{"id":"45f24887-a29b-4b06-9d87-5b1bc442d1a2","shortId":"VXt3H3","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/174` 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 uniformly priced at $0.02 per request.\n\nThis particular endpoint (`/api/v1/transactions/174`) is labeled \"Premium API Access\" but its actual functionality is unclear — the crawled documentation pages returned only \"Connect wallet\" placeholders with no detailed schema or response documentation. The endpoint accepts POST requests and returns application/json. Payment is settled in USDC on Base to address 0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3 with a 300-second timeout.","tags":[],"capabilities":["x402-payment","usdc-base-network","pay-per-request","no-api-key","json-response","post-method"],"categories":["api-platform","finance"],"synonyms":["x402 API","pay-per-call API","USDC micropayment API","Base network API","lowpaymentfee","premium API access","crypto-paid API"],"warnings":["Documentation pages (/docs, /api, /pricing, /README) all return only 'Connect wallet' with no actual content","The specific functionality of /api/v1/transactions/174 ('Premium API Access') is undocumented and unclear","No OpenAPI spec or request/response schema available","No example responses to verify what data this endpoint actually returns"],"endpointUrl":"https://lowpaymentfee.com/api/v1/transactions/174","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/174","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.350","qualityRationale":"The endpoint is live and returns a valid x402 402 challenge, confirming pricing and payment details. However, there is no OpenAPI schema, no documentation beyond placeholder pages, and the actual functionality of this specific endpoint (/api/v1/transactions/174) is entirely unclear. The description 'Premium API Access' is generic and uninformative. No request/response examples are 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'/request':13,28 '0.02':12,27,78,154 '000':72 '0x1a2b13e97f5f837c8f9fa1f95a1484b7c70d85f3':205 '20':71 '300':208 '402':66 'Base network API' 'USDC micropayment API' 'accept':46,190 'access':62,92,165 'across':112 'actual':168 'address':204 'advertis':83 'ai':122 'analysi':126 'analyt':116 'api':5,20,38,61,85,164 'application/json':195 'attach':95 'base':8,23,51,73,202 'broader':108 'call':4,19,80 'caller':93 'categori':114 'challeng':67 'classif':129 'connect':178 'convers':146 'crawl':173 'crypto-paid API' 'data':115,119 'detail':183 'document':174,187 'embed':130 'endpoint':55,111,149,159,189 'estim':140 'exchang':135 'export':120 'feed':134 'financ':131 'four':113 'function':169 'gas':139 'generat':147 'geocod':144 'header':100 'i.e':77 'infrastructur':142 'insight':121 'instant':91 'json-response' 'key':86 'label':162 'learn':124 'limit':89 'list':58 'lowpaymentfee' 'lowpaymentfee.com':31 'machin':123 'metric':117 'network':9,24,52 'no-api-key' 'offer':110 'page':175 'particular':158 'pay':2,17,35 'pay-per-cal':1,16 'pay-per-call API' 'pay-per-request':34 'payment':48,99,105,196 'per':3,18,36,79,155 'placehold':180 'platform':6,21,39,82,109 'post':191 'post-method' 'premium':60,163 'premium API access' 'price':133,152 'proof':106 'protocol':44 'quot':138 'rate':88,136 'report':118 'request':37,68,156,192 'respons':186 'return':64,176,194 'schema':184 'second':209 'sentiment':125 'settl':198 'simpli':94 'specif':54 'summar':128 'text':127 'timeout':210 'token':137 'unclear':171 'uniform':151 'unit':74 'usdc':15,30,47,76,200 'usdc-base-network' 'use':41 'util':143 'valid':103,145 'via':10,25 'wallet':179 'web3':132 'x':98 'x-payment':97 'x402':11,26,43,104 'x402 API' 'x402-payment'","prices":[{"id":"9fc88778-3fe7-492d-9dbd-d6510b795998","listingId":"45f24887-a29b-4b06-9d87-5b1bc442d1a2","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/174","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:58:49.151Z"}],"sources":[{"listingId":"45f24887-a29b-4b06-9d87-5b1bc442d1a2","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/transactions/174","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:58:49.151Z","lastSeenAt":"2026-04-23T20:33:06.650Z"}],"details":{"listingId":"45f24887-a29b-4b06-9d87-5b1bc442d1a2","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/transactions/174 \\\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/174"},{"claim":"The platform advertises $0.02/request pricing with no API keys, no rate limits, and instant access","source_url":"https://lowpaymentfee.com"},{"claim":"Payment is made in USDC (asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) to address 0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3","source_url":"https://lowpaymentfee.com/api/v1/transactions/174"},{"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 directly in USDC on Base","Integrating pay-per-use endpoints into agent workflows via x402"],"bestFor":["Developers who want instant API access without signup or API keys","AI agents that can settle x402 payments autonomously","Users who prefer crypto micropayments over subscription billing"],"notFor":["Users needing detailed API documentation or guaranteed SLAs","High-volume consumers who would benefit from bulk pricing or subscriptions"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:42.992Z"},"updatedAt":"2026-04-23T20:33:06.650Z"}}