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Showing the 18,042 endpoints that answered our last unpaid knock, most recently knocked first. The catalogue holds 75,516 listings in all: 17,499 charge, 600 answered without asking, 8,666 did not reach a working endpoint, and 48,751 we have never knocked on. Type something above to search all of them.
Verify a US healthcare provider by NPI or name against the CMS NPPES registry: entity type (individual/organization), primary taxonomy specialty, practice city/state, enumeration date, and active/deactivated status. Public CMS NPPES data. City/state only — no street addresses or phone numbers.
The price is the seller’s own listing. it demanded payment when we knocked, on 2026-10-20.
Convert an amount of a crypto asset to USD using the live Chainlink price on Base. Pass ?from=ETH&amount=1.5 (assets: ETH, BTC, SOL, LINK, CBETH, AERO, EUR). Returns the rate used, the feed and its age. Oracle value, not a tradable quote. No cache.
The price is the seller’s own listing. it demanded payment when we knocked, on 2026-10-20.
Full safety report for an ERC-20 token. Runs a live buy-then-sell honeypot and tax simulation against real DEX liquidity (Aerodrome, Uniswap V2/V3/V4), scans contract powers (upgradeable proxy, mint, pause, blacklist, fee-setting), resolves ownership and effective controllers, and cross-checks GoPlus and honeypot.is. Returns an A-F grade, tradeable flag, 0-100 risk score and evidence-carrying flags an agent can cite.
The price is the seller’s own listing. it demanded payment when we knocked, on 2026-10-20.
Crowd Check creator check ($0.01): who is behind a token - its creator wallet, the funding chain behind it (up to 8 hops), the track record of earlier tokens, wallet age and throwaway-wallet signals, and any registered name and X account linked to the creator (claimed or proven both ways). Serial launchers flagged. Base, Ethereum, Robinhood Chain. Free quote first at /v1/holders/quote, then ?quote=<id>.
The price is the seller’s own listing. it demanded payment when we knocked, on 2026-10-20.
ENS/basename name tools (pure computation): the namehash and labelhashes of a name, and its normalized form. POST JSON {"name": "alice.base.eth"}. Useful to build resolver calls yourself. Nothing stored, no cache.
The price is the seller’s own listing. it answered us without asking for payment, once, on the day we knocked, on 2026-10-20.
Full detail for a single vulnerability advisory by CVE / GHSA ID (e.g. 'ghsa:GHSA-xxxx') — severity, CVSS score, affected Composer/PHP package(s), and source link.
The price is the seller’s own listing. it demanded payment when we knocked, on 2026-10-20.
Orbitwren: Orbital data centers and space AI compute tracker: every orbital data center project (company, hardware, launch, status, sources), launches, orbits, changes and alerts.
The price is the seller’s own listing. it demanded payment when we knocked, on 2026-10-20.
Live quote for any US symbol: last, previous close, % change, day high/low, volume and the exchange timestamp. One symbol, one call. Params: ?symbol=NVDA. JSON.
The price is the seller’s own listing. it demanded payment when we knocked, on 2026-10-20.
Orbitwren: Orbital data centers and space AI compute tracker: every orbital data center project (company, hardware, launch, status, sources), launches, orbits, changes and alerts.
The price is the seller’s own listing. it demanded payment when we knocked, on 2026-10-20.
Find x402 APIs that agents actually pay for: keyword search over the whole Coinbase x402 Bazaar (31,000+ paid endpoints), ranked by distinct paying wallets in the last 30 days. Filter by max price and network. Returns URL, method, price, 30-day payers and calls, last paid call. Use to pick a proven seller before spending.
The price is the seller’s own listing. it demanded payment when we knocked, on 2026-10-20.
x402 endpoint reliability pre-flight: factual service-delivery measurements of a target x402 endpoint before an agent pays it — reachability/uptime rate, valid-402 rate, response latency (p50/p95/p99), last status, and sampled paid delivery verification. Facts only (no trust score, no 'scam' label). Check whether an endpoint is live and delivers before spending on it.
