{"id":"23d0351c-0385-4c7c-b9ae-b56a9a3d59af","shortId":"W6VW6R","kind":"x402","title":"Pay-per-request premium API access via x402 on Base network, $0.02/call in USDC.","tagline":"Pay-per-request premium API access via x402 on Base network, $0.02/call in USDC.","description":"This endpoint at lowpaymentfee.com provides \"Premium API Access\" via the x402 payment protocol on the Base network. The specific endpoint `/api/v1/collections/37` accepts POST requests and charges 20,000 base units of USDC (0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913), which equals $0.02 per request given USDC's 6 decimals.\n\nThe broader lowpaymentfee.com platform advertises multiple API categories including 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 with no API keys, no rate limits, and no minimum commitments required.\n\nThe specific functionality of the `/api/v1/collections/37` endpoint is not documented beyond the generic \"Premium API Access\" label. The endpoint is live and returns a valid x402 challenge. Payment settles in USDC on the Base L2 network to address 0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3 with a maximum timeout of 300 seconds.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","pay-per-request","no-api-key","post-method"],"categories":["api-marketplace","crypto"],"synonyms":["low payment fee","micropayment API","x402 API","pay per call","USDC API","Base network API","premium API access"],"warnings":["No documentation available for what this specific endpoint (/api/v1/collections/37) actually does or returns","All documentation pages (docs, pricing, README) render only 'Connect wallet' with no content","No request body schema or response schema documented","The endpoint name 'Premium API Access' is generic and uninformative"],"endpointUrl":"https://lowpaymentfee.com/api/v1/collections/37","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/37","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.350","qualityRationale":"The endpoint is live and returns a valid x402 challenge, but there is no documentation on what /api/v1/collections/37 actually returns, no request/response schema, and the docs/pricing/README pages all just show 'Connect wallet' with no useful content. The specific functionality behind this endpoint is entirely 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'/call':14,30 '0.02':13,29,68,123 '000':60 '0x1a2b13e97f5f837c8f9fa1f95a1484b7c70d85f3':176 '0x833589fcd6edb6e08f4c7c32d4f71b54bda02913':65 '20':59 '300':182 '6':74 'Base network API' 'USDC API' 'accept':54 'access':7,23,40,153 'address':175 'advertis':80 'ai':92 'analysi':96 'analyt':86 'api':6,22,39,82,128,152 'base':11,27,48,61,171 'base-network' 'beyond':148 'broader':77 'categori':83 'challeng':164 'charg':58 'classif':99 'commit':136 'convers':116 'data':85,89 'decim':75 'document':147 'embed':100 'endpoint':34,52,119,144,156 'equal':67 'estim':110 'exchang':105 'export':90 'feed':104 'financ':101 'function':140 'gas':109 'generat':117 'generic':150 'geocod':114 'given':71 'includ':84 'infrastructur':112 'insight':91 'key':129 'l2':172 'label':154 'learn':94 'limit':132 'live':158 'low payment fee' 'lowpaymentfee.com':36,78 'machin':93 'maximum':179 'metric':87 'micropayment API' 'minimum':135 'multipl':81 'network':12,28,49,173 'no-api-key' 'pay':2,18 'pay per call' 'pay-per-request':1,17 'payment':44,165 'per':3,19,69,124 'platform':79 'post':55 'post-method' 'premium':5,21,38,151 'premium API access' 'price':103,121 'protocol':45 'provid':37 'quot':108 'rate':106,131 'report':88 'request':4,20,56,70,125 'requir':137 'return':160 'second':183 'sentiment':95 'settl':166 'specif':51,139 'summar':98 'text':97 'timeout':180 'token':107 'unit':62 'usdc':16,32,64,72,168 'usdc-settlement' 'util':113 'valid':115,162 'via':8,24,41 'web3':102 'x402':9,25,43,163 'x402 API' 'x402-payment'","prices":[{"id":"6b793b6c-edc1-4f39-b7c2-2a6f711f148c","listingId":"23d0351c-0385-4c7c-b9ae-b56a9a3d59af","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/37","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-19T05:29:51.766Z"}],"sources":[{"listingId":"23d0351c-0385-4c7c-b9ae-b56a9a3d59af","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/collections/37","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-19T05:29:51.766Z","lastSeenAt":"2026-04-22T01:02:00.425Z"}],"details":{"listingId":"23d0351c-0385-4c7c-b9ae-b56a9a3d59af","quickStartSnippet":"# POST with x402 payment header (USDC on Base, $0.02)\ncurl -X POST https://lowpaymentfee.com/api/v1/collections/37 \\\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":"Endpoint charges 20000 base units of USDC (asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base network","source_url":"https://lowpaymentfee.com/api/v1/collections/37"},{"claim":"All endpoints priced at $0.02 per request with no API keys, no rate limits, instant access on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"Platform offers Data & Analytics, AI & ML, Finance & Web3, and Infrastructure API categories","source_url":"https://lowpaymentfee.com"}],"useCases":["Accessing premium data or services without API key registration","Making one-off API calls with instant USDC micropayments","Integrating pay-per-use endpoints into agent workflows"],"bestFor":["Developers wanting keyless API access with crypto micropayments","AI agents needing on-demand premium API calls without subscriptions","Users who prefer pay-as-you-go over monthly commitments"],"notFor":["Users without USDC on Base network","High-volume callers who would benefit from bulk pricing","Developers needing detailed documentation or guaranteed SLAs"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:24.491Z"},"updatedAt":"2026-04-22T01:02:00.425Z"}}