{"id":"6a3e9b4a-7fe1-4045-9103-dd7640561df9","shortId":"DfqL9k","kind":"x402","title":"Pay-per-call API platform on Base via x402 — data, AI, finance, and utility endpoints at $0.02 each.","tagline":"Pay-per-call API platform on Base via x402 — data, AI, finance, and utility endpoints at $0.02 each.","description":"lowpaymentfee.com is an x402-enabled API platform that offers a broad catalog of pay-per-request endpoints across four 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 priced at $0.02 per request, paid in USDC on the Base network with no API keys, rate limits, or upfront commitments required.\n\nThe specific endpoint `/api/v1/wire/35` is listed as \"Premium API Access\" and returns a valid x402 challenge requesting up to 20,000 base units of USDC (0x8335…2913 on Base), which equals $0.02 given USDC's 6 decimals. Payment is made via the x402 exact scheme, with a 300-second timeout. The endpoint accepts HTTP POST and returns application/json.\n\nDocumentation is extremely sparse — the /docs, /pricing, /api, 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 usage examples available. The actual functionality behind `/api/v1/wire/35` (labeled generically as \"Premium API Access\") is unclear and does not map to any of the named endpoints on the landing page. Prospective users should be aware that without documentation, the request format and response structure must be discovered experimentally.","tags":[],"capabilities":["x402-payment","pay-per-request","usdc-base","data-analytics","ai-inference","sentiment-analysis","text-summarization","classification","embeddings","finance-data","geocoding","utility-apis"],"categories":["ai","data","finance","infrastructure"],"synonyms":["low payment fee","x402 api","pay per call api","micropayment api","base usdc api","cheap api access","no-auth api","crypto pay api"],"warnings":["No API documentation available — /docs, /pricing, /api, and /README pages all show only 'Connect wallet' with no content","The endpoint path /api/v1/wire/35 is labeled generically as 'Premium API Access' and does not map to any of the named endpoints on the landing page","No request or response schema is documented; input format and output structure are unknown","No OpenAPI specification or ai-plugin manifest found"],"endpointUrl":"https://lowpaymentfee.com/api/v1/wire/35","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/35","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.350","qualityRationale":"The endpoint is live and returns a valid x402 challenge with clear pricing ($0.02 USDC on Base). However, there is no OpenAPI spec, no request/response schema, no documentation beyond a landing page listing, and the specific endpoint '/api/v1/wire/35' does not correspond to any named service. Effectively a stub 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'/api/v1/wire/35':122,217 '/docs':182 '/pricing':183 '/readme':186 '0.02':18,37,99,150 '000':139 '0x8335':144 '20':138 '2913':145 '300':166 '6':154 'accept':171 'access':128,223 'across':58 'actual':214 'ai':12,31,68 'ai-inference' 'analysi':72 'analyt':62 'api':5,24,45,111,127,222 'application/json':176 'avail':212 'awar':244 'base':8,27,107,140,147 'base usdc api' 'behind':216 'broad':50 'call':4,23 'catalog':51 'categori':60 'challeng':134 'cheap api access' 'classif':75 'classification' 'commit':117 'connect':192 'content':198 'convers':92 'crypto pay api' 'data':11,30,61,65 'data-analytics' 'decim':155 'discov':256 'document':177,207,247 'embed':76 'embeddings' 'enabl':44 'endpoint':16,35,57,95,121,170,235 'equal':149 'estim':86 'exact':162 'exampl':211 'exchang':81 'experiment':257 'export':66 'extrem':179 'feed':80 'financ':13,32,77 'finance-data' 'format':250 'four':59 'function':215 'gas':85 'generat':93 'generic':219 'geocod':90 'geocoding' 'given':151 'http':172 'infrastructur':88 'insight':67 'key':112 'label':218 'land':238 'learn':70 'limit':114 'list':124 'low payment fee' 'lowpaymentfee.com':39 'machin':69 'made':158 'map':229 'metric':63 'micropayment api' 'must':254 'name':234 'network':108 'no-auth api' 'offer':48 'openapi':202 'page':187,239 'paid':102 'pay':2,21,54 'pay per call api' 'pay-per-cal':1,20 'pay-per-request':53 'payment':156 'per':3,22,55,100 'platform':6,25,46 'post':173 'premium':126,221 'price':79,97 'prompt':194 'prospect':240 'quot':84 'rate':82,113 'render':189 'report':64 'request':56,101,135,249 'request/response':205 'requir':118 'respons':252 'return':130,175 'schema':206 'scheme':163 'second':167 'sentiment':71 'sentiment-analysis' 'spars':180 'spec':203 'specif':120 'structur':253 'summar':74 'text':73 'text-summarization' 'timeout':168 'token':83 'unclear':225 'unit':141 'upfront':116 'usag':210 'usdc':104,143,152 'usdc-base' 'user':241 'util':15,34,89 'utility-apis' 'valid':91,132 'via':9,28,159 'wallet':193 'web3':78 'without':246 'x402':10,29,43,133,161 'x402 api' 'x402-enabled':42 'x402-payment'","prices":[{"id":"d24858ba-004a-429e-93c1-85f8d872e751","listingId":"6a3e9b4a-7fe1-4045-9103-dd7640561df9","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/35","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T19:29:02.266Z"}],"sources":[{"listingId":"6a3e9b4a-7fe1-4045-9103-dd7640561df9","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/wire/35","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T19:29:02.266Z","lastSeenAt":"2026-04-22T07:01:44.598Z"}],"details":{"listingId":"6a3e9b4a-7fe1-4045-9103-dd7640561df9","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/wire/35 \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402-payment-header>\" \\\n  -d '{}'","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":"Categories include Data & Analytics, AI & Machine Learning, Finance & Web3, and Infrastructure","source_url":"https://lowpaymentfee.com"},{"claim":"Payment is in USDC on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"x402 challenge returns maxAmountRequired of 20000 base units of USDC (asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base","source_url":"https://lowpaymentfee.com/api/v1/wire/35"}],"useCases":["Accessing AI inference (sentiment, summarization, classification, embeddings) without API key management","Fetching real-time financial data like token quotes, gas estimates, and exchange rates on a per-call basis","Running utility operations such as geocoding, validation, and data conversion with micropayments","Integrating pay-per-request data analytics into agent workflows"],"bestFor":["Developers wanting zero-signup, pay-as-you-go API access","AI agents that can settle x402 payments in USDC on Base","Projects needing low-cost, low-friction access to diverse utility endpoints"],"notFor":["Users who need detailed API documentation or guaranteed SLAs before integrating","Applications requiring high-throughput bulk access with volume discounts","Developers without a Base-compatible USDC wallet"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:30.428Z"},"updatedAt":"2026-04-22T07:01:44.598Z"}}