{"id":"c20a54fe-1db6-49a6-ace5-490a8570013c","shortId":"5BmkeG","kind":"x402","title":"Pay-per-call API platform on Base network via x402 — $0.02/request, no API keys required.","tagline":"Pay-per-call API platform on Base network 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 at `/api/v1/payments/9` is labeled \"Premium API Access\" and returns a 402 challenge requesting up to 20,000 base units of USDC (i.e., $0.02) 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 listed at $0.02 per request.\n\nHowever, the specific endpoint `/api/v1/payments/9` does not clearly map to any of the documented API categories. Its description is simply \"Premium API Access\" with no further documentation on what data or functionality it returns. The docs, pricing, and API pages on the site are essentially empty (showing only a \"Connect wallet\" prompt), so there is no OpenAPI schema, request/response examples, or detailed documentation available for any endpoint.","tags":[],"capabilities":["x402-payment","usdc-base-network","pay-per-request","no-api-key","http-post"],"categories":["api-platform","payments"],"synonyms":["x402 API","pay-per-call API","USDC micropayment API","Base network API","lowpaymentfee","low payment fee API","402 payment protocol"],"warnings":["The endpoint path /api/v1/payments/9 does not correspond to any documented API category on the site — its actual functionality is unknown.","All documentation pages (docs, pricing, API, README) return only a 'Connect wallet' prompt with no substantive content.","No OpenAPI schema, request body schema, or response schema is available.","No example requests or responses are documented anywhere."],"endpointUrl":"https://lowpaymentfee.com/api/v1/payments/9","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/9","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.300","qualityRationale":"The endpoint is live and returns a valid x402 402 challenge, confirming it accepts USDC on Base at $0.02/request. However, there is no documentation, no OpenAPI schema, no request/response examples, and the specific endpoint's purpose ('Premium API Access') is undefined beyond its label. The docs/pricing/API pages are empty 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'/request':13,30 '0.02':12,29,82,153 '000':76 '20':75 '402':70 '402 payment protocol' 'Base network API' 'USDC micropayment API' 'accept':50 'access':66,96,178 'across':112 'advertis':87 'ai':122 'analysi':126 'analyt':116 'api':5,15,22,32,42,65,89,170,177,194 'attach':99 'avail':219 'base':8,25,55,77 'broader':108 'call':4,21,84 'categori':114,171 'challeng':71 'classif':129 'clear':163 'connect':205 'convers':146 'data':115,119,185 'descript':173 'detail':217 'doc':191 'document':169,182,218 'embed':130 'empti':201 'endpoint':59,111,149,159,222 'essenti':200 'estim':140 'exampl':215 'exchang':135 'export':120 'feed':134 'financ':131 'four':113 'function':187 'gas':139 'generat':147 'geocod':144 'header':103 'howev':156 'http-post' 'i.e':81 'infrastructur':142 'insight':121 'instant':95 'key':16,33,90 'label':63 'learn':124 'limit':93 'list':151 'low payment fee API' 'lowpaymentfee' 'lowpaymentfee.com':35 'machin':123 'map':164 'metric':117 'network':9,26,56 'no-api-key' 'offer':110 'openapi':212 'page':195 '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':64,176 'price':133,192 'prompt':207 'protocol':48 'quot':138 'rate':92,136 'report':118 'request':41,72,106,155 'request/response':214 'requir':17,34 'return':68,189 'schema':213 'sentiment':125 'show':202 'simpli':98,175 'site':198 'specif':58,158 'summar':128 'text':127 'token':137 'unit':78 'usdc':51,80 'usdc-base-network' 'use':45 'util':143 'valid':145 'via':10,27 'wallet':206 'web3':132 'x402':11,28,47,101 'x402 API' 'x402-payment'","prices":[{"id":"1cac9b6d-b71a-49f4-a1e0-b36bdc925599","listingId":"c20a54fe-1db6-49a6-ace5-490a8570013c","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/9","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:50:59.922Z"}],"sources":[{"listingId":"c20a54fe-1db6-49a6-ace5-490a8570013c","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/payments/9","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:50:59.922Z","lastSeenAt":"2026-04-23T19:01:23.061Z"}],"details":{"listingId":"c20a54fe-1db6-49a6-ace5-490a8570013c","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/payments/9 \\\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 (USD Coin) on the Base network","source_url":"https://lowpaymentfee.com/api/v1/payments/9"},{"claim":"The platform lists endpoints across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories, all at $0.02/request","source_url":"https://lowpaymentfee.com"},{"claim":"The platform advertises no API keys, no rate limits, instant access, and Base network settlement","source_url":"https://lowpaymentfee.com"},{"claim":"Documentation pages (docs, pricing, API, README) show only a 'Connect wallet' prompt","source_url":"https://lowpaymentfee.com/docs"}],"useCases":["Accessing premium API functionality with per-request USDC micropayments","Agent-driven API consumption without pre-registration or API keys","Programmatic pay-as-you-go access to data, AI, finance, or utility endpoints"],"bestFor":["Developers wanting zero-signup, 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-limited SLAs","Users without USDC on the Base network"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:05.388Z"},"updatedAt":"2026-04-23T19:01:23.061Z"}}