{"id":"5280069a-9e60-4039-8eec-973b33d9b55b","shortId":"qV5D52","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 variety of endpoints across data analytics, AI/ML inference, finance/Web3 data, and utility services. All endpoints are pay-per-request at $0.02 each, settled in USDC on the Base network. No API keys, accounts, or rate limits are required — callers simply attach an x402 payment header to each request.\n\nThe specific endpoint at `/api/v1/transactions/138` is listed as \"Premium API Access\" and its x402 challenge advertises a maxAmountRequired of 20,000 base units of USDC (0x8335…2913 on Base), which equals $0.02. The platform also exposes endpoints for sentiment analysis, text summarization, classification, embeddings, price feeds, exchange rates, token quotes, gas estimates, geocoding, validation, conversion, and data generation — all at the same $0.02 price point.\n\nDocumentation is extremely sparse. The docs, pricing, API, and README pages all render only a \"Connect wallet\" prompt with no further content. There is no OpenAPI schema, no request/response examples, and no description of what the `/api/v1/transactions/138` endpoint actually returns. The endpoint is confirmed live (returns a proper 402 challenge), but without documentation it is unclear what data or functionality this specific route provides.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","pay-per-request","no-api-key","no-rate-limit"],"categories":["api-platform","finance","ai"],"synonyms":["x402 API","micropayment API","pay-per-call API","USDC API","Base network API","lowpaymentfee"],"warnings":["No documentation available — docs, pricing, API, and README pages all show only 'Connect wallet'","No OpenAPI schema or request/response examples provided","The purpose of /api/v1/transactions/138 ('Premium API Access') is completely undocumented — unclear what data or service it provides","Cannot verify what the endpoint actually returns upon successful payment"],"endpointUrl":"https://lowpaymentfee.com/api/v1/transactions/138","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/138","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.250","qualityRationale":"The endpoint is live and returns a valid x402 challenge, but there is zero documentation on what this specific endpoint does, what inputs it accepts, or what it returns. The docs/pricing/README pages are all blank beyond a wallet connect prompt. Effectively a stub 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'/request':13,28 '0.02':12,27,63,122,153 '000':111 '0x8335':116 '20':110 '2913':117 '402':204 'Base network API' 'USDC API' 'access':101 'account':75 'across':45 'actual':194 'advertis':106 'ai/ml':48 'also':125 'analysi':130 'analyt':47 'api':5,20,37,73,100,163 'attach':83 'base':8,23,70,112,119 'base-network' 'call':4,19 'caller':81 'challeng':105,205 'classif':133 'confirm':199 'connect':171 'content':177 'convers':145 'data':46,51,147,213 'descript':188 'doc':161 'document':156,208 'embed':134 'enabl':36 'endpoint':44,56,93,127,193,197 'equal':121 'estim':142 'exampl':185 'exchang':137 'expos':126 'extrem':158 'feed':136 'finance/web3':50 'function':215 'gas':141 'generat':148 'geocod':143 'header':87 'infer':49 'key':74 'limit':78 'list':97 'live':200 'lowpaymentfee' 'lowpaymentfee.com':31 'maxamountrequir':108 'micropayment API' 'network':9,24,71 'no-api-key' 'no-rate-limit' 'offer':40 'openapi':181 'page':166 'pay':2,17,59 'pay-per-cal':1,16 'pay-per-call API' 'pay-per-request':58 'payment':86 'per':3,18,60 'platform':6,21,38,124 'point':155 'premium':99 'price':135,154,162 'prompt':173 'proper':203 'provid':219 'quot':140 'rate':77,138 'readm':165 'render':168 'request':61,90 'request/response':184 'requir':80 'return':195,201 'rout':218 'schema':182 'sentiment':129 'servic':54 'settl':65 'simpli':82 'spars':159 'specif':92,217 'summar':132 'text':131 'token':139 'unclear':211 'unit':113 'usdc':15,30,67,115 'usdc-settlement' 'util':53 'valid':144 'varieti':42 'via':10,25 'wallet':172 'without':207 'x402':11,26,35,85,104 'x402 API' 'x402-enabled':34 'x402-payment'","prices":[{"id":"fff91420-63bf-4c8d-9faf-435601783dc7","listingId":"5280069a-9e60-4039-8eec-973b33d9b55b","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/138","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:58:30.958Z"}],"sources":[{"listingId":"5280069a-9e60-4039-8eec-973b33d9b55b","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/transactions/138","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:58:30.958Z","lastSeenAt":"2026-04-22T13:31:45.032Z"}],"details":{"listingId":"5280069a-9e60-4039-8eec-973b33d9b55b","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/transactions/138 \\\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":"All endpoints priced at $0.02 per request, no API keys, no rate limits, Base network","source_url":"https://lowpaymentfee.com"},{"claim":"x402 challenge returns maxAmountRequired of 20000 base units of USDC (asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base","source_url":"https://lowpaymentfee.com/api/v1/transactions/138"},{"claim":"Endpoint categories include Data & Analytics, AI & Machine Learning, Finance & Web3, and Infrastructure","source_url":"https://lowpaymentfee.com"}],"useCases":["Accessing API endpoints without creating accounts or managing API keys","Making one-off paid API calls from autonomous agents using x402","Paying for data or AI inference per-request with USDC on Base"],"bestFor":["Agents that need frictionless pay-per-call API access without signup","Developers experimenting with x402 payment protocol integrations","Use cases requiring low-cost, no-commitment API calls"],"notFor":["Production workloads requiring documented, stable API contracts","Users who need detailed request/response schemas before integrating","Anyone without a Base-network USDC wallet"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:43.907Z"},"updatedAt":"2026-04-22T13:31:45.032Z"}}