{"id":"7b8edb67-105e-45c4-8784-b1c903cec42e","shortId":"wJQJxm","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 `/api/resource/29` is part of the lowpaymentfee.com platform, which offers a collection of x402-protocol pay-per-request APIs spanning data & analytics, AI & machine learning, finance & Web3, and infrastructure utilities. The specific resource behind `/api/resource/29` is labeled \"Premium API Access\" but its exact functionality is not documented — the site lists many endpoints under versioned paths (e.g., `/api/v1/analytics/metrics`, `/api/v2/ai/sentiment`) but `/api/resource/29` does not appear among them.\n\nPayment is handled via the x402 protocol on the Base network using USDC (contract `0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913`). The 402 challenge specifies a maximum amount of 20,000 units (in USDC's 6-decimal representation, this equals $0.02), consistent with the site's advertised flat rate of $0.02 per request. No API keys are required; access is granted per-request upon payment. The endpoint accepts HTTP POST and returns `application/json`.\n\nDocumentation is extremely sparse. The docs, pricing, API, and README pages all render only a \"Connect wallet\" prompt with no additional content. There is no OpenAPI schema, no request/response examples, and no description of what data or service `/api/resource/29` actually provides. The endpoint is live (returns a proper 402 challenge), but without knowing what it does, callers must treat it as an opaque premium resource.","tags":[],"capabilities":["x402-payment","usdc-payment","base-network","pay-per-request","http-post","json-response"],"categories":["general","pay-per-use"],"synonyms":["lowpaymentfee","low payment fee API","x402 premium API","USDC API access","Base network API","micropayment API"],"warnings":["The specific endpoint /api/resource/29 is not listed among the site's documented APIs — its purpose is unknown.","All documentation pages (docs, pricing, API, README) render only 'Connect wallet' with no useful content.","No OpenAPI schema, no request body schema, and no example responses are available.","Cannot confirm what data or service is returned after payment."],"endpointUrl":"https://lowpaymentfee.com/api/resource/29","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/29","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.250","qualityRationale":"The endpoint is live and returns a valid 402 challenge, but there is zero documentation on what /api/resource/29 actually does, no request/response schema, and the docs pages are empty. The listing is effectively a 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'/api/v1/analytics/metrics':89 '/api/v2/ai/sentiment':90 '0.02':132,142 '000':122 '0x833589fcd6edb6e08f4c7c32d4f71b54bda02913':112 '20':121 '402':114,214 '6':127 'Base network API' 'USDC API access' 'accept':160 'access':72,150 'actual':205 'addit':186 'advertis':138 'ai':55 'among':96 'amount':119 'analyt':54 'api':5,19,51,71,146,173 'appear':95 'application/json':165 'base':8,22,107 'base-network' 'behind':66 'caller':222 'challeng':115,215 'collect':42 'connect':181 'consist':133 'content':187 'contract':111 'data':53,201 'decim':128 'descript':198 'doc':171 'document':79,166 'e.g':88 'endpoint':6,20,30,84,159,208 'equal':131 'exact':75 'exampl':195 'extrem':168 'financ':58 'flat':139 'function':76 'gate':3,17 'grant':152 'handl':100 'http':161 'http-post' 'infrastructur':61 'json-response' 'key':147 'know':218 'label':69 'learn':57 'list':82 'live':210 'low payment fee API' 'lowpaymentfee' 'lowpaymentfee.com':37 'machin':56 'mani':83 'maximum':118 'micropayment API' 'must':223 'network':108 'offer':40 'opaqu':228 'openapi':191 'page':176 'part':34 'path':87 'pay':10,24,48 'pay-per-request':9,23,47 'payment':98,157 'per':11,25,49,143,154 'per-request':153 'platform':38 'post':162 'premium':4,18,70,229 'price':172 'prompt':183 'proper':213 'protocol':46,104 'provid':206 'rate':140 'readm':175 'render':178 'represent':129 'request':12,26,50,144,155 'request/response':194 'requir':149 'resourc':65,230 'return':164,211 'schema':192 'servic':203 'site':81,136 'span':52 'spars':169 'specif':64 'specifi':116 'treat':224 'unit':123 'upon':156 'usdc':14,28,110,125 'usdc-payment' 'use':109 'util':62 'version':86 'via':101 'wallet':182 'web3':59 'without':217 'x402':2,16,45,103 'x402 premium API' 'x402-gated':1,15 'x402-payment' 'x402-protocol':44","prices":[{"id":"f1a7ca50-6c5e-4bb4-ad93-81a1e7234f66","listingId":"7b8edb67-105e-45c4-8784-b1c903cec42e","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/29","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:31:59.089Z"}],"sources":[{"listingId":"7b8edb67-105e-45c4-8784-b1c903cec42e","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/resource/29","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:31:59.089Z","lastSeenAt":"2026-04-22T15:00:21.661Z"}],"details":{"listingId":"7b8edb67-105e-45c4-8784-b1c903cec42e","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/resource/29\n# Returns 402 with X-PAYMENT challenge; attach a valid x402 payment header 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 maxAmountRequired of 20000 USDC units on Base network","source_url":"https://lowpaymentfee.com/api/resource/29"},{"claim":"The site advertises $0.02 per request with no API keys, no rate limits, and instant access on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset contract is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/resource/29"},{"claim":"The site lists various API categories including Data & Analytics, AI & ML, Finance & Web3, and Infrastructure","source_url":"https://lowpaymentfee.com"}],"useCases":["Accessing a pay-per-request premium resource without API key registration","Programmatic agent-driven API consumption via x402 payment protocol","Integrating USDC micropayments into automated workflows"],"bestFor":["Developers or agents wanting keyless, pay-per-call API access","x402-compatible agents on the Base network","Quick experimentation with micropayment-gated endpoints"],"notFor":["Users who need detailed documentation or guaranteed SLAs before calling","Bulk or high-volume consumers who need subscription pricing","Anyone needing to know exactly what the endpoint returns before paying"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:15:00.985Z"},"updatedAt":"2026-04-22T15:00:21.661Z"}}