{"id":"1dc85375-6c4a-4c81-88c6-1dbef7c96efc","shortId":"Hsk7LP","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, settled in USDC on the Base network, with no API keys, no rate limits, and no commitments required.\n\nThe specific endpoint `/api/v1/charges/348` is labeled \"Premium API Access\" in the x402 challenge. The challenge confirms it accepts exact-scheme payments of up to 20,000 base units of USDC (0x8335…2913 on Base), which equals $0.02 given USDC's 6 decimals. Payment is made via the X-PAYMENT header on a POST request, and the endpoint returns application/json. The platform advertises instant access with no signup.\n\nDocumentation 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 schema, no request/response examples, and no description of what \"Premium API Access\" actually returns or what input it expects. The endpoint is live (402 challenge confirmed), but without documentation it is unclear what data or functionality this specific charge endpoint provides versus the other named endpoints on the platform.","tags":[],"capabilities":["x402-payment","usdc-base","pay-per-request","json-response","no-api-key","no-rate-limit"],"categories":["api","infrastructure"],"synonyms":["lowpaymentfee","low payment fee API","x402 premium API","pay-per-call API","USDC API access","Base network API","micropayment API"],"warnings":["No documentation available — /docs, /pricing, /api, and /README all render only 'Connect wallet' with no content.","No OpenAPI or schema describing request parameters or response format for this endpoint.","The purpose of /api/v1/charges/348 ('Premium API Access') is entirely unclear; it does not match any of the named endpoints listed on the homepage.","Cannot verify what data or service is actually returned upon successful payment."],"endpointUrl":"https://lowpaymentfee.com/api/v1/charges/348","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/348","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 with clear pricing, but there is no documentation, no OpenAPI schema, no request/response examples, and no explanation of what this specific endpoint actually does. 'Premium API Access' is a generic label with no discernible functionality described anywhere in the 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'/api/v1/charges/348':105 '/docs':176 '/pricing':177 '/readme':180 '/request':13,28 '0.02':12,27,81,139 '000':128 '0x8335':133 '20':127 '2913':134 '402':220 '6':143 'Base network API' 'USDC API access' 'accept':119 'access':7,22,38,110,167,208 'actual':209 'advertis':165 'ai':68 'analyt':67 'api':6,21,37,64,93,109,207 'application/json':162 'base':9,24,89,129,136 'call':4,19 'challeng':114,116,221 'charg':235 'collect':58 'commit':100 'confirm':117,222 'connect':186 'content':192 'data':66,230 'decim':144 'descript':203 'document':171,225 'endpoint':32,49,77,104,160,217,236,242 'equal':138 'exact':121 'exact-schem':120 'exampl':200 'expect':215 'extrem':173 'financ':71 'function':232 'given':140 'header':153 'host':56 'infrastructur':74 'input':213 'instant':166 'json-response' 'key':94 'label':107 'learn':70 'limit':97 'live':219 'low payment fee API' 'lowpaymentfee' 'lowpaymentfee.com':34,53 'machin':69 'made':147 'mani':48 'micropayment API' 'name':241 'network':90 'no-api-key' 'no-rate-limit' 'offer':50 'one':46 'openapi':196 'page':181 'pay':2,17,61 'pay-per-cal':1,16 'pay-per-call API' 'pay-per-request':60 'payment':42,123,145,152 'per':3,18,62,82 'platform':54,164,245 'post':156 'premium':5,20,36,108,206 'price':79 'prompt':188 'protocol':43 'provid':35,237 'rate':96 'render':183 'request':63,83,157 'request/response':199 'requir':101 'return':161,210 'schema':197 'scheme':122 'settl':84 'signup':170 'span':65 'spars':174 'specif':103,234 'unclear':228 'unit':130 'usdc':15,30,86,132,141 'usdc-base' 'util':75 'versus':238 'via':10,25,39,148 'wallet':187 'web3':72 'without':224 'x':151 'x-payment':150 'x402':11,26,41,113 'x402 premium API' 'x402-payment'","prices":[{"id":"33260286-3dcf-488f-a57b-1be7947a1726","listingId":"1dc85375-6c4a-4c81-88c6-1dbef7c96efc","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/348","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:45:10.875Z"}],"sources":[{"listingId":"1dc85375-6c4a-4c81-88c6-1dbef7c96efc","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/charges/348","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:45:10.875Z","lastSeenAt":"2026-04-22T11:31:34.382Z"}],"details":{"listingId":"1dc85375-6c4a-4c81-88c6-1dbef7c96efc","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/charges/348 \\\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 valid x402 challenge with maxAmountRequired of 20000 base units of USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/charges/348"},{"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":"The platform offers APIs across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"},{"claim":"USDC contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 with 6 decimals","source_url":"https://lowpaymentfee.com/api/v1/charges/348"}],"useCases":["Accessing premium API functionality 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 zero-signup, pay-per-call API access","AI agents that can settle x402 payments autonomously","Users who prefer crypto micropayments over subscription billing"],"notFor":["Users needing detailed API documentation or request/response schemas before integrating","High-volume consumers who would benefit from bulk pricing or subscriptions","Users without a Base-compatible USDC wallet"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:22.335Z"},"updatedAt":"2026-04-22T11:31:34.382Z"}}