{"id":"6223d501-965a-404f-bd8c-5c9e87df33b6","shortId":"LxCtrt","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 set of endpoints across data analytics, AI/ML inference, finance/Web3, and infrastructure utilities. All endpoints are pay-per-request at $0.02 each, settled in USDC on the Base network. No API keys, rate limits, or subscriptions are required — callers simply attach an x402 payment header to each request.\n\nThe specific endpoint at `/api/v1/transactions/59` is listed as \"Premium API Access\" and its x402 challenge advertises a maxAmountRequired of 20,000 base units of USDC (0x8335… on Base), which equals $0.02 given USDC's 6 decimals. The endpoint accepts POST requests and returns application/json. The broader platform also advertises endpoints for sentiment analysis, text summarization, classification, embeddings, price feeds, exchange rates, token quotes, gas estimates, geocoding, validation, conversion, and generation — all at the same $0.02 price point.\n\nDocumentation is extremely sparse. The docs, API, pricing, and README pages all render only a \"Connect wallet\" prompt with no further content. There is no OpenAPI spec, no request/response schema documentation, and no example payloads available. The endpoint is confirmed live (returns a proper 402 x402 challenge), but without documentation it is unclear what input the `/api/v1/transactions/59` endpoint expects or what it returns.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","pay-per-request","no-api-key","json-response","post-method"],"categories":["api-platform","infrastructure"],"synonyms":["x402 API","pay-per-call API","USDC micropayment API","Base network API","lowpaymentfee","crypto-paid API","402 payment API"],"warnings":["No documentation available — all doc/pricing/API/README pages render only 'Connect wallet'","No OpenAPI or schema definition found for any endpoint","The specific purpose and expected input/output of /api/v1/transactions/59 is undocumented","The platform lists many endpoint categories but none have documented schemas or examples"],"endpointUrl":"https://lowpaymentfee.com/api/v1/transactions/59","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/59","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 x402 402 challenge, but documentation is effectively nonexistent — all doc pages show only 'Connect wallet'. There is no OpenAPI spec, no request/response schema, and no examples. The purpose of '/api/v1/transactions/59' specifically is unclear beyond the generic 'Premium API Access' 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'/request':13,28 '0.02':12,27,63,121,165 '000':111 '0x8335':116 '20':110 '402':212 '402 payment API' '6':125 'Base network API' 'USDC micropayment API' 'accept':129 'access':101 'across':46 'advertis':106,139 'ai/ml':49 'also':138 'analysi':143 'analyt':48 'api':5,20,37,73,100,174 'application/json':134 'attach':83 'avail':203 'base':8,23,70,112,118 'base-network' 'broad':42 'broader':136 'call':4,19 'caller':81 'challeng':105,214 'classif':146 'confirm':207 'connect':183 'content':189 'convers':158 'crypto-paid API' 'data':47 'decim':126 'doc':173 'document':168,198,217 'embed':147 'enabl':36 'endpoint':45,56,93,128,140,205,225 'equal':120 'estim':155 'exampl':201 'exchang':150 'expect':226 'extrem':170 'feed':149 'finance/web3':51 'gas':154 'generat':160 'geocod':156 'given':122 'header':87 'infer':50 'infrastructur':53 'input':222 'json-response' 'key':74 'limit':76 'list':97 'live':208 'lowpaymentfee' 'lowpaymentfee.com':31 'maxamountrequir':108 'network':9,24,71 'no-api-key' 'offer':40 'openapi':193 'page':178 'pay':2,17,59 'pay-per-cal':1,16 'pay-per-call API' 'pay-per-request':58 'payload':202 'payment':86 'per':3,18,60 'platform':6,21,38,137 'point':167 'post':130 'post-method' 'premium':99 'price':148,166,175 'prompt':185 'proper':211 'quot':153 'rate':75,151 'readm':177 'render':180 'request':61,90,131 'request/response':196 'requir':80 'return':133,209,230 'schema':197 'sentiment':142 'set':43 'settl':65 'simpli':82 'spars':171 'spec':194 'specif':92 'subscript':78 'summar':145 'text':144 'token':152 'unclear':220 'unit':113 'usdc':15,30,67,115,123 'usdc-settlement' 'util':54 'valid':157 'via':10,25 'wallet':184 'without':216 'x402':11,26,35,85,104,213 'x402 API' 'x402-enabled':34 'x402-payment'","prices":[{"id":"de787197-3998-4a6f-ade9-12d5aae53df1","listingId":"6223d501-965a-404f-bd8c-5c9e87df33b6","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/59","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T19:26:59.788Z"}],"sources":[{"listingId":"6223d501-965a-404f-bd8c-5c9e87df33b6","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/transactions/59","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T19:26:59.788Z","lastSeenAt":"2026-04-23T06:31:39.998Z"}],"details":{"listingId":"6223d501-965a-404f-bd8c-5c9e87df33b6","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/transactions/59 \\\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 with no API keys, rate limits, or minimums","source_url":"https://lowpaymentfee.com"},{"claim":"Endpoint accepts POST, returns application/json, settles in USDC on Base network","source_url":"https://lowpaymentfee.com/api/v1/transactions/59"},{"claim":"maxAmountRequired is 20000 base units of USDC (asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913)","source_url":"https://lowpaymentfee.com/api/v1/transactions/59"},{"claim":"Platform offers endpoints across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"}],"useCases":["Accessing premium API data without needing API keys or subscriptions","Making one-off API calls with per-request USDC micropayments on Base","Agent-driven workflows that need keyless, pay-as-you-go API access"],"bestFor":["Developers wanting zero-commitment, pay-per-use API access","AI agents that can settle x402 payments autonomously on Base","Users who prefer crypto micropayments over traditional API billing"],"notFor":["Users who need detailed API documentation or OpenAPI specs before integrating","High-volume use cases where per-request payment overhead is impractical","Users without access to USDC on the Base network"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:36.328Z"},"updatedAt":"2026-04-23T06:31:39.998Z"}}