks, less deductible liabilities. Returns the nisab threshold under BOTH t

High-precision Islamic prayer times (fajr, sunrise, dhuhr, asr, maghrib, isha) plus qibla direction for any coordinates and date. Pure astronomical computation (adhan lib

CVE lookup by ID from NVD (CVSS score, severity, description)

Check agent outputs for quality issues, inconsistency, and behavioral drift.

Baseline safety screening for harmful, unsafe, or policy-violating agent outputs.

Detect jailbreaks, prompt injection, and instruction conflicts before the agent follows them.

Higher-confidence evaluation for high-impact, sensitive, or difficult-to-reverse agent actions.

Compare caller-supplied before and after source snapshots without execution or network access, returning source fingerprints, syntax regressions, structural deltas, funct

LinkedIn candidate search on demand — full name, job title/headline, profile URL, and bio snippet. Priced $0.05 per candidate (minimum 1, up to 50 per search). Enter a jo

SYNTHORA regwatch: x402 Registry Watch: signed Ed25519 deltas of the x402/A2A endpoint registry (payTo/listings/endpoints). Pay-per-event feed pull. POST {"since":"<curso

SYNTHORA defi-llama-tvl-ranking: Top DeFi protocols by TVL with rank, chain, category and 1d/7d change, capped list (default 50, max 200 via {"limit":N}). Source: api.lla

SYNTHORA top-crypto: Top N cryptocurrencies by market cap (default 10, max 50): rank, price, 24h change, volume and market cap in USD. Source: CoinGecko free API, keyless

Durability checklist for a surviving launch: nine criteria (survival, real holders, concentration, airdrop inflation, holder growth, liquidity, recency, deployer record,

Did sells actually execute in this pool? Returns observed sell count and total swaps from our chain node. An execution observation, not a contract audit and not a honeypo

Latest sealed five-minute LUMI, TENNA, and consensus forecast from TENNA Observatory, including English commentary, recent accuracy, and eligible live edge-node consensus

Agent402. $0.001 pure-function scaffold: natural-language description → JS/Python leaf code + OpenAPI fragment + x402 call pattern. Deterministic templates (no LLM). Teac

Telegram reach analytics: average post reach chart for a channel, how many people typical posts reach over time.