{"id":"7bbe147d-6ae1-4259-95d4-71a4b4b966e3","shortId":"Eaw4Vj","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/134` 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 uniformly priced at $0.02 per request.\n\nHowever, documentation is extremely thin. 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 description of what the `/api/v1/charges/134` endpoint specifically returns. The endpoint is live (returns a valid 402 challenge), but without documentation it is unclear what data or functionality it provides beyond the generic \"Premium API Access\" label.","tags":[],"capabilities":["x402-payment","usdc-base-network","pay-per-request","no-api-key","json-response"],"categories":["api-platform","payments"],"synonyms":["x402 API","micropayment API","USDC pay-per-call","Base network API","low fee API","crypto API payment"],"warnings":["No documentation available — docs, API, pricing, and README pages all show only 'Connect wallet'","No OpenAPI or schema describing request parameters or response format","The specific purpose of /api/v1/charges/134 ('Premium API Access') is not explained anywhere","Cannot verify what data or service this endpoint actually provides"],"endpointUrl":"https://lowpaymentfee.com/api/v1/charges/134","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/134","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 pricing and payment details. However, there is no OpenAPI schema, no request/response examples, and all documentation pages render only 'Connect wallet' with no useful content. The specific functionality of /api/v1/charges/134 is entirely undocumented, making this effectively a stub 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'/request':13,28 '0.02':12,27,77,150 '000':72 '20':71 '402':66,201 'Base network API' 'USDC pay-per-call' 'accept':46 'access':62,92,220 'across':108 'advertis':83 'ai':118 'analysi':122 'analyt':112 'api':5,20,38,61,85,160,219 'attach':95 'base':8,23,51,73 'beyond':215 'broader':104 'call':4,19,80 'categori':110 'challeng':67,202 'classif':125 'connect':169 'content':175 'convers':142 'crypto API payment' 'data':111,115,210 'descript':186 'doc':159 'document':154,205 'embed':126 'endpoint':55,107,145,191,195 'estim':136 'exampl':183 'exchang':131 'export':116 'extrem':156 'feed':130 'financ':127 'four':109 'function':212 'gas':135 'generat':143 'generic':217 'geocod':140 'header':99 'howev':153 'infrastructur':138 'insight':117 'instant':91 'json-response' 'key':86 'label':221 'learn':120 'limit':89 'list':58 'live':197 'low fee API' 'lowpaymentfee.com':31 'machin':119 'metric':113 'micropayment API' 'network':9,24,52 'no-api-key' 'offer':106 'openapi':179 'page':164 'pay':2,17,35 'pay-per-cal':1,16 'pay-per-request':34 'payment':48,98 'per':3,18,36,79,151 'platform':6,21,39,82,105 'premium':60,218 'price':129,148,161 'prompt':171 'protocol':44 'provid':214 'quot':134 'rate':88,132 'readm':163 'render':166 'report':114 'request':37,68,102,152 'request/response':182 'return':64,193,198 'schema':180 'sentiment':121 'simpli':94 'specif':54,192 'summar':124 'text':123 'thin':157 'token':133 'unclear':208 'uniform':147 'unit':74 'usd':78 'usdc':15,30,47,76 'usdc-base-network' 'use':41 'util':139 'valid':141,200 'via':10,25 'wallet':170 'web3':128 'without':204 'x402':11,26,43,97 'x402 API' 'x402-payment'","prices":[{"id":"5536449c-11b8-4c01-9cf0-285b03192d10","listingId":"7bbe147d-6ae1-4259-95d4-71a4b4b966e3","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/134","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:44:11.553Z"}],"sources":[{"listingId":"7bbe147d-6ae1-4259-95d4-71a4b4b966e3","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/charges/134","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:44:11.553Z","lastSeenAt":"2026-04-24T15:02:21.115Z"}],"details":{"listingId":"7bbe147d-6ae1-4259-95d4-71a4b4b966e3","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/charges/134 \\\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 (0.02 USD) on Base network","source_url":"https://lowpaymentfee.com/api/v1/charges/134"},{"claim":"The platform advertises $0.02/request pricing with no API keys, no rate limits, and instant access","source_url":"https://lowpaymentfee.com"},{"claim":"The platform offers endpoints across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"},{"claim":"The USDC asset contract is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base","source_url":"https://lowpaymentfee.com/api/v1/charges/134"}],"useCases":["Programmatic access to various API services with per-call USDC micropayments","Agent-driven workflows that need keyless, pay-as-you-go API access","Testing x402 protocol integrations on Base network"],"bestFor":["Developers wanting to avoid API key management and subscriptions","AI agents that can settle payments via x402 on Base","Users who need low-cost per-request pricing without commitments"],"notFor":["Users who need detailed API documentation or OpenAPI specs before integrating","High-volume consumers who would benefit from bulk pricing or subscriptions","Anyone without a Base-network USDC wallet"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:25.054Z"},"updatedAt":"2026-04-24T15:02:21.115Z"}}