{"id":"0f34b56e-650d-43df-a969-3c4d77913f00","shortId":"Szy7tZ","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 on the platform, which offers a broad catalog 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, settled in USDC on the Base network.\n\nThe specific endpoint `/api/v1/payments/322` is labeled \"Premium API Access\" in the x402 challenge but its exact functionality is not documented beyond that label. The x402 challenge confirms it is live, accepts POST requests, and requires a payment of up to 20,000 base units of USDC (0x8335…2913 on Base), which equals $0.02 given USDC's 6 decimals. No API keys or rate limits are advertised — access is gated purely by the x402 micropayment. The platform's documentation pages (docs, pricing, README) all render only a \"Connect wallet\" prompt with no additional technical detail.\n\nBecause the crawled docs are essentially empty and no OpenAPI schema or request/response examples are available, the actual input parameters and response format for this specific endpoint remain unknown. The platform appears to be a demonstration or early-stage x402 API marketplace. Agents should be aware that the endpoint's concrete behavior is undocumented.","tags":[],"capabilities":["x402-payment","usdc-base","pay-per-request","post-method","no-api-key","micropayment"],"categories":["api-marketplace","payments"],"synonyms":["lowpaymentfee","low payment fee API","x402 premium API","Base USDC API","micropayment API","pay-per-call API"],"warnings":["Endpoint functionality is undocumented — 'Premium API Access' label gives no indication of what the endpoint actually does","All documentation pages (docs, pricing, README) return only a 'Connect wallet' prompt with no technical content","No OpenAPI or input/output schema available; request parameters and response format are unknown","Platform may be a demo or early-stage project"],"endpointUrl":"https://lowpaymentfee.com/api/v1/payments/322","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/322","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.300","qualityRationale":"The x402 challenge is live and pricing is clear ($0.02 USDC on Base), but the endpoint's actual functionality is completely undocumented — no OpenAPI schema, no request/response examples, and all doc pages render only 'Connect wallet'. The 'Premium API Access' label is generic and 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'/request':13,28 '0.02':12,27,97,159 '000':148 '0x8335':153 '20':147 '2913':154 '6':163 'Base USDC API' 'accept':137 'access':7,22,38,115,173 'actual':218 'addit':198 'advertis':172 'agent':244 'ai':67 'analysi':71 'analyt':66 'api':6,21,37,63,114,166,242 'appear':232 'avail':216 'awar':247 'base':9,24,105,149,156 'behavior':253 'beyond':127 'broad':56 'call':4,19 'catalog':57 'challeng':119,132 'classif':73 'concret':252 'confirm':133 'connect':193 'convers':90 'crawl':203 'data':65 'decim':164 'demonstr':236 'detail':200 'doc':186,204 'document':126,184 'earli':239 'early-stag':238 'embed':74 'empti':207 'endpoint':32,49,93,109,227,250 'equal':158 'essenti':206 'estim':84 'exact':122 'exampl':214 'exchang':79 'feed':78 'financ':75 'format':223 'function':123 'gas':83 'gate':175 'generat':91 'geocod':88 'given':160 'infrastructur':86 'input':219 'key':167 'label':112,129 'learn':69 'limit':170 'live':136 'low payment fee API' 'lowpaymentfee' 'lowpaymentfee.com':34 'machin':68 'mani':48 'marketplac':243 'micropay':180 'micropayment' 'micropayment API' 'network':106 'no-api-key' 'offer':54 'one':46 'openapi':210 'page':185 'paramet':220 'pay':2,17,60 'pay-per-cal':1,16 'pay-per-call API' 'pay-per-request':59 'payment':42,143 'per':3,18,61,98 'platform':52,182,231 'post':138 'post-method' 'premium':5,20,36,113 'price':77,95,187 'prompt':195 'protocol':43 'provid':35 'pure':176 'quot':82 'rate':80,169 'readm':188 'remain':228 'render':190 'request':62,99,139 'request/response':213 'requir':141 'respons':222 'schema':211 'sentiment':70 'settl':100 'span':64 'specif':108,226 'stage':240 'summar':72 'technic':199 'token':81 'undocu':255 'unit':150 'unknown':229 'usdc':15,30,102,152,161 'usdc-base' 'util':87 'valid':89 'via':10,25,39 'wallet':194 'web3':76 'x402':11,26,41,118,131,179,241 'x402 premium API' 'x402-payment'","prices":[{"id":"1cfb0d8a-59ae-4903-8ffc-cf1eca091171","listingId":"0f34b56e-650d-43df-a969-3c4d77913f00","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/322","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:50:24.171Z"}],"sources":[{"listingId":"0f34b56e-650d-43df-a969-3c4d77913f00","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/payments/322","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:50:24.171Z","lastSeenAt":"2026-04-22T21:31:09.371Z"}],"details":{"listingId":"0f34b56e-650d-43df-a969-3c4d77913f00","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/payments/322 \\\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/322"},{"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 asset address is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base","source_url":"https://lowpaymentfee.com/api/v1/payments/322"}],"useCases":["Accessing premium API functionality with per-request USDC micropayments on Base","Demonstrating x402 protocol integration for agent-to-service payments","Exploring a no-signup, no-API-key pay-as-you-go API platform"],"bestFor":["Developers experimenting with x402 micropayment protocols","Agents that can settle USDC payments on Base L2","Users who want zero-commitment, per-call API access without accounts"],"notFor":["Users needing well-documented API contracts with clear input/output schemas","Production workloads requiring SLA guarantees or detailed error handling docs"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:07.18Z"},"updatedAt":"2026-04-22T21:31:09.371Z"}}