{"id":"81531ce8-e42e-4901-9f94-006712558285","shortId":"FEFvW3","kind":"x402","title":"Pay-per-request premium API access on Base via x402 — $0.02/call in USDC.","tagline":"Pay-per-request premium API access on Base via x402 — $0.02/call in USDC.","description":"This endpoint at lowpaymentfee.com provides \"Premium API Access\" via the x402 payment protocol. The site hosts a collection of pay-per-request APIs spanning data & analytics, 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, payable in USDC on the Base network with no API keys, no rate limits, and no commitments required.\n\nThe specific endpoint `/api/v1/charges/296` is described as \"Premium API Access\" and accepts POST requests. The x402 challenge confirms it is live, requesting a maximum of 20,000 base units of USDC (0x8335…2913 on Base), which equals $0.02 given USDC's 6 decimals. Payment is made via the x402 exact scheme, settling to the specified wallet address with a 300-second timeout.\n\nDocumentation is extremely sparse — 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 detailed description of what this particular charge endpoint returns. The landing page lists many API paths but does not document their input parameters or response formats. Prospective users should expect to experiment or contact the provider for details.","tags":[],"capabilities":["x402-payment","pay-per-request","usdc-base","no-api-key","post-endpoint","json-response"],"categories":["api-gateway","infrastructure"],"synonyms":["low payment fee","x402 api","pay per call api","micropayment api","base usdc api","premium api access","lowpaymentfee"],"warnings":["Documentation pages (docs, API, pricing, README) all render only 'Connect wallet' with no usable content","No OpenAPI or schema available — request parameters and response format are unknown","The specific functionality of /api/v1/charges/296 is not documented; 'Premium API Access' is vague","The site lists many API paths on its landing page but none have documented inputs or outputs"],"endpointUrl":"https://lowpaymentfee.com/api/v1/charges/296","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/296","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 challenge, but documentation is essentially nonexistent — all doc pages show only 'Connect wallet'. There is no OpenAPI schema, no request/response examples, and the specific purpose of /api/v1/charges/296 beyond 'Premium API Access' is unclear. Pricing is confirmed at $0.02 per 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'/call':13,28 '0.02':12,27,89,147 '000':136 '0x8335':141 '20':135 '2913':142 '300':169 '6':151 'accept':121 'access':7,22,38,119 'address':166 'ai':58 'analysi':62 'analyt':57 'api':6,21,37,54,101,118,178,218 'base':9,24,97,137,144 'base usdc api' 'challeng':126 'charg':210 'classif':65 'collect':48 'commit':108 'confirm':127 'connect':187 'contact':237 'content':193 'convers':82 'data':56 'decim':152 'describ':115 'descript':205 'detail':204,241 'doc':177 'document':172,223 'embed':66 'endpoint':32,85,112,211 'equal':146 'estim':76 'exact':159 'exampl':201 'exchang':71 'expect':233 'experi':235 'extrem':174 'feed':70 'financ':67 'format':229 'gas':75 'generat':83 'geocod':80 'given':148 'host':46 'infrastructur':78 'input':225 'json-response' 'key':102 'land':214 'learn':60 'limit':105 'list':216 'live':130 'low payment fee' 'lowpaymentfee' 'lowpaymentfee.com':34 'machin':59 'made':155 'mani':217 'maximum':133 'micropayment api' 'network':98 'no-api-key' 'openapi':197 'page':182,215 'paramet':226 'particular':209 'path':219 'pay':2,17,51 'pay per call api' 'pay-per-request':1,16,50 'payabl':92 'payment':42,153 'per':3,18,52,90 'post':122 'post-endpoint' 'premium':5,20,36,117 'premium api access' 'price':69,87,179 'prompt':189 'prospect':230 'protocol':43 'provid':35,239 'quot':74 'rate':72,104 'readm':181 'render':184 'request':4,19,53,91,123,131 'request/response':200 'requir':109 'respons':228 'return':212 'schema':198 'scheme':160 'second':170 'sentiment':61 'settl':161 'site':45 'span':55 'spars':175 'specif':111 'specifi':164 'summar':64 'text':63 'timeout':171 'token':73 'unit':138 'usdc':15,30,94,140,149 'usdc-base' 'user':231 'util':79 'valid':81 'via':10,25,39,156 'wallet':165,188 'web3':68 'x402':11,26,41,125,158 'x402 api' 'x402-payment'","prices":[{"id":"f6b234b7-0888-4769-a92f-481310b16602","listingId":"81531ce8-e42e-4901-9f94-006712558285","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/296","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:44:59.296Z"}],"sources":[{"listingId":"81531ce8-e42e-4901-9f94-006712558285","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/charges/296","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:44:59.296Z","lastSeenAt":"2026-04-24T01:32:05.890Z"}],"details":{"listingId":"81531ce8-e42e-4901-9f94-006712558285","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/charges/296 \\\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":"All endpoints priced at $0.02 per request with no API keys, no rate limits, instant access on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"x402 challenge returns maxAmountRequired of 20000 base units of USDC (0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base, equaling $0.02","source_url":"https://lowpaymentfee.com/api/v1/charges/296"},{"claim":"Site offers APIs across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"}],"useCases":["Accessing premium API services without subscription or API key management","Making one-off paid API calls settled instantly in USDC on Base","Agent-driven workflows that need on-demand paid endpoints with no signup"],"bestFor":["Developers wanting frictionless pay-per-use API access","AI agents that can settle x402 payments autonomously","Users who prefer crypto micropayments over traditional billing"],"notFor":["Users needing detailed API documentation or OpenAPI specs before integrating","High-volume consumers who would benefit from bulk pricing or subscriptions","Anyone without a Base-compatible USDC wallet"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:22.848Z"},"updatedAt":"2026-04-24T01:32:05.890Z"}}