{"id":"396c44d2-bf27-42f2-a76e-adde16a41453","shortId":"SNEUfR","kind":"x402","title":"Pay-per-call API platform on Base (USDC) via x402 — $0.02/request, no API keys required.","tagline":"Pay-per-call API platform on Base (USDC) via x402 — $0.02/request, no API keys required.","description":"lowpaymentfee.com is a pay-per-request API platform that uses the x402 protocol to accept USDC payments on the Base network. The specific endpoint `/api/v1/charges/184` is listed as \"Premium API Access\" and returns a 402 challenge requesting up to 20,000 base units of USDC (0.02 USD) per call. The platform advertises no API keys, no rate limits, and instant access — you simply attach an x402 payment header to each request.\n\nThe broader platform offers 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.\n\nDocumentation is extremely sparse — the /docs, /pricing, /api, 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 description of what the `/api/v1/charges/184` endpoint actually returns. The endpoint is live (402 challenge confirmed), but without documentation it is unclear what data or functionality \"Premium API Access\" provides.","tags":[],"capabilities":["x402-payment","usdc-base-network","pay-per-request","no-api-key","json-response"],"categories":["api-platform","infrastructure"],"synonyms":["x402 API","pay-per-call API","USDC API","Base network API","micropayment API","lowpaymentfee","low payment fee"],"warnings":["No documentation available — /docs, /pricing, /api, and /README pages all show only 'Connect wallet' with no content.","No OpenAPI or schema describing request parameters or response format for /api/v1/charges/184.","It is unclear what 'Premium API Access' at /api/v1/charges/184 actually provides — the endpoint name is generic.","The broader platform lists many endpoint categories (AI, finance, analytics, infrastructure) but none have documented schemas or examples."],"endpointUrl":"https://lowpaymentfee.com/api/v1/charges/184","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/charges/184","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.250","qualityRationale":"The endpoint is live and returns a valid x402 402 challenge, but there is virtually no documentation: no OpenAPI schema, no request/response examples, and no explanation of what 'Premium API Access' actually returns. The docs, pricing, API, and README pages are all blank beyond a wallet-connect prompt. This is effectively a stub 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'/api/v1/charges/184':60,192 '/docs':161 '/pricing':162 '/readme':165 '/request':13,30 '0.02':12,29,81,153 '000':76 '20':75 '402':70,200 'Base network API' 'USDC API' 'accept':50 'access':66,96,215 'across':112 'actual':194 'advertis':87 'ai':122 'analysi':126 'analyt':116 'api':5,15,22,32,42,65,89,214 'attach':99 'base':8,25,55,77 'broader':108 'call':4,21,84 'categori':114 'challeng':71,201 'classif':129 'confirm':202 'connect':171 'content':177 'convers':146 'data':115,119,210 'descript':188 'document':156,205 'embed':130 'endpoint':59,111,149,193,197 'estim':140 'exampl':185 'exchang':135 'export':120 'extrem':158 'feed':134 'financ':131 'four':113 'function':212 'gas':139 'generat':147 'geocod':144 'header':103 'infrastructur':142 'insight':121 'instant':95 'json-response' 'key':16,33,90 'learn':124 'limit':93 'list':62 'live':199 'low payment fee' 'lowpaymentfee' 'lowpaymentfee.com':35 'machin':123 'metric':117 'micropayment API' 'network':56 'no-api-key' 'offer':110 'openapi':181 'page':166 'pay':2,19,39 'pay-per-cal':1,18 'pay-per-call API' 'pay-per-request':38 'payment':52,102 'per':3,20,40,83,154 'platform':6,23,43,86,109 'premium':64,213 'price':133,151 'prompt':173 'protocol':48 'provid':216 'quot':138 'rate':92,136 'render':168 'report':118 'request':41,72,106,155 'request/response':184 'requir':17,34 'return':68,195 'schema':182 'sentiment':125 'simpli':98 'spars':159 'specif':58 'summar':128 'text':127 'token':137 'unclear':208 'unit':78 'usd':82 'usdc':9,26,51,80 'usdc-base-network' 'use':45 'util':143 'valid':145 'via':10,27 'wallet':172 'web3':132 'without':204 'x402':11,28,47,101 'x402 API' 'x402-payment'","prices":[{"id":"055a35c2-15ca-49f4-9d14-466818f9a314","listingId":"396c44d2-bf27-42f2-a76e-adde16a41453","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/charges/184","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:44:27.312Z"}],"sources":[{"listingId":"396c44d2-bf27-42f2-a76e-adde16a41453","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/charges/184","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:44:27.312Z","lastSeenAt":"2026-04-24T16:02:35.191Z"}],"details":{"listingId":"396c44d2-bf27-42f2-a76e-adde16a41453","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/charges/184 \\\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 requesting up to 20,000 base units of USDC (asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base network.","source_url":"https://lowpaymentfee.com/api/v1/charges/184"},{"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 endpoints in Data & Analytics, AI & Machine Learning, Finance & Web3, and Infrastructure categories.","source_url":"https://lowpaymentfee.com"},{"claim":"The /docs, /pricing, /api, and /README pages render only a 'Connect wallet' prompt with no further documentation.","source_url":"https://lowpaymentfee.com/docs"}],"useCases":["Accessing premium API data with per-request USDC micropayments on Base","Agent-driven API consumption without pre-registration or API keys","Programmatic pay-as-you-go access to analytics, AI, finance, or utility endpoints"],"bestFor":["Developers wanting zero-signup, pay-per-call API access","AI agents that can settle x402 payments autonomously","Users who prefer crypto micropayments over subscription billing"],"notFor":["Users who need detailed API documentation or OpenAPI specs before integrating","High-volume consumers who want bulk pricing or subscription discounts","Anyone without a Base-network USDC wallet"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:24.376Z"},"updatedAt":"2026-04-24T16:02:35.191Z"}}