{"id":"668148bd-7c29-480d-8844-80ddc870b617","shortId":"wZpRPu","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 lowpaymentfee.com platform, which hosts a collection of pay-per-request APIs spanning 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, rate limits, or commitments required.\n\nThe specific endpoint `/api/v1/charges/388` is listed as \"Premium API Access\" and accepts POST requests. The x402 challenge confirms it is live, requiring an exact payment of 20,000 base units of USDC (0x8335…2913 on Base), which equals $0.02 given USDC's 6 decimals. Payment is sent to address 0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3 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 schema, no request/response examples, and no description of what this particular endpoint actually returns. The platform's landing page lists many other endpoints (analytics, AI, finance, utilities) but does not clarify what `/api/v1/charges/388` specifically does beyond the generic label \"Premium API Access.\" Without documentation or example responses, the actual functionality of this endpoint remains unclear.","tags":[],"capabilities":["x402-payment","usdc-base","pay-per-request","no-api-key","post-endpoint"],"categories":["api","payments"],"synonyms":["x402 API","pay-per-call API","USDC micropayment API","Base network API","lowpaymentfee","premium API","crypto-paid API"],"warnings":["No documentation available — all doc pages show only 'Connect wallet'","No OpenAPI or schema describing request parameters or response format","The specific functionality of /api/v1/charges/388 is completely undocumented","Cannot verify what data or service is actually returned after payment"],"endpointUrl":"https://lowpaymentfee.com/api/v1/charges/388","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/388","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 clear description of what the endpoint actually does beyond the generic 'Premium API Access' label. All doc pages render only 'Connect wallet' with no 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'/request':13,28 '0.02':12,27,81,138 '000':127 '0x1a2b13e97f5f837c8f9fa1f95a1484b7c70d85f3':149 '0x8335':132 '20':126 '2913':133 '300':152 '6':142 'Base network API' 'USDC micropayment API' 'accept':111 'access':7,22,38,109,222 'actual':193,229 'address':148 'ai':68,205 'analyt':67,204 'api':6,21,37,64,93,108,161,221 'base':9,24,89,128,135 'beyond':216 'call':4,19 'challeng':116 'clarifi':211 'collect':58 'commit':98 'confirm':117 'connect':170 'content':176 'crypto-paid API' 'data':66 'decim':143 'descript':187 'doc':160 'document':155,224 'endpoint':32,49,77,102,192,203,233 'equal':137 'exact':123 'exampl':184,226 'extrem':157 'financ':71,206 'function':230 'generic':218 'given':139 'host':56 'infrastructur':74 'key':94 'label':219 'land':198 'learn':70 'limit':96 'list':105,200 'live':120 'lowpaymentfee' 'lowpaymentfee.com':34,53 'machin':69 'mani':48,201 'network':90 'no-api-key' 'offer':50 'one':46 'openapi':180 'page':165,199 'particular':191 'pay':2,17,61 'pay-per-cal':1,16 'pay-per-call API' 'pay-per-request':60 'payabl':84 'payment':42,124,144 'per':3,18,62,82 'platform':54,196 'post':112 'post-endpoint' 'premium':5,20,36,107,220 'premium API' 'price':79,162 'prompt':172 'protocol':43 'provid':35 'rate':95 'readm':164 'remain':234 'render':167 'request':63,83,113 'request/response':183 'requir':99,121 'respons':227 'return':194 'schema':181 'second':153 'sent':146 'span':65 'spars':158 'specif':101,214 'timeout':154 'unclear':235 'unit':129 'usdc':15,30,86,131,140 'usdc-base' 'util':75,207 'via':10,25,39 'wallet':171 'web3':72 'without':223 'x402':11,26,41,115 'x402 API' 'x402-payment'","prices":[{"id":"d8b262fe-33dc-42bb-a934-5a29bc586985","listingId":"668148bd-7c29-480d-8844-80ddc870b617","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/388","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:45:19.908Z"}],"sources":[{"listingId":"668148bd-7c29-480d-8844-80ddc870b617","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/charges/388","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:45:19.908Z","lastSeenAt":"2026-04-22T12:03:42.750Z"}],"details":{"listingId":"668148bd-7c29-480d-8844-80ddc870b617","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/charges/388 \\\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":"Endpoint returns a valid x402 challenge with maxAmountRequired of 20000 base units of USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/charges/388"},{"claim":"All endpoints priced at $0.02/request with no API keys, no rate limits, instant access on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset address 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base","source_url":"https://lowpaymentfee.com/api/v1/charges/388"},{"claim":"Platform offers APIs across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"}],"useCases":["Accessing a pay-per-request API without needing API keys or subscriptions","Making micropayments in USDC on Base for on-demand API calls","Integrating x402-compatible agents with low-cost endpoints"],"bestFor":["Developers wanting zero-commitment pay-per-use API access","AI agents that support x402 payment protocol on Base","Users who prefer crypto micropayments over traditional billing"],"notFor":["Users who need detailed API documentation or response schemas before integrating","Anyone without USDC on the Base network","High-volume use cases where per-request pricing may add up without bulk discounts"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:21.869Z"},"updatedAt":"2026-04-22T12:03:42.750Z"}}