{"id":"a1d05bca-a6f8-4702-8125-66cc4c8155e0","shortId":"NySgkp","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 collection of pay-per-request APIs spanning data & analytics, AI & machine learning (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, payable in USDC on the Base network with no API keys, no rate limits, and no minimum commitments.\n\nThe specific endpoint `/api/v1/payments/248` is labeled \"Premium API Access\" and accepts POST requests. The x402 challenge advertises a maxAmountRequired of 20,000 base units of USDC (asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913, which uses 6 decimals), equating to $0.02 per call. Payment is sent to address 0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3 on the Base network using the \"exact\" scheme, with a 300-second timeout.\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, and no examples available. It is unclear what this specific endpoint returns or what input it expects beyond a POST request with an x402 payment header. The site's landing page lists many API categories but does not clarify which endpoint ID (248) maps to which service.","tags":[],"capabilities":["x402-payment","usdc-base","pay-per-request","no-api-key","post-endpoint","json-response"],"categories":["api-gateway","payments"],"synonyms":["x402 API","pay-per-call API","USDC micropayment API","Base network API","lowpaymentfee","premium API access","crypto-paid API"],"warnings":["No OpenAPI spec or schema available — request and response formats are unknown","All documentation pages (docs, API, pricing, README) render only 'Connect wallet' with no usable content","It is unclear what /api/v1/payments/248 specifically returns or what input parameters it accepts","The site lists many API categories but does not map endpoint IDs to specific services"],"endpointUrl":"https://lowpaymentfee.com/api/v1/payments/248","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/248","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 schema, no request/response examples, and no clarity on what this specific endpoint (payments/248) actually does or returns. The listing is effectively a 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'/request':13,28 '0.02':12,27,88,143 '000':130 '0x1a2b13e97f5f837c8f9fa1f95a1484b7c70d85f3':151 '0x833589fcd6edb6e08f4c7c32d4f71b54bda02913':136 '20':129 '248':237 '300':162 '6':139 'Base network API' 'USDC micropayment API' 'accept':119 'access':7,22,38,117 'address':150 'advertis':125 'ai':58 'analysi':62 'analyt':57 'api':6,21,37,54,100,116,171,228 'asset':135 'avail':198 'base':9,24,96,131,154 'beyond':212 'call':4,19,145 'categori':229 'challeng':124 'clarifi':233 'classif':64 'collect':48 'commit':108 'connect':180 'content':186 'convers':81 'crypto-paid API' 'data':56 'decim':140 'doc':170 'document':165 'embed':65 'endpoint':32,84,111,205,235 'equat':141 'estim':75 'exact':158 'exampl':197 'exchang':70 'expect':211 'extrem':167 'feed':69 'financ':66 'gas':74 'generat':82 'geocod':79 'header':220 'host':46 'id':236 'infrastructur':77 'input':209 'json-response' 'key':101 'label':114 'land':224 'learn':60 'limit':104 'list':226 'lowpaymentfee' 'lowpaymentfee.com':34 'machin':59 'mani':227 'map':238 'maxamountrequir':127 'minimum':107 'network':97,155 'no-api-key' 'openapi':190 'page':175,225 'pay':2,17,51 'pay-per-cal':1,16 'pay-per-call API' 'pay-per-request':50 'payabl':91 'payment':42,146,219 'per':3,18,52,89,144 'post':120,214 'post-endpoint' 'premium':5,20,36,115 'premium API access' 'price':68,86,172 'prompt':182 'protocol':43 'provid':35 'quot':73 'rate':71,103 'readm':174 'render':177 'request':53,90,121,215 'request/response':193 'return':206 'schema':194 'scheme':159 'second':163 'sent':148 'sentiment':61 'servic':241 'site':45,222 'span':55 'spars':168 'spec':191 'specif':110,204 'summar':63 'timeout':164 'token':72 'unclear':201 'unit':132 'usdc':15,30,93,134 'usdc-base' 'use':138,156 'util':78 'valid':80 'via':10,25,39 'wallet':181 'web3':67 'x402':11,26,41,123,218 'x402 API' 'x402-payment'","prices":[{"id":"d7414b4e-08e4-479a-bb31-e8a50264efb5","listingId":"a1d05bca-a6f8-4702-8125-66cc4c8155e0","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/248","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:50:01.446Z"}],"sources":[{"listingId":"a1d05bca-a6f8-4702-8125-66cc4c8155e0","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/payments/248","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:50:01.446Z","lastSeenAt":"2026-04-23T14:31:09.491Z"}],"details":{"listingId":"a1d05bca-a6f8-4702-8125-66cc4c8155e0","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/payments/248 \\\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/248"},{"claim":"All endpoints are 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":"USDC asset address is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/payments/248"},{"claim":"The site offers APIs across data & analytics, AI & ML, finance & Web3, and infrastructure categories","source_url":"https://lowpaymentfee.com"}],"useCases":["Accessing premium API services with per-request USDC micropayments on Base","Agent-driven API consumption without pre-registration or API keys","Programmatic pay-as-you-go access to data, AI, finance, or utility endpoints"],"bestFor":["Developers wanting keyless, pay-per-use API access settled in USDC on Base","AI agents that can handle x402 payment challenges autonomously","Users who prefer crypto micropayments over subscription billing"],"notFor":["Users who need detailed API documentation or OpenAPI specs before integrating","Applications requiring high-volume, low-latency calls where per-request payment overhead is unacceptable","Developers who cannot transact in USDC on the Base network"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:08.237Z"},"updatedAt":"2026-04-23T14:31:09.491Z"}}