{"id":"4065edda-3d01-4495-97c1-76f52fe3152b","shortId":"P3AyZe","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 on the platform, which offers a broad catalog of pay-per-request APIs spanning data & analytics, 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, settled in USDC on the Base network.\n\nThe specific endpoint `/api/v1/payments/73` is labeled \"Premium API Access\" but its exact functionality is not documented beyond that label. The x402 challenge confirms it is live, accepts POST requests, and requires a 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 x402 exact scheme with a 300-second timeout. No API keys or rate limits are advertised — access is gated purely by micropayment.\n\nDocumentation is extremely thin. The docs, API, pricing, and README pages all render only a \"Connect wallet\" prompt with no additional content. There is no OpenAPI spec, no request/response schema, and no usage examples available from the crawled material. The platform's landing page lists the catalog and pricing but provides no detail on request formats or response payloads for any endpoint, including this one.","tags":[],"capabilities":["x402-payment","usdc-micropayment","base-network","pay-per-request","no-api-key","post-endpoint"],"categories":["api-gateway","payments"],"synonyms":["lowpaymentfee","x402 api","micropayment api","pay-per-call api","USDC api access","base network api","premium api"],"warnings":["No documentation available — docs, API, pricing, and README pages all show only 'Connect wallet'","No OpenAPI or request/response schema provided for this or any endpoint on the platform","The specific functionality of /api/v1/payments/73 ('Premium API Access') is undefined — it is unclear what data or service it provides","The broader platform lists many endpoints but none have documented request formats or response payloads"],"endpointUrl":"https://lowpaymentfee.com/api/v1/payments/73","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/73","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 pricing and payment details. However, there is no documentation, no OpenAPI spec, no request/response schema, and no explanation of what 'Premium API Access' actually returns. The docs pages are empty beyond a wallet-connect prompt. This is effectively a stub 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'/request':13,28 '0.02':12,27,98,156 '000':145 '0x8335':150 '20':144 '2913':151 '300':172 '6':160 'USDC api access' 'accept':134 'access':7,22,38,116,183 'addit':209 'advertis':182 'ai':67 'analysi':71 'analyt':66 'api':6,21,37,63,115,176,195 'avail':223 'base':9,24,106,146,153 'base network api' 'base-network' 'beyond':124 'broad':56 'call':4,19 'catalog':57,235 'challeng':129 'classif':74 'confirm':130 'connect':204 'content':210 'convers':91 'crawl':226 'data':65 'decim':161 'detail':241 'doc':194 'document':123,189 'embed':75 'endpoint':32,49,94,110,250 'equal':155 'estim':85 'exact':119,168 'exampl':222 'exchang':80 'extrem':191 'feed':79 'financ':76 'format':244 'function':120 'gas':84 'gate':185 'generat':92 'geocod':89 'given':157 'includ':251 'infrastructur':87 'key':177 'label':113,126 'land':231 'learn':69 'limit':180 'list':233 'live':133 'lowpaymentfee' 'lowpaymentfee.com':34 'machin':68 'made':164 'mani':48 'materi':227 'micropay':188 'micropayment api' 'network':107 'no-api-key' 'offer':54 'one':46,253 'openapi':214 'page':199,232 'pay':2,17,60 'pay-per-cal':1,16 'pay-per-call api' 'pay-per-request':59 'payload':247 'payment':42,140,162 'per':3,18,61,99 'platform':52,229 'post':135 'post-endpoint' 'premium':5,20,36,114 'premium api' 'price':78,96,196,237 'prompt':206 'protocol':43 'provid':35,239 'pure':186 'quot':83 'rate':81,179 'readm':198 'render':201 'request':62,100,136,243 'request/response':217 'requir':138 'respons':246 'schema':218 'scheme':169 'second':173 'sentiment':70 'settl':101 'span':64 'spec':215 'specif':109 'summar':73 'text':72 'thin':192 'timeout':174 'token':82 'unit':147 'usag':221 'usdc':15,30,103,149,158 'usdc-micropayment' 'util':88 'valid':90 'via':10,25,39,165 'wallet':205 'web3':77 'x402':11,26,41,128,167 'x402 api' 'x402-payment'","prices":[{"id":"21a98332-9c19-419e-9d2a-077ffb845b08","listingId":"4065edda-3d01-4495-97c1-76f52fe3152b","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/73","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:50:47.105Z"}],"sources":[{"listingId":"4065edda-3d01-4495-97c1-76f52fe3152b","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/payments/73","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:50:47.105Z","lastSeenAt":"2026-04-23T09:31:17.876Z"}],"details":{"listingId":"4065edda-3d01-4495-97c1-76f52fe3152b","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/payments/73 \\\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 x402 challenge with maxAmountRequired of 20000 base units of USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/payments/73"},{"claim":"All endpoints on the platform are priced at $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 APIs across Data & Analytics, AI & Machine Learning, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"},{"claim":"Docs, API, pricing, and README pages render only a 'Connect wallet' prompt","source_url":"https://lowpaymentfee.com/docs"}],"useCases":["Programmatic access to a pay-per-request API without needing API keys or subscriptions","Agent-driven workflows that settle per-call costs in USDC on Base","Testing x402 payment protocol integrations with a low-cost endpoint"],"bestFor":["Developers exploring x402 micropayment-gated APIs","AI agents that need keyless, pay-as-you-go API access","Projects wanting to avoid subscription commitments for occasional API calls"],"notFor":["Users who need detailed API documentation or guaranteed SLAs before integrating","High-volume use cases where per-request pricing at $0.02 may not be cost-effective","Anyone without a Base-compatible USDC wallet"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:06.053Z"},"updatedAt":"2026-04-23T09:31:17.876Z"}}