{"id":"3472a0e1-8690-409c-a2d6-8ad072662834","shortId":"GBr2tY","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 at `/api/v1/payments/351` is labeled \"Premium API Access\" and charges up to 20,000 base units of USDC (i.e., $0.02) per call. The platform advertises no API keys, no rate limits, and instant access — callers simply attach an X-PAYMENT header with a valid x402 payment proof.\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 listed at the same $0.02/request price point.\n\nHowever, the specific functionality behind the `/api/v1/payments/351` endpoint is not documented beyond its title \"Premium API Access.\" The crawled docs, pricing, and README pages returned only a wallet-connect prompt with no additional content. There is no OpenAPI spec, no request/response schema documentation, and no examples of what this endpoint actually returns. The endpoint is confirmed live (returns a valid 402 challenge), but the lack of documentation makes it difficult to know what data or service it provides.","tags":[],"capabilities":["x402-payment","usdc-base-network","pay-per-request","no-api-key","json-response"],"categories":["api-platform","payments"],"synonyms":["x402 api","pay per call api","usdc api","base network api","micropayment api","lowpaymentfee","402 payment api"],"warnings":["No documentation available for what /api/v1/payments/351 actually returns or accepts as input","No OpenAPI or schema specification found anywhere on the site","Docs, pricing, and README pages returned only 'Connect wallet' with no content","The specific purpose of 'Premium API Access' is undefined — it may be a generic or placeholder endpoint"],"endpointUrl":"https://lowpaymentfee.com/api/v1/payments/351","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/351","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 accepts USDC on Base at $0.02/request. However, there is no documentation of what the endpoint actually does, no OpenAPI spec, no request/response schemas, and no examples. The docs/pricing/README pages are all empty beyond a wallet-connect prompt. The listing is effectively a stub with confirmed 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'/request':13,28,152 '0.02':12,27,74,151 '000':68 '20':67 '402':216 '402 payment api' 'accept':46 'access':62,88,171 'across':108 'actual':206 'addit':188 'advertis':79 'ai':118 'analysi':122 'analyt':112 'api':5,20,38,61,81,170 'attach':91 'base':8,23,51,69 'base network api' 'behind':159 'beyond':166 'broader':104 'call':4,19,76 'caller':89 'categori':110 'challeng':217 'charg':64 'classif':125 'confirm':211 'connect':184 'content':189 'convers':142 'crawl':173 'data':111,115,229 'difficult':225 'doc':174 'document':165,198,222 'embed':126 'endpoint':55,107,145,162,205,209 'estim':136 'exampl':201 'exchang':131 'export':116 'feed':130 'financ':127 'four':109 'function':158 'gas':135 'generat':143 'geocod':140 'header':96 'howev':155 'i.e':73 'infrastructur':138 'insight':117 'instant':87 'json-response' 'key':82 'know':227 'label':59 'lack':220 'learn':120 'limit':85 'list':147 'live':212 'lowpaymentfee' 'lowpaymentfee.com':31 'machin':119 'make':223 'metric':113 'micropayment api' 'network':9,24,52 'no-api-key' 'offer':106 'openapi':193 'page':178 'pay':2,17,35 'pay per call api' 'pay-per-cal':1,16 'pay-per-request':34 'payment':48,95,101 'per':3,18,36,75 'platform':6,21,39,78,105 'point':154 'premium':60,169 'price':129,153,175 'prompt':185 'proof':102 'protocol':44 'provid':233 'quot':134 'rate':84,132 'readm':177 'report':114 'request':37 'request/response':196 'return':179,207,213 'schema':197 'sentiment':121 'servic':231 'simpli':90 'spec':194 'specif':54,157 'summar':124 'text':123 'titl':168 'token':133 'unit':70 'usdc':15,30,47,72 'usdc api' 'usdc-base-network' 'use':41 'util':139 'valid':99,141,215 'via':10,25 'wallet':183 'wallet-connect':182 'web3':128 'x':94 'x-payment':93 'x402':11,26,43,100 'x402 api' 'x402-payment'","prices":[{"id":"db31d5ef-bdd2-49cc-b0ba-56156cdda056","listingId":"3472a0e1-8690-409c-a2d6-8ad072662834","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/351","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:50:30.157Z"}],"sources":[{"listingId":"3472a0e1-8690-409c-a2d6-8ad072662834","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/payments/351","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:50:30.157Z","lastSeenAt":"2026-04-23T23:02:46.348Z"}],"details":{"listingId":"3472a0e1-8690-409c-a2d6-8ad072662834","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/payments/351 \\\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 valid x402 402 challenge with maxAmountRequired of 20000 base units of USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/payments/351"},{"claim":"All endpoints are priced at $0.02/request with no API keys, no rate limits, and instant access","source_url":"https://lowpaymentfee.com"},{"claim":"The platform offers endpoints in Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset address 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base network","source_url":"https://lowpaymentfee.com/api/v1/payments/351"}],"useCases":["Accessing premium API services with per-request USDC micropayments on Base","Agent-driven API consumption without pre-registration or API keys","Programmatic pay-as-you-go access to data, AI, finance, or utility endpoints"],"bestFor":["Developers wanting keyless, pay-per-use API access","AI agents that can settle x402 payments autonomously","Users comfortable paying in USDC on the Base L2 network"],"notFor":["Users who need detailed API documentation or guaranteed SLAs before purchasing","Applications requiring free or subscription-based pricing models","Users who cannot transact in USDC on Base network"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:06.907Z"},"updatedAt":"2026-04-23T23:02:46.348Z"}}