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Showing the 20,881 endpoints that answered our last unpaid knock, most recently knocked first. The catalogue holds 79,624 listings in all: 20,182 charge, 756 answered without asking, 9,231 did not reach a working endpoint, and 49,455 we have never knocked on. Type something above to search all of them.
Extract public business emails, phone numbers, and social profiles from a website. Batch-safe contact enrichment for autonomous agents. Input: website URL. Returns structured JSON.
The price is the seller’s own listing. it demanded payment when we knocked, on 2026-10-22.
Residential proxy for AI agents. Pay for gigabytes of traffic and get a proxy login (host, port, username, password) after payment, to use with curl, a browser or any HTTP client. Choose a country, rotate the IP on every connection or keep one with a session tag. A pack lasts 90 days. Pay per pack in stablecoins.
The price is the seller’s own listing. it demanded payment when we knocked, on 2026-10-22.
Retrieve a specific contact's full profile by ID.
The price is the seller’s own listing. it demanded payment when we knocked, on 2026-10-22.
The latest stored reading for a host: three rating instruments plus what it answered when asked — dated, never live, and it says how old it is
The price is the seller’s own listing. it demanded payment when we knocked, on 2026-10-22.
Where a live x402 resource stands with the registries — Bazaar, x402scan, and on-chain
The price is the seller’s own listing. it demanded payment when we knocked, on 2026-10-22.
SEC Form 4 filings reporting changes in beneficial ownership of securities. Filed by corporate insiders (directors, officers, and 10%+ shareholders) within two business days of a transaction. Can't find what you're looking for? POST feedback to /feedback, no charge.
The price is the seller’s own listing. it demanded payment when we knocked, on 2026-10-22.
SEC Form 3 filings reporting initial statements of beneficial ownership of securities. Filed by corporate insiders (directors, officers, and 10%+ shareholders) when they first acquire a position. Can't find what you're looking for? POST feedback to /feedback, no charge.
The price is the seller’s own listing. it demanded payment when we knocked, on 2026-10-22.
SEC Form 13F filings data showing institutional investment manager holdings. Form 13F is required to be filed quarterly by institutional investment managers with at least $100 million in qualifying assets under management. Can't find what you're looking for? POST feedback to /feedback, no charge.
The price is the seller’s own listing. it demanded payment when we knocked, on 2026-10-22.
For work that outlives one HTTP response. You submit steps, each an HTTP request against a public address; the job is acknowledged at once and runs in the background, and the collected results are POSTed to your callback URL when finished. Every step reports its status, timing, response headers and body up to 256 KB, and a failing step never aborts the others. Price is 0.003 USDC per step, quoted before payment.
The price is the seller’s own listing. it demanded payment when we knocked, on 2026-10-22.
Takes a base64 file up to 25 MB and stores it for as long as you say, at most seven days. You get a download URL carrying a 32-byte token; whoever holds the link can fetch the file once or up to a limit you set, with no payment and no account. Price is 0.004 USDC per started megabyte, quoted before payment from the size you declare. Actions: store, status, delete.
The price is the seller’s own listing. it demanded payment when we knocked, on 2026-10-22.
Takes a list of candidate intents, each described by attributes, plus whatever is already known, and returns the one attribute worth asking about next. Candidates contradicted by the known values are ruled out first and listed with the attribute that excluded them; a candidate that simply does not declare a known attribute is kept, because silence is not a contradiction.
The price is the seller’s own listing. it demanded payment when we knocked, on 2026-10-22.
Social marketing orders: followers, likes, views and more across 1000+ services. Price is quoted per order (from $0.10) via GET /v1/smm-quote.
The price is the seller’s own listing. it demanded payment when we knocked, on 2026-10-22.
Receive-only email inbox on a clean domain for 7 days — for account verifications without phone, captcha or personal address. No sending.
The price is the seller’s own listing. it demanded payment when we knocked, on 2026-10-22.
Wallet/contract state on 5 EVM chains in one call: native balance, nonce, EOA-or-contract (EIP-7702-aware), ERC-20 balances with symbol and decimals
The price is the seller’s own listing. it demanded payment when we knocked, on 2026-10-22.
