{"id":"0019db3d-6be2-4d90-b6fa-a9f01e9aa695","shortId":"W56A9t","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":"lowpaymentfee.com hosts a collection of pay-per-request API endpoints accessible via the x402 payment protocol on the Base network. The `/api/v1/payments/3` endpoint is labeled \"Premium API Access\" and accepts USDC payments at a maximum cost of $0.02 per request (20,000 base units of USDC with 6 decimals). No API keys, rate limits, or upfront commitments are required — callers simply attach an X-PAYMENT header with a valid x402 payment proof.\n\nThe broader platform advertises 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 are listed at $0.02 per request and settle in USDC on Base.\n\nHowever, the specific functionality behind the `/api/v1/payments/3` endpoint is not documented beyond its title \"Premium API Access.\" The crawled docs, pricing, and API pages returned only a wallet-connect prompt with no additional technical documentation, request/response schemas, or usage examples. It is unclear what data or service this particular endpoint returns upon successful payment.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","pay-per-request","no-api-key","http-post"],"categories":["api-gateway","payments"],"synonyms":["x402 API","pay-per-call API","USDC micropayment API","Base network API","lowpaymentfee","premium API access","crypto-paid API"],"warnings":["No documentation available for what this endpoint returns upon successful payment","No request or response schema provided","Docs, pricing, and API pages are gated behind wallet connect with no public content","The specific purpose of /api/v1/payments/3 ('Premium API Access') is ambiguous — it is unclear how it differs from the other listed endpoints"],"endpointUrl":"https://lowpaymentfee.com/api/v1/payments/3","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/payments/3","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.300","qualityRationale":"The endpoint is live (returns a valid 402 x402 challenge) and pricing is clear ($0.02 USDC on Base), but there is no documentation of what the endpoint actually returns, no request/response schema, and no usage examples. The docs, pricing, and API pages are all behind a wallet-connect gate with no public 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'/request':13,28 '0.02':12,27,69,151 '000':73 '20':72 '6':79 'Base network API' 'USDC micropayment API' 'accept':61 'access':7,22,42,59,176 'addit':193 'advertis':108 'ai':120 'analysi':124 'analyt':114 'api':6,21,40,58,82,175,182 'attach':93 'base':9,24,50,74,159 'base-network' 'behind':164 'beyond':171 'broader':106 'call':4,19 'caller':91 'categori':112 'classif':127 'collect':34 'commit':88 'connect':189 'convers':144 'cost':67 'crawl':178 'crypto-paid API' 'data':113,117,205 'decim':80 'doc':179 'document':170,195 'embed':128 'endpoint':41,54,109,147,167,210 'estim':138 'exampl':200 'exchang':133 'export':118 'feed':132 'financ':129 'four':111 'function':163 'gas':137 'generat':145 'geocod':142 'header':98 'host':32 'howev':160 'http-post' 'infrastructur':140 'insight':119 'key':83 'label':56 'learn':122 'limit':85 'list':149 'lowpaymentfee' 'lowpaymentfee.com':31 'machin':121 'maximum':66 'metric':115 'network':51 'no-api-key' 'page':183 'particular':209 'pay':2,17,37 'pay-per-cal':1,16 'pay-per-call API' 'pay-per-request':36 'payment':46,63,97,103,214 'per':3,18,38,70,152 'platform':107 'premium':5,20,57,174 'premium API access' 'price':131,180 'prompt':190 'proof':104 'protocol':47 'quot':136 'rate':84,134 'report':116 'request':39,71,153 'request/response':196 'requir':90 'return':184,211 'schema':197 'sentiment':123 'servic':207 'settl':155 'simpli':92 'span':110 'specif':162 'success':213 'summar':126 'technic':194 'text':125 'titl':173 'token':135 'unclear':203 'unit':75 'upfront':87 'upon':212 'usag':199 'usdc':15,30,62,77,157 'usdc-settlement' 'util':141 'valid':101,143 'via':10,25,43 'wallet':188 'wallet-connect':187 'web3':130 'x':96 'x-payment':95 'x402':11,26,45,102 'x402 API' 'x402-payment'","prices":[{"id":"2263d588-91a9-4301-8973-efed28e35b7a","listingId":"0019db3d-6be2-4d90-b6fa-a9f01e9aa695","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/payments/3","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:50:14.378Z"}],"sources":[{"listingId":"0019db3d-6be2-4d90-b6fa-a9f01e9aa695","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/payments/3","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:50:14.378Z","lastSeenAt":"2026-04-23T12:31:28.070Z"}],"details":{"listingId":"0019db3d-6be2-4d90-b6fa-a9f01e9aa695","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/payments/3 \\\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 x402 challenge with maxAmountRequired of 20000 in USDC (asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base","source_url":"https://lowpaymentfee.com/api/v1/payments/3"},{"claim":"All endpoints are listed at $0.02 per request with no API keys, no rate limits, and instant access on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"The platform offers endpoints across Data & Analytics, AI & Machine Learning, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"}],"useCases":["Accessing premium API services without traditional API key registration","Making one-off paid API calls settled in USDC on Base","Agent-driven programmatic access to pay-per-request endpoints"],"bestFor":["Developers who want instant API access without signup or API keys","Agents and bots that can settle x402 payments on Base","Users comfortable paying per request in USDC"],"notFor":["Users who need detailed API documentation or response schemas before purchasing","Anyone without a Base-compatible USDC wallet","High-volume consumers who need subscription-based pricing"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:07.642Z"},"updatedAt":"2026-04-23T12:31:28.070Z"}}