{"id":"07fff96f-8f6d-4881-8b60-a0c21fb7c2c6","shortId":"XquuuZ","kind":"x402","title":"Pay-per-call API platform on Base network via x402 — $0.02/request, no API keys required.","tagline":"Pay-per-call API platform on Base network via x402 — $0.02/request, no API keys required.","description":"lowpaymentfee.com is an x402-enabled API platform that offers a broad set of endpoints across data analytics, AI/ML inference, finance/Web3 data, and infrastructure utilities. All endpoints are paid per-request using USDC on the Base network via the x402 protocol, with no API keys, rate limits, or upfront commitments required.\n\nThe specific endpoint at `/api/v1/transactions/295` is listed as \"Premium API Access\" and accepts POST requests. Its x402 challenge advertises a maximum cost of 20,000 base units of USDC (asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base), which equals $0.02 per request (USDC uses 6 decimals). Payment is made via the x402 exact scheme to the payee address 0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3, with a 300-second timeout window.\n\nThe broader platform advertises categories including metrics, reports, data export, insights, sentiment analysis, text summarization, classification, embeddings, price feeds, exchange rates, token quotes, gas estimates, geocoding, validation, conversion, and generation — all at the same $0.02/request price point. However, documentation pages (docs, pricing, README) returned only a \"Connect wallet\" prompt with no substantive content, so the actual behavior and response schemas of these endpoints remain unverified. The specific functionality of the `/api/v1/transactions/295` endpoint is not documented beyond its title.","tags":[],"capabilities":["x402-payment","per-request-billing","usdc-base-network","no-api-key","post-endpoint","json-response"],"categories":["api-platform","finance","ai-ml","data","infrastructure"],"synonyms":["pay-per-call API","x402 API","USDC micropayment API","Base network API","lowpaymentfee","premium API access","crypto-paid API"],"warnings":["The specific functionality of /api/v1/transactions/295 is undocumented — 'Premium API Access' is the only description available.","All documentation pages (docs, pricing, README) returned only a 'Connect wallet' prompt with no substantive content.","No OpenAPI spec, request schema, or response schema is available for any endpoint.","The broader platform lists many endpoint categories (AI, analytics, finance, etc.) but none have verified documentation or response examples."],"endpointUrl":"https://lowpaymentfee.com/api/v1/transactions/295","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/295","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.350","qualityRationale":"The x402 challenge is live and well-formed, confirming the endpoint exists and accepts payment. However, there is no documentation, no OpenAPI schema, no example requests or responses, and the specific purpose of /api/v1/transactions/295 is entirely unclear beyond the generic title 'Premium API Access'. The docs, pricing, and README pages all returned only 'Connect wallet' with no 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'/request':13,30,183 '0.02':12,29,122,182 '000':111 '0x1a2b13e97f5f837c8f9fa1f95a1484b7c70d85f3':141 '0x833589fcd6edb6e08f4c7c32d4f71b54bda02913':117 '20':110 '300':144 '6':127 'Base network API' 'USDC micropayment API' 'accept':99 'access':97 'across':50 'actual':204 'address':140 'advertis':105,151 'ai/ml':53 'analysi':160 'analyt':52 'api':5,15,22,32,41,79,96 'asset':116 'base':8,25,71,112,119 'behavior':205 'beyond':224 'broad':46 'broader':149 'call':4,21 'categori':152 'challeng':104 'classif':163 'commit':85 'connect':195 'content':201 'convers':175 'cost':108 'crypto-paid API' 'data':51,56,156 'decim':128 'doc':189 'document':187,223 'embed':164 'enabl':40 'endpoint':49,61,89,211,220 'equal':121 'estim':172 'exact':135 'exchang':167 'export':157 'feed':166 'finance/web3':55 'function':216 'gas':171 'generat':177 'geocod':173 'howev':186 'includ':153 'infer':54 'infrastructur':58 'insight':158 'json-response' 'key':16,33,80 'limit':82 'list':93 'lowpaymentfee' 'lowpaymentfee.com':35 'made':131 'maximum':107 'metric':154 'network':9,26,72 'no-api-key' 'offer':44 'page':188 'paid':63 'pay':2,19 'pay-per-cal':1,18 'pay-per-call API' 'paye':139 'payment':129 'per':3,20,65,123 'per-request':64 'per-request-billing' 'platform':6,23,42,150 'point':185 'post':100 'post-endpoint' 'premium':95 'premium API access' 'price':165,184,190 'prompt':197 'protocol':76 'quot':170 'rate':81,168 'readm':191 'remain':212 'report':155 'request':66,101,124 'requir':17,34,86 'respons':207 'return':192 'schema':208 'scheme':136 'second':145 'sentiment':159 'set':47 'specif':88,215 'substant':200 'summar':162 'text':161 'timeout':146 'titl':226 'token':169 'unit':113 'unverifi':213 'upfront':84 'usdc':68,115,125 'usdc-base-network' 'use':67,126 'util':59 'valid':174 'via':10,27,73,132 'wallet':196 'window':147 'x402':11,28,39,75,103,134 'x402 API' 'x402-enabled':38 'x402-payment'","prices":[{"id":"1844ca40-255f-4aba-9173-16578fafeb2a","listingId":"07fff96f-8f6d-4881-8b60-a0c21fb7c2c6","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/295","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T19:25:47.124Z"}],"sources":[{"listingId":"07fff96f-8f6d-4881-8b60-a0c21fb7c2c6","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/transactions/295","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T19:25:47.124Z","lastSeenAt":"2026-04-23T14:31:35.078Z"}],"details":{"listingId":"07fff96f-8f6d-4881-8b60-a0c21fb7c2c6","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/transactions/295 \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402-payment-header>\"","exampleRequest":null,"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"The endpoint returns a 402 x402 challenge with maxAmountRequired of 20000 base units of USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/transactions/295"},{"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 & Machine Learning, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset address is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base","source_url":"https://lowpaymentfee.com/api/v1/transactions/295"}],"useCases":["Accessing premium API data without needing to register or manage API keys","Making one-off paid API calls from autonomous agents using x402 USDC payments","Integrating pay-as-you-go analytics, AI, or finance endpoints into workflows"],"bestFor":["Agents or developers who want zero-friction API access with crypto micropayments","Use cases requiring no-signup, no-rate-limit API consumption","x402-compatible clients on the Base network"],"notFor":["Users who need detailed API documentation or response schema guarantees before integrating","High-volume consumers who prefer subscription-based pricing over per-call payments","Users without access to USDC on the Base network"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:39.774Z"},"updatedAt":"2026-04-23T14:31:35.078Z"}}