{"id":"a86058d0-b850-4dad-a7a7-c81c2bab544d","shortId":"Hs3Qqx","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 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/67` is listed as \"Premium API Access\" and returns a standard x402 402 challenge requesting up to 20,000 base units of USDC (0.02 USD) per call. No API keys or rate limits are advertised; callers simply attach an X-PAYMENT header with a valid x402 payment proof.\n\nThe broader platform advertises multiple API 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 utilities (geocoding, validation, conversion, generation). All endpoints are listed at the same $0.02 per request price point.\n\nHowever, the specific functionality behind `/api/v1/wire/67` 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 (402 challenge captured), but what it actually returns after payment is unknown from the available material.","tags":[],"capabilities":["x402-payment","usdc-base-network","pay-per-request","no-api-key","http-post"],"categories":["api-marketplace","crypto"],"synonyms":["x402 API","pay-per-call API","USDC API access","Base network API","micropayment API","lowpaymentfee"],"warnings":["The specific functionality of /api/v1/wire/67 is completely undocumented — 'Premium API Access' is the only description available.","All documentation pages (docs, pricing, README, api) returned only 'Connect wallet' with no usable content.","No OpenAPI schema or request/response examples are available.","It is unclear whether this endpoint is a proxy to one of the listed API categories or something else entirely."],"endpointUrl":"https://lowpaymentfee.com/api/v1/wire/67","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/67","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 via a valid x402 402 challenge, but there is zero documentation on what the endpoint actually does or returns. No OpenAPI schema, no request/response examples, and the docs pages are empty. The label 'Premium API Access' is generic and 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'/request':13,28 '0.02':12,27,79,153 '000':74 '20':73 '402':68,211 'Base network API' 'USDC API access' 'accept':46 'access':62,172 'actual':217 'addit':188 'advertis':90,108 'ai':120 'analysi':124 'analyt':114 'api':5,20,38,61,84,110,171 'attach':93 'avail':202,225 'base':8,23,51,75 'behind':162 'beyond':167 'broader':106 'call':4,19,82 'caller':91 'captur':213 'categori':111 'challeng':69,212 'classif':127 'confirm':209 'connect':183 'content':189 'convers':144 'crawl':205 'data':113,117 'detail':200 'doc':174 'document':166,201 'embed':128 'endpoint':55,147,207 'estim':138 'exampl':197 'exchang':133 'export':118 'feed':132 'financ':129 'function':161 'gas':137 'generat':145 'geocod':142 'header':98 'howev':158 'http-post' 'includ':112 'infrastructur':140 'insight':119 'key':85 'label':169 'learn':122 'limit':88 'list':58,149 'live':210 'lowpaymentfee' 'lowpaymentfee.com':31 'machin':121 'materi':226 'metric':115 'micropayment API' 'multipl':109 'network':9,24,52 'no-api-key' 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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/67","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T19:29:11.958Z"}],"sources":[{"listingId":"a86058d0-b850-4dad-a7a7-c81c2bab544d","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/wire/67","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T19:29:11.958Z","lastSeenAt":"2026-04-22T12:04:50.519Z"}],"details":{"listingId":"a86058d0-b850-4dad-a7a7-c81c2bab544d","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/wire/67 \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402-payment-proof>\"","exampleRequest":null,"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"Endpoint returns a 402 x402 challenge requesting up to 20,000 base units of USDC on Base network","source_url":"https://lowpaymentfee.com/api/v1/wire/67"},{"claim":"Platform advertises $0.02 per request with no API keys, no rate limits, and instant access","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset address 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base network","source_url":"https://lowpaymentfee.com/api/v1/wire/67"},{"claim":"Platform lists API categories including Data & Analytics, AI & ML, Finance & Web3, and Infrastructure","source_url":"https://lowpaymentfee.com"}],"useCases":["Accessing premium API data with per-request USDC micropayments","Agent-driven API consumption without pre-registration or API keys","Programmatic pay-as-you-go access to various utility endpoints"],"bestFor":["Developers who want keyless, pay-per-use API access","AI agents with x402-compatible wallets on Base","Users who prefer crypto micropayments over subscription billing"],"notFor":["Users 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