{"id":"eaee7472-63ed-45e5-824f-6ab9b21ffac4","shortId":"M4vtkw","kind":"x402","title":"Pay-per-call premium API access on Base via x402 — $0.02/request in USDC.","tagline":"Pay-per-call premium API access on Base via x402 — $0.02/request in USDC.","description":"This endpoint at lowpaymentfee.com provides \"Premium API Access\" via the x402 payment protocol. It is one of many endpoints offered by the provider, which spans categories including data & analytics, AI & machine learning, finance & Web3, and infrastructure utilities. All endpoints are priced at $0.02 per request, payable in USDC on the Base network with no API keys, no rate limits, and no commitments required.\n\nThe specific endpoint `/api/v1/payments/340` returns a valid x402 challenge (HTTP 402) requesting payment of up to 20,000 base units of USDC (0x8335…2913 on Base), which equals $0.02 given USDC's 6 decimals. Payment is made via the `exact` scheme to wallet `0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3` with a 300-second timeout. The endpoint accepts POST requests and returns `application/json`.\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 description of what this particular endpoint actually returns or what input it expects beyond a POST body. The provider's landing page lists many other endpoints (metrics, reports, sentiment analysis, summarization, price feeds, geocoding, etc.) but does not clarify what `/api/v1/payments/340` specifically does. Treat this as a stub listing until more documentation becomes available.","tags":[],"capabilities":["x402-payment","usdc-base","pay-per-request","no-api-key","json-response","post-method"],"categories":["api-gateway","payments"],"synonyms":["lowpaymentfee","x402 API","pay-per-call API","USDC micropayment API","Base network API","premium API access"],"warnings":["No documentation available — docs, API, pricing, and README pages all show only 'Connect wallet' with no content.","No OpenAPI or schema describing request parameters or response format for /api/v1/payments/340.","The purpose of this specific endpoint (/api/v1/payments/340) is unclear; 'Premium API Access' is a generic label.","No request or response examples available anywhere in the crawl."],"endpointUrl":"https://lowpaymentfee.com/api/v1/payments/340","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/payments/340","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.250","qualityRationale":"The endpoint is live and returns a valid x402 challenge, but there is no documentation, no OpenAPI schema, no request/response examples, and no explanation of what this specific endpoint does. The docs pages are empty. This is effectively a 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'/request':13,28 '0.02':12,27,73,122 '000':111 '0x1a2b13e97f5f837c8f9fa1f95a1484b7c70d85f3':137 '0x8335':116 '20':110 '2913':117 '300':140 '402':104 '6':126 'Base network API' 'USDC micropayment API' 'accept':145 'access':7,22,38 'actual':189 'ai':60 'analysi':212 'analyt':59 'api':6,21,37,85,157 'application/json':150 'avail':236 'base':9,24,81,112,119 'becom':235 'beyond':196 'bodi':199 'call':4,19 'categori':56 'challeng':102 'clarifi':221 'commit':92 'connect':166 'content':172 'data':58 'decim':127 'descript':183 'doc':156 'document':151,234 'endpoint':32,49,69,96,144,188,208 'equal':121 'etc':217 'exact':133 'exampl':180 'expect':195 'extrem':153 'feed':215 'financ':63 'geocod':216 'given':123 'http':103 'includ':57 'infrastructur':66 'input':193 'json-response' 'key':86 'land':203 'learn':62 'limit':89 'list':205,231 'lowpaymentfee' 'lowpaymentfee.com':34 'machin':61 'made':130 'mani':48,206 'metric':209 'network':82 'no-api-key' 'offer':50 'one':46 'openapi':176 'page':161,204 'particular':187 'pay':2,17 'pay-per-cal':1,16 'pay-per-call API' 'pay-per-request' 'payabl':76 'payment':42,106,128 'per':3,18,74 'post':146,198 'post-method' 'premium':5,20,36 'premium API access' 'price':71,158,214 'prompt':168 'protocol':43 'provid':35,53,201 'rate':88 'readm':160 'render':163 'report':210 'request':75,105,147 'request/response':179 'requir':93 'return':98,149,190 'schema':177 'scheme':134 'second':141 'sentiment':211 'span':55 'spars':154 'specif':95,224 'stub':230 'summar':213 'timeout':142 'treat':226 'unit':113 'usdc':15,30,78,115,124 'usdc-base' 'util':67 'valid':100 'via':10,25,39,131 'wallet':136,167 'web3':64 'x402':11,26,41,101 'x402 API' 'x402-payment'","prices":[{"id":"394d0cc4-10fe-4762-bd58-2a8f96c212c0","listingId":"eaee7472-63ed-45e5-824f-6ab9b21ffac4","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/payments/340","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:50:28.975Z"}],"sources":[{"listingId":"eaee7472-63ed-45e5-824f-6ab9b21ffac4","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/payments/340","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:50:28.975Z","lastSeenAt":"2026-04-23T11:03:35.017Z"}],"details":{"listingId":"eaee7472-63ed-45e5-824f-6ab9b21ffac4","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/payments/340 \\\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/payments/340"},{"claim":"Provider offers endpoints across data & analytics, AI & ML, finance & Web3, and infrastructure categories.","source_url":"https://lowpaymentfee.com"}],"useCases":["Accessing premium API functionality with per-request USDC micropayments on Base","Agent-driven API consumption without pre-registration or API keys","Testing x402 payment protocol integrations"],"bestFor":["Developers experimenting with x402 pay-per-call patterns","Agents that need keyless, on-demand API access settled in USDC on Base","Low-commitment API usage with no minimums or subscriptions"],"notFor":["Users who need detailed documentation or guaranteed SLAs before integrating","High-volume use cases where per-request crypto payments add unacceptable latency"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:06.92Z"},"updatedAt":"2026-04-23T11:03:35.017Z"}}