{"id":"032420fe-c797-43fb-a7ef-3296eb00ca06","shortId":"9Sn8yT","kind":"x402","title":"x402-gated API platform on Base offering data, AI, finance, and utility endpoints at $0.02/request.","tagline":"x402-gated API platform on Base offering data, AI, finance, and utility endpoints at $0.02/request.","description":"lowpaymentfee.com is an x402 protocol API marketplace that gates access to a variety of endpoints behind per-request micropayments settled in USDC on the Base network. The specific endpoint at `/api/v1/carts/67` is listed as \"Premium API Access\" and requires a maximum payment of 20,000 base units of USDC (0.02 USD, since USDC uses 6 decimals) per call via the x402 exact payment scheme.\n\nThe platform advertises four categories of APIs: Data & Analytics (metrics, reports, data export, insights), AI & Machine Learning (sentiment analysis, text summarization, classification, embeddings), Finance & Web3 (price feeds, exchange rates, token quotes, gas estimates), and Infrastructure utilities (geocoding, validation, conversion, generation). All endpoints are priced at $0.02 per request with no API keys, no rate limits, and no minimum commitments required.\n\nThe specific `/api/v1/carts/67` endpoint accepts POST requests and returns `application/json`. However, the crawled documentation pages (docs, api, pricing, README) all returned only a \"Connect wallet\" prompt with no substantive content, so the actual request/response schemas for this endpoint are unknown. There is no OpenAPI spec or detailed documentation available to clarify what data this particular cart endpoint returns or what input it expects.","tags":[],"capabilities":["x402-payment","usdc-base","per-request-micropayment","json-api","post-method","no-api-key","no-rate-limit"],"categories":["api-marketplace","infrastructure"],"synonyms":["low payment fee","x402 api","micropayment api","pay-per-request api","base network api","usdc api access","402 payment api"],"warnings":["No OpenAPI specification or machine-readable schema available","All documentation pages (docs, api, pricing, README) return only a 'Connect wallet' prompt with no content","The specific purpose of /api/v1/carts/67 ('Premium API Access') is unclear — it does not match any of the advertised API categories","Request and response body formats are entirely unknown"],"endpointUrl":"https://lowpaymentfee.com/api/v1/carts/67","protocol":"x402","transport":"http","auth":{"type":"x402","details":[{"asset":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","extra":{"name":"USD Coin","version":"2"},"payTo":"0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3","scheme":"exact","network":"base","mimeType":"application/json","resource":"https://lowpaymentfee.com/api/v1/carts/67","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.350","qualityRationale":"The endpoint is live and returns a valid x402 402 challenge, confirming it works. However, there is no OpenAPI spec, no documentation beyond a wallet-connect prompt, and no information about what the /api/v1/carts/67 endpoint actually returns. The request and response schemas are completely 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'/request':17,34 '0.02':16,33,85,145 '000':80 '20':79 '402 payment api' '6':90 'accept':164 'access':44,72 'actual':192 'advertis':102 'ai':10,27,114 'analysi':118 'analyt':108 'api':4,21,40,71,106,150,176 'application/json':169 'avail':208 'base':7,24,60,81 'base network api' 'behind':50 'call':93 'cart':215 'categori':104 'clarifi':210 'classif':121 'commit':158 'connect':183 'content':189 'convers':138 'crawl':172 'data':9,26,107,111,212 'decim':91 'detail':206 'doc':175 'document':173,207 'embed':122 'endpoint':14,31,49,64,141,163,197,216 'estim':132 'exact':97 'exchang':127 'expect':222 'export':112 'feed':126 'financ':11,28,123 'four':103 'gas':131 'gate':3,20,43 'generat':139 'geocod':136 'howev':170 'infrastructur':134 'input':220 'insight':113 'json-api' 'key':151 'learn':116 'limit':154 'list':68 'low payment fee' 'lowpaymentfee.com':35 'machin':115 'marketplac':41 'maximum':76 'metric':109 'micropay':54 'micropayment api' 'minimum':157 'network':61 'no-api-key' 'no-rate-limit' 'offer':8,25 'openapi':203 'page':174 'particular':214 'pay-per-request api' 'payment':77,98 'per':52,92,146 'per-request':51 'per-request-micropayment' 'platform':5,22,101 'post':165 'post-method' 'premium':70 'price':125,143,177 'prompt':185 'protocol':39 'quot':130 'rate':128,153 'readm':178 'report':110 'request':53,147,166 'request/response':193 'requir':74,159 'return':168,180,217 'schema':194 'scheme':99 'sentiment':117 'settl':55 'sinc':87 'spec':204 'specif':63,161 'substant':188 'summar':120 'text':119 'token':129 'unit':82 'unknown':199 'usd':86 'usdc':57,84,88 'usdc api access' 'usdc-base' 'use':89 'util':13,30,135 'valid':137 'varieti':47 'via':94 'wallet':184 'web3':124 'x402':2,19,38,96 'x402 api' 'x402-gated':1,18 'x402-payment'","prices":[{"id":"ee4d6d0c-1cb1-4b5a-820c-bef05141596d","listingId":"032420fe-c797-43fb-a7ef-3296eb00ca06","amountUsd":null,"unit":"per_call","nativeCurrency":"USD COIN","nativeAmount":"20000","chain":"base","payTo":"0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3","paymentMethod":"x402-usd coin","isPrimary":true,"details":{"scheme":"exact","mime_type":"application/json","accepts_all":[{"asset":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","extra":{"name":"USD Coin","version":"2"},"payTo":"0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3","scheme":"exact","network":"base","mimeType":"application/json","resource":"https://lowpaymentfee.com/api/v1/carts/67","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:36:19.108Z"}],"sources":[{"listingId":"032420fe-c797-43fb-a7ef-3296eb00ca06","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/carts/67","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:36:19.108Z","lastSeenAt":"2026-04-23T15:00:44.695Z"}],"details":{"listingId":"032420fe-c797-43fb-a7ef-3296eb00ca06","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/carts/67 \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402-payment-token>\"","exampleRequest":null,"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"The endpoint returns a 402 challenge requiring USDC payment of 20,000 base units (0.02 USD) on Base network","source_url":"https://lowpaymentfee.com/api/v1/carts/67"},{"claim":"The platform advertises APIs across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories, all at $0.02/request","source_url":"https://lowpaymentfee.com"},{"claim":"No API keys, no rate limits, instant access, Base network settlement","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset contract on Base: 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/carts/67"}],"useCases":["Accessing premium API data without subscription commitments","Making per-request micropayments for AI inference or data analytics","Paying for utility services like geocoding or validation on a per-call basis","Integrating crypto-native pay-as-you-go APIs into agent workflows"],"bestFor":["Developers wanting zero-commitment pay-per-use API access","AI agents that can settle x402 payments autonomously on Base","Projects needing low-cost micropayment-gated endpoints"],"notFor":["Users who need detailed API documentation or OpenAPI specs before integrating","Applications requiring high-throughput bulk access with negotiated pricing","Developers without USDC on Base network"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:48.211Z"},"updatedAt":"2026-04-23T15:00:44.695Z"}}