{"id":"933652e2-9359-4a91-996a-90e497fe8700","shortId":"cRG6fZ","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 is one of many x402-enabled API endpoints offered by the provider. The specific resource at `/api/v1/payments/356` is labeled \"Premium API Access\" and accepts POST requests, settling payments in USDC on the Base network. The x402 challenge advertises a maxAmountRequired of 20,000 base units of USDC (6 decimals), which equals $0.02 per request — consistent with the provider's site-wide flat pricing of $0.02/call.\n\nThe provider's landing page lists a broad catalog of endpoints spanning data & analytics (metrics, reports, data export, insights), AI & machine learning (sentiment analysis, text summarization, classification, embeddings), finance & Web3 (price feeds, exchange rates, token quotes, gas estimates), and infrastructure utilities (geocoding, validation, conversion, generation). All endpoints are advertised at the same $0.02 price point with no API keys, no rate limits, and instant access.\n\nHowever, the specific functionality behind `/api/v1/payments/356` is not documented beyond the generic label \"Premium API Access.\" The docs, pricing, and README pages all returned only a \"Connect wallet\" prompt with no substantive content. There is no OpenAPI schema, no request/response examples, and no detailed documentation for this or any other endpoint. The endpoint is live (returns a valid 402 challenge), but what it actually returns after payment is unknown.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","pay-per-request","no-api-key"],"categories":["payments","api-gateway"],"synonyms":["x402 API","pay-per-call API","USDC micropayment API","Base network API","lowpaymentfee","premium API access","crypto-paid API"],"warnings":["No documentation available — docs, pricing, and README pages all return only 'Connect wallet' with no content","The specific functionality of /api/v1/payments/356 ('Premium API Access') is completely undocumented","No OpenAPI schema or request/response examples exist for any endpoint on this provider","Cannot verify what data or service is returned after payment"],"endpointUrl":"https://lowpaymentfee.com/api/v1/payments/356","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/356","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 402 challenge, but there is zero documentation on what the endpoint actually does or returns. No OpenAPI schema, no request/response examples, and the docs pages are empty. The label 'Premium API Access' is generic and uninformative. The provider lists many endpoints but documents none of 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'/call':102 '/request':13,28 '0.02':12,27,87,101,155 '000':78 '20':77 '402':226 '6':83 'Base network API' 'USDC micropayment API' 'accept':59 'access':7,22,57,167,183 'actual':231 'advertis':73,151 'ai':122 'analysi':126 'analyt':116 'api':6,21,42,56,160,182 'base':9,24,68,79 'base-network' 'behind':172 'beyond':177 'broad':110 'call':4,19 'catalog':111 'challeng':72,227 'classif':129 'connect':194 'consist':90 'content':200 'convers':146 'crypto-paid API' 'data':115,119 'decim':84 'detail':211 'doc':185 'document':176,212 'embed':130 'enabl':41 'endpoint':32,43,113,149,218,220 'equal':86 'estim':140 'exampl':208 'exchang':135 'export':120 'feed':134 'financ':131 'flat':98 'function':171 'gas':139 'generat':147 'generic':179 'geocod':144 'howev':168 'infrastructur':142 'insight':121 'instant':166 'key':161 'label':54,180 'land':106 'learn':124 'limit':164 'list':108 'live':222 'lowpaymentfee' 'lowpaymentfee.com':34 'machin':123 'mani':38 'maxamountrequir':75 'metric':117 'network':69 'no-api-key' 'offer':44 'one':36 'openapi':204 'page':107,189 'pay':2,17 'pay-per-cal':1,16 'pay-per-call API' 'pay-per-request' 'payment':63,234 'per':3,18,88 'point':157 'post':60 'premium':5,20,55,181 'premium API access' 'price':99,133,156,186 'prompt':196 'provid':47,93,104 'quot':138 'rate':136,163 'readm':188 'report':118 'request':61,89 'request/response':207 'resourc':50 'return':191,223,232 'schema':205 'sentiment':125 'settl':62 'site':96 'site-wid':95 'span':114 'specif':49,170 'substant':199 'summar':128 'text':127 'token':137 'unit':80 'unknown':236 'usdc':15,30,65,82 'usdc-settlement' 'util':143 'valid':145,225 'via':10,25 'wallet':195 'web3':132 'wide':97 'x402':11,26,40,71 'x402 API' 'x402-enabled':39 'x402-payment'","prices":[{"id":"a960c033-c6d9-4ce4-92a8-9ccc29bdbe67","listingId":"933652e2-9359-4a91-996a-90e497fe8700","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/356","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:50:30.157Z"}],"sources":[{"listingId":"933652e2-9359-4a91-996a-90e497fe8700","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/payments/356","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:50:30.157Z","lastSeenAt":"2026-04-23T11:03:35.034Z"}],"details":{"listingId":"933652e2-9359-4a91-996a-90e497fe8700","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/payments/356 \\\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 x402 challenge advertises maxAmountRequired of 20000 base units of USDC on Base network","source_url":"https://lowpaymentfee.com/api/v1/payments/356"},{"claim":"The provider lists endpoints across data & analytics, AI & ML, finance & Web3, and infrastructure categories all at $0.02/request","source_url":"https://lowpaymentfee.com"},{"claim":"The provider advertises no API keys, no rate limits, instant access, and Base network settlement","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/payments/356"}],"useCases":["Agent-initiated API calls with per-request USDC micropayments on Base","Accessing premium data or services without traditional API key registration","Programmatic pay-as-you-go access to undocumented premium functionality"],"bestFor":["Developers or agents wanting keyless, pay-per-call API access settled in USDC on Base","Users comfortable with x402 payment protocol for micropayments","Scenarios where $0.02/request flat pricing is attractive"],"notFor":["Users who need detailed documentation or guaranteed SLAs before paying","Anyone requiring non-crypto payment methods","Production use cases that need well-documented request/response schemas"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:06.911Z"},"updatedAt":"2026-04-23T11:03:35.034Z"}}