{"id":"d7c7a936-15b2-43bf-bc4f-e9cf7b2f23e7","shortId":"S4qYH8","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":"lowpaymentfee.com hosts a collection of pay-per-request API endpoints gated by the x402 payment protocol. The specific endpoint at `/api/v1/products/49` is labeled \"Premium API Access\" and returns a 402 challenge requesting payment in USDC on the Base network. The site advertises a flat $0.02 per request across all its endpoints, with no API keys, no rate limits, and instant access.\n\nThe broader platform offers endpoints spanning 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 settle payments in USDC on Base.\n\nThe x402 challenge for this specific endpoint shows a `maxAmountRequired` of 20000 base units of USDC (6 decimals), which equals $0.02 — consistent with the site's advertised pricing. The payment is sent to address `0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3`. No OpenAPI schema, detailed documentation, or example request/response payloads were found in the crawl; the docs, API, pricing, and README pages all returned only a \"Connect wallet\" prompt with no substantive content.","tags":[],"capabilities":["x402-payment","usdc-base","pay-per-request","no-api-key","data-analytics","ai-inference","finance-data","crypto-data","geocoding","utility-services"],"categories":["api-marketplace","finance","llm","geo"],"synonyms":["x402 API","pay-per-call API","USDC API","Base network API","micropayment API","lowpaymentfee","premium API access"],"warnings":["No OpenAPI or schema documentation available — endpoint behavior must be discovered experimentally","The specific functionality of /api/v1/products/49 is unclear; 'Premium API Access' is a generic label with no further detail","Docs, pricing, API, and README pages all render only a 'Connect wallet' prompt with no substantive content","No example requests or responses are available anywhere in the crawl"],"endpointUrl":"https://lowpaymentfee.com/api/v1/products/49","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/products/49","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.350","qualityRationale":"The endpoint is live and returns a valid x402 challenge with clear pricing. However, there is no OpenAPI schema, no documentation beyond a landing page listing, no example request/response payloads, and the specific purpose of /api/v1/products/49 ('Premium API Access') is entirely opaque. The docs/pricing/README pages are empty 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'/call':13,28 '0.02':12,27,76,162 '0x1a2b13e97f5f837c8f9fa1f95a1484b7c70d85f3':176 '20000':153 '402':61 '6':158 'Base network API' 'USDC API' 'access':7,22,57,92 'across':79 'address':175 'advertis':73,168 'ai':108 'ai-inference' 'analysi':112 'analyt':102 'api':6,21,40,56,85,193 'base':9,24,69,141,154 'broader':94 'categori':100 'challeng':62,144 'classif':115 'collect':34 'connect':202 'consist':163 'content':208 'convers':132 'crawl':190 'crypto-data' 'data':101,105 'data-analytics' 'decim':159 'detail':180 'doc':192 'document':181 'embed':116 'endpoint':41,50,82,97,135,148 'equal':161 'estim':126 'exampl':183 'exchang':121 'export':106 'feed':120 'financ':117 'finance-data' 'flat':75 'found':187 'four':99 'gas':125 'gate':42 'generat':133 'geocod':130 'geocoding' 'host':32 'infrastructur':128 'insight':107 'instant':91 'key':86 'label':54 'learn':110 'limit':89 'lowpaymentfee' 'lowpaymentfee.com':31 'machin':109 'maxamountrequir':151 'metric':103 'micropayment API' 'network':70 'no-api-key' 'offer':96 'openapi':178 'page':197 'pay':2,17,37 'pay-per-call API' 'pay-per-request':1,16,36 'payload':185 'payment':46,64,137,171 'per':3,18,38,77 'platform':95 'premium':5,20,55 'premium API access' 'price':119,169,194 'prompt':204 'protocol':47 'quot':124 'rate':88,122 'readm':196 'report':104 'request':4,19,39,63,78 'request/response':184 'return':59,199 'schema':179 'sent':173 'sentiment':111 'settl':136 'show':149 'site':72,166 'span':98 'specif':49,147 'substant':207 'summar':114 'text':113 'token':123 'unit':155 'usdc':15,30,66,139,157 'usdc-base' 'util':129 'utility-services' 'valid':131 'via':10,25 'wallet':203 'web3':118 'x402':11,26,45,143 'x402 API' 'x402-payment'","prices":[{"id":"67d39445-d23b-49e5-94a3-88ab323d57b0","listingId":"d7c7a936-15b2-43bf-bc4f-e9cf7b2f23e7","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/products/49","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:37:05.912Z"}],"sources":[{"listingId":"d7c7a936-15b2-43bf-bc4f-e9cf7b2f23e7","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/products/49","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:37:05.912Z","lastSeenAt":"2026-04-23T13:30:31.800Z"}],"details":{"listingId":"d7c7a936-15b2-43bf-bc4f-e9cf7b2f23e7","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/products/49 \\\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 20000 base units of USDC on Base network","source_url":"https://lowpaymentfee.com/api/v1/products/49"},{"claim":"The site advertises $0.02 per request with no API keys, no rate limits, and instant access","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/products/49"},{"claim":"The platform offers endpoints in Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"}],"useCases":["Accessing analytics metrics and reports without subscription or API key management","Running AI inference tasks (sentiment, summarization, classification, embeddings) on a per-request payment basis","Fetching real-time crypto token quotes, gas estimates, and exchange rates","Geocoding and data conversion utilities paid per call"],"bestFor":["Agents or developers who want zero-signup, pay-as-you-go API access","Crypto-native workflows that can settle USDC payments on Base","Low-volume or bursty usage patterns where subscriptions are wasteful"],"notFor":["High-volume production workloads needing guaranteed SLAs and detailed documentation","Users without a Base-compatible USDC wallet"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:45.917Z"},"updatedAt":"2026-04-23T13:30:31.800Z"}}