{"id":"e73296a6-41a7-4201-9f7d-6a2da59f0745","shortId":"B2C4kF","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/products/78` is listed as \"Premium API Access\" and returns a 402 challenge requiring payment of up to 20,000 base units of USDC (i.e., $0.02) per request. No API keys or rate limits are required; callers simply attach an X-PAYMENT header with a valid x402 payment proof.\n\nThe broader 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 listed at the same $0.02/request price point. The endpoint accepts POST requests and returns application/json responses.\n\nDocumentation beyond the landing page is extremely sparse — the /docs, /api, /pricing, and /README pages all render only a \"Connect wallet\" prompt with no additional technical detail. There is no OpenAPI spec, no request/response schema documentation, and no usage examples available from the crawl. The specific functionality behind the `/api/v1/products/78` path is unclear; it may be a generic product lookup or a meta-endpoint. Without further documentation, the exact input parameters and response structure cannot be determined.","tags":[],"capabilities":["x402-payment","usdc-base","per-request-micropayment","json-api","post-method","no-api-key","no-rate-limit"],"categories":["api-marketplace","data","llm","finance","infrastructure"],"synonyms":["lowpaymentfee","low payment fee API","x402 API marketplace","micropayment API","pay-per-request API","Base USDC API","402 payment API"],"warnings":["No OpenAPI or schema documentation available — request parameters and response format are unknown","All documentation pages (/docs, /api, /pricing, /README) render only 'Connect wallet' with no content","The specific functionality of /api/v1/products/78 ('Premium API Access') is not described anywhere","Cannot verify that the advertised AI, finance, and data endpoints actually function as described"],"endpointUrl":"https://lowpaymentfee.com/api/v1/products/78","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/products/78","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 with clear pricing, but there is no OpenAPI spec, no request/response schema, and all documentation pages are empty beyond a wallet-connect prompt. The specific purpose of /api/v1/products/78 is unclear. Effectively a stub 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'/api/v1/products/78':67,226 '/docs':186 '/pricing':188 '/readme':190 '/request':17,34,165 '0.02':16,33,91,164 '000':85 '20':84 '402':77 '402 payment API' 'Base USDC API' 'accept':170 'access':45,73 'addit':201 'advertis':119 'ai':10,27,131 'analysi':135 'analyt':125 'api':4,21,41,72,95,123 'application/json':175 'attach':104 'avail':217 'base':7,24,61,86 'behind':51,224 'beyond':178 'broader':117 'caller':102 'cannot':252 'categori':121 'challeng':78 'classif':138 'connect':196 'convers':155 'crawl':220 'data':9,26,124,128 'detail':203 'determin':254 'document':177,212,244 'embed':139 'endpoint':14,31,50,65,158,169,241 'estim':149 'exact':246 'exampl':216 'exchang':144 'export':129 'extrem':183 'feed':143 'financ':11,28,140 'four':120 'function':223 'gas':148 'gate':3,20,44 'generat':156 'generic':234 'geocod':153 'header':109 'i.e':90 'infrastructur':151 'input':247 'insight':130 'json-api' 'key':96 'land':180 'learn':133 'limit':99 'list':69,160 'lookup':236 'low payment fee API' 'lowpaymentfee' 'lowpaymentfee.com':35 'machin':132 'marketplac':42 'may':231 'meta':240 'meta-endpoint':239 'metric':126 'micropay':55 'micropayment API' 'network':62 'no-api-key' 'no-rate-limit' 'offer':8,25 'openapi':207 'page':181,191 'paramet':248 'path':227 'pay-per-request API' 'payment':80,108,114 'per':53,92 'per-request':52 'per-request-micropayment' 'platform':5,22,118 'point':167 'post':171 'post-method' 'premium':71 'price':142,166 'product':235 'prompt':198 'proof':115 'protocol':40 'quot':147 'rate':98,145 'render':193 'report':127 'request':54,93,172 'request/response':210 'requir':79,101 'respons':176,250 'return':75,174 'schema':211 'sentiment':134 'settl':56 'simpli':103 'spars':184 'spec':208 'specif':64,222 'structur':251 'summar':137 'technic':202 'text':136 'token':146 'unclear':229 'unit':87 'usag':215 'usdc':58,89 'usdc-base' 'util':13,30,152 'valid':112,154 'varieti':48 'wallet':197 'web3':141 'without':242 'x':107 'x-payment':106 'x402':2,19,39,113 'x402 API marketplace' 'x402-gated':1,18 'x402-payment' 'x402-protocol':38","prices":[{"id":"9d93b721-6972-492b-9918-15fc357377e1","listingId":"e73296a6-41a7-4201-9f7d-6a2da59f0745","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/products/78","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:35:13.243Z"}],"sources":[{"listingId":"e73296a6-41a7-4201-9f7d-6a2da59f0745","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/products/78","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:35:13.243Z","lastSeenAt":"2026-04-23T19:00:37.643Z"}],"details":{"listingId":"e73296a6-41a7-4201-9f7d-6a2da59f0745","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/products/78 \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402-payment-proof>\"","exampleRequest":null,"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"The endpoint returns a 402 challenge with maxAmountRequired of 20000 base units of USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/products/78"},{"claim":"USDC asset contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/products/78"},{"claim":"Platform advertises $0.02/request pricing with no API keys, no rate limits, and instant access","source_url":"https://lowpaymentfee.com"},{"claim":"Four API categories are listed: Data & Analytics, AI & Machine Learning, Finance & Web3, Infrastructure","source_url":"https://lowpaymentfee.com"},{"claim":"Documentation pages render only a 'Connect wallet' prompt with no technical content","source_url":"https://lowpaymentfee.com/docs"}],"useCases":["Accessing data analytics and reporting endpoints without subscription commitments","Running AI inference tasks (sentiment, summarization, classification, embeddings) on a pay-per-call basis","Fetching real-time crypto and finance data (prices, exchange rates, gas estimates)","Using utility services like geocoding, validation, and data conversion"],"bestFor":["Agents or developers who want pay-per-use API access without API key management","Low-volume or bursty workloads where subscription pricing is wasteful","x402-compatible AI agents that can autonomously pay for API calls on Base"],"notFor":["High-volume production workloads where per-request pricing adds up quickly","Users who need detailed API documentation, SDKs, or guaranteed SLAs","Anyone without a Base-compatible USDC wallet or x402 payment capability"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:51.423Z"},"updatedAt":"2026-04-23T19:00:37.643Z"}}