{"id":"c56780bd-07e6-4a3b-afd8-ff4a0fb61211","shortId":"2yKUkd","kind":"x402","title":"Pay-per-call premium API access on Base via x402 — $0.02/request in USDC.","tagline":"Pay-per-call premium API access on Base via x402 — $0.02/request in USDC.","description":"This endpoint at lowpaymentfee.com provides \"Premium API Access\" via the x402 payment protocol. The site hosts a broad catalog of pay-per-request APIs spanning data & analytics, AI/ML inference (sentiment analysis, summarization, classification, embeddings), finance & Web3 (price feeds, exchange rates, token quotes, gas estimates), and infrastructure utilities (geocoding, validation, conversion, generation). Each endpoint is priced at $0.02 per request, settled in USDC on the Base network.\n\nThe specific endpoint `/api/v1/wire/54` is listed as \"Premium API Access\" with a max amount of 20,000 base units of USDC (0.02 USDC = $0.02) per call. Payment is handled via the x402 exact scheme — callers attach an X-PAYMENT header with a signed payment to the payTo address. There are no API keys, no rate limits, and no minimum commitments advertised. The endpoint accepts HTTP POST and returns application/json.\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 schema, no request/response examples, and no description of what the `/api/v1/wire/54` endpoint specifically returns. The site's landing page lists many endpoints but does not clarify what \"Premium API Access\" at this particular path does. Prospective callers should be aware that without documentation or example payloads, integration requires experimentation or contacting the provider.","tags":[],"capabilities":["x402-payment","usdc-base","pay-per-request","http-post","json-response"],"categories":["api-marketplace","crypto"],"synonyms":["lowpaymentfee","x402 api","pay per call api","usdc api","base network api","micropayment api","premium api"],"warnings":["No documentation available — docs, API, pricing, and README pages all show only 'Connect wallet'","No OpenAPI or request/response schema provided","The specific function of /api/v1/wire/54 ('Premium API Access') is not described anywhere","Cannot verify what data or service this endpoint actually returns"],"endpointUrl":"https://lowpaymentfee.com/api/v1/wire/54","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/54","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.300","qualityRationale":"The endpoint is live (402 challenge captured) and pricing is clear ($0.02 USDC on Base), but there is no documentation, no OpenAPI schema, no request/response examples, and the specific purpose of /api/v1/wire/54 is undefined beyond the generic label 'Premium API Access'. Docs pages return only wallet-connect 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'/request':13,28 '0.02':12,27,88,119,121 '000':114 '20':113 'accept':162 'access':7,22,38,107,223 'address':146 'advertis':159 'ai/ml':59 'amount':111 'analysi':62 'analyt':58 'api':6,21,37,55,106,150,174,222 'application/json':167 'attach':133 'awar':233 'base':9,24,96,115 'base network api' 'broad':48 'call':4,19,123 'caller':132,230 'catalog':49 'clarifi':219 'classif':64 'commit':158 'connect':183 'contact':244 'content':189 'convers':81 'data':57 'descript':200 'doc':173 'document':168,236 'embed':65 'endpoint':32,84,100,161,205,215 'estim':75 'exact':130 'exampl':197,238 'exchang':70 'experiment':242 'extrem':170 'feed':69 'financ':66 'gas':74 'generat':82 'geocod':79 'handl':126 'header':138 'host':46 'http':163 'http-post' 'infer':60 'infrastructur':77 'integr':240 'json-response' 'key':151 'land':211 'limit':154 'list':103,213 'lowpaymentfee' 'lowpaymentfee.com':34 'mani':214 'max':110 'micropayment api' 'minimum':157 'network':97 'openapi':193 'page':178,212 'particular':226 'path':227 'pay':2,17,52 'pay per call api' 'pay-per-cal':1,16 'pay-per-request':51 'payload':239 'payment':42,124,137,142 'payto':145 'per':3,18,53,89,122 'post':164 'premium':5,20,36,105,221 'premium api' 'price':68,86,175 'prompt':185 'prospect':229 'protocol':43 'provid':35,246 'quot':73 'rate':71,153 'readm':177 'render':180 'request':54,90 'request/response':196 'requir':241 'return':166,207 'schema':194 'scheme':131 'sentiment':61 'settl':91 'sign':141 'site':45,209 'span':56 'spars':171 'specif':99,206 'summar':63 'token':72 'unit':116 'usdc':15,30,93,118,120 'usdc api' 'usdc-base' 'util':78 'valid':80 'via':10,25,39,127 'wallet':184 'web3':67 'without':235 'x':136 'x-payment':135 'x402':11,26,41,129 'x402 api' 'x402-payment'","prices":[{"id":"b55123b6-b4fb-48b3-be31-d39063f66ea4","listingId":"c56780bd-07e6-4a3b-afd8-ff4a0fb61211","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/54","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T19:29:13.753Z"}],"sources":[{"listingId":"c56780bd-07e6-4a3b-afd8-ff4a0fb61211","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/wire/54","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T19:29:13.753Z","lastSeenAt":"2026-04-22T12:04:50.630Z"}],"details":{"listingId":"c56780bd-07e6-4a3b-afd8-ff4a0fb61211","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/wire/54 \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <signed-x402-payment-header>\" \\\n  -d '{}'","exampleRequest":null,"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"Endpoint returns 402 with x402 challenge advertising USDC on Base, maxAmountRequired 20000 (=$0.02)","source_url":"https://lowpaymentfee.com/api/v1/wire/54"},{"claim":"Site lists APIs across data/analytics, AI/ML, finance/Web3, and infrastructure categories, all at $0.02/request","source_url":"https://lowpaymentfee.com"},{"claim":"No API keys, no rate limits, instant access advertised","source_url":"https://lowpaymentfee.com"},{"claim":"Docs, API, pricing, and README pages render only 'Connect wallet'","source_url":"https://lowpaymentfee.com/docs"}],"useCases":["Programmatic access to paid API endpoints without API key management","Agent-driven pay-per-call workflows settled in USDC on Base","Exploring x402 protocol integration for micropayment-gated services"],"bestFor":["Developers experimenting with x402 payment protocol","Agents that can sign USDC payments on Base L2","Users who want keyless, pay-as-you-go API access"],"notFor":["Users who need detailed API documentation or schemas before integrating","Applications requiring free or fiat-only payment methods","High-volume use cases where per-request pricing may add up"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:29.892Z"},"updatedAt":"2026-04-22T12:04:50.630Z"}}