{"id":"3a6ac344-59cc-4238-a70e-437eaafee71b","shortId":"p76ME8","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/payments/310` is listed as \"Premium API Access\" but the crawled documentation does not clarify what data or functionality this particular route returns — it does not appear in the site's publicly listed API catalog. The x402 challenge confirms the endpoint is live, accepting POST requests, and requires a payment of up to 20,000 base units of USDC (0.02 USD) on Base (asset contract 0x8335…2913). The payment is settled to address 0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3 with a 300-second timeout.\n\nThe broader platform advertises endpoints for sentiment analysis, text summarization, classification, embeddings, price feeds, exchange rates, geocoding, validation, conversion, and data export — all at the same $0.02 price point. However, no OpenAPI schema, request/response examples, or detailed documentation was found for any endpoint, including this one. The docs, pricing, and API pages all render only a \"Connect wallet\" prompt with no further content.","tags":[],"capabilities":["x402-payment","usdc-base","pay-per-request","no-api-key","post-method","json-response"],"categories":["api-gateway","payments"],"synonyms":["lowpaymentfee","low payment fee API","x402 premium API","pay-per-call API","USDC micropayment API","Base network API"],"warnings":["The endpoint /api/v1/payments/310 does not appear in the site's publicly listed API catalog — its specific functionality is unknown.","No OpenAPI schema, request body format, or response examples are available.","All documentation pages (docs, pricing, API, README) render only 'Connect wallet' with no useful content.","The purpose and output of this 'Premium API Access' endpoint cannot be verified from available sources."],"endpointUrl":"https://lowpaymentfee.com/api/v1/payments/310","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/310","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, but there is no OpenAPI schema, no request/response examples, and no documentation beyond a landing page listing. The specific endpoint '/api/v1/payments/310' is not even listed in the site's public catalog, making its purpose unclear. Effectively a stub 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'/request':13,28 '0.02':12,27,81,163,209 '000':158 '0x1a2b13e97f5f837c8f9fa1f95a1484b7c70d85f3':177 '0x8335':169 '20':157 '2913':170 '300':180 'Base network API' 'USDC micropayment API' 'accept':147 'access':7,22,38,111 'address':176 'advertis':186 'ai':68 'analysi':190 'analyt':67 'api':6,21,37,64,93,110,137,233 'appear':130 'asset':167 'base':9,24,89,159,166 'broader':184 'call':4,19 'catalog':138 'challeng':141 'clarifi':118 'classif':193 'collect':58 'commit':100 'confirm':142 'connect':239 'content':245 'contract':168 'convers':201 'crawl':114 'data':66,120,203 'detail':219 'doc':230 'document':115,220 'embed':194 'endpoint':32,49,77,104,144,187,225 'exampl':217 'exchang':197 'export':204 'feed':196 'financ':71 'found':222 'function':122 'geocod':199 'host':56 'howev':212 'includ':226 'infrastructur':74 'json-response' 'key':94 'learn':70 'limit':97 'list':107,136 'live':146 'low payment fee API' 'lowpaymentfee' 'lowpaymentfee.com':34,53 'machin':69 'mani':48 'network':90 'no-api-key' 'offer':50 'one':46,228 'openapi':214 'page':234 'particular':124 'pay':2,17,61 'pay-per-cal':1,16 'pay-per-call API' 'pay-per-request':60 'payment':42,153,172 'per':3,18,62,82 'platform':54,185 'point':211 'post':148 'post-method' 'premium':5,20,36,109 'price':79,195,210,231 'prompt':241 'protocol':43 'provid':35 'public':135 'rate':96,198 'render':236 'request':63,83,149 'request/response':216 'requir':101,151 'return':126 'rout':125 'schema':215 'second':181 'sentiment':189 'settl':84,174 'site':133 'span':65 'specif':103 'summar':192 'text':191 'timeout':182 'unit':160 'usd':164 'usdc':15,30,86,162 'usdc-base' 'util':75 'valid':200 'via':10,25,39 'wallet':240 'web3':72 'x402':11,26,41,140 'x402 premium API' 'x402-payment'","prices":[{"id":"e7338c04-1002-4f48-81f4-fd773638d483","listingId":"3a6ac344-59cc-4238-a70e-437eaafee71b","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/310","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:50:11.806Z"}],"sources":[{"listingId":"3a6ac344-59cc-4238-a70e-437eaafee71b","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/payments/310","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:50:11.806Z","lastSeenAt":"2026-04-23T14:01:24.504Z"}],"details":{"listingId":"3a6ac344-59cc-4238-a70e-437eaafee71b","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/payments/310 \\\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/310"},{"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 & Machine Learning, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/payments/310"}],"useCases":["Accessing premium API functionality with per-request USDC micropayments on Base","Agent-driven API consumption without pre-registration or API keys","Testing x402 payment protocol integrations against a live endpoint"],"bestFor":["Developers exploring x402 pay-per-call patterns","Agents needing keyless, instant API access on Base","Low-volume or sporadic API consumers who prefer pay-as-you-go"],"notFor":["Users who need detailed API documentation or schemas before integrating","High-volume consumers seeking bulk pricing or subscription discounts","Anyone requiring non-crypto payment methods"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:07.759Z"},"updatedAt":"2026-04-23T14:01:24.504Z"}}