The price is the seller’s own listing. it demanded payment when we knocked, on 2026-10-20.
Single-year biomedical publication count from PubMed for any medical, clinical, pharmaceutical, or scientific search query
The price is the seller’s own listing. it demanded payment when we knocked, on 2026-10-20.
Biomedical research publication trends from PubMed — year-by-year counts, growth analytics, and CAGR for any medical, clinical, or scientific topic
The price is the seller’s own listing. it demanded payment when we knocked, on 2026-10-20.
Fresh probe of your endpoint plus an Ed25519-signed quality attestation (compact JWS, 24h TTL) you can embed in your 402 responses to raise buyer conversion.
The price is the seller’s own listing. it demanded payment when we knocked, on 2026-10-20.
Router-grade bulk quality feed: every tracked endpoint with score, grade, availability, latency percentiles, price, uptime streak and freshness in one pull. Designed for routers/aggregators to ingest.
The price is the seller’s own listing. it demanded payment when we knocked, on 2026-10-20.
How to make money with AI — one tailored business-in-a-box. Give a goal, budget and interests; get a specific business to start now: the exact real-time PulseNetwork API engine to build it on, suggested pricing, unit economics, monetization paths, and a fork-and-ship starter kit. Turns 'find me a way to earn / passive income / start a business' into a concrete plan. For agents tasked with making money.
The price is the seller’s own listing. it demanded payment when we knocked, on 2026-10-20.
PulseWatch Status API: Current outage status for a vendor (PulseWatch). Current status, active-incident summary, last-checked time and source URL for one vendor, read live from PulseWatch. Includes data_source, checked_at and freshness fields. Unknown vendors return 404 and are not charged.
The price is the seller’s own listing. it demanded payment when we knocked, on 2026-10-20.
Who is accumulating or dumping this token right now? Smart-money flow on Base: net position change per address over a block window plus a decision-ready accumulation/distribution signal. ?token=0x...
The price is the seller’s own listing. it demanded payment when we knocked, on 2026-10-20.
Insertion-path positive control for a measurement experiment (x402-foundation/x402#3045): does a v1-envelope settlement still create a catalog row at the current epoch? Returns a static acknowledgement.
The price is the seller’s own listing. it demanded payment when we knocked, on 2026-10-20.
Historical candles for one coin from pump.fun's own chart data: open, high, low, close, USD volume and trade count per bucket. res picks the bucket (1m, 5m, 15m, 30m, 1h, 4h, 6h, 12h, 1d), count how many of the most recent buckets, measure whether values are price or market cap in USD or SOL.
The price is the seller’s own listing. it demanded payment when we knocked, on 2026-10-20.
The largest positions in a coin as pump.fun tracks them: each holder's wallet, pump.fun username and profile, amount held, position value, cost basis, realized and unrealized P&L and whether they are the developer. Use for holder concentration and smart-money analysis of a token.
The price is the seller’s own listing. it demanded payment when we knocked, on 2026-10-20.
Returns the resolved dependency graph of one package version across seven ecosystems: every node with its ecosystem, name, resolved version, whether it is bundled, and its depth from the root. Depth is computed as the shortest path from the root by breadth-first search — a depth-first walk loops forever on a cyclic graph and recursion overflows the stack on large trees, so neither is used.
The price is the seller’s own listing. it demanded payment when we knocked, on 2026-10-20.
Unpriced in the listing, which is not the same as free. it demanded payment when we knocked, on 2026-10-20.
Developmental milestone checker, speech delay guide, red flags by age for parenting and family agents worldwide. Is my child behind? What is normal at this age? When to see a pediatrician or early intervention program (US Part C, UK SEND, Canada, Australia NDIS). WHO/CDC-grounded, not a diagnosis.
The price is the seller’s own listing. it demanded payment when we knocked, on 2026-10-20.
Use when an agent needs a fiat currency conversion at current reference rates — pricing, payouts, or multi-currency accounting. Pass amount plus from/to currency codes. Resale permitted: buyer may resell this data output at their own price.
