{"id":"a3d5a498-aa47-4310-81ca-1690e14638c2","shortId":"cWYmWa","kind":"x402","title":"Pay-per-call premium API access on Base via x402 — $0.02 per request in USDC.","tagline":"Pay-per-call premium API access on Base via x402 — $0.02 per 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-call 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/82` is labeled \"Premium API Access\" in the x402 challenge. Its exact functionality beyond that label is not documented — the crawled docs, pricing, API, and README pages all returned only a \"Connect wallet\" stub with no further detail. The x402 challenge confirms the endpoint is live, accepts POST requests, charges a maximum of 20,000 base units of USDC (i.e., $0.02 given 6 decimals), and pays out to address `0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3`. No API keys or rate limits are advertised; access is gated purely by the x402 payment header.\n\nBecause the site's documentation pages are essentially empty (wallet-connect stubs only), the actual request/response schema for this endpoint is unknown. The listing is based entirely on the x402 challenge metadata and the site's landing page descriptions. Prospective callers should be aware that the precise input parameters and output format are undocumented.","tags":[],"capabilities":["x402-payment","usdc-base","pay-per-call","no-api-key","post-endpoint","json-response"],"categories":["api-gateway","payments"],"synonyms":["x402 API","pay-per-request API","USDC micropayment API","Base network API","lowpaymentfee","premium API access","crypto-paid API"],"warnings":["Documentation pages (/docs, /api, /pricing, /README) all return only a 'Connect wallet' stub with no actual content.","The exact functionality of /api/v1/payments/82 ('Premium API Access') is not described anywhere — it may be a generic or demo endpoint.","No request or response schema is available; callers must discover input/output format by experimentation.","The site lists many API categories on its landing page but none map directly to this specific endpoint path."],"endpointUrl":"https://lowpaymentfee.com/api/v1/payments/82","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/82","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 confirms pricing and network, but all documentation pages are empty stubs ('Connect wallet' only). The specific functionality of /api/v1/payments/82 is undocumented — no input schema, no output schema, no examples. The listing is essentially a stub built from challenge metadata and the landing 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'0.02':12,28,91,164 '000':158 '0x1a2b13e97f5f837c8f9fa1f95a1484b7c70d85f3':173 '20':157 '6':166 'Base network API' 'USDC micropayment API' 'accept':150 'access':7,23,40,109,182 'actual':206 'address':172 'advertis':181 'ai':61 'analysi':65 'analyt':60 'api':6,22,39,57,108,127,175 'awar':235 'base':9,25,99,159,217 'beyond':117 'broad':50 'call':4,20,56 'caller':232 'catalog':51 'challeng':113,144,222 'charg':153 'classif':67 'confirm':145 'connect':135,202 'convers':84 'crawl':124 'crypto-paid API' 'data':59 'decim':167 'descript':230 'detail':141 'doc':125 'document':122,195 'embed':68 'empti':199 'endpoint':34,87,103,147,211 'entir':218 'essenti':198 'estim':78 'exact':115 'exchang':73 'feed':72 'financ':69 'format':243 'function':116 'gas':77 'gate':184 'generat':85 'geocod':82 'given':165 'header':190 'host':48 'i.e':163 'infrastructur':80 'input':239 'json-response' 'key':176 'label':106,119 'land':228 'learn':63 'limit':179 'list':215 'live':149 'lowpaymentfee' 'lowpaymentfee.com':36 'machin':62 'maximum':155 'metadata':223 'network':100 'no-api-key' 'output':242 'page':130,196,229 'paramet':240 'pay':2,18,54,169 'pay-per-cal':1,17,53 'pay-per-call' 'pay-per-request API' 'payment':44,189 'per':3,13,19,29,55,92 'post':151 'post-endpoint' 'precis':238 'premium':5,21,38,107 'premium API access' 'price':71,89,126 'prospect':231 'protocol':45 'provid':37 'pure':185 'quot':76 'rate':74,178 'readm':129 'request':14,30,93,152 'request/response':207 'return':132 'schema':208 'sentiment':64 'settl':94 'site':47,193,226 'span':58 'specif':102 'stub':137,203 'summar':66 'token':75 'undocu':245 'unit':160 'unknown':213 'usdc':16,32,96,162 'usdc-base' 'util':81 'valid':83 'via':10,26,41 'wallet':136,201 'wallet-connect':200 'web3':70 'x402':11,27,43,112,143,188,221 'x402 API' 'x402-payment'","prices":[{"id":"ec9473d2-623d-4713-9276-de6db85160cc","listingId":"a3d5a498-aa47-4310-81ca-1690e14638c2","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/82","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:50:47.718Z"}],"sources":[{"listingId":"a3d5a498-aa47-4310-81ca-1690e14638c2","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/payments/82","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:50:47.718Z","lastSeenAt":"2026-04-23T09:31:17.942Z"}],"details":{"listingId":"a3d5a498-aa47-4310-81ca-1690e14638c2","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/payments/82 \\\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 HTTP 402 with x402 challenge, confirming it is live","source_url":"https://lowpaymentfee.com/api/v1/payments/82"},{"claim":"maxAmountRequired is 20000 base units of USDC (asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base, equaling $0.02","source_url":"https://lowpaymentfee.com/api/v1/payments/82"},{"claim":"Site advertises $0.02/request pricing, no API keys, no rate limits, instant access, Base network","source_url":"https://lowpaymentfee.com"},{"claim":"Documentation pages return only 'Connect wallet' with no substantive content","source_url":"https://lowpaymentfee.com/docs"}],"useCases":["Programmatic access to a premium API endpoint with per-call USDC micropayments","Agent-driven workflows that need keyless, pay-as-you-go API access on Base","Demonstrating or testing x402 payment protocol integrations"],"bestFor":["Developers experimenting with x402 payment-gated APIs","Agents that can settle USDC payments on Base L2","Low-volume, on-demand API consumption without subscriptions"],"notFor":["Users who need detailed API documentation or guaranteed SLAs","High-volume batch processing where per-call fees add up","Anyone without a Base-compatible USDC wallet"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:06.015Z"},"updatedAt":"2026-04-23T09:31:17.942Z"}}