Every agent-payable API.

Aggregated x402 ecosystem stats — total services, volume estimates, growth metrics. EXCLUSIVE to httpay.xyz.

Aggregated alpha signals for early opportunities (BSC only). (with AI analysis)

Agriculture Drought — an agent-callable agriculture drought service, payable over x402 (USDC on Base). Provided via 2s.io. Priced around 0.001 USD per call.

Agriculture Stats — an agent-callable agriculture stats service, payable over x402 (USDC on Base). Provided via 2s.io. Priced around 0.001 USD per call.

Alpha Vantage Inc. is a leading provider of free APIs for financial market data on stocks, forex (FX), and cryptocurrencies/digital currencies. | Powered by Questflow

Top signal providers on MQL5, ZuluTrade, Signal Start and Myfxbook AutoTrade — ranked by verified performance. For trading agents sourcing entry and exit signals.

Amazon product page fetch — title, price and details as they appear, via managed retrieval that handles bot protection and JavaScript rendering. For price tracking, product research and ecommerce data. amazon, product page, price tracking, ecommerce data, product research, retail, asin Accepts payment on Base or Solana — either network works.

An instructional module that showcases Hello World implementations in Python, JavaScript, and HTML/CSS, providing setup instructions, best practices, and interactive runnable code snippets for learners to explore multiple programming languages. | Powered by Questflow

An interactive Flappy Bird style game block with a cute bird character, click or spacebar to flap, navigate through pipes, track scores, and display game over. Ideal for personal or demo projects showcasing simple game mechanics. | Powered by Questflow

An interactive dashboard visualizing the 24‑hour trading volume of the top 10 cryptocurrencies. Features real‑time data refresh, line charts via Recharts, hover tooltips, responsive layout, and detailed data tables for comprehensive market analysis. | Powered by Questflow

Analyze — an agent-callable analyze service, payable over x402 (USDC on Base). Provided via Apify. Priced around 0.001 USD per call.

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 & metadata as clean JSON.

Apple App Store product details — full profile for a single app by product_id: rating, price, description, version history, screenshots & metadata as clean JSON.

Approval Assistant, can only process approval related tasks, only needed when approval requirement is clearly stated. | Powered by Questflow

Real-time at-risk DeFi borrowers across Aave V3, Morpho, Comet, Euler V2, Fluid, Moonwell, Spark on 11 EVM chains. Returns health factor, collateral, debt, and protocol. Updated every 5 minutes from the liquita liquidation engine.

Top 100 AI researchers ranked by AI publication volume in the trailing 365 days, enriched with h-index, i10-index, total citation count, primary affiliation (institution + country), ORCID, and derived AI-share-of-total. OpenAlex CC0. Daily refresh.

Car reliability / common problems / known issues lookup. Returns common problems, reliability analysis, and NHTSA owner-complaint patterns for any year/make/model, with owner-forum research. Worldwide. For car-buyer, used-car, and auto agents.

Used car value / vehicle market value / trade-in value estimate. Returns the current market value for any car by VIN or year/make/model, adjusted for mileage and condition, with a sell-vs-hold recommendation and trade-in context. For car-seller and auto agents.

Issuer control & trust profile for Base B20 native tokens. Detects holder-harm threats (honeypots, armed freeze-and-seize, live pause, fake B20s and ticker impersonation copycats) and separately discloses intended issuer controls: admin centralisation, supply cap, transfer policies and rebase

Base X profile mini-endpoint. Fetches a full X profile and the 10 most recent tweets for a given handle, returning the raw profile data plus a trimmed tweet list with key engagement metrics and media. Cost: 0.001 USDC per request.

Stay listed in this Bazaar: resources are delisted after ~30 days without a settled payment. $190 prepaid year, agent-payable (the card alternative is $19/mo at mudko.com/pricing): our funded wallet settles a small heartbeat to your endpoint twice a month - the USDC lands in YOUR payTo, so the heartbeat costs you nothing - we watch your merchant-feed entry weekly and alert + resurrect on any delisting. Requires an existing Bazaar Listing Package: pass the listing_key issued by https://mudko.com/api/x402/bazaar-listing.

