{"id":"edc58a00-d4cd-464b-9276-63d820efbafc","shortId":"jvejyE","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 an x402-enabled API platform that offers a broad catalog of endpoints spanning data analytics, AI/ML inference, finance/Web3 data, and infrastructure utilities. All endpoints are paid per-request using USDC on the Base network, with no API keys, no rate limits, and no commitments required. The specific endpoint at `/api/v1/transactions/223` is listed as \"Premium API Access\" and returns a 402 challenge requesting up to 20,000 base units of USDC (0x8335…2913 on Base), which equals $0.02 per call (USDC uses 6 decimals).\n\nThe platform advertises a uniform $0.02/request pricing across all its endpoints. Categories include 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 (geocoding, validation, conversion, generation). The x402 challenge confirms the endpoint is live and accepts POST requests with JSON responses.\n\nDocumentation is extremely sparse — the /docs, /api, /pricing, and /README pages all render only a \"Connect wallet\" prompt with no further technical detail. There is no OpenAPI spec, no request/response schema documentation, and no example payloads available. The actual behavior and data returned by this specific transactions endpoint is unknown beyond the generic \"Premium API Access\" label.","tags":[],"capabilities":["x402-payment","usdc-base-network","pay-per-request","no-api-key","json-response","post-method"],"categories":["api-platform","finance"],"synonyms":["low payment fee","x402 api","pay per call api","usdc api","base network api","micropayment api","402 payment api"],"warnings":["No OpenAPI or schema documentation available — endpoint behavior is unknown beyond the generic 'Premium API Access' label","All documentation pages (/docs, /api, /pricing, /README) render only 'Connect wallet' with no technical content","The specific purpose and expected input/output of /api/v1/transactions/223 is undocumented","No request body schema or response schema provided anywhere"],"endpointUrl":"https://lowpaymentfee.com/api/v1/transactions/223","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/223","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 pricing is clear ($0.02 USDC on Base), but there is no OpenAPI spec, no request/response schema, no documentation beyond a landing page listing, and no examples. The actual purpose of the /transactions/223 endpoint is opaque. This is effectively a stub 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'/api/v1/transactions/223':84 '/docs':184 '/pricing':186 '/readme':188 '/request':13,28,124 '0.02':12,27,111,123 '000':100 '0x8335':105 '20':99 '2913':106 '402':94 '402 payment api' '6':116 'accept':173 'access':90,234 'across':126 'actual':217 'advertis':120 'ai':139 'ai/ml':49 'analysi':143 'analyt':48,133 'api':5,20,37,71,89,233 'avail':215 'base':8,23,67,101,108 'base network api' 'behavior':218 'beyond':229 'broad':42 'call':4,19,113 'catalog':43 'categori':130 'challeng':95,166 'classif':146 'commit':78 'confirm':167 'connect':194 'convers':162 'data':47,52,132,136,220 'decim':117 'detail':201 'document':179,210 'embed':147 'enabl':36 'endpoint':45,57,82,129,169,226 'equal':110 'estim':157 'exampl':213 'exchang':152 'export':137 'extrem':181 'feed':151 'financ':148 'finance/web3':51 'gas':156 'generat':163 'generic':231 'geocod':160 'includ':131 'infer':50 'infrastructur':54,159 'insight':138 'json':177 'json-response' 'key':72 'label':235 'learn':141 'limit':75 'list':86 'live':171 'low payment fee' 'lowpaymentfee.com':31 'machin':140 'metric':134 'micropayment api' 'network':9,24,68 'no-api-key' 'offer':40 'openapi':205 'page':189 'paid':59 'pay':2,17 'pay per call api' 'pay-per-cal':1,16 'pay-per-request' 'payload':214 'per':3,18,61,112 'per-request':60 'platform':6,21,38,119 'post':174 'post-method' 'premium':88,232 'price':125,150 'prompt':196 'quot':155 'rate':74,153 'render':191 'report':135 'request':62,96,175 'request/response':208 'requir':79 'respons':178 'return':92,221 'schema':209 'sentiment':142 'span':46 'spars':182 'spec':206 'specif':81,224 'summar':145 'technic':200 'text':144 'token':154 'transact':225 'uniform':122 'unit':102 'unknown':228 'usdc':15,30,64,104,114 'usdc api' 'usdc-base-network' 'use':63,115 'util':55 'valid':161 'via':10,25 'wallet':195 'web3':149 'x402':11,26,35,165 'x402 api' 'x402-enabled':34 'x402-payment'","prices":[{"id":"f358d254-f396-4b1e-8018-7b61e36083da","listingId":"edc58a00-d4cd-464b-9276-63d820efbafc","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/223","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:59:15.660Z"}],"sources":[{"listingId":"edc58a00-d4cd-464b-9276-63d820efbafc","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/transactions/223","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:59:15.660Z","lastSeenAt":"2026-04-23T17:32:15.908Z"}],"details":{"listingId":"edc58a00-d4cd-464b-9276-63d820efbafc","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/transactions/223 \\\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":"Uniform $0.02/request pricing with no API keys, no rate limits, instant access on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"x402 challenge returns maxAmountRequired of 20000 base units of USDC (asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base","source_url":"https://lowpaymentfee.com/api/v1/transactions/223"},{"claim":"Platform offers endpoints across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"}],"useCases":["Programmatic access to API services with per-call USDC micropayments","Agent-driven workflows that need keyless, pay-as-you-go API access","Accessing transaction data or premium content behind an x402 paywall"],"bestFor":["Developers wanting zero-commitment, pay-per-use API access","AI agents with x402-compatible wallets on Base","Users who prefer crypto micropayments over subscription billing"],"notFor":["Users needing detailed API documentation or OpenAPI specs before integrating","High-volume use cases where per-call pricing may add up compared to flat-rate plans","Anyone without a Base-network USDC wallet"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:41.698Z"},"updatedAt":"2026-04-23T17:32:15.908Z"}}