{"id":"b063606d-de4f-4d5d-8bca-344205cc97f0","shortId":"hw6bbq","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/ML inference, finance & Web3 data, and infrastructure utilities — all priced at $0.02 per request and settled in USDC on the Base network. No API keys, rate limits, or upfront commitments are required; callers simply attach an x402 payment header to each request.\n\nThe specific endpoint `/api/v1/charges/397` is listed as \"Premium API Access\" and returns a 402 challenge requesting up to 20,000 base units of USDC (0x8335…2913 on Base, 6 decimals = $0.02) per call. The payment scheme is \"exact\" with a 300-second timeout. The endpoint accepts HTTP POST and returns `application/json`.\n\nDocumentation on the site is extremely sparse — the /docs, /pricing, /api, 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 landing page lists sibling endpoints for analytics, AI, finance, and utility tasks, but the specific functionality behind `/api/v1/charges/397` is not described beyond its title. Prospective users should be aware that without documentation, the actual payload and response structure are unknown.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","pay-per-request","json-api","http-post"],"categories":["api","infrastructure"],"synonyms":["premium API","pay-per-call API","x402 API","USDC micropayment API","lowpaymentfee","Base network API","crypto-paid API"],"warnings":["No documentation available — /docs, /pricing, /api, and /README pages all render only 'Connect wallet' with no content","No OpenAPI or schema describing request parameters or response format for this specific endpoint","The exact functionality behind /api/v1/charges/397 is unknown; 'Premium API Access' is not descriptive","Sibling endpoints on the site cover diverse domains (AI, finance, analytics, utilities) but it is unclear which, if any, this endpoint maps to"],"endpointUrl":"https://lowpaymentfee.com/api/v1/charges/397","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/397","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 402 challenge, confirming pricing and payment details. However, there is zero documentation on what the endpoint actually does, no request/response schemas, no examples, and no OpenAPI spec. The /docs and other pages are empty. The listing title 'Premium API Access' is generic and uninformative. This is effectively a 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'/api/v1/charges/397':103,213 '/docs':159 '/pricing':160 '/readme':163 '/request':13,28 '0.02':12,27,69,130 '000':119 '0x8335':124 '20':118 '2913':125 '300':140 '402':113 '6':128 'Base network API' 'USDC micropayment API' 'accept':145 'access':7,22,38,109 'actual':193,229 'ai':203 'ai/ml':58 'analyt':57,202 'api':6,21,37,54,81,108 'application/json':150 'attach':92 'awar':224 'base':9,24,78,120,127 'base-network' 'behind':212 'beyond':217 'call':4,19,132 'caller':90 'challeng':114 'collect':48 'commit':87 'connect':169 'content':175 'crypto-paid API' 'data':56,62 'decim':129 'describ':216 'document':151,184,227 'endpoint':32,102,144,192,200 'exact':137 'exampl':187 'extrem':156 'financ':60,204 'function':211 'header':96 'host':46 'http':146 'http-post' 'infer':59 'infrastructur':64 'json-api' 'key':82 'land':196 'limit':84 'list':105,198 'lowpaymentfee' 'lowpaymentfee.com':34 'network':79 'openapi':179 'page':164,197 'particular':191 'pay':2,17,51 'pay-per-cal':1,16 'pay-per-call API' 'pay-per-request':50 'payload':230 'payment':42,95,134 'per':3,18,52,70,131 'post':147 'premium':5,20,36,107 'premium API' 'price':67 'prompt':171 'prospect':220 'protocol':43 'provid':35 'rate':83 'render':166 'request':53,71,99,115 'request/response':182 'requir':89 'respons':232 'return':111,149,194 'schema':183 'scheme':135 'second':141 'settl':73 'sibl':199 'simpli':91 'site':45,154 'span':55 'spars':157 'spec':180 'specif':101,210 'structur':233 'task':207 'timeout':142 'titl':219 'unit':121 'unknown':235 'upfront':86 'usdc':15,30,75,123 'usdc-settlement' 'user':221 'util':65,206 'via':10,25,39 'wallet':170 'web3':61 'without':226 'x402':11,26,41,94 'x402 API' 'x402-payment'","prices":[{"id":"342a040f-2085-43d2-9726-0ef503fe0ba5","listingId":"b063606d-de4f-4d5d-8bca-344205cc97f0","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/397","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:45:25.354Z"}],"sources":[{"listingId":"b063606d-de4f-4d5d-8bca-344205cc97f0","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/charges/397","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:45:25.354Z","lastSeenAt":"2026-04-22T11:31:35.310Z"}],"details":{"listingId":"b063606d-de4f-4d5d-8bca-344205cc97f0","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/charges/397 \\\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 402 with x402 challenge requesting up to 20,000 base units of USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/charges/397"},{"claim":"Site lists APIs at $0.02/request with no API keys, no rate limits, and instant access on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"USDC contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 with 6 decimals","source_url":"https://lowpaymentfee.com/api/v1/charges/397"},{"claim":"Documentation pages (/docs, /pricing, /api, /README) render only 'Connect wallet' with no further content","source_url":"https://lowpaymentfee.com/docs"}],"useCases":["Accessing premium data or services with per-request USDC micropayments on Base","Agent-driven API consumption without API keys or subscriptions","Programmatic pay-as-you-go access to undocumented premium functionality"],"bestFor":["Developers or agents wanting keyless, pay-per-call API access","Users comfortable paying in USDC on Base L2","Scenarios requiring no rate limits or upfront commitments"],"notFor":["Users who need detailed API documentation or guaranteed response schemas before purchasing","Anyone without a Base-compatible USDC wallet","High-volume use cases where per-request pricing may be inefficient compared to subscription plans"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:21.641Z"},"updatedAt":"2026-04-22T11:31:35.310Z"}}