{"id":"50300fb1-2d27-4a50-8e0a-9430fa6f8be4","shortId":"Wvgq7x","kind":"x402","title":"Pay-per-call API platform on Base network via x402 — $0.02/request in USDC.","tagline":"Pay-per-call API platform on Base network via x402 — $0.02/request in USDC.","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 at `/api/v1/payments/264` is labeled \"Premium API Access\" and accepts POST requests. The platform advertises a flat $0.02 per request across all its endpoints, with no API keys, no rate limits, and instant access.\n\nThe site lists 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 (geocoding, validation, conversion, generation). However, this specific endpoint (`/api/v1/payments/264`) is listed as \"Premium API Access\" and does not clearly map to any of those categories. The x402 challenge confirms a maxAmountRequired of 20000 base units of USDC (6 decimals), which equals $0.02.\n\nDocumentation is extremely sparse — the docs, API, pricing, and README pages all render only a \"Connect wallet\" prompt with no substantive content. There is no OpenAPI schema, no request/response examples, and no description of what this particular endpoint actually returns. The endpoint is live and responds with a valid x402 challenge, 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","http-post"],"categories":["api-gateway","payments"],"synonyms":["x402 API","pay-per-call API","USDC micropayment API","Base network API","lowpaymentfee","crypto API access"],"warnings":["No documentation available — docs, API, pricing, and README pages all show only 'Connect wallet' with no content","No OpenAPI or schema describing request parameters or response format","The purpose of '/api/v1/payments/264' ('Premium API Access') is not explained anywhere on the site","Cannot verify what data or functionality this endpoint actually provides"],"endpointUrl":"https://lowpaymentfee.com/api/v1/payments/264","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/payments/264","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.250","qualityRationale":"The endpoint is live with a valid x402 challenge, but there is no documentation, no OpenAPI schema, no request/response examples, and no clear description of what 'Premium API Access' actually returns. The docs pages are empty. This is effectively a stub 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'/request':13,28 '0.02':12,27,72,165 '20000':156 '6':161 'Base network API' 'USDC micropayment API' 'accept':46,64 'access':62,88,138,229 'across':75 'actual':204 'advertis':69 'ai':103 'analysi':107 'analyt':97 'api':5,20,38,61,81,95,137,172,228 'base':8,23,51,157 'call':4,19 'categori':93,148 'challeng':151,216 'classif':110 'clear':142 'confirm':152 'connect':181 'content':187 'convers':126 'crypto API access' 'data':96,100,224 'decim':162 'descript':198 'doc':171 'document':166,219 'embed':111 'endpoint':55,78,131,203,207 'equal':164 'estim':121 'exampl':195 'exchang':116 'export':101 'extrem':168 'feed':115 'financ':112 'flat':71 'four':92 'function':226 'gas':120 'generat':127 'geocod':124 'howev':128 'http-post' 'infrastructur':123 'insight':102 'instant':87 'key':82 'label':59 'learn':105 'limit':85 'list':91,134 'live':209 'lowpaymentfee' 'lowpaymentfee.com':31 'machin':104 'map':143 'maxamountrequir':154 'metric':98 'network':9,24,52 'no-api-key' 'openapi':191 'page':176 'particular':202 'pay':2,17,35 'pay-per-cal':1,16 'pay-per-call API' 'pay-per-request':34 'payment':48 'per':3,18,36,73 'platform':6,21,39,68 'post':65 'premium':60,136,227 'price':114,173 'prompt':183 'protocol':44 'provid':230 'quot':119 'rate':84,117 'readm':175 'render':178 'report':99 'request':37,66,74 'request/response':194 'respond':211 'return':205 'schema':192 'sentiment':106 'site':90 'spars':169 'specif':54,130 'substant':186 'summar':109 'text':108 'token':118 'unclear':222 'unit':158 'usdc':15,30,47,160 'usdc-base-network' 'use':41 'valid':125,214 'via':10,25 'wallet':182 'web3':113 'without':218 'x402':11,26,43,150,215 'x402 API' 'x402-payment'","prices":[{"id":"0cb70cbc-2b38-4c1d-8d32-5718e52ee7b8","listingId":"50300fb1-2d27-4a50-8e0a-9430fa6f8be4","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/payments/264","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:50:06.361Z"}],"sources":[{"listingId":"50300fb1-2d27-4a50-8e0a-9430fa6f8be4","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/payments/264","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:50:06.361Z","lastSeenAt":"2026-04-23T14:01:24.276Z"}],"details":{"listingId":"50300fb1-2d27-4a50-8e0a-9430fa6f8be4","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/payments/264 \\\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 valid x402 challenge with maxAmountRequired of 20000 base units of USDC on Base network","source_url":"https://lowpaymentfee.com/api/v1/payments/264"},{"claim":"The platform advertises $0.02/request pricing with no API keys, no rate limits, and instant access","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset contract on Base: 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/payments/264"},{"claim":"The site lists APIs across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"}],"useCases":["Accessing premium API data with per-request USDC micropayments","Agent-driven API consumption without pre-registration or API keys","Programmatic pay-as-you-go access to unspecified premium content"],"bestFor":["Developers wanting zero-signup API access via crypto micropayments","AI agents that can settle x402 payments on Base","Users who prefer pay-per-call over subscription models"],"notFor":["Users who need detailed API documentation before integrating","Anyone requiring fiat-only payment methods","High-volume consumers who need bulk pricing or rate guarantees"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:07.998Z"},"updatedAt":"2026-04-23T14:01:24.276Z"}}