{"id":"fbf489f7-ad74-4789-9013-6a60905d7110","shortId":"hxsSfd","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/transactions/192` is listed as \"Premium API Access\" and returns a 402 challenge requesting up to 20,000 base units of USDC (i.e., $0.02) 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 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 priced at $0.02 per request.\n\nThe specific functionality behind `/api/v1/transactions/192` is not documented beyond the label \"Premium API Access.\" The docs, pricing, and API pages all render only a \"Connect wallet\" prompt with no further detail. Without additional documentation or example responses, the exact data returned by this endpoint is unknown. The output schema indicates it accepts HTTP POST requests and is discoverable.","tags":[],"capabilities":["x402-payment","usdc-base-network","pay-per-request","no-api-key","http-post","json-response"],"categories":["api-platform","finance"],"synonyms":["x402 API","pay-per-call API","USDC micropayment API","Base network API","lowpaymentfee","low payment fee API","crypto-paid API"],"warnings":["No documentation available — docs, pricing, and API pages all show only 'Connect wallet'","The specific functionality of /api/v1/transactions/192 is completely undocumented","No response schema or example responses are available","This endpoint path contains a numeric ID (192) with no explanation of what it references"],"endpointUrl":"https://lowpaymentfee.com/api/v1/transactions/192","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/transactions/192","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 402 challenge, but there is virtually no documentation about what data it returns. The docs, pricing, and API pages all render only 'Connect wallet' with no usable content. The endpoint path '/api/v1/transactions/192' with a numeric ID is opaque, and 'Premium API Access' is a generic label. Without example responses or schema details, this is effectively a stub 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'/request':13,28 '0.02':12,27,78,153 '000':72 '20':71 '402':66 'Base network API' 'USDC micropayment API' 'accept':46,207 'access':62,92,169 'across':112 'addit':188 'advertis':83 'ai':122 'analysi':126 'analyt':116 'api':5,20,38,61,85,168,174 'attach':95 'base':8,23,51,73 'behind':159 'beyond':164 'broader':108 'call':4,19,80 'caller':93 'categori':114 'challeng':67 'classif':129 'connect':180 'convers':146 'crypto-paid API' 'data':115,119,195 'detail':186 'discover':213 'doc':171 'document':163,189 'embed':130 'endpoint':55,111,149,199 'estim':140 'exact':194 'exampl':191 'exchang':135 'export':120 'feed':134 'financ':131 'four':113 'function':158 'gas':139 'generat':147 'geocod':144 'header':100 'http':208 'http-post' 'i.e':77 'indic':205 'infrastructur':142 'insight':121 'instant':91 'json-response' 'key':86 'label':166 'learn':124 'limit':89 'list':58 'low payment fee API' 'lowpaymentfee' 'lowpaymentfee.com':31 'machin':123 'metric':117 'network':9,24,52 'no-api-key' 'offer':110 'output':203 'page':175 'pay':2,17,35 'pay-per-cal':1,16 'pay-per-call API' 'pay-per-request':34 'payment':48,99,105 'per':3,18,36,79,154 'platform':6,21,39,82,109 'post':209 'premium':60,167 'price':133,151,172 'prompt':182 'proof':106 'protocol':44 'quot':138 'rate':88,136 'render':177 'report':118 'request':37,68,155,210 'respons':192 'return':64,196 'schema':204 'sentiment':125 'simpli':94 'specif':54,157 'summar':128 'text':127 'token':137 'unit':74 'unknown':201 'usdc':15,30,47,76 'usdc-base-network' 'use':41 'util':143 'valid':103,145 'via':10,25 'wallet':181 'web3':132 'without':187 'x':98 'x-payment':97 'x402':11,26,43,104 'x402 API' 'x402-payment'","prices":[{"id":"677b0e7c-62b4-4de3-ba43-38ec509a2a75","listingId":"fbf489f7-ad74-4789-9013-6a60905d7110","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/transactions/192","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:59:00.029Z"}],"sources":[{"listingId":"fbf489f7-ad74-4789-9013-6a60905d7110","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/transactions/192","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:59:00.029Z","lastSeenAt":"2026-04-23T19:01:45.529Z"}],"details":{"listingId":"fbf489f7-ad74-4789-9013-6a60905d7110","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/transactions/192 \\\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 ($0.02) on Base network","source_url":"https://lowpaymentfee.com/api/v1/transactions/192"},{"claim":"The platform advertises $0.02/request pricing with no API keys, no rate limits, and instant access","source_url":"https://lowpaymentfee.com"},{"claim":"The USDC asset contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/transactions/192"},{"claim":"The platform offers endpoints across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"}],"useCases":["Accessing premium API data without traditional API key registration","Making one-off API calls paid in USDC on Base","Agent-driven workflows that need keyless, pay-as-you-go API access"],"bestFor":["Developers who want to avoid API key management and subscriptions","AI agents that can settle x402 payments autonomously","Users already holding USDC on the Base network"],"notFor":["Users who need detailed API documentation or guaranteed SLAs","Anyone without USDC on Base or an x402-compatible payment client"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:42.491Z"},"updatedAt":"2026-04-23T19:01:45.529Z"}}