{"id":"6e8b344f-a760-4f13-a517-ca79b47142ab","shortId":"czZktX","kind":"x402","title":"x402-gated premium API access on Base, pay $0.02 per request in USDC — no API keys required.","tagline":"x402-gated premium API access on Base, pay $0.02 per request in USDC — no API keys required.","description":"lowpaymentfee.com is a pay-per-request API platform that uses the x402 protocol to gate access to a variety of endpoints spanning data & analytics, AI & machine learning, finance & Web3, and infrastructure utilities. Each call costs $0.02 in USDC on the Base network, with no API keys, rate limits, or upfront commitments required. Payment is handled inline via the X-PAYMENT header.\n\nThe specific endpoint `/api/v1/cards/72` is listed as \"Premium API Access\" and returns an x402 challenge requesting up to 20,000 base units of USDC (0x8335…2913 on Base), which equals $0.02. The endpoint accepts POST requests and returns application/json. The broader platform also offers endpoints for sentiment analysis, text summarization, classification, embeddings, price feeds, exchange rates, geocoding, validation, conversion, and data export — all at the same $0.02 per-call price point.\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 from the crawl. The actual functionality behind `/api/v1/cards/72` is unclear — the name \"Premium API Access\" and the path segment \"cards/72\" do not reveal what data or service is returned.","tags":[],"capabilities":["x402-payment","per-request-billing","usdc-base","no-api-key","json-response","post-method"],"categories":["api-gateway","payments"],"synonyms":["pay-per-call API","x402 API","micropayment API","USDC API access","Base network API","lowpaymentfee","402 payment required API"],"warnings":["No documentation available — /docs, /pricing, /api, and /README all show only 'Connect wallet' with no content.","The purpose of /api/v1/cards/72 ('Premium API Access') is completely undocumented; it is unclear what data or service this endpoint provides.","No OpenAPI spec or request/response schema is available.","No examples of successful responses exist in the crawl material."],"endpointUrl":"https://lowpaymentfee.com/api/v1/cards/72","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/cards/72","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.300","qualityRationale":"The endpoint is live and returns a valid x402 challenge, confirming it accepts USDC payments on Base at $0.02 per call. However, there is no documentation, no OpenAPI spec, no request/response schema, and no explanation of what /api/v1/cards/72 actually returns. The docs pages are all blank wallet-connect prompts. The listing is essentially a 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'/api/v1/cards/72':103,215 '/docs':177 '/pricing':178 '/readme':181 '0.02':10,28,73,130,166 '000':119 '0x8335':124 '20':118 '2913':125 '402 payment required API' 'Base network API' 'USDC API access' 'accept':133 'access':6,24,53,109,222 'actual':212 'ai':62 'also':142 'analysi':147 'analyt':61 'api':5,16,23,34,44,82,108,221 'application/json':138 'avail':207 'base':8,26,78,120,127 'behind':214 'broader':140 'call':71,169 'cards/72':227 'challeng':114 'classif':150 'commit':88 'connect':187 'content':193 'convers':158 'cost':72 'crawl':210 'data':60,160,232 'document':172,202 'embed':151 'endpoint':58,102,132,144 'equal':129 'exampl':206 'exchang':154 'export':161 'extrem':174 'feed':153 'financ':65 'function':213 'gate':3,21,52 'geocod':156 'handl':92 'header':99 'infrastructur':68 'inlin':93 'json-response' 'key':17,35,83 'learn':64 'limit':85 'list':105 'lowpaymentfee' 'lowpaymentfee.com':37 'machin':63 'micropayment API' 'name':219 'network':79 'no-api-key' 'offer':143 'openapi':197 'page':182 'path':225 'pay':9,27,41 'pay-per-call API' 'pay-per-request':40 'payment':90,98 'per':11,29,42,168 'per-cal':167 'per-request-billing' 'platform':45,141 'point':171 'post':134 'post-method' 'premium':4,22,107,220 'price':152,170 'prompt':189 'protocol':50 'rate':84,155 'render':184 'request':12,30,43,115,135 'request/response':200 'requir':18,36,89 'return':111,137,236 'reveal':230 'schema':201 'segment':226 'sentiment':146 'servic':234 'span':59 'spars':175 'spec':198 'specif':101 'summar':149 'text':148 'unclear':217 'unit':121 'upfront':87 'usag':205 'usdc':14,32,75,123 'usdc-base' 'use':47 'util':69 'valid':157 'varieti':56 'via':94 'wallet':188 'web3':66 'x':97 'x-payment':96 'x402':2,20,49,113 'x402 API' 'x402-gated':1,19 'x402-payment'","prices":[{"id":"9497b03e-a897-4ad4-a8d0-6728dca7b742","listingId":"6e8b344f-a760-4f13-a517-ca79b47142ab","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/cards/72","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:43:47.930Z"}],"sources":[{"listingId":"6e8b344f-a760-4f13-a517-ca79b47142ab","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/cards/72","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:43:47.930Z","lastSeenAt":"2026-04-24T06:32:00.318Z"}],"details":{"listingId":"6e8b344f-a760-4f13-a517-ca79b47142ab","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/cards/72 \\\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":"The endpoint returns a 402 challenge requesting up to 20,000 base units of USDC on Base (asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913), equaling $0.02.","source_url":"https://lowpaymentfee.com/api/v1/cards/72"},{"claim":"The platform advertises $0.02 per request with no API keys, no rate limits, and instant access on the Base network.","source_url":"https://lowpaymentfee.com"},{"claim":"The platform offers endpoints across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories.","source_url":"https://lowpaymentfee.com"},{"claim":"The /docs, /pricing, /api, and /README pages render only a 'Connect wallet' prompt with no documentation content.","source_url":"https://lowpaymentfee.com/docs"}],"useCases":["Accessing premium API data with per-request USDC micropayments on Base","Agent-driven API consumption without pre-registration or API key management","Programmatic pay-as-you-go access to various utility and data endpoints"],"bestFor":["Developers wanting zero-signup, pay-per-use API access","AI agents that can settle x402 payments autonomously","Users comfortable with USDC on Base for micropayments"],"notFor":["Users who need detailed API documentation or schemas before integrating","Anyone requiring free or subscription-based access without crypto payments","Production workloads that need SLA guarantees or support"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:26.26Z"},"updatedAt":"2026-04-24T06:32:00.318Z"}}