{"id":"6eea5260-4838-4e44-a577-9b7305e9ac00","shortId":"bS9ExM","kind":"x402","title":"Pay-per-call premium API access on Base via x402 — $0.02/request in USDC.","tagline":"Pay-per-call premium API access on Base via x402 — $0.02/request 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 minimum commitments.\n\nThe specific endpoint `/api/v1/charges/156` is described simply as \"Premium API Access\" and returns a 402 challenge requesting up to 20,000 base units of USDC (0.02 USD, since USDC uses 6 decimals) on Base. Payment is made via the x402 exact scheme to the specified wallet address. The endpoint accepts HTTP POST requests and returns application/json responses.\n\nDocumentation is extremely sparse — the docs, pricing, API, and README pages all render only a \"Connect wallet\" prompt with no further technical detail. There is no OpenAPI schema, no request/response examples, and no description of what data or functionality this particular charge endpoint actually returns. The site appears to be a demonstration or early-stage platform for x402-based micropayment APIs. Without more documentation it is unclear what payload to send or what response to expect from this specific endpoint.","tags":[],"capabilities":["x402-payment","usdc-base","pay-per-request","micropayment","http-post","json-response"],"categories":["api-gateway","payments"],"synonyms":["x402 api","micropayment api","pay per call api","USDC api access","Base network api","lowpaymentfee","premium api"],"warnings":["Documentation pages (/docs, /pricing, /api, /README) all render only 'Connect wallet' with no usable content.","No OpenAPI or schema available — request format and response structure are unknown.","The specific functionality of /api/v1/charges/156 is undocumented; 'Premium API Access' is a generic label.","This may be a demo or early-stage platform; production readiness is unclear."],"endpointUrl":"https://lowpaymentfee.com/api/v1/charges/156","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/156","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 works. However, documentation is essentially nonexistent — all doc pages show only 'Connect wallet'. There is no OpenAPI schema, no request/response examples, and no description of what this specific endpoint actually does beyond the generic label 'Premium API Access'. The listing is effectively a 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'/request':13,28 '0.02':12,27,89,135 '000':130 '20':129 '402':124 '6':140 'Base network api' 'USDC api access' 'accept':159 'access':7,22,38,120 'actual':210 'address':156 'ai':58 'analysi':62 'analyt':57 'api':6,21,37,54,101,119,174,229 'appear':214 'application/json':165 'base':9,24,97,131,143,227 'call':4,19 'challeng':125 'charg':208 'classif':65 'collect':48 'commit':109 'connect':182 'convers':82 'data':56,203 'decim':141 'demonstr':218 'describ':115 'descript':200 'detail':189 'doc':172 'document':167,232 'earli':221 'early-stag':220 'embed':66 'endpoint':32,85,112,158,209,248 'estim':76 'exact':150 'exampl':197 'exchang':71 'expect':244 'extrem':169 'feed':70 'financ':67 'function':205 'gas':75 'generat':83 'geocod':80 'host':46 'http':160 'http-post' 'infrastructur':78 'json-response' 'key':102 'learn':60 'limit':105 'lowpaymentfee' 'lowpaymentfee.com':34 'machin':59 'made':146 'micropay':228 'micropayment' 'micropayment api' 'minimum':108 'network':98 'openapi':193 'page':177 'particular':207 'pay':2,17,51 'pay per call api' 'pay-per-cal':1,16 'pay-per-request':50 'payabl':92 'payload':237 'payment':42,144 'per':3,18,52,90 'platform':223 'post':161 'premium':5,20,36,118 'premium api' 'price':69,87,173 'prompt':184 'protocol':43 'provid':35 'quot':74 'rate':72,104 'readm':176 'render':179 'request':53,91,126,162 'request/response':196 'respons':166,242 'return':122,164,211 'schema':194 'scheme':151 'send':239 'sentiment':61 'simpli':116 'sinc':137 'site':45,213 'span':55 'spars':170 'specif':111,247 'specifi':154 'stage':222 'summar':64 'technic':188 'text':63 'token':73 'unclear':235 'unit':132 'usd':136 'usdc':15,30,94,134,138 'usdc-base' 'use':139 'util':79 'valid':81 'via':10,25,39,147 'wallet':155,183 'web3':68 'without':230 'x402':11,26,41,149,226 'x402 api' 'x402-based':225 'x402-payment'","prices":[{"id":"8cef80dc-b0ea-42fe-8d6c-8166a116dfc0","listingId":"6eea5260-4838-4e44-a577-9b7305e9ac00","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/156","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:44:18.835Z"}],"sources":[{"listingId":"6eea5260-4838-4e44-a577-9b7305e9ac00","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/charges/156","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:44:18.835Z","lastSeenAt":"2026-04-24T05:02:31.123Z"}],"details":{"listingId":"6eea5260-4838-4e44-a577-9b7305e9ac00","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/charges/156 \\\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, and instant access on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"x402 challenge returns maxAmountRequired of 20000 base units of USDC (0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base","source_url":"https://lowpaymentfee.com/api/v1/charges/156"},{"claim":"Site offers APIs across data & analytics, AI & ML, finance & Web3, and infrastructure categories","source_url":"https://lowpaymentfee.com"}],"useCases":["Programmatic pay-per-call access to various API services without API key management","Agent-driven micropayment workflows on Base using USDC","Testing x402 payment protocol integrations"],"bestFor":["Developers exploring x402 micropayment protocols","Agents that need keyless, pay-as-you-go API access","Projects wanting to avoid subscription commitments for occasional API calls"],"notFor":["Production workloads requiring well-documented, stable API contracts","Users who need detailed request/response schemas before integrating","High-volume use cases where per-request pricing may not be cost-effective"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:24.739Z"},"updatedAt":"2026-04-24T05:02:31.123Z"}}