{"id":"e91e8501-fbc8-403d-b97d-f28f266e1c11","shortId":"eXLCAm","kind":"x402","title":"Pay-per-call API platform on Base (USDC) covering data, AI, finance, and utility endpoints at $0.02/request.","tagline":"Pay-per-call API platform on Base (USDC) covering data, AI, finance, and utility endpoints at $0.02/request.","description":"lowpaymentfee.com is an x402-enabled API platform that offers a broad catalog of pay-per-request endpoints settled in USDC on the Base network. The specific endpoint at `/api/v1/transactions/182` is listed as \"Premium API Access\" and costs up to $0.02 per call (20,000 base units of USDC with 6 decimals). Payment is handled via the x402 protocol — no API keys, no subscriptions, no rate limits. Callers attach an X-PAYMENT header with a signed USDC payment to the payTo address and receive a JSON response.\n\nThe broader platform advertises four endpoint families: 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/transactions/182` is not documented beyond the label \"Premium API Access.\" 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 (returns a valid 402 challenge), but what data or service it actually returns upon successful payment is unknown.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","pay-per-request","no-api-key","json-response"],"categories":["api-platform","finance","data"],"synonyms":["x402 API","pay-per-call API","USDC API","Base network API","micropayment API","lowpaymentfee","premium API access"],"warnings":["The specific functionality of /api/v1/transactions/182 ('Premium API Access') is not documented — it is unclear what data or service is returned upon payment.","All documentation pages (docs, pricing, README, api) returned only a 'Connect wallet' prompt with no substantive content.","No OpenAPI schema or request/response examples are available.","The endpoint path suggests a specific transaction record (ID 182) rather than a general-purpose API, but this is unconfirmed."],"endpointUrl":"https://lowpaymentfee.com/api/v1/transactions/182","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/182","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 there is no documentation, no OpenAPI schema, no request/response examples, and the actual functionality behind 'Premium API Access' at /api/v1/transactions/182 is completely undocumented. All doc pages returned only 'Connect wallet' with no 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'/request':19,38,176 '0.02':18,37,80,175 '000':84 '20':83 '402':235 '6':90 'Base network API' 'USDC API' 'access':75,193 'actual':243 'addit':209 'address':122 'advertis':131 'ai':12,31,142 'analysi':146 'analyt':136 'api':5,24,45,74,100,192 'attach':108 'avail':223 'base':8,27,63,85 'base-network' 'behind':183 'beyond':188 'broad':50 'broader':129 'call':4,23,82 'caller':107 'catalog':51 'challeng':236 'classif':149 'confirm':230 'connect':204 'content':210 'convers':166 'cost':77 'cover':10,29 'crawl':226 'data':11,30,135,139,239 'decim':91 'detail':221 'doc':195 'document':187,222 'embed':150 'enabl':44 'endpoint':16,35,57,67,133,169,228 'estim':160 'exampl':218 'exchang':155 'export':140 'famili':134 'feed':154 'financ':13,32,151 'four':132 'function':182 'gas':159 'generat':167 'geocod':164 'handl':94 'header':113 'howev':179 'infrastructur':162 'insight':141 'json':126 'json-response' 'key':101 'label':190 'learn':144 'limit':106 'list':71,171 'live':231 'lowpaymentfee' 'lowpaymentfee.com':39 'machin':143 'metric':137 'micropayment API' 'network':64 'no-api-key' 'offer':48 'openapi':214 'page':199 'pay':2,21,54 'pay-per-cal':1,20 'pay-per-call API' 'pay-per-request':53 'payment':92,112,118,247 'payto':121 'per':3,22,55,81 'platform':6,25,46,130 'point':178 'premium':73,191 'premium API access' 'price':153,177,196 'prompt':206 'protocol':98 'quot':158 'rate':105,156 'readm':198 'receiv':124 'report':138 'request':56 'request/response':217 'respons':127 'return':201,232,244 'schema':215 'sentiment':145 'servic':241 'settl':58 'sign':116 'specif':66,181 'subscript':103 'success':246 'summar':148 'text':147 'token':157 'unit':86 'unknown':249 'upon':245 'usdc':9,28,60,88,117 'usdc-settlement' 'util':15,34,163 'valid':165,234 'via':95 'wallet':205 'web3':152 'x':111 'x-payment':110 'x402':43,97 'x402 API' 'x402-enabled':42 'x402-payment'","prices":[{"id":"f73492b3-6391-4e8a-a65f-126542b1df5e","listingId":"e91e8501-fbc8-403d-b97d-f28f266e1c11","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/182","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:58:53.994Z"}],"sources":[{"listingId":"e91e8501-fbc8-403d-b97d-f28f266e1c11","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/transactions/182","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:58:53.994Z","lastSeenAt":"2026-04-23T20:03:09.744Z"}],"details":{"listingId":"e91e8501-fbc8-403d-b97d-f28f266e1c11","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/transactions/182 \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <signed-x402-payment-header>\"","exampleRequest":null,"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"The endpoint returns a valid x402 402 challenge with maxAmountRequired of 20000 base units of USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/transactions/182"},{"claim":"All endpoints are priced at $0.02/request with no API keys, no rate limits, and instant access on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"The platform offers Data & Analytics, AI & ML, Finance & Web3, and Infrastructure endpoint categories","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset address is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base","source_url":"https://lowpaymentfee.com/api/v1/transactions/182"}],"useCases":["Accessing premium data or transaction information via a single paid API call","Agent-driven workflows that need keyless, per-request API access settled on-chain","Programmatic access to various data, AI, finance, or utility services without subscriptions"],"bestFor":["Developers who want zero-setup, pay-as-you-go API access","AI agents that can settle USDC payments on Base via x402","Users who prefer on-chain micropayments over traditional API key management"],"notFor":["Users who need detailed documentation or guaranteed SLAs before purchasing","High-volume consumers who would benefit from bulk pricing or subscriptions","Anyone without a Base-compatible USDC wallet"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:42.757Z"},"updatedAt":"2026-04-23T20:03:09.744Z"}}