{"id":"d4ec0507-d7e7-484c-8462-dbad3419db5e","shortId":"9DgXwj","kind":"x402","title":"Pay-per-call API platform on Base network via x402 — $0.02/request in USDC.","tagline":"Pay-per-call API platform on Base network via x402 — $0.02/request in USDC.","description":"lowpaymentfee.com is a pay-per-request API platform that uses the x402 protocol to accept USDC payments on the Base network. The specific endpoint `/api/v1/transfers/130` is listed as \"Premium API Access\" and returns a 402 challenge requesting up to 20,000 base units of USDC (i.e., $0.02 given USDC's 6 decimals) per call. The platform advertises no API keys, no rate limits, and instant access — callers simply attach an X-PAYMENT header with a valid x402 payment proof.\n\nThe broader lowpaymentfee.com platform offers endpoints across four categories: 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 listed at $0.02 per request.\n\nThe specific functionality behind `/api/v1/transfers/130` is not documented beyond the label \"Premium API Access.\" No OpenAPI schema, request/response examples, or detailed documentation were found in the crawl. The docs, API, pricing, and README pages all returned only a \"Connect wallet\" prompt with no substantive content. Callers should be aware that the actual behavior of this endpoint is unclear from available materials.","tags":[],"capabilities":["x402-payment","usdc-base-network","pay-per-request","no-api-key","http-post"],"categories":["infrastructure","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, API, pricing, and README pages all show only 'Connect wallet'","The specific functionality of /api/v1/transfers/130 ('Premium API Access') is undocumented and unclear","No OpenAPI or output schema beyond basic HTTP method info","No request or response examples available","The platform lists many endpoint categories but none have detailed specs"],"endpointUrl":"https://lowpaymentfee.com/api/v1/transfers/130","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/transfers/130","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 x402 402 challenge, but there is no documentation, no OpenAPI schema, no request/response examples, and the actual functionality behind 'Premium API Access' at /api/v1/transfers/130 is completely opaque. All doc pages return only 'Connect wallet' with no 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'/request':13,28 '0.02':12,27,78,159 '000':72 '20':71 '402':66 '6':82 'Base network API' 'USDC micropayment API' 'accept':46 'access':62,97,175 'across':118 'actual':213 'advertis':88 'ai':128 'analysi':132 'analyt':122 'api':5,20,38,61,90,174,191 'attach':100 'avail':221 'awar':210 'base':8,23,51,73 'behavior':214 'behind':165 'beyond':170 'broader':113 'call':4,19,85 'caller':98,207 'categori':120 'challeng':67 'classif':135 'connect':200 'content':206 'convers':152 'crawl':188 'crypto-paid API' 'data':121,125 'decim':83 'detail':182 'doc':190 'document':169,183 'embed':136 'endpoint':55,117,155,217 'estim':146 'exampl':180 'exchang':141 'export':126 'feed':140 'financ':137 'found':185 'four':119 'function':164 'gas':145 'generat':153 'geocod':150 'given':79 'header':105 'http-post' 'i.e':77 'infrastructur':148 'insight':127 'instant':96 'key':91 'label':172 'learn':130 'limit':94 'list':58,157 'lowpaymentfee' 'lowpaymentfee.com':31,114 'machin':129 'materi':222 'metric':123 'network':9,24,52 'no-api-key' 'offer':116 'openapi':177 'page':195 'pay':2,17,35 'pay-per-cal':1,16 'pay-per-call API' 'pay-per-request':34 'payment':48,104,110 'per':3,18,36,84,160 'platform':6,21,39,87,115 'premium':60,173 'premium API access' 'price':139,192 'prompt':202 'proof':111 'protocol':44 'quot':144 'rate':93,142 'readm':194 'report':124 'request':37,68,161 'request/response':179 'return':64,197 'schema':178 'sentiment':131 'simpli':99 'specif':54,163 'substant':205 'summar':134 'text':133 'token':143 'unclear':219 'unit':74 'usdc':15,30,47,76,80 'usdc-base-network' 'use':41 'util':149 'valid':108,151 'via':10,25 'wallet':201 'web3':138 'x':103 'x-payment':102 'x402':11,26,43,109 'x402 API' 'x402-payment'","prices":[{"id":"fc263d18-2a5d-40c8-af47-75b52f95cb33","listingId":"d4ec0507-d7e7-484c-8462-dbad3419db5e","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/transfers/130","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T19:27:25.794Z"}],"sources":[{"listingId":"d4ec0507-d7e7-484c-8462-dbad3419db5e","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/transfers/130","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T19:27:25.794Z","lastSeenAt":"2026-04-22T12:04:42.990Z"}],"details":{"listingId":"d4ec0507-d7e7-484c-8462-dbad3419db5e","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/transfers/130 \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402-payment-proof>\"","exampleRequest":null,"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"The endpoint returns a 402 challenge requesting up to 20,000 base units of USDC on Base network","source_url":"https://lowpaymentfee.com/api/v1/transfers/130"},{"claim":"USDC asset contract on Base: 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/transfers/130"},{"claim":"Platform advertises $0.02/request, no API keys, no rate limits, instant access, Base network","source_url":"https://lowpaymentfee.com"},{"claim":"Platform offers endpoints in Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"},{"claim":"Docs, API, pricing, and README pages return only 'Connect wallet' with no substantive content","source_url":"https://lowpaymentfee.com/docs"}],"useCases":["Programmatic access to a premium API endpoint with per-call USDC micropayments","Agent-driven workflows that need keyless, pay-as-you-go API access on Base","Testing x402 payment flows against a live endpoint"],"bestFor":["Developers experimenting with x402 protocol payments","Agents that need keyless API access settled in USDC on Base","Low-volume, pay-per-use API consumption without subscriptions"],"notFor":["Users who need detailed API documentation or guaranteed SLAs","High-volume use cases where per-request crypto payments add overhead","Anyone who needs to understand the exact response schema before integrating"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:35.04Z"},"updatedAt":"2026-04-22T12:04:42.990Z"}}