Get YOUR x402 endpoint listed in this Bazaar - done for you, $99 one-time. You receive a deploy-ready x402 v2 kit generated for your stack (Next.js, Express, serverless; PHP via a free serverless function) with your wallet, price and discovery declaration baked in, plus a resumable listing_key that drives the automated pipeline via MCP (https://mudko.com/api/mcp): validate against Coinbase's own preflight with per-check fixes, and when your price is $1 or under WE fire the indexing settlement from our funded wallet. Ends with a receipt: settle tx + your live merchant-feed entry. Built by the team that listed its own endpoints first (this very listing is dogfood). Keepalive add-on available so you never fall out of the index.

Before your agent stores or messages a phone number: validate and normalize it offline — E.164 formatting, region, national format and line type from Google's libphonenumber metadata, no network call

Bio Gene — an agent-callable bio gene service, payable over x402 (USDC on Base). Provided via 2s.io. Priced around 0.00192 USD per call.

Endangered species deep-dive for conservation and naturalist agents. Returns IUCN Red List status, threats, and conservation actions for any species.

Invasive species alerts for conservation and naturalist agents. Returns threats, spread, control methods, and reporting channels for any region.

BitBooth echo endpoint — pays a tiny USDC fee, returns a JSON echo. Reference implementation of the x402 + CDP Facilitator + Bazaar discovery loop.

Bitcoin address balance + tx history. Returns confirmed BTC and sats balance, unconfirmed mempool delta, total received/spent, tx counts, up to 20 recent tx with timestamps and fees, address type (p2pkh p2sh p2wpkh p2tr). AI agent whale tracker, BTC wallet API, on-chain analytics.

Bitcoin block info by height or hash. Returns hash, height, timestamp, tx count, total fees, miner pool ID, size, weight, difficulty, merkle root, version, nonce, up to 100 tx IDs. AI agent BTC block explorer API, network state analysis, mining metrics.

Bitcoin mempool stats real-time. Unconfirmed tx count, total vsize MB, fee histogram, avg sat/vByte, current tip height, next difficulty adjustment estimate with progress %, remaining blocks, avg block time. AI agent BTC timing bot, mempool API, network congestion data.

Bitcoin recommended fees real-time from mempool. sat/vByte tiers: fastest, half-hour, hour, economy, minimum. Includes mempool tx count, total size MB, total fee sats, fee histogram. AI agent BTC broadcasting bot, fee estimator API, mempool monitor.

Bitcoin spot price in USD. Pay-per-call $0.001 USDC. AI agent BTC price feed.

Bittensor Models — an agent-callable bittensor models service, payable over x402 (USDC on Base). Provided via gateway.spraay.app. Priced around 0.001 USD per call.

CoinStats list of supported wallet blockchains and their connectionId identifiers

Paid book chapter (x402): Automate the Boring Stuff with Python: What Is Programming. Unit of a larger practical-skills library; free catalog at /library/discovery.json. Book slug: automatetheboringstuffwithpythonnew. Response format: Markdown (.md) for agent parsing. USDC on Base via Coinbase CDP facilitator. Free teasers and discovery.json require no payment.

Boost collaboration and version control in your development process with the Github app, a dynamic connector that integrates Github's features into your web2 and web3 workflows. | Powered by Questflow

Complete parcel intelligence: owner, situs, assessed value, classification, property tax and tax-sale (delinquency) status, full sale history and deeds, census tract, CDBG low/mod status, and every qualifying funding program with its cited rule.

Materials takeoff for contractor and homeowner agents. Returns a complete list with quantities, current pricing, and sourcing links for any project.

Bulk market snapshots via Tokens API (Base/EVM)

Buy $5 USDC of x420 token

Buy 5 USDC worth of x420 tokens 0x68e284F21D04D4D62398C290EC3EF41C97F80b07

Buy 50 TOM (experience tier) for 0.01 USDC on Base.

Calendar Ipo — an agent-callable calendar ipo service, payable over x402 (USDC on Base). Provided via 2s.io. Priced around 0.001 USD per call.

Can perform deep search on the web using Google Gemini model. | Powered by Questflow

Can send email using no-reply@questflow.ai other mail address. | Powered by Questflow

Returns the 4 top-level product categories (market intelligence, workflows, media generation, infrastructure) with endpoint lists and service counts — use it to route discovery before browsing individual services.

Census Demographics — an agent-callable census demographics service, payable over x402 (USDC on Base). Provided via 2s.io. Priced around 0.00108 USD per call.

Mid-market reference rates for one base currency against all published currencies, from the European Central Bank.

Country lookup by name, ISO code, or calling code.