{"id":"32a3725b-bd25-4759-86e7-70542cde47d3","shortId":"WJBKRA","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-enabled API platform that exposes a collection of endpoints across four categories: 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 and settle in USDC on the Base network.\n\nThe specific endpoint at `/api/v1/carts/87` is listed as \"Premium API Access\" and returns a valid x402 challenge with a maxAmountRequired of 20,000 base units of USDC (0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base, 6 decimals), which equals $0.02. Payment is made via the x402 exact scheme — no API keys, subscriptions, or rate limits are advertised. The endpoint accepts POST requests and returns application/json.\n\nDocumentation is extremely sparse: the docs, API, pricing, and README pages all render only a \"Connect wallet\" prompt with no further content. There is no OpenAPI schema, no request/response examples, and no detailed documentation for what the `/api/v1/carts/87` endpoint actually returns or what input it expects. The platform appears to be a demonstration or early-stage x402 marketplace rather than a mature, well-documented API provider.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","pay-per-request","json-response","post-method","no-api-key"],"categories":["api-marketplace","crypto"],"synonyms":["low payment fee","x402 api","pay per call api","usdc api","base network api","micropayment api","402 payment required"],"warnings":["No OpenAPI or schema documentation available for this endpoint","All doc/pricing/API pages render only 'Connect wallet' with no usable content","The specific endpoint /api/v1/carts/87 ('Premium API Access') does not appear in the site's listed API catalog — its purpose is unknown","No request body schema or response examples are available anywhere"],"endpointUrl":"https://lowpaymentfee.com/api/v1/carts/87","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/87","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 challenge, but there is no OpenAPI schema, no request/response examples, and all documentation pages are empty beyond a wallet-connect prompt. The purpose of the specific /api/v1/carts/87 endpoint is unclear. Effectively a stub 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'/request':17,34 '0.02':16,33,90,135 '000':123 '0x833589fcd6edb6e08f4c7c32d4f71b54bda02913':128 '20':122 '402 payment required' '6':131 'accept':155 'access':111 'across':49 'actual':200 'advertis':152 'ai':10,27,59 'analysi':63 'analyt':53 'api':4,21,41,110,145,167,227 'appear':209 'application/json':160 'base':7,24,99,124,130 'base network api' 'base-network' 'categori':51 'challeng':117 'classif':66 'collect':46 'connect':176 'content':182 'convers':83 'data':9,26,52,56 'decim':132 'demonstr':213 'detail':193 'doc':166 'document':161,194,226 'earli':216 'early-stag':215 'embed':67 'enabl':40 'endpoint':14,31,48,86,103,154,199 'equal':134 'estim':77 'exact':142 'exampl':190 'exchang':72 'expect':206 'export':57 'expos':44 'extrem':163 'feed':71 'financ':11,28,68 'four':50 'gas':76 'gate':3,20 'generat':84 'geocod':81 'infrastructur':79 'input':204 'insight':58 'json-response' 'key':146 'learn':61 'limit':150 'list':107 'low payment fee' 'lowpaymentfee.com':35 'machin':60 'made':138 'marketplac':219 'matur':223 'maxamountrequir':120 'metric':54 'micropayment api' 'network':100 'no-api-key' 'offer':8,25 'openapi':186 'page':171 'pay per call api' 'pay-per-request' 'payment':136 'per':91 'platform':5,22,42,208 'post':156 'post-method' 'premium':109 'price':70,88,168 'prompt':178 'provid':228 'quot':75 'rate':73,149 'rather':220 'readm':170 'render':173 'report':55 'request':92,157 'request/response':189 'return':113,159,201 'schema':187 'scheme':143 'sentiment':62 'settl':94 'spars':164 'specif':102 'stage':217 'subscript':147 'summar':65 'text':64 'token':74 'unit':125 'usdc':96,127 'usdc api' 'usdc-settlement' 'util':13,30,80 'valid':82,115 'via':139 'wallet':177 'web3':69 'well':225 'well-docu':224 'x402':2,19,39,116,141,218 'x402 api' 'x402-enabled':38 'x402-gated':1,18 'x402-payment'","prices":[{"id":"85ac53c9-9965-4eb4-a451-13adeac06838","listingId":"32a3725b-bd25-4759-86e7-70542cde47d3","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/87","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:38:47.747Z"}],"sources":[{"listingId":"32a3725b-bd25-4759-86e7-70542cde47d3","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/carts/87","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:38:47.747Z","lastSeenAt":"2026-04-23T09:00:47.293Z"}],"details":{"listingId":"32a3725b-bd25-4759-86e7-70542cde47d3","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/carts/87 \\\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":"All listed endpoints are priced at $0.02 per request with no minimums or commitments","source_url":"https://lowpaymentfee.com"},{"claim":"Endpoints settle in USDC on the Base network with no API keys or rate limits","source_url":"https://lowpaymentfee.com"},{"claim":"The x402 challenge for /api/v1/carts/87 specifies maxAmountRequired of 20000 base units of USDC (asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913)","source_url":"https://lowpaymentfee.com/api/v1/carts/87"},{"claim":"Categories include Data & Analytics, AI & Machine Learning, Finance & Web3, and Infrastructure","source_url":"https://lowpaymentfee.com"}],"useCases":["Paying per-call for lightweight API access without managing API keys or subscriptions","Integrating x402-compatible agents with a low-cost endpoint for testing payment flows","Accessing data, AI, finance, or utility services via crypto micropayments"],"bestFor":["Developers experimenting with x402 payment protocol integrations","Agents that need keyless, pay-per-request API access on Base","Low-volume or sporadic API consumers who want no commitments"],"notFor":["Production workloads requiring detailed API documentation and SLAs","Users who need non-crypto (fiat) payment methods","High-throughput applications where per-request crypto settlement adds latency"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:40.738Z"},"updatedAt":"2026-04-23T09:00:47.293Z"}}