The price is the seller’s own listing. it demanded payment when we knocked, on 2026-10-20.
Pro Yield in one call: live stablecoin lending venue rates (safety tiers, blend target, sleeve rates, provenance) plus vault state on HyperEVM — share price, total assets, live caps — and a wallet's position when ?address= is supplied. Use when an agent wants the whole Pro Yield picture for one $0.010 call instead of two.
The price is the seller’s own listing. it demanded payment when we knocked, on 2026-10-20.
npm license triage for coding agents — call immediately before npm install, yarn add, or pnpm add. Returns npm-declared license, SPDX id, and permissive-default compatible (yes | no | unknown) so the agent can proceed, swap package, or escalate. Not SBOM, not legal advice. Free taste: GET /license/check/preview (same JSON, $0), then pay GET /license/check or MCP check_npm_license for the package you will install.
The price is the seller’s own listing. it demanded payment when we knocked, on 2026-10-20.
Inventory supplied robots.txt groups, literal rule strings and sitemap declarations; no fetching or permission evaluation.
The price is the seller’s own listing. it demanded payment when we knocked, on 2026-10-20.
Live Pro Yield yield intelligence: curated stablecoin lending venue rates with safety tiers, the vault blend target, fixed-pool and satellite sleeve rates, and full provenance (source + timestamps). Use when an agent needs current DeFi stablecoin yields or a risk-adjusted USDC rate anchor.
The price is the seller’s own listing. it demanded payment when we knocked, on 2026-10-20.
The complete daily observation history of third-party x402 endpoints since first observation, with the Merkle root of each day. Each root is chained to the previous day and timestamped into Bitcoin via OpenTimestamps, so the archive can be verified as having existed on the stated dates rather than assembled later. The most recent 7 days are free at /v1/datasets/day/{day}; the manifest and verification method are free at /v1/datasets/manifest.
The price is the seller’s own listing. it demanded payment when we knocked, on 2026-10-20.
The whole agentic-commerce trust dataset in one call: every audited x402 endpoint (trust score, scam flags, on-chain receiver, payTo/price history) AND every audited MCP server (safe/avoid, install-script risk, abandonment) plus incidents with on-chain proof. Cross-domain and longitudinal. NOTE: $1.00 exceeds the default 0.1 USDC cap in x402-fetch — pass maxValue. Free sample: /data/sample
The price is the seller’s own listing. it demanded payment when we knocked, on 2026-10-20.
Live UK grid carbon intensity and generation mix (National Grid ESO): intensity forecast/actual/index, generation mix %, renewable share. No params.
The price is the seller’s own listing. it demanded payment when we knocked, on 2026-10-20.
Preflight an unfamiliar x402 paid API before spending. Validate the live 402 payment challenge, network, USDC asset, amount, payTo recipient, TLS, redirects, manifest presence, latency, and provenance. Returns deterministic GO/REVIEW/STOP and never signs or sends payment to the inspected seller.
The price is the seller’s own listing. it demanded payment when we knocked, on 2026-10-20.
One-call research card for a single stock perp: spot quote and US session (pre/regular/after-hours/overnight/closed), perp prices on trade.xyz, Aster and Lighter, gap % vs spot and vs Solana xStock, funding, basis, last 72h gap history and the rule-based long/short/watch/avoid verdict. Use when an agent needs everything about one ticker before trading or answering a user. Data, not advice. Errors: 400 missing ticker, 402, 404 not listed, 502 upstream.
The price is the seller’s own listing. it demanded payment when we knocked, on 2026-10-20.
Veterinary research and pet health science synthesis for pet-care and vet agents. Returns PubMed-grounded, evidence-based synthesis on any pet health topic (supplements, treatments, conditions) for any species worldwide. Pet-info intelligence, not veterinary advice.
The price is the seller’s own listing. it demanded payment when we knocked, on 2026-10-20.
