Every agent-payable API.

Airport Lookup — an agent-callable airport lookup 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

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.

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.

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.

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.

Kronos by ForgeMesh outcome audit for a prior decision_id. Compares recorded market context with later realized prices and returns a verdict, realized percentage change, and direction-correct result.

Bank Lookup — an agent-callable bank lookup service, payable over x402 (USDC on Base). Provided via 2s.io. Priced around 0.0012 USD per call.

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.

Best H200 — an agent-callable best h200 service, payable over x402 (USDC on Base). Provided via Apify. Priced around 0.05 USD per call.

Best Usdc — an agent-callable best usdc service, payable over x402 (USDC on Base). Provided via Apify. Priced around 0.05 USD per call.

Best Usdt — an agent-callable best usdt service, payable over x402 (USDC on Base). Provided via Apify. Priced around 0.05 USD per call.

Bio Protein — an agent-callable bio protein service, payable over x402 (USDC on Base). Provided via 2s.io. Priced around 0.00144 USD per call.

Bio Species — an agent-callable bio species service, payable over x402 (USDC on Base). Provided via 2s.io. Priced around 0.00144 USD per call.

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

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 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.

Books for a subject from Open Library, no key. Returns works tagged with the subject plus counts. For AI agents discovering books by topic.

Browse — an agent-callable browse service, payable over x402 (USDC on Base). Provided via Apify. Priced around 0.146904 USD per call.

Btc Latest — an agent-callable btc latest service, payable over x402 (USDC on Base). Provided via Apify. Priced around 0.0034 USD per call.

Btc Usd — an agent-callable btc usd service, payable over x402 (USDC on Base). Provided via Apify. Priced around 0.05 USD per call.

Btc Usd — an agent-callable btc usd service, payable over x402 (USDC on Base). Provided via Apify. Priced around 0.03 USD per call.

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.

Business No Companies — an agent-callable business no companies service, payable over x402 (USDC on Base). Provided via 2s.io. Priced around 0.00144 USD per call.

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.

Buy Basil — an agent-callable buy basil service, payable over x402 (USDC on Base). Provided via underground.substratesymposium.com. Priced around 0.99 USD per call.

Buy Haworthia — an agent-callable buy haworthia service, payable over x402 (USDC on Base). Provided via underground.substratesymposium.com. Priced around 0.99 USD per call.

Buy Imposter Syndrome Cortado — an agent-callable buy imposter syndrome cortado service, payable over x402 (USDC on Base). Provided via underground.substratesymposium.com. Priced around 1.99 USD per call.

Buy Lithops — an agent-callable buy lithops service, payable over x402 (USDC on Base). Provided via underground.substratesymposium.com. Priced around 0.99 USD per call.

Buy Neural Nets — an agent-callable buy neural nets service, payable over x402 (USDC on Base). Provided via underground.substratesymposium.com. Priced around 1.99 USD per call.

Buy Sedum — an agent-callable buy sedum service, payable over x402 (USDC on Base). Provided via underground.substratesymposium.com. Priced around 0.99 USD per call.

Buy Shots Of Courage — an agent-callable buy shots of courage service, payable over x402 (USDC on Base). Provided via underground.substratesymposium.com. Priced around 1.99 USD per call.

Buy Thyme — an agent-callable buy thyme service, payable over x402 (USDC on Base). Provided via underground.substratesymposium.com. Priced around 0.99 USD per call.

Salary benchmarking for job-seeker and career-coach agents. Returns real compensation data by role, location, and experience level.

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.

Chain Chain Id — an agent-callable chain chain id service, payable over x402 (USDC on Base). Provided via x402-agent-store.rileycraig14.workers.dev. Priced around 0.001 USD per call.

Cheap connectivity-check endpoint. Verifies the full x402 settlement path (signature -> CDP facilitator -> on-chain transferWithAuthorization) for $0.01 so AI agents can validate wallet + network + facilitator wiring before committing to higher-value AML calls.

ChainQuery Bitcoin Intelligence: independent Bitcoin-native on-chain data over x402, no API key. Top 10 addresses by balance from the weekly UTXO-set snapshot, with labels.

ChainQuery Bitcoin Intelligence: independent Bitcoin-native on-chain data over x402, no API key. Full HODL-waves history: supply split across 12 age bands per weekly snapshot.

Cheapest — an agent-callable cheapest service, payable over x402 (USDC on Base). Provided via costpulse.waltsoft.net. Priced around 0.01 USD per call.

Check if we've hit the bottom

Check the ERC20 allowance an owner has granted a spender, returns raw and formatted amount with token symbol and decimals on five EVM chains. token allowance, erc20 approval check, spender allowance, approval audit, revoke helper data