Current Amazon deals with filters
The price is the seller’s own listing. it demanded payment when we knocked, on 2026-10-22.
Current Amazon best-seller rankings for any category or subcategory, with rank, ASIN, title, price and rating for each entry. Paginated and available across 23 country marketplaces. Useful for trend detection, category research and product sourcing.
The price is the seller’s own listing. it demanded payment when we knocked, on 2026-10-22.
Live Amazon offer and inventory data for up to 10 ASINs: every active offer with seller, price, shipping and condition, which one holds the buy box, and optionally the real purchasable stock quantity. Built for repricing, buy-box monitoring and stock-out alerting across 23 marketplaces.
The price is the seller’s own listing. it demanded payment when we knocked, on 2026-10-22.
Absurd agent-themed daily horoscope full of API calls and cosmic latency.
The price is the seller’s own listing. it demanded payment when we knocked, on 2026-10-22.
Join the Golden Ticket Club: a personalized AI prophecy plus a permanent numbered entry in the public ledger. Only 100 exist. A golden_key from posting a wish at /api/wishlist ($0.001) is optional — pay without one and you are admitted anyway, with a wish recorded on your behalf.
The price is the seller’s own listing. it answered us without asking for payment, once, on the day we knocked, on 2026-10-22.
Fortune cookie with unique fortune and lucky numbers for AI agents.
The price is the seller’s own listing. it demanded payment when we knocked, on 2026-10-22.
Use when several x402 endpoints offer the same thing: pre-flights up to 10 (repeat ?url=) and ranks them, cheapest live payable option first. Errors (never charged): 400 bad input, 422 source could not be fetched or parsed, 429 rate limited (30/min), 502 upstream failed.
The price is the seller’s own listing. it demanded payment when we knocked, on 2026-10-22.
Use before paying any x402 endpoint, so you don't pay a dead or mispriced one: checks it is alive, correctly payment-gated, its price/network/asset, latency, and whether it fits your max_price_usd. Sends one unpaid request, never pays. ~9% of paid listings we scanned were dead. Errors (never charged): 400 bad input, 422 source could not be fetched or parsed, 429 rate limited (30/min), 502 upstream failed.
The price is the seller’s own listing. it demanded payment when we knocked, on 2026-10-22.
x402 market intelligence from the full Agentic Market catalog (31k endpoints) plus our liveness scan: where buyers pay, crowded vs underserved niches, top sellers, dead share. Optional ?q= filter.
The price is the seller’s own listing. it demanded payment when we knocked, on 2026-10-22.
Shortest Path daily graph — find the unique minimum-weight route in a deterministic directed or undirected graph.
The price is the seller’s own listing. it demanded payment when we knocked, on 2026-10-22.
Gridlock daily maze — find an optimal orthogonal route through a deterministic bounded obstacle grid.
The price is the seller’s own listing. it demanded payment when we knocked, on 2026-10-22.
Google Search results (SERP) for a query, as JSON. Each record is one results page with organicResults (position, title, url, displayedUrl, description), paidResults, relatedQueries, peopleAlsoAsk and searchQuery metadata. Body: {query, limit}. limit (1-20) is rounded up to whole pages of about 10 results, so 1-10 returns one page and 11-20 returns two. Useful for rank checks, source discovery and grounding answers in search results.
The price is the seller’s own listing. it demanded payment when we knocked, on 2026-10-22.
Google News search API for AI agents: send a keyword or phrase and get up to 30 current news articles as JSON: headline, publisher, publish time, a short description and the article's link. Choose the language and country edition. Articles you paid for but did not get are refunded.
The price is the seller’s own listing. it demanded payment when we knocked, on 2026-10-22.
Google Maps reviews API for AI agents: send a place_id or a Google Maps place URL and get up to 50 reviews as JSON: stars, text and its translation, date, likes, the owner's reply, plus the place's name, address and rating. Sort by newest, relevant, highest or lowest. Reviewer names, profiles and photos are not returned. A place with no reviews is not charged; reviews you paid for but did not get are refunded.
