{"id":"93973964-20b5-40df-9c64-e8861b07b855","shortId":"qY5Nkn","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 at `/api/v1/transfers/38` is labeled \"Premium API Access\" and requires a POST request with an x402 payment header. The 402 challenge indicates a maximum cost of 20,000 base units of USDC (0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913), which equals $0.02 per request (USDC uses 6 decimals). No API keys or rate limits are advertised.\n\nThe broader 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 the same $0.02/request price point.\n\nHowever, the specific functionality behind the `/api/v1/transfers/38` endpoint is unclear. The endpoint path suggests a transfer-related resource, but the description is generic (\"Premium API Access\") and no request/response schema documentation is available. The docs, pricing, and API pages all returned only a \"Connect wallet\" prompt with no further content. Without documentation or example payloads, the actual behavior of this endpoint cannot be confirmed.","tags":[],"capabilities":["x402-payment","usdc-base-network","pay-per-request","no-api-key","post-endpoint","json-response"],"categories":["api-platform","crypto"],"synonyms":["x402 API","pay per call API","USDC API","Base network API","micropayment API","lowpaymentfee","402 payment API"],"warnings":["No documentation available — docs, pricing, and API pages all return only 'Connect wallet' with no content","The specific functionality of /api/v1/transfers/38 is unknown; the path suggests transfers but the description is generic","No request body schema or response schema is documented anywhere","No OpenAPI spec, no AI plugin manifest, no agents.txt found"],"endpointUrl":"https://lowpaymentfee.com/api/v1/transfers/38","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/38","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.300","qualityRationale":"The endpoint is live (402 challenge confirmed) and pricing is clear ($0.02 USDC on Base), but there is no documentation, no request/response schema, and no explanation of what the /transfers/38 endpoint actually does. The docs, pricing, and API pages are all empty beyond a wallet-connect prompt. This is effectively a stub 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'/request':13,28,154 '0.02':12,27,90,153 '000':82 '0x833589fcd6edb6e08f4c7c32d4f71b54bda02913':87 '20':81 '402':74 '402 payment API' '6':95 'Base network API' 'USDC API' 'accept':46 'access':62,183 'across':110 'actual':214 'advertis':104 'ai':120 'analysi':124 'analyt':114 'api':5,20,38,61,98,182,195 'avail':190 'base':8,23,51,83 'behavior':215 'behind':161 'broader':106 'call':4,19 'cannot':219 'categori':112 'challeng':75 'classif':127 'confirm':221 'connect':201 'content':207 'convers':144 'cost':79 'data':113,117 'decim':96 'descript':178 'doc':192 'document':188,209 'embed':128 'endpoint':55,109,147,164,168,218 'equal':89 'estim':138 'exampl':211 'exchang':133 'export':118 'feed':132 'financ':129 'four':111 'function':160 'gas':137 'generat':145 'generic':180 'geocod':142 'header':72 'howev':157 'indic':76 'infrastructur':140 'insight':119 'json-response' 'key':99 'label':59 'learn':122 'limit':102 'list':149 'lowpaymentfee' 'lowpaymentfee.com':31 'machin':121 'maximum':78 'metric':115 'micropayment API' 'network':9,24,52 'no-api-key' 'offer':108 'page':196 'path':169 'pay':2,17,35 'pay per call API' 'pay-per-cal':1,16 'pay-per-request':34 'payload':212 'payment':48,71 'per':3,18,36,91 'platform':6,21,39,107 'point':156 'post':66 'post-endpoint' 'premium':60,181 'price':131,155,193 'prompt':203 'protocol':44 'quot':136 'rate':101,134 'relat':174 'report':116 'request':37,67,92 'request/response':186 'requir':64 'resourc':175 'return':198 'schema':187 'sentiment':123 'specif':54,159 'suggest':170 'summar':126 'text':125 'token':135 'transfer':173 'transfer-rel':172 'unclear':166 'unit':84 'usdc':15,30,47,86,93 'usdc-base-network' 'use':41,94 'util':141 'valid':143 'via':10,25 'wallet':202 'web3':130 'without':208 'x402':11,26,43,70 'x402 API' 'x402-payment'","prices":[{"id":"c49e8f3e-0a1a-4f0f-9417-2a9e2a187ac7","listingId":"93973964-20b5-40df-9c64-e8861b07b855","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/38","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T19:27:49.398Z"}],"sources":[{"listingId":"93973964-20b5-40df-9c64-e8861b07b855","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/transfers/38","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T19:27:49.398Z","lastSeenAt":"2026-04-23T00:32:30.567Z"}],"details":{"listingId":"93973964-20b5-40df-9c64-e8861b07b855","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/transfers/38 \\\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 endpoint returns a 402 challenge with maxAmountRequired of 20000 base units of USDC on Base network","source_url":"https://lowpaymentfee.com/api/v1/transfers/38"},{"claim":"All endpoints are priced at $0.02/request with no API keys, no rate limits, and instant access on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"The platform offers endpoints across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset address is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 (Base network USDC)","source_url":"https://lowpaymentfee.com/api/v1/transfers/38"}],"useCases":["Programmatic access to paid API endpoints without traditional API key registration","Agent-driven workflows that need to pay per call using USDC on Base","Testing x402 protocol integrations with low-cost endpoints"],"bestFor":["Developers experimenting with x402 payment protocol","AI agents that need keyless, pay-per-use API access","Users who want to avoid subscription commitments for API usage"],"notFor":["Users who need detailed API documentation or guaranteed SLAs","High-volume use cases where $0.02/request adds up significantly","Anyone without a Base-network USDC wallet"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:33.983Z"},"updatedAt":"2026-04-23T00:32:30.567Z"}}