{"id":"d7645b43-bb3b-428e-ad1c-3c1f521b2f84","shortId":"qgZCQR","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 `/api/v1/transactions/34` is listed as \"Premium API Access\" and returns a 402 challenge requesting 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 — you simply attach an x402 payment header to each request.\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, documentation is extremely thin. The docs, API, pricing, and README pages all render only a \"Connect wallet\" prompt with no further technical detail. There is no OpenAPI spec, no request/response schema documentation, and no example payloads available. The specific functionality behind `/api/v1/transactions/34` (\"Premium API Access\") is not described beyond its title, making it unclear what data or service it actually returns.","tags":[],"capabilities":["x402-payment","usdc-base-network","pay-per-request","no-api-key","data-analytics","ai-inference","finance-data","crypto-data","geocoding","utility-services"],"categories":["api-platform","finance","llm","geo"],"synonyms":["x402 API","pay per call API","USDC API","Base network API","micropayment API","lowpaymentfee","crypto API payments","402 payment protocol"],"warnings":["No OpenAPI or schema documentation available — all docs/pricing/README pages return only 'Connect wallet'","The specific functionality of /api/v1/transactions/34 ('Premium API Access') is not described anywhere","No request body schema or response schema is documented","Cannot verify what data or service this endpoint actually provides"],"endpointUrl":"https://lowpaymentfee.com/api/v1/transactions/34","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/transactions/34","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 OpenAPI spec, no documentation beyond a landing page listing, no request/response schemas, and no examples. The actual functionality of this specific endpoint is undescribed. This is effectively a stub 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'/request':13,28,152 '0.02':12,27,78,151 '000':72 '20':71 '402':66 '402 payment protocol' 'Base network API' 'USDC API' 'accept':46 'access':62,92,200 'across':108 'actual':215 'advertis':83 'ai':118 'ai-inference' 'analysi':122 'analyt':112 'api':5,20,38,61,85,162,199 'attach':95 'avail':192 'base':8,23,51,73 'behind':196 'beyond':204 'broader':104 'call':4,19,80 'categori':110 'challeng':67 'classif':125 'connect':171 'convers':142 'crypto API payments' 'crypto-data' 'data':111,115,211 'data-analytics' 'describ':203 'detail':178 'doc':161 'document':156,187 'embed':126 'endpoint':55,107,145 'estim':136 'exampl':190 'exchang':131 'export':116 'extrem':158 'feed':130 'financ':127 'finance-data' 'four':109 'function':195 'gas':135 'generat':143 'geocod':140 'geocoding' 'header':99 'howev':155 'i.e':77 'infrastructur':138 'insight':117 'instant':91 'key':86 'learn':120 'limit':89 'list':58,147 'lowpaymentfee' 'lowpaymentfee.com':31 'machin':119 'make':207 'metric':113 'micropayment API' 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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/transactions/34","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T19:26:05.303Z"}],"sources":[{"listingId":"d7645b43-bb3b-428e-ad1c-3c1f521b2f84","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/transactions/34","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T19:26:05.303Z","lastSeenAt":"2026-04-22T20:01:39.986Z"}],"details":{"listingId":"d7645b43-bb3b-428e-ad1c-3c1f521b2f84","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/transactions/34 \\\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 up to 20,000 base units of USDC ($0.02) on Base network","source_url":"https://lowpaymentfee.com/api/v1/transactions/34"},{"claim":"The platform lists endpoints across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories, all at $0.02/request","source_url":"https://lowpaymentfee.com"},{"claim":"The platform advertises no API keys, no rate limits, instant access, and Base network settlement","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset address 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base network","source_url":"https://lowpaymentfee.com/api/v1/transactions/34"}],"useCases":["Accessing data analytics and reports on a per-request payment basis without subscription","Running AI inference tasks (sentiment, summarization, classification, embeddings) with per-call USDC payments","Fetching crypto price feeds, gas estimates, and exchange rates via micropayments","Geocoding and data conversion utilities paid per use"],"bestFor":["Developers who want API access without managing API keys or subscriptions","Agents and bots that can settle payments programmatically via x402 on Base","Low-volume or sporadic API consumers who prefer pay-as-you-go pricing"],"notFor":["High-volume production workloads needing guaranteed SLAs and detailed documentation","Users who need well-documented request/response schemas before integrating"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:38.898Z"},"updatedAt":"2026-04-22T20:01:39.986Z"}}