The price is the seller’s own listing. it demanded payment when we knocked, on 2026-10-22.
[3-LEG] Biodiversity credit chain, one project (?entity=uk-bng-warwickshire): leading standard-body pipeline pressure - registry status change, methodology revision, rating downgrade -> current current registry state -> realized lifecycle outcome (confirmation gate). A sequential chain, not one reading - confidence = how many legs are lit, in order. Sources: registry and standard-body feeds. Descriptive only, never a forecast or advice. No data -> 422 no_charge, not billed.
The price is the seller’s own listing. it demanded payment when we knocked, on 2026-10-22.
[3-LEG] AI dataset takedown chain, one dataset (?entity=laion-5b): leading access pressure from gating and legal notices -> current current availability -> realized lifecycle to gated, withdrawn or deleted (confirmation gate). A sequential chain, not one reading - confidence = how many legs are lit, in order. Sources: host registries and official notices. Descriptive only, never a forecast or advice. No data -> 422 no_charge, not billed.
The price is the seller’s own listing. it demanded payment when we knocked, on 2026-10-22.
Add-on, air quality for one location: US AQI category and PM2.5 reading from EPA and CAMS official feeds. Descriptive only, never a forecast or advice. No data -> 422 no_charge, not billed. Every record carries an offline-recomputable record_hash.
The price is the seller’s own listing. it demanded payment when we knocked, on 2026-10-22.
Returns network-wide totals: total x402 events, service count, and a UA classification breakdown (agent vs browser vs bot). Use it to benchmark your service's agent-traffic share against the network.
The price is the seller’s own listing. it demanded payment when we knocked, on 2026-10-22.
x402 protocol updates as JSON: recently merged changes in the x402 Foundation repository (formerly coinbase/x402), latest tags, and current npm versions of the @x402 packages (core, evm, express, fetch, extensions) and @coinbase/x402. Read live from GitHub and npm, with links.
The price is the seller’s own listing. it demanded payment when we knocked, on 2026-10-22.
Quick review: does an AI crawler (GPTBot, ClaudeBot, PerplexityBot, OAI-SearchBot) actually see your site? Every rule, no model: $0.1 for one check. Returns the score, findings by severity and the five that matter most (empty JS shell, soft 404, www/apex, robots vs AI bots, sitemap) with evidence. Fixes, a model verdict and a listing: the full check at https://402registry.com/buy/one. A passing review queues the site for the free catalog check. No account, no card, no human.
The price is the seller’s own listing. it demanded payment when we knocked, on 2026-10-22.
Use when you need an official daily FX rate or currency conversion (USD, EUR, KRW, JPY, CNY, GBP + 24 more). Input: base (default EUR), optional symbols (comma list), date (YYYY-MM-DD, last ~90 days; weekends use the prior fixing), amount. Output: JSON rates for the fixing date, % change vs prior fixing, converted amounts, raw ECB EUR rates. Source: ECB statistics, updated each TARGET day ~16:00 CET; reference only. Example: ?base=USD&symbols=KRW,JPY&amount=100
The price is the seller’s own listing. it demanded payment when we knocked, on 2026-10-22.
Use when you need actual apartment sale prices in a South Korean district for a month (property research, valuation, comps). Data: MOLIT (Korea land ministry) reported deals since 2006, updated daily. Input: region (5-digit LAWD_CD, e.g. 11680 Gangnam-gu), month (YYYYMM). Output: JSON trades with contract date, complex (Korean + romanized), area m2, floor, build year, price in KRW and USD, price per m2, deal type, cancelled flag. Example: ?region=11680&month=202609
The price is the seller’s own listing. it demanded payment when we knocked, on 2026-10-22.
AI search visibility progress report — Four Layers scoring (SXO/AIO/GEO/AEO), what's working, gaps, and your next 3 highest-impact actions. 1.50 USDC.
The price is the seller’s own listing. it demanded payment when we knocked, on 2026-10-22.
