{"id":"b82625dd-a519-4e2e-a1e2-8b4dbd392fa9","shortId":"fLNMqq","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 is a pay-per-request API platform that uses the x402 protocol to accept USDC payments on the Base network. The specific endpoint `/api/v1/charges/102` is labeled \"Premium API Access\" and requires a maximum of 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 `/api/v1/charges/102` (\"Premium API Access\") is not documented beyond its title. The docs, pricing, and README pages all returned only a \"Connect wallet\" prompt with no additional content. There is no OpenAPI schema, no request/response examples, and no detailed documentation available from the crawl. The endpoint is confirmed live — it returns a proper 402 challenge with x402 version 1 — but what data or service it actually returns upon successful payment is unknown.","tags":[],"capabilities":["x402-payment","usdc-base","pay-per-request","no-api-key","no-rate-limit"],"categories":["api-gateway","crypto"],"synonyms":["x402 API","USDC pay-per-call","Base network API","micropayment API","lowpaymentfee","premium API access","crypto-paid endpoint"],"warnings":["The specific functionality of /api/v1/charges/102 ('Premium API Access') is not documented — it is unclear what data or service is returned upon payment.","No OpenAPI schema, request body schema, or response examples are available.","All documentation pages (docs, pricing, README, api) returned only 'Connect wallet' with no substantive content.","The endpoint name 'charges/102' suggests a generic or placeholder resource rather than a well-defined API service."],"endpointUrl":"https://lowpaymentfee.com/api/v1/charges/102","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/102","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.300","qualityRationale":"The endpoint is confirmed live with a valid 402 challenge, and pricing is clear ($0.02 USDC on Base). However, there is no documentation, no OpenAPI schema, no request/response examples, and the actual functionality behind 'Premium API Access' is completely undocumented. The docs/pricing/README pages returned no useful 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'/request':13,28,152 '0.02':12,27,74,151 '000':68 '1':217 '20':67 '402':212 'Base network API' 'USDC pay-per-call' 'accept':46 'access':7,22,61,88,163 'across':108 'actual':224 'addit':185 'advertis':79 'ai':118 'analysi':122 'analyt':112 'api':6,21,38,60,81,162 'attach':91 'avail':199 'base':9,24,51,69 'behind':159 'beyond':167 'broader':104 'call':4,19,76 'caller':89 'categori':110 'challeng':213 'classif':125 'confirm':206 'connect':180 'content':186 'convers':142 'crawl':202 'crypto-paid endpoint' 'data':111,115,220 'detail':197 'doc':171 'document':166,198 'embed':126 'endpoint':55,107,145,204 'estim':136 'exampl':194 '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 'key':82 'label':58 'learn':120 'limit':85 'list':147 'live':207 'lowpaymentfee' 'lowpaymentfee.com':31 'machin':119 'maximum':65 'metric':113 'micropayment API' 'network':52 'no-api-key' 'no-rate-limit' 'offer':106 'openapi':190 'page':175 'pay':2,17,35 'pay-per-cal':1,16 'pay-per-request':34 'payment':48,95,101,228 'per':3,18,36,75 'platform':39,78,105 'point':154 'premium':5,20,59,161 'premium API access' 'price':129,153,172 'prompt':182 'proof':102 'proper':211 'protocol':44 'quot':134 'rate':84,132 'readm':174 'report':114 'request':37 'request/response':193 'requir':63 'return':177,209,225 'schema':191 'sentiment':121 'servic':222 'simpli':90 'specif':54,157 'success':227 'summar':124 'text':123 'titl':169 'token':133 'unit':70 'unknown':230 'upon':226 'usdc':15,30,47,72 'usdc-base' 'use':41 'util':139 'valid':99,141 'version':216 'via':10,25 'wallet':181 'web3':128 'x':94 'x-payment':93 'x402':11,26,43,100,215 'x402 API' 'x402-payment'","prices":[{"id":"f8d4b31e-b75a-427e-9e8f-ae95319fe734","listingId":"b82625dd-a519-4e2e-a1e2-8b4dbd392fa9","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/102","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:44:09.107Z"}],"sources":[{"listingId":"b82625dd-a519-4e2e-a1e2-8b4dbd392fa9","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/charges/102","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:44:09.107Z","lastSeenAt":"2026-04-24T01:32:03.746Z"}],"details":{"listingId":"b82625dd-a519-4e2e-a1e2-8b4dbd392fa9","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/charges/102 \\\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":"Endpoint returns 402 with x402 version 1 challenge requiring max 20000 base units of USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/charges/102"},{"claim":"USDC asset contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/charges/102"},{"claim":"Platform advertises $0.02/request pricing with no API keys, no rate limits, and instant access","source_url":"https://lowpaymentfee.com"},{"claim":"Platform lists endpoints across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"}],"useCases":["Accessing premium API data without traditional API key registration","Making one-off paid API calls settled in USDC on Base","Agent-driven workflows that need keyless, pay-as-you-go API access"],"bestFor":["Developers who want to avoid API key management and subscriptions","AI agents that can settle x402 payments autonomously on Base","Low-volume or sporadic API consumers who prefer per-call pricing"],"notFor":["Users who need detailed API documentation or guaranteed SLAs before purchasing","High-volume consumers who would benefit from bulk pricing or subscriptions","Anyone without access to USDC on the Base network"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:25.172Z"},"updatedAt":"2026-04-24T01:32:03.746Z"}}