{"id":"0f65cbcc-0170-4b93-baa8-96efaa2c54de","shortId":"PCXUSR","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 an x402-enabled API platform that offers a broad catalog of endpoints spanning data analytics, AI/ML inference, finance/Web3 data, and infrastructure utilities. Every endpoint costs $0.02 per request, paid in USDC on the Base network with no API keys, no rate limits, and no commitments required. The specific endpoint at `/api/v1/transactions/324` is listed as \"Premium API Access\" and returns an x402 challenge requesting up to 20,000 base units of USDC (0.02 USD, since USDC uses 6 decimals) on Base.\n\nThe platform advertises categories including 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 (geocoding, validation, conversion, generation). All endpoints appear to follow the same pricing model. However, documentation beyond the landing page is essentially empty — the /docs, /api, /pricing, and /README pages all render only a \"Connect wallet\" prompt with no further technical detail.\n\nBecause there is no OpenAPI schema, no request/response examples, and no documentation describing what this particular transactions endpoint accepts or returns, the actual functionality behind this specific endpoint is unclear. The x402 challenge confirms the endpoint is live and accepting payment-gated POST requests, but the lack of documentation makes it difficult to determine what data or service is provided in return.","tags":[],"capabilities":["x402-payment","usdc-base","pay-per-request","post-endpoint","no-api-key","no-rate-limit"],"categories":["api-platform","finance"],"synonyms":["x402 API","pay-per-call API","USDC micropayment API","Base network API","lowpaymentfee","premium API access","crypto-paid API"],"warnings":["No documentation available: /docs, /api, /pricing, and /README pages are all empty beyond a 'Connect wallet' prompt.","No OpenAPI or request/response schema provided — it is unknown what this endpoint accepts or returns.","The specific endpoint /api/v1/transactions/324 is not listed on the landing page catalog; its purpose is unclear.","Functionality behind 'Premium API Access' is unverified — proceed with caution."],"endpointUrl":"https://lowpaymentfee.com/api/v1/transactions/324","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/324","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.300","qualityRationale":"The x402 challenge is live and confirms pricing ($0.02 USDC on Base), but there is zero documentation for this endpoint — no OpenAPI schema, no request/response examples, and no description of what the endpoint actually returns. The /docs, /pricing, and /README pages are all blank beyond a wallet-connect 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'/api/v1/transactions/324':84 '/docs':170 '/pricing':172 '/readme':174 '/request':13,28 '0.02':12,27,59,105 '000':100 '20':99 '6':110 'Base network API' 'USDC micropayment API' 'accept':206,227 'access':90 'actual':210 'advertis':116 'ai':126 'ai/ml':49 'analysi':130 'analyt':48,120 'api':5,20,37,71,89 'appear':153 'base':8,23,67,101,113 'behind':212 'beyond':162 'broad':42 'call':4,19 'catalog':43 'categori':117 'challeng':95,220 'classif':133 'commit':78 'confirm':221 'connect':180 'convers':149 'cost':58 'crypto-paid API' 'data':47,52,119,123,244 'decim':111 'describ':200 'detail':187 'determin':242 'difficult':240 'document':161,199,237 'embed':134 'empti':168 'enabl':36 'endpoint':45,57,82,152,205,215,223 'essenti':167 'estim':144 'everi':56 'exampl':196 'exchang':139 'export':124 'feed':138 'financ':135 'finance/web3':51 'follow':155 'function':211 'gas':143 'gate':230 'generat':150 'geocod':147 'howev':160 'includ':118 'infer':50 'infrastructur':54,146 'insight':125 'key':72 'lack':235 'land':164 'learn':128 'limit':75 'list':86 'live':225 'lowpaymentfee' 'lowpaymentfee.com':31 'machin':127 'make':238 'metric':121 'model':159 'network':9,24,68 'no-api-key' 'no-rate-limit' 'offer':40 'openapi':192 'page':165,175 'paid':62 'particular':203 'pay':2,17 'pay-per-cal':1,16 'pay-per-call API' 'pay-per-request' 'payment':229 'payment-g':228 'per':3,18,60 'platform':6,21,38,115 'post':231 'post-endpoint' 'premium':88 'premium API access' 'price':137,158 'prompt':182 'provid':248 'quot':142 'rate':74,140 'render':177 'report':122 'request':61,96,232 'request/response':195 'requir':79 'return':92,208,250 'schema':193 'sentiment':129 'servic':246 'sinc':107 'span':46 'specif':81,214 'summar':132 'technic':186 'text':131 'token':141 'transact':204 'unclear':217 'unit':102 'usd':106 'usdc':15,30,64,104,108 'usdc-base' 'use':109 'util':55 'valid':148 'via':10,25 'wallet':181 'web3':136 'x402':11,26,35,94,219 'x402 API' 'x402-enabled':34 'x402-payment'","prices":[{"id":"27a41b68-5727-4591-8550-61bfdf2d3a57","listingId":"0f65cbcc-0170-4b93-baa8-96efaa2c54de","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/transactions/324","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T19:26:07.700Z"}],"sources":[{"listingId":"0f65cbcc-0170-4b93-baa8-96efaa2c54de","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/transactions/324","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T19:26:07.700Z","lastSeenAt":"2026-04-23T13:01:59.598Z"}],"details":{"listingId":"0f65cbcc-0170-4b93-baa8-96efaa2c54de","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/transactions/324 \\\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 an x402 challenge requesting up to 20,000 base units of USDC (asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base network","source_url":"https://lowpaymentfee.com/api/v1/transactions/324"},{"claim":"All listed endpoints cost $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 in Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"},{"claim":"The /docs, /pricing, /api, and /README pages render only a 'Connect wallet' prompt with no further content","source_url":"https://lowpaymentfee.com/docs"}],"useCases":["Accessing premium API data with per-request USDC micropayments on Base","Agent-driven workflows that need keyless, pay-as-you-go API access","Programmatic access to transaction-related data without subscription commitments"],"bestFor":["Developers who want zero-signup, pay-per-call API access","AI agents with x402-compatible wallets on Base","Users who prefer crypto micropayments over traditional API key billing"],"notFor":["Users who need detailed API documentation and request/response schemas before integrating","High-volume consumers who would benefit from bulk pricing or subscriptions","Users without a Base-network USDC wallet"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:38.797Z"},"updatedAt":"2026-04-23T13:01:59.598Z"}}