{"id":"29c9ae16-9711-447b-950d-09fa20486d3c","shortId":"RaZ6mG","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. The site hosts a broad catalog of pay-per-request APIs spanning data & analytics, AI/ML inference (sentiment analysis, summarization, classification, embeddings), finance & Web3 (price feeds, exchange rates, token quotes, gas estimates), and infrastructure utilities (geocoding, validation, conversion, generation). Each call costs $0.02 in USDC on the Base network, with no API keys, no rate limits, and no minimum commitments required.\n\nThe specific resource probed (/api/v1/generate/resource/51) is listed under \"Premium API Access\" and returned a valid x402 challenge with a maxAmountRequired of 20,000 base units of USDC (0.02 USD, since USDC uses 6 decimals). Payment is settled on-chain to address 0x1A2B…85F3 using the USDC contract on Base (0x8335…2913). The endpoint accepts POST requests and returns application/json responses.\n\nDocumentation is extremely sparse — the /docs, /pricing, /api, and /README pages all render only a \"Connect wallet\" prompt with no further content. There is no OpenAPI spec, no request/response schema documentation, and no usage examples available. The exact functionality behind \"resource/51\" is unclear; the endpoint name suggests some form of content or data generation, but without documentation the specific input parameters and output format cannot be confirmed.","tags":[],"capabilities":["x402-payment","usdc-base","pay-per-request","json-api","post-method","no-api-key","crypto-settlement"],"categories":["infrastructure","general"],"synonyms":["x402 API","pay-per-call API","USDC micropayment API","Base network API","lowpaymentfee","premium API access","crypto-paid endpoint"],"warnings":["No API documentation available — /docs, /pricing, /api, and /README pages all show only 'Connect wallet'","No OpenAPI or schema definition found; request parameters and response format are unknown","The exact functionality of /api/v1/generate/resource/51 ('Premium API Access') is not described anywhere","The site lists many endpoints across diverse categories but provides no technical details for any of them"],"endpointUrl":"https://lowpaymentfee.com/api/v1/generate/resource/51","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/generate/resource/51","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 with clear pricing. However, there is no OpenAPI spec, no request/response schema, no documentation beyond a wallet-connect prompt, and the specific functionality of 'resource/51' is undocumented. This is effectively a stub 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'/api/v1/generate/resource/51':109 '/docs':171 '/pricing':172 '/readme':175 '/request':13,28 '0.02':12,27,86,132 '000':127 '0x1a2b':147 '0x8335':155 '20':126 '2913':156 '6':137 '85f3':148 'Base network API' 'USDC micropayment API' 'accept':159 'access':7,22,38,115 'address':146 'ai/ml':59 'analysi':62 'analyt':58 'api':6,21,37,55,95,114 'application/json':164 'avail':201 'base':9,24,91,128,154 'behind':205 'broad':48 'call':4,19,84 'cannot':230 'catalog':49 'chain':144 'challeng':121 'classif':64 'commit':103 'confirm':232 'connect':181 'content':187,216 'contract':152 'convers':81 'cost':85 'crypto-paid endpoint' 'crypto-settlement' 'data':57,218 'decim':138 'document':166,196,222 'embed':65 'endpoint':32,158,210 'estim':75 'exact':203 'exampl':200 'exchang':70 'extrem':168 'feed':69 'financ':66 'form':214 'format':229 'function':204 'gas':74 'generat':82,219 'geocod':79 'host':46 'infer':60 'infrastructur':77 'input':225 'json-api' 'key':96 'limit':99 'list':111 'lowpaymentfee' 'lowpaymentfee.com':34 'maxamountrequir':124 'minimum':102 'name':211 'network':92 'no-api-key' 'on-chain':142 'openapi':191 'output':228 'page':176 'paramet':226 'pay':2,17,52 'pay-per-cal':1,16 'pay-per-call API' 'pay-per-request':51 'payment':42,139 'per':3,18,53 'post':160 'post-method' 'premium':5,20,36,113 'premium API access' 'price':68 'probe':108 'prompt':183 'protocol':43 'provid':35 'quot':73 'rate':71,98 'render':178 'request':54,161 'request/response':194 'requir':104 'resourc':107 'resource/51':206 'respons':165 'return':117,163 'schema':195 'sentiment':61 'settl':141 'sinc':134 'site':45 'span':56 'spars':169 'spec':192 'specif':106,224 'suggest':212 'summar':63 'token':72 'unclear':208 'unit':129 'usag':199 'usd':133 'usdc':15,30,88,131,135,151 'usdc-base' 'use':136,149 'util':78 'valid':80,119 'via':10,25,39 'wallet':182 'web3':67 'without':221 'x402':11,26,41,120 'x402 API' 'x402-payment'","prices":[{"id":"9faaefd1-ac23-4814-921d-822af67339d0","listingId":"29c9ae16-9711-447b-950d-09fa20486d3c","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/generate/resource/51","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:37:26.961Z"}],"sources":[{"listingId":"29c9ae16-9711-447b-950d-09fa20486d3c","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/generate/resource/51","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:37:26.961Z","lastSeenAt":"2026-04-22T11:31:06.604Z"}],"details":{"listingId":"29c9ae16-9711-447b-950d-09fa20486d3c","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/generate/resource/51 \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402-payment-token>\" \\\n  -d '{}'","exampleRequest":null,"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"The endpoint returns a valid x402 challenge with maxAmountRequired of 20000 base units of USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/generate/resource/51"},{"claim":"All APIs 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 site offers APIs across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"},{"claim":"Documentation pages (/docs, /pricing, /api, /README) render only a 'Connect wallet' prompt","source_url":"https://lowpaymentfee.com/docs"}],"useCases":["Accessing pay-per-request API services without needing API keys or subscriptions","Making micropayment-gated API calls settled in USDC on Base","Agent-driven workflows that need on-demand API access with crypto payments"],"bestFor":["Developers wanting zero-commitment, pay-as-you-go API access","AI agents that can settle x402 payments autonomously on Base","Users who prefer crypto-native micropayments over traditional API billing"],"notFor":["Users who need detailed API documentation or guaranteed SLAs before integrating","Applications requiring non-crypto payment methods","High-volume use cases where per-request pricing may be less economical than bulk plans"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:44.936Z"},"updatedAt":"2026-04-22T11:31:06.604Z"}}