{"id":"254ac9ad-4b3c-40da-aecb-f0a1d024dadf","shortId":"gjJUJN","kind":"x402","title":"Pay-per-call API platform on Base network via x402 — $0.02/request, no API keys required.","tagline":"Pay-per-call API platform on Base network via x402 — $0.02/request, no API keys required.","description":"lowpaymentfee.com is an x402-enabled API platform that offers a broad catalog of endpoints spanning data analytics, AI/ML inference, finance/Web3 data, and utility services. Every endpoint is priced at $0.02 per request, paid in USDC on the Base network using the x402 payment protocol. There are no API keys, no rate limits, and no subscription commitments — callers simply attach an X-PAYMENT header with a valid x402 payment proof to access any endpoint.\n\nThe specific endpoint at `/api/v1/transfers/87` is listed as \"Premium API Access\" and accepts POST requests. Its x402 challenge advertises a maxAmountRequired of 20000 base units of USDC (0x8335…2913 on Base), which equals $0.02 given USDC's 6 decimals. The broader platform includes endpoints for sentiment analysis, text summarization, classification, embeddings, price feeds, exchange rates, token quotes, gas estimates, geocoding, validation, conversion, and data generation — all at the same $0.02 price point.\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 detailed descriptions of what each endpoint actually returns. The x402 challenge confirms the endpoint is live and accepting payment, but the actual functionality behind `/api/v1/transfers/87` specifically is unclear from available materials.","tags":[],"capabilities":["x402-payment","per-request-pricing","usdc-base-network","no-api-key","data-analytics","ai-inference","sentiment-analysis","text-summarization","classification","embeddings","finance-data","crypto-data","geocoding","utility-services"],"categories":["api-platform","ai","finance","infrastructure"],"synonyms":["pay-per-call API","x402 API","micropayment API","USDC API","Base network API","low fee API","serverless API access","crypto-paid API"],"warnings":["Documentation pages (/docs, /api, /pricing, /README) all return only a 'Connect wallet' prompt with no actual content","No OpenAPI or schema available — request and response formats are unknown","The specific functionality of /api/v1/transfers/87 ('Premium API Access') is not described anywhere","The broad catalog of endpoints listed on the homepage cannot be independently verified for functionality"],"endpointUrl":"https://lowpaymentfee.com/api/v1/transfers/87","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/87","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.350","qualityRationale":"The x402 challenge confirms the endpoint is live and pricing is clear ($0.02 USDC on Base). However, there is no OpenAPI schema, no request/response examples, and all documentation pages render only 'Connect wallet' with no useful content. The specific purpose of /api/v1/transfers/87 is undocumented beyond the generic 'Premium API Access' 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'/request':13,30 '0.02':12,29,65,143,179 '0x8335':137 '20000':132 '2913':138 '6':147 'Base network API' 'USDC API' 'accept':122,231 'access':107,120 'actual':220,235 'advertis':128 'ai-inference' 'ai/ml':53 'analysi':156 'analyt':52 'api':5,15,22,32,41,83,119,188 'attach':94 'avail':243 'base':8,25,73,133,140 'behind':237 'broad':46 'broader':150 'call':4,21 'caller':92 'catalog':47 'challeng':127,224 'classif':159 'classification' 'commit':91 'confirm':225 'connect':197 'content':203 'convers':171 'crypto-data' 'crypto-paid API' 'data':51,56,173 'data-analytics' 'decim':148 'descript':215 'detail':214 'doc':187 'document':182 'embed':160 'embeddings' 'enabl':40 'endpoint':49,61,109,112,153,219,227 'equal':142 'estim':168 'everi':60 'exampl':211 'exchang':163 'extrem':184 'feed':162 'finance-data' 'finance/web3':55 'function':236 'gas':167 'generat':174 'geocod':169 'geocoding' 'given':144 'header':99 'includ':152 'infer':54 'key':16,33,84 'limit':87 'list':116 'live':229 'low fee API' 'lowpaymentfee.com':35 'materi':244 'maxamountrequir':130 'micropayment API' 'network':9,26,74 'no-api-key' 'offer':44 'openapi':207 'page':192 'paid':68 'pay':2,19 'pay-per-cal':1,18 'pay-per-call API' 'payment':78,98,104,232 'per':3,20,66 'per-request-pricing' 'platform':6,23,42,151 'point':181 'post':123 'premium':118 'price':63,161,180,189 'prompt':199 'proof':105 'protocol':79 'quot':166 'rate':86,164 'readm':191 'render':194 'request':67,124 'request/response':210 'requir':17,34 'return':221 'schema':208 'sentiment':155 'sentiment-analysis' 'serverless API access' 'servic':59 'simpli':93 'span':50 'spars':185 'specif':111,239 'subscript':90 'summar':158 'text':157 'text-summarization' 'token':165 'unclear':241 'unit':134 'usdc':70,136,145 'usdc-base-network' 'use':75 'util':58 'utility-services' 'valid':102,170 'via':10,27 'wallet':198 'x':97 'x-payment':96 'x402':11,28,39,77,103,126,223 'x402 API' 'x402-enabled':38 'x402-payment'","prices":[{"id":"d0f7e6a2-7101-4ce2-a1c0-0ed0ff12cfe0","listingId":"254ac9ad-4b3c-40da-aecb-f0a1d024dadf","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/87","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T19:27:57.273Z"}],"sources":[{"listingId":"254ac9ad-4b3c-40da-aecb-f0a1d024dadf","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/transfers/87","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T19:27:57.273Z","lastSeenAt":"2026-04-22T09:01:49.023Z"}],"details":{"listingId":"254ac9ad-4b3c-40da-aecb-f0a1d024dadf","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/transfers/87 \\\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 402 with x402 challenge advertising 20000 base units of USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/transfers/87"},{"claim":"Platform advertises $0.02/request pricing with no API keys, no rate limits, and instant access on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset address is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base","source_url":"https://lowpaymentfee.com/api/v1/transfers/87"},{"claim":"Platform offers endpoints across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"}],"useCases":["Accessing AI inference endpoints (sentiment, summarization, classification, embeddings) without API key management","Fetching real-time crypto prices, gas estimates, and exchange rates on a per-call basis","Running geocoding, validation, or data conversion tasks with instant pay-per-use billing","Integrating pay-as-you-go data analytics and reporting into agent workflows"],"bestFor":["Agents or developers who want zero-signup, pay-per-call API access","Use cases requiring low-cost micropayments per request ($0.02)","Projects already operating on the Base network with USDC"],"notFor":["Users needing detailed API documentation or guaranteed SLAs before integrating","High-volume workloads where per-request crypto payment overhead is impractical","Users without access to USDC on Base network"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:33.614Z"},"updatedAt":"2026-04-22T09:01:49.023Z"}}