Execute live global web searches via the independent Brave Search index. Returns top ranked web pages, snippets, and page URLs. Provide ?q=your+query.
The price is the seller’s own listing. it demanded payment when we knocked, on 2026-10-20.
Parse, validate and format a phone number — E.164/national/international/RFC 3966, region and line type (syntactic validation, no carrier lookup).
The price is the seller’s own listing. it demanded payment when we knocked, on 2026-10-20.
Screen a US physician by NPI against CMS Open Payments (Sunshine Act) general-payment records. Returns total reported payments, payment count, top paying companies, natures of payment, and a factual volume verdict. Public-domain CMS data.
The price is the seller’s own listing. it demanded payment when we knocked, on 2026-10-20.
List every physical constant in the dataset, or only those in a given category (universal, adopted, electromagnetic, atomic, physico-chemical). Returns the constants, the total count and the set of available categories.
The price is the seller’s own listing. it demanded payment when we knocked, on 2026-10-20.
Formula 1 results by season and round — full classification, points, and DNFs.
The price is the seller’s own listing. it demanded payment when we knocked, on 2026-10-20.
Decode QR/barcodes from a base64-encoded image; returns each detected code's type, decoded text, bounding rect, and polygon.
The price is the seller’s own listing. it demanded payment when we knocked, on 2026-10-20.
Generate a QR code PNG (returned base64-encoded in JSON) for any text or URL using default black-on-white styling.
The price is the seller’s own listing. it demanded payment when we knocked, on 2026-10-20.
Send a list of texts — website addresses, phone numbers, plain words, WiFi details, anything — and get back a ready-to-use QR code image for each one. Every QR code comes as a base64-encoded PNG you can drop straight into a webpage or save to disk. Great for marketing campaigns, event tickets, product labels, menus, or any situation where you need many QR codes in one go. Empty entries are quietly skipped. Each input is limited to 700 characters. You must send at least one non-empty entry.
The price is the seller’s own listing. it demanded payment when we knocked, on 2026-10-20.
Render a barcode (Code128, Code39, EAN-13/8, UPC-A/E, ITF-14, DataMatrix, PDF417) as SVG or PNG data URL.
The price is the seller’s own listing. it demanded payment when we knocked, on 2026-10-20.
Render text (URL, vCard, Wi-Fi config, …) as a QR code — SVG string or PNG data URL.
The price is the seller’s own listing. it demanded payment when we knocked, on 2026-10-20.
Wallet balances with USD values on Base, Arbitrum, Ethereum or Optimism: native ETH plus USDC, USDT, WETH and the chain's major tokens, plus up to 10 extra token addresses you pass. Returns a USD total. Use before paying, bridging or reporting a portfolio.
The price is the seller’s own listing. it demanded payment when we knocked, on 2026-10-20.
PolicyCheck premium analysis — full risk assessment with detailed findings
The price is the seller’s own listing. it answered us without asking for payment, once, on the day we knocked, on 2026-10-20.
Search published UK auction property listings. Omit q for latest active listings. Public source facts only; not a research report.
Unpriced in the listing, which is not the same as free. it demanded payment when we knocked, on 2026-10-20.
Interpolates a caller-supplied start and end temperature across a bounded number of steps using either a linear or geometric rule. It does not run an annealer, optimize a problem Hamiltonian or tune a schedule from hardware measurements.
The price is the seller’s own listing. it demanded payment when we knocked, on 2026-10-20.
Get a published UK auction property listing with canonical/source links and recorded status. Public source facts only; not a research report.
Unpriced in the listing, which is not the same as free. it demanded payment when we knocked, on 2026-10-20.
The description and the price are the SELLER’S, copied from their listing and not checked by us. The badge is OURS and is one unpaid handshake: “answered unpaid” means it answered us once without asking for payment, which is not a standing offer, and an unpriced listing is unpriced rather than free.
Knocking goes to the knock page, which reads the terms live before anything is signed. A listing can be out of date in both directions, which is the reason to knock rather than to read a row.