{"id":"01b757a9-c678-49ae-ae8f-414ac86e692d","shortId":"4YGfRh","kind":"x402","title":"x402-gated premium API endpoint on Base, pay-per-request with USDC.","tagline":"x402-gated premium API endpoint on Base, pay-per-request with USDC.","description":"This endpoint at lowpaymentfee.com/api/resource/39 is an x402 protocol-gated API labeled \"Premium API Access.\" It accepts POST requests and returns application/json responses. Payment is handled via the x402 exact scheme on the Base network using USDC (contract 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913), with a maximum cost of 20,000 units (in USDC's 6-decimal representation, this equates to $0.02 per request).\n\nThe provider site lowpaymentfee.com hosts a collection 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 advertised at $0.02 per request with no API keys, no rate limits, and no commitments required.\n\nHowever, this specific endpoint (/api/resource/39) does not correspond to any of the documented API paths on the provider's landing page, which use versioned routes like /api/v1/ and /api/v2/. There is no documentation, schema, or description explaining what /api/resource/39 actually does beyond the generic label \"Premium API Access.\" The docs, pricing, and other pages returned only a wallet-connect prompt with no substantive content. Without further documentation, the exact functionality of this endpoint remains unknown.","tags":[],"capabilities":["x402-payment","usdc-payment","base-network","pay-per-request","json-response","post-method"],"categories":["api","misc"],"synonyms":["premium API","paid API","x402 endpoint","USDC API","Base network API","lowpaymentfee","micropayment API"],"warnings":["Endpoint path /api/resource/39 does not match any documented API route on the provider's landing page","No documentation, input schema, or output schema available for this specific endpoint","Docs, pricing, and README pages returned no useful content (only wallet-connect prompts)","Actual functionality of this endpoint is completely unknown"],"endpointUrl":"https://lowpaymentfee.com/api/resource/39","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/resource/39","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.250","qualityRationale":"The endpoint is live (402 challenge confirmed) and payment parameters are clear, but there is zero documentation on what /api/resource/39 actually does. The path doesn't match any documented route on the site. No input/output schema, no examples, and all secondary pages returned only wallet-connect 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'/api/v1':176 '/api/v2':178 '0.02':87,136 '000':76 '0x833589fcd6edb6e08f4c7c32d4f71b54bda02913':69 '20':75 '6':81 'Base network API' 'USDC API' 'accept':47 'access':45,197 'actual':189 'advertis':134 'ai':106 'analysi':110 'analyt':105 'api':5,19,41,44,102,141,163,196 'application/json':52 'base':8,22,64 'base-network' 'beyond':191 'classif':112 'collect':96 'commit':148 'connect':209 'content':214 'contract':68 'convers':129 'correspond':157 'cost':73 'data':104 'decim':82 'descript':185 'doc':199 'document':162,182,217 'embed':113 'endpoint':6,20,30,132,153,223 'equat':85 'estim':123 'exact':60,219 'exchang':118 'explain':186 'feed':117 'financ':114 'function':220 'gas':122 'gate':3,17,40 'generat':130 'generic':193 'geocod':127 'handl':56 'host':94 'howev':150 'infrastructur':125 'json-response' 'key':142 'label':42,194 'land':169 'learn':108 'like':175 'limit':145 'lowpaymentfee' 'lowpaymentfee.com':33,93 'lowpaymentfee.com/api/resource/39':32 'machin':107 'maximum':72 'micropayment API' 'network':65 'page':170,203 'paid API' 'path':164 'pay':10,24,99 'pay-per-request':9,23,98 'payment':54 'per':11,25,88,100,137 'post':48 'post-method' 'premium':4,18,43,195 'premium API' 'price':116,200 'prompt':210 'protocol':39 'protocol-g':38 'provid':91,167 'quot':121 'rate':119,144 'remain':224 'represent':83 'request':12,26,49,89,101,138 'requir':149 'respons':53 'return':51,204 'rout':174 'schema':183 'scheme':61 'sentiment':109 'site':92 'span':103 'specif':152 'substant':213 'summar':111 'token':120 'unit':77 'unknown':225 'usdc':14,28,67,79 'usdc-payment' 'use':66,172 'util':126 'valid':128 'version':173 'via':57 'wallet':208 'wallet-connect':207 'web3':115 'without':215 'x402':2,16,37,59 'x402 endpoint' 'x402-gated':1,15 'x402-payment'","prices":[{"id":"6161d148-0583-46b0-9798-f3cad081b5b9","listingId":"01b757a9-c678-49ae-ae8f-414ac86e692d","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/resource/39","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:31:54.239Z"}],"sources":[{"listingId":"01b757a9-c678-49ae-ae8f-414ac86e692d","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/resource/39","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:31:54.239Z","lastSeenAt":"2026-04-22T15:00:21.357Z"}],"details":{"listingId":"01b757a9-c678-49ae-ae8f-414ac86e692d","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/resource/39\n# Returns 402 with x402 payment challenge.\n# Include X-PAYMENT header with a valid x402 payment token (USDC on Base) to access the resource.","exampleRequest":null,"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"The endpoint returns a 402 challenge with x402Version 1, accepting USDC on Base network with maxAmountRequired of 20000","source_url":"https://lowpaymentfee.com/api/resource/39"},{"claim":"The provider advertises APIs across data & analytics, AI & ML, finance & Web3, and infrastructure categories at $0.02 per request","source_url":"https://lowpaymentfee.com"},{"claim":"The site claims no API keys, no rate limits, instant access, and Base network payments","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset contract is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/resource/39"}],"useCases":["Accessing a pay-per-request API without needing API keys or subscriptions","Making programmatic payments via x402 protocol on the Base network","Agent-driven API consumption with per-call USDC micropayments"],"bestFor":["Developers experimenting with x402 pay-per-request protocols","Agents that can handle on-chain USDC payments on Base","Use cases requiring keyless, commitment-free API access"],"notFor":["Users who need clear documentation on what the endpoint returns","Production workloads requiring well-documented and stable API contracts","Anyone unable to transact USDC on the Base network"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-27T08:16:43.693Z"},"updatedAt":"2026-04-22T15:00:21.357Z"}}