{"id":"140130ca-d288-4d04-90a5-5b175587fd92","shortId":"zscRWx","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. The site hosts a broad catalog of pay-per-request APIs spanning data & analytics, AI/ML inference (sentiment analysis, 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, paid in USDC on the Base network with no API keys, no rate limits, and no commitments required.\n\nThe specific endpoint `/api/v1/charges/54` is labeled \"Premium API Access\" and returns a valid x402 challenge with a maxAmountRequired of 20,000 base units of USDC (0x8335…2913 on Base, 6 decimals), which equals $0.02. Payment is made via the x402 exact scheme to the specified payTo address. The endpoint accepts HTTP POST requests and returns application/json responses. A 300-second payment timeout is configured.\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 spec, no request/response schema documentation, and no examples of what this particular endpoint actually returns. The site's landing page lists many endpoints but provides no detail on request parameters or response formats. While the endpoint is confirmed live (402 challenge captured), the lack of documentation makes it difficult to know what data or functionality \"Premium API Access\" at `/api/v1/charges/54` actually provides.","tags":[],"capabilities":["x402-payment","usdc-base","pay-per-request","json-api","no-api-key","http-post"],"categories":["api","payment"],"synonyms":["x402 api","pay per call api","usdc api access","base network api","micropayment api","lowpaymentfee","premium api"],"warnings":["No documentation available — docs, API, pricing, and README pages all render only 'Connect wallet'","No OpenAPI or schema describing request parameters or response format for /api/v1/charges/54","The specific function of 'Premium API Access' at /api/v1/charges/54 is unclear — it does not map to any named endpoint on the landing page","Cannot verify what data or service is actually delivered after payment"],"endpointUrl":"https://lowpaymentfee.com/api/v1/charges/54","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/charges/54","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.300","qualityRationale":"The endpoint is confirmed live with a valid x402 402 challenge, but documentation is essentially nonexistent — all doc/pricing/API pages show only 'Connect wallet'. There is no OpenAPI spec, no request/response schema, and no description of what this specific endpoint actually returns. The listing is effectively a 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'/request':13,28 '0.02':12,27,88,142 '000':129 '0x8335':134 '20':128 '2913':135 '300':167 '402':238 '6':138 'accept':158 'access':7,22,38,117,256 'actual':212,259 'address':155 'ai/ml':59 'analysi':62 'analyt':58 'api':6,21,37,55,100,116,179,255 'application/json':164 'base':9,24,96,130,137 'base network api' 'broad':48 'call':4,19 'captur':240 'catalog':49 'challeng':123,239 'classif':64 'commit':107 'configur':172 'confirm':236 'connect':188 'content':194 'convers':81 'data':57,251 'decim':139 'detail':225 'difficult':247 'doc':178 'document':173,203,244 'embed':65 'endpoint':32,84,111,157,211,221,234 'equal':141 'estim':75 'exact':149 'exampl':206 'exchang':70 'extrem':175 'feed':69 'financ':66 'format':231 'function':253 'gas':74 'generat':82 'geocod':79 'host':46 'http':159 'http-post' 'infer':60 'infrastructur':77 'json-api' 'key':101 'know':249 'label':114 'lack':242 'land':217 'limit':104 'list':219 'live':237 'lowpaymentfee' 'lowpaymentfee.com':34 'made':145 'make':245 'mani':220 'maxamountrequir':126 'micropayment api' 'network':97 'no-api-key' 'openapi':198 'page':183,218 'paid':91 'paramet':228 'particular':210 'pay':2,17,52 'pay per call api' 'pay-per-cal':1,16 'pay-per-request':51 'payment':42,143,169 'payto':154 'per':3,18,53,89 'post':160 'premium':5,20,36,115,254 'premium api' 'price':68,86,180 'prompt':190 'protocol':43 'provid':35,223,260 'quot':73 'rate':71,103 'readm':182 'render':185 'request':54,90,161,227 'request/response':201 'requir':108 'respons':165,230 'return':119,163,213 'schema':202 'scheme':150 'second':168 'sentiment':61 'site':45,215 'span':56 'spars':176 'spec':199 'specif':110 'specifi':153 'summar':63 'timeout':170 'token':72 'unit':131 'usdc':15,30,93,133 'usdc api access' 'usdc-base' 'util':78 'valid':80,121 'via':10,25,39,146 'wallet':189 'web3':67 'x402':11,26,41,122,148 'x402 api' 'x402-payment'","prices":[{"id":"8a37394f-db76-4903-a29c-93dd63aace69","listingId":"140130ca-d288-4d04-90a5-5b175587fd92","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/charges/54","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:45:29.010Z"}],"sources":[{"listingId":"140130ca-d288-4d04-90a5-5b175587fd92","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/charges/54","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:45:29.010Z","lastSeenAt":"2026-04-22T12:03:43.310Z"}],"details":{"listingId":"140130ca-d288-4d04-90a5-5b175587fd92","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/charges/54 \\\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 (asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base with 300s timeout","source_url":"https://lowpaymentfee.com/api/v1/charges/54"},{"claim":"Site lists APIs across data & analytics, AI/ML, finance & Web3, and infrastructure categories","source_url":"https://lowpaymentfee.com"},{"claim":"Docs, API, pricing, and README pages render only 'Connect wallet' with no further content","source_url":"https://lowpaymentfee.com/docs"}],"useCases":["Agent-driven pay-per-call API consumption without pre-registration or API keys","Programmatic access to premium data or services settled instantly in USDC on Base","Testing x402 payment protocol integrations with a low-cost live endpoint"],"bestFor":["Developers experimenting with x402 payment-gated APIs","AI agents that need keyless, on-demand API access with crypto micropayments","Users who want no-commitment, pay-as-you-go API access on Base"],"notFor":["Users who need detailed API documentation or guaranteed SLAs before integrating","Anyone without a Base-compatible USDC wallet","High-volume consumers who need bulk pricing or subscription plans"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:21.446Z"},"updatedAt":"2026-04-22T12:03:43.310Z"}}