{"id":"28162099-b285-4ab6-b826-f3d74e41d59e","shortId":"2AsjVy","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 `/api/v1/charges/118` is listed as \"Premium API Access\" and returns a 402 challenge requesting up to 20,000 base units of USDC (i.e., $0.02) per call. 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 multiple API categories including 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.\n\nHowever, the specific endpoint being listed here (`/api/v1/charges/118`) has a generic \"Premium API Access\" description with no documentation on what data or functionality it actually returns. The docs, pricing, and README pages on the site are effectively empty (showing only a \"Connect wallet\" prompt). Without further documentation or example responses, the actual behavior of this endpoint is unknown.","tags":[],"capabilities":["x402-payment","usdc-base","pay-per-request","no-api-key","json-response","http-post"],"categories":["general","infrastructure"],"synonyms":["x402 API","pay-per-call API","USDC micropayment API","Base network API","lowpaymentfee","premium API access","crypto-paid API"],"warnings":["No documentation available — docs, pricing, and README pages only show 'Connect wallet' with no content","The specific functionality of /api/v1/charges/118 ('Premium API Access') is completely undocumented","No input or output schema provided; callers cannot know what to send or expect back","The platform lists many API categories but it is unclear if they are all functional"],"endpointUrl":"https://lowpaymentfee.com/api/v1/charges/118","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/118","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 on what this specific endpoint does, no input/output schema, no example requests or responses, and the site's docs pages are empty. The listing is essentially a stub with confirmed liveness but unknown 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'/request':13,28,152 '0.02':12,27,78,151 '000':72 '20':71 '402':66 'Base network API' 'USDC micropayment API' 'accept':46 'access':62,168 'actual':179,206 'advertis':106 'ai':118 'analysi':122 'analyt':112 'api':5,20,38,61,82,108,167 'attach':91 'base':8,23,51,73 'behavior':207 'broader':104 'call':4,19,80 'caller':89 'categori':109 'challeng':67 'classif':125 'connect':196 'convers':142 'crypto-paid API' 'data':111,115,175 'descript':169 'doc':182 'document':172,201 'effect':191 'embed':126 'empti':192 'endpoint':55,145,158,210 'estim':136 'exampl':203 'exchang':131 'export':116 'feed':130 'financ':127 'function':177 'gas':135 'generat':143 'generic':165 'geocod':140 'header':96 'howev':155 'http-post' 'i.e':77 'includ':110 'infrastructur':138 'insight':117 'json-response' 'key':83 'learn':120 'limit':86 'list':58,147,160 'lowpaymentfee' 'lowpaymentfee.com':31 'machin':119 'metric':113 'multipl':107 'network':9,24,52 'no-api-key' 'page':186 'pay':2,17,35 'pay-per-cal':1,16 'pay-per-call API' 'pay-per-request':34 'payment':48,95,101 'per':3,18,36,79 'platform':6,21,39,105 'point':154 'premium':60,166 'premium API access' 'price':129,153,183 'prompt':198 'proof':102 'protocol':44 'quot':134 'rate':85,132 'readm':185 'report':114 'request':37,68 'requir':88 'respons':204 'return':64,180 'sentiment':121 'show':193 'simpli':90 'site':189 'specif':54,157 'summar':124 'text':123 'token':133 'unit':74 'unknown':212 'usdc':15,30,47,76 'usdc-base' 'use':41 'util':139 'valid':99,141 'via':10,25 'wallet':197 'web3':128 'without':199 'x':94 'x-payment':93 'x402':11,26,43,100 'x402 API' 'x402-payment'","prices":[{"id":"7f6876d0-6b26-4d58-8c5e-46ed0bca7917","listingId":"28162099-b285-4ab6-b826-f3d74e41d59e","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/118","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:44:04.283Z"}],"sources":[{"listingId":"28162099-b285-4ab6-b826-f3d74e41d59e","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/charges/118","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:44:04.283Z","lastSeenAt":"2026-04-22T10:01:41.343Z"}],"details":{"listingId":"28162099-b285-4ab6-b826-f3d74e41d59e","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/charges/118 \\\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 requesting up to 20,000 base units of USDC ($0.02) on Base network","source_url":"https://lowpaymentfee.com/api/v1/charges/118"},{"claim":"The platform lists APIs across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories, all at $0.02/request","source_url":"https://lowpaymentfee.com"},{"claim":"No API keys, no rate limits, instant access advertised","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset address 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base network","source_url":"https://lowpaymentfee.com/api/v1/charges/118"}],"useCases":["Accessing a pay-per-call API endpoint without needing API key registration","Making micropayments in USDC on Base for API access","Agent-driven API consumption with x402 payment protocol"],"bestFor":["Developers wanting zero-signup API access via crypto micropayments","AI agents that can settle x402 payments autonomously","Users who prefer pay-as-you-go pricing with no commitments"],"notFor":["Users needing detailed API documentation or guaranteed SLAs","Applications requiring free or fiat-only payment methods","Production workloads that need well-documented response schemas"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:25.46Z"},"updatedAt":"2026-04-22T10:01:41.343Z"}}