{"id":"b2bf044c-3c28-47f0-97a1-e7dd79bb9b47","shortId":"VXurAe","kind":"x402","title":"Pay-per-call API platform on Base (USDC) covering data, AI, finance, and utility endpoints.","tagline":"Pay-per-call API platform on Base (USDC) covering data, AI, finance, and utility endpoints.","description":"lowpaymentfee.com is an x402-enabled API platform that offers a broad set of 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 via the x402 protocol.\n\nThe specific endpoint at `/api/v1/transfers/56` is listed as \"Premium API Access\" and carries a maximum charge of 20,000 base units of USDC (0.02 USDC, i.e., $0.02) per call. Payment is made by including an X-PAYMENT header; no API keys or account registration are required. The platform advertises no rate limits and instant access.\n\nDocumentation is extremely sparse — the /docs, /api, /pricing, and /README pages all render only a \"Connect wallet\" prompt with no further technical content. There is no OpenAPI specification, no request/response schema documentation, and no usage examples available from the crawled material. The exact functionality behind the `/api/v1/transfers/56` path is unclear; the name \"Premium API Access\" does not describe a specific capability. Prospective users should expect to experiment with the endpoint to determine its behavior.","tags":[],"capabilities":["x402-payment","usdc-base-network","pay-per-request","no-api-key","data-analytics","ai-inference","sentiment-analysis","text-summarization","classification","embeddings","finance-data","geocoding","utility-services"],"categories":["api-platform","ai","finance","data"],"synonyms":["low payment fee","x402 api","pay per call api","usdc api","base network api","micropayment api","crypto api access"],"warnings":["No OpenAPI or schema documentation available for any endpoint","The /docs, /pricing, /api, and /README pages contain no usable content (only 'Connect wallet')","The specific function of /api/v1/transfers/56 ('Premium API Access') is not described anywhere","Cannot verify what data or service is actually returned by this endpoint"],"endpointUrl":"https://lowpaymentfee.com/api/v1/transfers/56","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/transfers/56","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.350","qualityRationale":"The endpoint is live (402 challenge captured) and pricing is clear ($0.02 USDC on Base), but there is no OpenAPI schema, no request/response documentation, no examples, and the specific purpose of /api/v1/transfers/56 is undefined. Docs pages are empty beyond a wallet-connect 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'/api/v1/transfers/56':107,205 '/docs':164 '/pricing':166 '/readme':168 '0.02':89,126,129 '000':121 '20':120 'access':113,158,213 'account':146 'across':48 'advertis':152 'ai':12,28,58 'ai-inference' 'analysi':62 'analyt':52 'api':5,21,39,112,143,212 'avail':195 'base':8,24,97,122 'base network api' 'behavior':232 'behind':203 'broad':44 'call':4,20,131 'capabl':219 'carri':115 'categori':50 'charg':118 'classif':65 'classification' 'connect':174 'content':181 'convers':82 'cover':10,26 'crawl':198 'crypto api access' 'data':11,27,51,55 'data-analytics' 'describ':216 'determin':230 'document':159,190 'embed':66 'embeddings' 'enabl':38 'endpoint':16,32,47,85,105,228 'estim':76 'exact':201 'exampl':194 'exchang':71 'expect':223 'experi':225 'export':56 'extrem':161 'feed':70 'financ':13,29,67 'finance-data' 'four':49 'function':202 'gas':75 'generat':83 'geocod':80 'geocoding' 'header':141 'i.e':128 'includ':136 'infrastructur':78 'insight':57 'instant':157 'key':144 'learn':60 'limit':155 'list':109 'low payment fee' 'lowpaymentfee.com':33 'machin':59 'made':134 'materi':199 'maximum':117 'metric':53 'micropayment api' 'name':210 'network':98 'no-api-key' 'offer':42 'openapi':185 'page':169 'paid':92 'path':206 'pay':2,18 'pay per call api' 'pay-per-cal':1,17 'pay-per-request' 'payment':132,140 'per':3,19,90,130 'platform':6,22,40,151 'premium':111,211 'price':69,87 'prompt':176 'prospect':220 'protocol':102 'quot':74 'rate':72,154 'registr':147 'render':171 'report':54 'request':91 'request/response':188 'requir':149 'schema':189 'sentiment':61 'sentiment-analysis' 'set':45 'spars':162 'specif':104,186,218 'summar':64 'technic':180 'text':63 'text-summarization' 'token':73 'unclear':208 'unit':123 'usag':193 'usdc':9,25,94,125,127 'usdc api' 'usdc-base-network' 'user':221 'util':15,31,79 'utility-services' 'valid':81 'via':99 'wallet':175 'web3':68 'x':139 'x-payment':138 'x402':37,101 'x402 api' 'x402-enabled':36 'x402-payment'","prices":[{"id":"09fdfd64-a886-4cba-ab24-0571d8c75965","listingId":"b2bf044c-3c28-47f0-97a1-e7dd79bb9b47","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/transfers/56","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T19:28:02.068Z"}],"sources":[{"listingId":"b2bf044c-3c28-47f0-97a1-e7dd79bb9b47","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/transfers/56","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T19:28:02.068Z","lastSeenAt":"2026-04-22T09:01:49.221Z"}],"details":{"listingId":"b2bf044c-3c28-47f0-97a1-e7dd79bb9b47","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/transfers/56 \\\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":"All endpoints priced at $0.02 per request with no API keys, no rate limits, and instant access on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"x402 challenge returns maxAmountRequired of 20000 base units of USDC (0.02 USD) on Base","source_url":"https://lowpaymentfee.com/api/v1/transfers/56"},{"claim":"Platform offers endpoints in Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset address 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base network","source_url":"https://lowpaymentfee.com/api/v1/transfers/56"}],"useCases":["Accessing AI inference endpoints (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"],"bestFor":["Developers wanting zero-signup, pay-per-use API access","Agents or bots that can settle USDC payments on Base automatically","Projects needing lightweight access to multiple API categories without subscriptions"],"notFor":["Users who need detailed API documentation or OpenAPI specs before integrating","High-volume consumers who would benefit from bulk pricing or rate-limited tiers","Anyone without a Base-compatible USDC wallet"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:33.367Z"},"updatedAt":"2026-04-22T09:01:49.221Z"}}