{"id":"7124bd04-1054-44f9-8b01-ca53c0d2b292","shortId":"UEtMw9","kind":"x402","title":"Pay-per-request API collection on Base via x402 — data, AI, finance, and utility endpoints at $0.02/call.","tagline":"Pay-per-request API collection on Base via x402 — data, AI, finance, and utility endpoints at $0.02/call.","description":"lowpaymentfee.com hosts a collection of pay-per-request API endpoints accessible via the x402 payment protocol on the Base network. The specific endpoint at `/api/v1/collections/8` is labeled \"Premium API Access\" and charges up to 20,000 base units of USDC (0x8335…2913 on Base), which equals $0.02 per request. Payment is settled on-chain with no API keys, no rate limits, and no upfront commitments required.\n\nThe broader platform advertises four categories of endpoints: 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 listed endpoints share the same $0.02/request pricing. The `/api/v1/collections/8` endpoint likely serves as an aggregated or bundled access point, though the exact response payload is undocumented.\n\nDocumentation is extremely sparse — the docs, pricing, API, and README pages all render only a \"Connect wallet\" prompt with no further technical detail. There is no OpenAPI spec, no request/response schema documentation, and no usage examples available from the crawled material. The endpoint is confirmed live (returns a valid x402 402 challenge), but without documentation it is difficult to know what data or functionality this specific collections endpoint returns.","tags":[],"capabilities":["x402-payment","pay-per-request","usdc-base","no-api-key","data-analytics","ai-inference","finance-data","utility-services"],"categories":["api-marketplace","data","llm"],"synonyms":["x402 API","pay-per-call API","micropayment API","Base USDC API","lowpaymentfee","crypto-paid API","on-chain API access"],"warnings":["No API documentation available — docs, pricing, API, and README pages all show only 'Connect wallet'","No OpenAPI or schema definition for request or response payloads","The specific functionality of /api/v1/collections/8 ('Premium API Access') is unclear — it may be a bundle endpoint but this is unconfirmed","The platform lists many endpoint categories (AI, finance, data, utils) but none have documented schemas"],"endpointUrl":"https://lowpaymentfee.com/api/v1/collections/8","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/collections/8","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.350","qualityRationale":"The endpoint is confirmed live with a valid x402 402 challenge and clear pricing ($0.02 USDC on Base). However, there is no OpenAPI spec, no request/response schema, no documentation beyond a wallet-connect prompt, and no examples. The actual functionality behind '/api/v1/collections/8' is undocumented, making this effectively a stub 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'/call':19,38 '/request':155 '0.02':18,37,86,154 '000':75 '0x8335':80 '20':74 '2913':81 '402':226 'Base USDC API' 'access':50,69,167 'advertis':110 'aggreg':164 'ai':12,31,122 'ai-inference' 'analysi':126 'analyt':116 'api':5,24,48,68,97,183 'avail':212 'base':8,27,58,76,83 'broader':108 'bundl':166 'categori':112 'chain':94 'challeng':227 'charg':71 'classif':129 'collect':6,25,42,242 'commit':105 'confirm':220 'connect':191 'convers':146 'crawl':215 'crypto-paid API' 'data':11,30,115,119,237 'data-analytics' 'detail':198 'difficult':233 'doc':181 'document':176,207,230 'embed':130 'endpoint':16,35,49,62,114,150,159,218,243 'equal':85 'estim':140 'exact':171 'exampl':211 'exchang':135 'export':120 'extrem':178 'feed':134 'financ':13,32,131 'finance-data' 'four':111 'function':239 'gas':139 'generat':147 'geocod':144 'host':40 'infrastructur':142 'insight':121 'key':98 'know':235 'label':66 'learn':124 'like':160 'limit':101 'list':149 'live':221 'lowpaymentfee' 'lowpaymentfee.com':39 'machin':123 'materi':216 'metric':117 'micropayment API' 'network':59 'no-api-key' 'on-chain':92 'on-chain API access' 'openapi':202 'page':186 'pay':2,21,45 'pay-per-call API' 'pay-per-request':1,20,44 'payload':173 'payment':54,89 'per':3,22,46,87 'platform':109 'point':168 'premium':67 'price':133,156,182 'prompt':193 'protocol':55 'quot':138 'rate':100,136 'readm':185 'render':188 'report':118 'request':4,23,47,88 'request/response':205 'requir':106 'respons':172 'return':222,244 'schema':206 'sentiment':125 'serv':161 'settl':91 'share':151 'spars':179 'spec':203 'specif':61,241 'summar':128 'technic':197 'text':127 'though':169 'token':137 'undocu':175 'unit':77 'upfront':104 'usag':210 'usdc':79 'usdc-base' 'util':15,34,143 'utility-services' 'valid':145,224 'via':9,28,51 'wallet':192 'web3':132 'without':229 'x402':10,29,53,225 'x402 API' 'x402-payment'","prices":[{"id":"d3debcb6-b287-4ef9-a085-dd64b78666fe","listingId":"7124bd04-1054-44f9-8b01-ca53c0d2b292","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/collections/8","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-19T05:29:53.482Z"}],"sources":[{"listingId":"7124bd04-1054-44f9-8b01-ca53c0d2b292","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/collections/8","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-19T05:29:53.482Z","lastSeenAt":"2026-04-22T07:01:49.862Z"}],"details":{"listingId":"7124bd04-1054-44f9-8b01-ca53c0d2b292","quickStartSnippet":"# The endpoint requires an x402 payment header. First, probe for the challenge:\ncurl -X POST https://lowpaymentfee.com/api/v1/collections/8\n# Returns 402 with x402 challenge. Use an x402-compatible client to attach\n# the payment header (USDC on Base, max $0.02) and re-send the POST request.","exampleRequest":null,"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"The endpoint returns a valid x402 402 challenge with maxAmountRequired of 20000 base units of USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/collections/8"},{"claim":"USDC asset address is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base network","source_url":"https://lowpaymentfee.com/api/v1/collections/8"},{"claim":"Platform advertises $0.02/request pricing with no API keys, no rate limits, and instant access","source_url":"https://lowpaymentfee.com"},{"claim":"Four endpoint categories are listed: Data & Analytics, AI & Machine Learning, Finance & Web3, and Infrastructure","source_url":"https://lowpaymentfee.com"}],"useCases":["Accessing data analytics, AI inference, or finance endpoints without signing up for API keys","Agent-driven workflows that need on-demand API calls settled via on-chain USDC micropayments","Prototyping integrations where per-request billing avoids subscription overhead"],"bestFor":["Developers wanting zero-signup, pay-as-you-go API access on Base","AI agents that can settle x402 payments autonomously","Low-volume or exploratory use cases where $0.02/request is cost-effective"],"notFor":["High-volume production workloads where per-request crypto settlement adds latency and cost","Users who need detailed API documentation, SLAs, or guaranteed uptime","Anyone without a Base-compatible USDC wallet"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:24.385Z"},"updatedAt":"2026-04-22T07:01:49.862Z"}}