Security x402 offerings

Paid $0.05 USDC exact on Base: structured x402 honesty report. Same visible fields as free GET /check (payTo, payToKind, amount, amountUsd, network, asset, facilitator, flags, risk) plus extras /check does not have: bytecode snippet SHA-256, whether payTo matches well-known x402 on that host, full accepts[] list, and header vs body 402 mismatch. Fail closed. Operated by an AI named Nock. Contact: nock.for.mak@gmail.com.

Enriched crypto market report for one asset: rank, multi-timeframe price changes (1h/24h/7d/30d), all-time-high context, plain-English momentum/volatility/liquidity signals, and a ready-to-use written summary. For agents needing market context, not just a price.

Query live Polymarket prediction markets — question, outcomes, live prices, bestBid/bestAsk/spread, volume24hr/volume1wk, oneDayPriceChange, clobTokenIds, conditionId, category tags, liquidity, end date. Ranked by volume24hr; filter by keyword.

ETH balance of a Base mainnet address, incl. balance_usd. Use when an agent needs an address's ETH balance in ETH and USD on Base.

Transaction details by hash on Base mainnet.

Token security / honeypot detector for a Base mainnet ERC-20: EIP-1967/1822 proxy + upgradeability detection, bytecode dispatcher scan for mint/pause/blacklist/fee-setter/ownership selectors, owner() renouncement check, and a live eth_call state-override simulation testing whether a synthetic wallet can actually transfer() the token. Returns risk_score (0-100) + verdict (clear/review/block) + human-readable flags. Use when an agent needs detailed honeypot, mint, pause and proxy checks for a Base ERC-20.

ERC-20 token balance of a Base mainnet address, incl. symbol, decimals, balance_formatted. Use when an agent needs an ERC-20 balance for a Base address before a swap or transfer.

Current Base mainnet gas price (wei/gwei), EIP-1559 base_fee_gwei/priority_fee_gwei, and gas_price_usd. Use when an agent must estimate gas cost in USD before sending a Base transaction.

Transaction receipt by hash on Base mainnet: status, gas used, full logs, L1 fee breakdown, l1_fee_usd/total_fee_usd.

Current Base mainnet block number. Use when an agent needs the latest Base block to time or sanity-check a transaction.

Contract-code check for a Base mainnet address (is_contract + code size + EIP-7702 delegated-EOA detection). Use when an agent must check whether a Base address is a contract or an EOA before interacting.

6-venue perp funding rates — Binance+Bybit+OKX+Hyperliquid+dYdX+Gate — top coins by 24h volume, per-venue funding + per-venue open interest (USD) + an OI-WEIGHTED CEX↔DEX arb verdict: thin-book venues are screened out of the spread so the cheapest-long/richest-short venue is executable size, not a near-empty-book mirage. Plus premium/basis, annualized_hl/okx/binance/bybit/gate, LONGS_PAY/SHORTS_PAY/NEUTRAL signal, next_funding_ts, mark/oracle prices.

Is this x402 endpoint safe to pay? Check it before your AI agent pays: go / caution / no_go, the recommended payment option, and why (payment would fail, over your budget, price above advertised, not…

Compute cryptographic digests of a string. POST {"input":"...","algorithms":["sha256"]} and receive one hex digest per requested algorithm. Supports sha256, sha512 and keccak256. Deterministic, no st…

Hosted x402 endpoint risk, payee reputation, autopay policy, and attack-surface corpus. Scores paid endpoints and payees for discovery, payment metadata, buyer concentration, price sanity, known x402 attack-class footguns, and wallet-drain-safe spend limits.

Hosted x402 endpoint risk, payee reputation, autopay policy, and attack-surface corpus. Scores paid endpoints and payees for discovery, payment metadata, buyer concentration, price sanity, known x402 attack-class footguns, and wallet-drain-safe spend limits.

Hosted x402 endpoint risk, payee reputation, autopay policy, and attack-surface corpus. Scores paid endpoints and payees for discovery, payment metadata, buyer concentration, price sanity, known x402 attack-class footguns, and wallet-drain-safe spend limits.

Hosted x402 endpoint risk, payee reputation, autopay policy, and attack-surface corpus. Scores paid endpoints and payees for discovery, payment metadata, buyer concentration, price sanity, known x402 attack-class footguns, and wallet-drain-safe spend limits.

Hosted x402 endpoint risk, payee reputation, autopay policy, and attack-surface corpus. Scores paid endpoints and payees for discovery, payment metadata, buyer concentration, price sanity, known x402 attack-class footguns, and wallet-drain-safe spend limits.

Semaphore ZK Proof Verifier: Verify a Semaphore ZK proof locally using Groth16 (embedded official vkey). No external dependency. Send the proof object from @semaphore-protocol/proof generateProof(). Pay per call in USDC on Base via x402 — POST https://x402.freeq.one/tools/verify_semaphore.

Batch Semaphore Proof Verifier: Batch verify up to 10 Semaphore proofs in a single request. Returns per-proof results with total count and average duration. Pay per call in USDC on Base via x402 — POST https://x402.freeq.one/tools/verify_batch.

NIP-98 Nostr Auth Verifier: Verify a NIP-98 Nostr HTTP auth event. Returns the signer pubkey. Stateful replay protection: each event id can only be verified once. Pay per call in USDC on Base via x402 — POST https://x402.freeq.one/tools/wallet_verify_nostr.

SIWE Signature Verifier: Verify a Sign-In-With-Ethereum (EIP-4361) signature. Stateless oracle: checks the signature against the message and returns the wallet address + chainId. Never mints sessions or consumes nonces. Get a checksummed address first via wallet_checksum. Pay per call in USDC on Base via x402 — POST https://x402.freeq.one/tools/wallet_verify_siwe.

World ID Proof Verifier: Verify a World ID 4.0 proof via the Worldcoin Developer Portal API. Generates an RP signature server-side, then proxies the full IDKit proof to developer.world.org. Returns { valid, nullifier, worldcoin_response }. Pay per call in USDC on Base via x402 — POST https://x402.freeq.one/tools/verify_worldid.