{"id":"8a11d3cf-5f1a-416c-96a7-6ab76e886b86","shortId":"JTRheX","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 an x402-enabled API platform that offers a broad catalog of endpoints spanning data analytics, AI/ML inference, finance/Web3 data, and utility services. All endpoints are pay-per-request at $0.02 each, settled in USDC on the Base network. No API keys, no rate limits, and no subscriptions are required — callers simply attach an x402 payment header to each request.\n\nThe specific endpoint at `/api/v1/transfers/35` is listed as \"Premium API Access\" and advertises a maximum cost of 20,000 base units of USDC (0x8335…2913 on Base), which equals $0.02 given USDC's 6 decimals. The x402 challenge confirms the endpoint is live, accepts POST requests, and returns application/json. However, the exact functionality behind this particular `/transfers/35` path is not documented on the site — the landing page catalogs analytics, AI, finance, and utility endpoints but does not mention a \"transfers\" category.\n\nThe broader platform advertises 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. Documentation pages beyond the landing page returned only a \"Connect wallet\" prompt with no further content, so detailed request/response schemas for any endpoint are unavailable.","tags":[],"capabilities":["x402-payment","pay-per-request","usdc-settlement","base-network","json-api","no-api-key","post-method"],"categories":["api-platform","infrastructure"],"synonyms":["x402 API","micropayment API","pay-per-call API","USDC API","Base network API","lowpaymentfee","crypto-paid API"],"warnings":["The exact functionality of /api/v1/transfers/35 ('Premium API Access') is not described anywhere in the crawled content — the transfers category does not appear on the landing page.","All documentation pages (/docs, /api, /pricing, /README) returned only 'Connect wallet' with no usable content.","No OpenAPI spec, request schema, or response schema is available for any endpoint.","The broad catalog of endpoints listed on the homepage (AI, analytics, finance, utils) could not be verified beyond their listing — none were probed."],"endpointUrl":"https://lowpaymentfee.com/api/v1/transfers/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/transfers/35","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.350","qualityRationale":"The x402 challenge is live and confirms pricing and payment details, but the specific endpoint's purpose (\"transfers/35\") is undocumented. No OpenAPI schema, no request/response examples, and all doc pages beyond the landing page are empty. The listing is effectively a stub with confirmed 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'/request':13,28 '/transfers/35':150 '0.02':12,27,64,123,205 '000':112 '0x8335':117 '20':111 '2913':118 '6':127 'Base network API' 'USDC API' 'accept':137 'access':104 'advertis':106,178 'ai':163 'ai/ml':49 'analysi':182 'analyt':48,162 'api':5,20,37,74,103 'application/json':142 'attach':86 'base':8,23,71,113,120 'base-network' 'behind':147 'beyond':210 'broad':42 'broader':176 'call':4,19 'caller':84 'catalog':43,161 'categori':174 'challeng':131 'classif':185 'confirm':132 'connect':217 'content':223 'convers':197 'cost':109 'crypto-paid API' 'data':47,52,199 'decim':128 'detail':225 'document':154,208 'embed':186 'enabl':36 'endpoint':45,57,96,134,167,179,230 'equal':122 'estim':194 'exact':145 'exchang':189 'feed':188 'financ':164 'finance/web3':51 'function':146 'gas':193 'generat':200 'geocod':195 'given':124 'header':90 'howev':143 'infer':50 'json-api' 'key':75 'land':159,212 'limit':78 'list':100 'live':136 'lowpaymentfee' 'lowpaymentfee.com':31 'maximum':108 'mention':171 'micropayment API' 'network':9,24,72 'no-api-key' 'offer':40 'page':160,209,213 'particular':149 'path':151 'pay':2,17,60 'pay-per-cal':1,16 'pay-per-call API' 'pay-per-request':59 'payment':89 'per':3,18,61 'platform':6,21,38,177 'point':207 'post':138 'post-method' 'premium':102 'price':187,206 'prompt':219 'quot':192 'rate':77,190 'request':62,93,139 'request/response':226 'requir':83 'return':141,214 'schema':227 'sentiment':181 'servic':55 'settl':66 'simpli':85 'site':157 'span':46 'specif':95 'subscript':81 'summar':184 'text':183 'token':191 'transfer':173 'unavail':232 'unit':114 'usdc':15,30,68,116,125 'usdc-settlement' 'util':54,166 'valid':196 'via':10,25 'wallet':218 'x402':11,26,35,88,130 'x402 API' 'x402-enabled':34 'x402-payment'","prices":[{"id":"2fbe383f-f340-4d70-ba3e-ed7d561c6314","listingId":"8a11d3cf-5f1a-416c-96a7-6ab76e886b86","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/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":"2026-04-18T19:27:46.405Z"}],"sources":[{"listingId":"8a11d3cf-5f1a-416c-96a7-6ab76e886b86","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/transfers/35","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T19:27:46.405Z","lastSeenAt":"2026-04-23T00:32:30.434Z"}],"details":{"listingId":"8a11d3cf-5f1a-416c-96a7-6ab76e886b86","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/transfers/35 \\\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 (0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base, equaling $0.02.","source_url":"https://lowpaymentfee.com/api/v1/transfers/35"},{"claim":"Platform lists endpoints for analytics, AI/ML, finance/Web3, and infrastructure utilities.","source_url":"https://lowpaymentfee.com"}],"useCases":["Accessing premium API functionality with per-request USDC micropayments on Base","Agent-driven workflows that need keyless, on-demand API access","Programmatic data retrieval or utility calls without subscription commitments"],"bestFor":["Developers who want zero-commitment, pay-as-you-go API access","AI agents with x402-compatible payment capabilities","Users already holding USDC on Base who want frictionless API calls"],"notFor":["Users who need detailed API documentation or OpenAPI schemas before integrating","High-volume consumers who would benefit from bulk pricing or subscriptions","Developers without USDC on Base or unfamiliar with x402 payment flows"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:34.099Z"},"updatedAt":"2026-04-23T00:32:30.434Z"}}