{"id":"9fef3989-3c22-4c93-b213-779f9f36166d","shortId":"GRS5fn","kind":"x402","title":"Pay-per-call API platform on Base via x402 — $0.02/request for data, AI, finance, and utility endpoints.","tagline":"Pay-per-call API platform on Base via x402 — $0.02/request for data, AI, finance, and utility endpoints.","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/wire/49` is listed as \"Premium API Access\" and charges up to 20,000 base units of USDC (i.e., $0.02 per call, since USDC uses 6 decimals). No API keys, rate limits, or subscriptions are required — each request is paid individually via an X-PAYMENT header.\n\nThe broader platform advertises multiple endpoint 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 sparse. The docs, API, pricing, and README pages all returned only a \"Connect wallet\" prompt with no substantive content. There is no OpenAPI schema, no request/response examples, and no description of what the `/api/v1/wire/49` endpoint specifically returns. The endpoint is confirmed live (returns a valid 402 x402 challenge), but without documentation it is unclear what data or functionality this particular route provides.","tags":[],"capabilities":["x402-payment","usdc-base","pay-per-request","no-api-key","http-post"],"categories":["api-platform","crypto"],"synonyms":["x402 API","pay per call API","USDC API","Base network API","micropayment API","lowpaymentfee","wire API"],"warnings":["No documentation available — docs, API, pricing, and README pages all return only 'Connect wallet' with no content.","No OpenAPI or schema describing request parameters or response format for /api/v1/wire/49.","The purpose of the specific '/api/v1/wire/49' endpoint is unknown; 'Premium API Access' is the only description provided.","Cannot verify what data or service is actually delivered upon successful payment."],"endpointUrl":"https://lowpaymentfee.com/api/v1/wire/49","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/wire/49","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.250","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 no description of what /api/v1/wire/49 actually returns. The docs pages are all empty 'Connect wallet' stubs. This is effectively a stub 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'/request':12,31,158 '0.02':11,30,82,157 '000':76 '20':75 '402':210 '6':88 'Base network API' 'USDC API' 'accept':54 'access':70 'advertis':113 'ai':15,34,124 'analysi':128 'analyt':118 'api':5,24,46,69,91,168 'base':8,27,59,77 'broader':111 'call':4,23,84 'categori':116 'challeng':212 'charg':72 'classif':131 'confirm':205 'connect':177 'content':183 'convers':148 'data':14,33,117,121,220 'decim':89 'descript':194 'doc':167 'document':162,215 'embed':132 'endpoint':19,38,63,115,151,199,203 'estim':142 'exampl':191 'exchang':137 'export':122 'extrem':164 'feed':136 'financ':16,35,133 'function':222 'gas':141 'generat':149 'geocod':146 'header':109 'howev':161 'http-post' 'i.e':81 'individu':103 'infrastructur':144 'insight':123 'key':92 'learn':126 'limit':94 'list':66,153 'live':206 'lowpaymentfee' 'lowpaymentfee.com':39 'machin':125 'metric':119 'micropayment API' 'multipl':114 'network':60 'no-api-key' 'openapi':187 'page':172 'paid':102 'particular':224 'pay':2,21,43 'pay per call API' 'pay-per-cal':1,20 'pay-per-request':42 'payment':56,108 'per':3,22,44,83 'platform':6,25,47,112 'point':160 'premium':68 'price':135,159,169 'prompt':179 'protocol':52 'provid':226 'quot':140 'rate':93,138 'readm':171 'report':120 'request':45,100 'request/response':190 'requir':98 'return':174,201,207 'rout':225 'schema':188 'sentiment':127 'sinc':85 'spars':165 'specif':62,200 'subscript':96 'substant':182 'summar':130 'text':129 'token':139 'unclear':218 'unit':78 'usdc':55,80,86 'usdc-base' 'use':49,87 'util':18,37,145 'valid':147,209 'via':9,28,104 'wallet':178 'web3':134 'wire API' 'without':214 'x':107 'x-payment':106 'x402':10,29,51,211 'x402 API' 'x402-payment'","prices":[{"id":"42f40cf8-c622-48dc-8cc9-7a6d19587b09","listingId":"9fef3989-3c22-4c93-b213-779f9f36166d","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/wire/49","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T19:29:08.895Z"}],"sources":[{"listingId":"9fef3989-3c22-4c93-b213-779f9f36166d","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/wire/49","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T19:29:08.895Z","lastSeenAt":"2026-04-22T17:02:24.784Z"}],"details":{"listingId":"9fef3989-3c22-4c93-b213-779f9f36166d","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/wire/49 \\\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 valid x402 challenge with maxAmountRequired of 20000 base units of USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/wire/49"},{"claim":"All listed 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 endpoints across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/wire/49"}],"useCases":["Programmatic access to API services without managing API keys or subscriptions","Agent-driven workflows that need on-demand paid endpoints settled in USDC on Base","Testing x402 protocol integrations with a low-cost endpoint"],"bestFor":["Developers wanting zero-friction API access with crypto micropayments","AI agents that can settle x402 payments autonomously","Users who prefer pay-as-you-go over subscription billing"],"notFor":["Users who need detailed API documentation or guaranteed SLAs before integrating","Anyone without a Base-network USDC wallet or x402-compatible client"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:30.182Z"},"updatedAt":"2026-04-22T17:02:24.784Z"}}