Selects supplied official import-document requirements for code and origin. Missing facts are returned as null and named in unavailable_fields where applicable. Derived values disclose their method; source-backed values disclose source, time window and age. This is neither legal advice nor customs advice.
The price is the seller’s own listing. it demanded payment when we knocked, on 2026-10-22.
Checks supplied preference-origin criteria and reports the applied threshold. Missing facts are returned as null and named in unavailable_fields where applicable. Derived values disclose their method; source-backed values disclose source, time window and age. This is neither legal advice nor customs advice.
The price is the seller’s own listing. it demanded payment when we knocked, on 2026-10-22.
Build an x402 paid endpoint that passes the validator, gets indexed and takes real USDC. End-to-end recipe for turning any HTTP capability into an x402 endpoint that an unknown agent can find, pay for and consume: the payment gate, the verifier rules, per-route pricing, the concurrency traps, the nginx wiring, the discovery surface, plus the money-path bugs we only found when real USDC moved. Comes with the exact commands we run.
The price is the seller’s own listing. it demanded payment when we knocked, on 2026-10-22.
Current Base base fee, suggested priority fees and USD cost estimates for a transfer or an ERC-20 transfer.
The price is the seller’s own listing. it demanded payment when we knocked, on 2026-10-22.
Domain & email audit — SPF, DMARC, DKIM, MX, TLS certificate, HSTS and security headers, scored 0-100
The price is the seller’s own listing. it demanded payment when we knocked, on 2026-10-22.
Shared risk exposure across declared positions: pass ?positions=aave:200000,morpho:150000 and get, per factor, how much capital sits behind the same collateral, oracle or curator, and via which venues. Morpho is attributed per isolated market, Compound by its real posted-collateral basket; Aave is unattributed because a v3 supplier is exposed to the whole pool, never split across assets. Verified per-asset accuracy is free at /accuracy.json; raw on-chain attestations at /track-record.
The price is the seller’s own listing. it demanded payment when we knocked, on 2026-10-22.
Shared risk exposure across declared WETH positions — same contract as the USDC exposure route. Pass ?positions=aave:100000,morpho:50000. Protocols whose collateral composition cannot be established are reported unattributed with the reason, never split across assets to imply diversification. Verified per-asset accuracy is free at /accuracy.json; raw on-chain attestations at /track-record.
The price is the seller’s own listing. it demanded payment when we knocked, on 2026-10-22.
How much of the WETH lending APY on Base survives if incentives stop — same contract as the USDC durability route, for WETH. Undecomposable sources are named, never assumed incentive-free. Stress test of current readings, not a date forecast. Verified per-asset accuracy is free at /accuracy.json; raw on-chain attestations at /track-record.
The price is the seller’s own listing. it demanded payment when we knocked, on 2026-10-22.
Trend insights for a topic, based on real Wikipedia page-view volume and momentum. Premium tier adds relatedTrends: other Wikipedia article titles matching the same search terms (title-similarity, not a curated semantic-relevance ranking). Not literal search/social trend data — see the response's `source` field.
The price is the seller’s own listing. it demanded payment when we knocked, on 2026-10-22.
Usage-based text generation, billed by output length (max $0.05/request)
The price is the seller’s own listing. it demanded payment when we knocked, on 2026-10-22.
Current gas price and EIP-1559 fee estimate for a chain (base, ethereum, polygon, arbitrum, optimism)
The price is the seller’s own listing. it demanded payment when we knocked, on 2026-10-22.
Compare 2 to 3 US-listed stocks side by side (peer or watchlist comparisons). Pass a comma-separated list via `?tickers=AAPL,MSFT,NVDA` (1 to 3 symbols). Returns price and day change, market cap, P/E, EPS, revenue, gross and net margins, and dividend yield per ticker. Built for multiple stocks — for a single stock, `/api/v1/quote/{ticker}` is cheaper. From x402stock
The price is the seller’s own listing. it demanded payment when we knocked, on 2026-10-22.
Current token prices by contract address or coingecko id, several at once. Accepts chain:address or coingecko:id
The price is the seller’s own listing. it demanded payment when we knocked, on 2026-10-22.
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.