{"id":"7743716c-8574-4291-ac5d-5bfc99b517d7","shortId":"ZWTkcp","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/93` is listed as \"Premium API Access\" and accepts POST requests with payment via the x402 exact scheme. The maximum amount required is 20,000 base units of USDC (0x8335…), which equals $0.02 per call (USDC uses 6 decimals).\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 $0.02 per request with no API keys, no rate limits, and no minimum commitments.\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 available from the crawl. The endpoint is confirmed live (returns a proper 402 challenge), but without documentation it is unclear what request body `/api/v1/products/93` expects or what response payload it returns.","tags":[],"capabilities":["x402-payment","usdc-micropayment","base-network","per-request-billing","no-api-key","post-endpoint","json-response"],"categories":["api-marketplace","misc"],"synonyms":["low payment fee","x402 api","micropayment api","pay-per-request api","base usdc api","lowpaymentfee"],"warnings":["No API documentation available — /docs, /api, /pricing, and /README pages all show only 'Connect wallet'","No OpenAPI or JSON schema describing request body or response format for this endpoint","The specific purpose of /api/v1/products/93 ('Premium API Access') is not explained anywhere in the crawled content","Cannot verify what data or service this endpoint actually returns"],"endpointUrl":"https://lowpaymentfee.com/api/v1/products/93","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/93","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. However, 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 /products/93 endpoint is unclear beyond the generic 'Premium API Access' 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'/api/v1/products/93':66,222 '/docs':170 '/pricing':172 '/readme':174 '/request':17,34 '0.02':16,33,98,151 '000':90 '0x8335':95 '20':89 '402':211 '6':103 'accept':74 'access':44,72 'advertis':108 'ai':10,27,120 'amount':86 'analysi':124 'analyt':114 'api':4,21,40,71,112,156 'avail':199 'base':7,24,60,91 'base usdc api' 'base-network' 'behind':50 'bodi':221 'broader':106 'call':100 'categori':110 'challeng':212 'classif':127 'commit':164 'confirm':206 'connect':180 'content':186 'convers':144 'crawl':202 'data':9,26,113,117 'decim':104 'detail':197 'document':165,198,215 'embed':128 'endpoint':14,31,49,64,147,204 'equal':97 'estim':138 'exact':82 'exampl':194 'exchang':133 'expect':223 'export':118 'extrem':167 'feed':132 'financ':11,28,129 'four':109 'gas':137 'gate':3,20,43 'generat':145 'geocod':142 'infrastructur':140 'insight':119 'json-response' 'key':157 'learn':122 'limit':160 'list':68,149 'live':207 'low payment fee' 'lowpaymentfee' 'lowpaymentfee.com':35 'machin':121 'marketplac':41 'maximum':85 'metric':115 'micropay':54 'micropayment api' 'minimum':163 'network':61 'no-api-key' 'offer':8,25 'openapi':190 'page':175 'pay-per-request api' 'payload':227 'payment':78 'per':52,99,152 'per-request':51 'per-request-billing' 'platform':5,22,107 'post':75 'post-endpoint' 'premium':70 'price':131 'prompt':182 'proper':210 'protocol':39 'quot':136 'rate':134,159 'render':177 'report':116 'request':53,76,153,220 'request/response':193 'requir':87 'respons':226 'return':208,229 'schema':191 'scheme':83 'sentiment':123 'settl':55 'spars':168 'specif':63 'summar':126 'text':125 'token':135 'unclear':218 'unit':92 'usdc':57,94,101 'usdc-micropayment' 'use':102 'util':13,30,141 'valid':143 'varieti':47 'via':79 'wallet':181 'web3':130 'without':214 'x402':2,19,38,81 'x402 api' 'x402-gated':1,18 'x402-payment'","prices":[{"id":"f707a731-8198-4e63-8942-64364a7c743b","listingId":"7743716c-8574-4291-ac5d-5bfc99b517d7","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/93","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:34:12.518Z"}],"sources":[{"listingId":"7743716c-8574-4291-ac5d-5bfc99b517d7","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/products/93","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:34:12.518Z","lastSeenAt":"2026-04-22T13:30:22.306Z"}],"details":{"listingId":"7743716c-8574-4291-ac5d-5bfc99b517d7","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/products/93 \\\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 with maxAmountRequired of 20000 base units of USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/products/93"},{"claim":"All endpoints are priced at $0.02 per request with no API keys, no rate limits, and instant access","source_url":"https://lowpaymentfee.com"},{"claim":"The platform offers APIs in Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset address is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base network","source_url":"https://lowpaymentfee.com/api/v1/products/93"}],"useCases":["Accessing premium API data with per-call USDC micropayments on Base","Agent-driven API consumption without pre-registration or API keys","Programmatic access to data, AI, finance, or utility services via x402"],"bestFor":["Developers wanting zero-commitment pay-per-use API access","AI agents that can settle x402 payments autonomously on Base","Users who prefer crypto micropayments over subscription billing"],"notFor":["Users needing detailed API documentation or OpenAPI specs before integrating","High-volume consumers who need bulk pricing or rate-limit guarantees","Anyone without a Base-compatible USDC wallet"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-27T18:02:27.811Z"},"updatedAt":"2026-04-22T13:30:22.306Z"}}