{"id":"5a911574-79e7-4151-a0c0-99d95fd8b8e8","shortId":"eYusp9","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, settled in USDC on the Base network.\n\nThe specific endpoint `/api/v1/charges/211` is labeled \"Premium API Access\" in the x402 challenge. Its maxAmountRequired is 20000 base units of USDC (6 decimals), which equals $0.02. Payment is made via the x402 exact scheme — no API keys, no rate limits, and no subscriptions required. 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 spec, no request/response schema documentation, and no examples of what this particular endpoint actually returns. The site's landing page lists many API paths but provides no detail on request parameters or response formats. Without additional documentation it is unclear what specific data or functionality the `/api/v1/charges/211` path provides beyond the generic \"Premium API Access\" label.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","pay-per-request","json-response","no-api-key","post-method"],"categories":["api-gateway","infrastructure"],"synonyms":["lowpaymentfee","low payment fee API","x402 API","pay-per-call API","USDC API","Base network API","micropayment API"],"warnings":["No documentation available — docs, API, pricing, and README pages all show only 'Connect wallet'","No OpenAPI or schema describing request parameters or response format","The specific functionality of /api/v1/charges/211 ('Premium API Access') is undefined — it does not match any of the named endpoints listed on the homepage","Cannot verify what data or service is actually delivered after payment"],"endpointUrl":"https://lowpaymentfee.com/api/v1/charges/211","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/211","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 402 challenge, confirming pricing and payment details. However, there is no OpenAPI spec, no request/response schema, no documentation beyond a wallet-connect prompt, and no clarity on what 'Premium API Access' at /api/v1/charges/211 actually returns. This is effectively a stub 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'/request':13,28 '0.02':12,27,88,123 '20000':114 '6':119 'Base network API' 'USDC API' 'accept':144 'access':7,22,38,106,230 'actual':189 'addit':211 'ai/ml':59 'analysi':62 'analyt':58 'api':6,21,37,55,105,133,156,198,229 'application/json':149 'base':9,24,96,115 'base-network' 'beyond':225 'broad':48 'call':4,19 'catalog':49 'challeng':110 'classif':64 'connect':165 'content':171 'convers':81 'data':57,218 'decim':120 'detail':203 'doc':155 'document':150,180,212 'embed':65 'endpoint':32,84,100,143,188 'equal':122 'estim':75 'exact':130 'exampl':183 'exchang':70 'extrem':152 'feed':69 'financ':66 'format':209 'function':220 'gas':74 'generat':82 'generic':227 'geocod':79 'host':46 'infer':60 'infrastructur':77 'json-response' 'key':134 'label':103,231 'land':194 'limit':137 'list':196 'low payment fee API' 'lowpaymentfee' 'lowpaymentfee.com':34 'made':126 'mani':197 'maxamountrequir':112 'micropayment API' 'network':97 'no-api-key' 'openapi':175 'page':160,195 'paramet':206 'particular':187 'path':199,223 'pay':2,17,52 'pay-per-cal':1,16 'pay-per-call API' 'pay-per-request':51 'payment':42,124 'per':3,18,53,89 'post':145 'post-method' 'premium':5,20,36,104,228 'price':68,86,157 'prompt':167 'protocol':43 'provid':35,201,224 'quot':73 'rate':71,136 'readm':159 'render':162 'request':54,90,146,205 'request/response':178 'requir':141 'respons':208 'return':148,190 'schema':179 'scheme':131 'sentiment':61 'settl':91 'site':45,192 'span':56 'spars':153 'spec':176 'specif':99,217 'subscript':140 'summar':63 'token':72 'unclear':215 'unit':116 'usdc':15,30,93,118 'usdc-settlement' 'util':78 'valid':80 'via':10,25,39,127 'wallet':166 'web3':67 'without':210 'x402':11,26,41,109,129 'x402 API' 'x402-payment'","prices":[{"id":"b402de89-6320-491c-b9df-b71ad34da4f3","listingId":"5a911574-79e7-4151-a0c0-99d95fd8b8e8","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/211","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:44:34.516Z"}],"sources":[{"listingId":"5a911574-79e7-4151-a0c0-99d95fd8b8e8","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/charges/211","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:44:34.516Z","lastSeenAt":"2026-04-24T03:32:07.900Z"}],"details":{"listingId":"5a911574-79e7-4151-a0c0-99d95fd8b8e8","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/charges/211 \\\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, instant access on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"x402 challenge shows maxAmountRequired of 20000 base units of USDC (asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base network","source_url":"https://lowpaymentfee.com/api/v1/charges/211"},{"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":["Programmatic access to premium API services with per-call USDC micropayments","Agent-driven API consumption without pre-registration or API key management","On-chain settled API calls for trustless, permissionless integrations"],"bestFor":["Developers wanting zero-signup, pay-as-you-go API access","AI agents that can settle x402 payments autonomously on Base","Users who prefer crypto micropayments over subscription billing"],"notFor":["Users needing detailed API documentation or guaranteed SLAs before purchasing","High-volume consumers who would benefit from bulk pricing or subscriptions","Anyone without a Base-compatible USDC wallet"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:24.005Z"},"updatedAt":"2026-04-24T03:32:07.900Z"}}