{"id":"ddc42354-8b0c-4e6e-ae56-ed214bde51b1","shortId":"HsGKSt","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/11` 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 — you simply attach an x402 payment header to each request.\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\nDocumentation is extremely sparse. The /docs, /api, /pricing, and /README pages all render only a \"Connect wallet\" prompt with no further content. There is no OpenAPI spec, no request/response schema documentation, and no example payloads available. The actual functionality behind the `/api/v1/transactions/11` endpoint is unclear — the description says only \"Premium API Access\" without specifying what data or service it returns. The endpoint is live and responds with a valid x402 challenge via POST.","tags":[],"capabilities":["x402-payment","usdc-base-network","pay-per-request","no-api-key","post-method"],"categories":["infrastructure","finance"],"synonyms":["x402 API","micropayment API","USDC pay-per-call","Base network API","lowpaymentfee","crypto API gateway","402 payment protocol"],"warnings":["No documentation available — /docs, /api, /pricing, and /README all render only 'Connect wallet'","No OpenAPI or schema definition found for any endpoint","The specific functionality of /api/v1/transactions/11 is undocumented and unclear","Cannot verify what data or service is actually returned after payment"],"endpointUrl":"https://lowpaymentfee.com/api/v1/transactions/11","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/11","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 x402 402 challenge, but documentation is essentially nonexistent — all doc pages show only 'Connect wallet'. There is no OpenAPI spec, no request/response examples, and the purpose of this specific endpoint is unclear beyond the generic label 'Premium API 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'/api/v1/transactions/11':56,196 '/docs':160 '/pricing':162 '/readme':164 '/request':13,28,152 '0.02':12,27,78,151 '000':72 '20':71 '402':66 '402 payment protocol' 'Base network API' 'USDC pay-per-call' 'accept':46 'access':62,92,206 'across':108 'actual':192 'advertis':83 'ai':118 'analysi':122 'analyt':112 'api':5,20,38,61,85,205 'attach':95 'avail':190 'base':8,23,51,73 'behind':194 'broader':104 'call':4,19,80 'categori':110 'challeng':67,225 'classif':125 'connect':170 'content':176 'convers':142 'crypto API gateway' 'data':111,115,210 'descript':201 'document':155,185 'embed':126 'endpoint':55,107,145,197,216 'estim':136 'exampl':188 'exchang':131 'export':116 'extrem':157 'feed':130 'financ':127 'four':109 'function':193 'gas':135 'generat':143 'geocod':140 'header':99 'i.e':77 'infrastructur':138 'insight':117 'instant':91 'key':86 'learn':120 'limit':89 'list':58,147 'live':218 'lowpaymentfee' 'lowpaymentfee.com':31 'machin':119 'metric':113 'micropayment API' 'network':9,24,52 'no-api-key' 'offer':106 'openapi':180 'page':165 'pay':2,17,35 'pay-per-cal':1,16 'pay-per-request':34 'payload':189 'payment':48,98 'per':3,18,36,79 'platform':6,21,39,82,105 'point':154 'post':227 'post-method' 'premium':60,204 'price':129,153 'prompt':172 'protocol':44 'quot':134 'rate':88,132 'render':167 'report':114 'request':37,68,102 'request/response':183 'respond':220 'return':64,214 'say':202 'schema':184 'sentiment':121 'servic':212 'simpli':94 'spars':158 'spec':181 'specif':54 'specifi':208 'summar':124 'text':123 'token':133 'unclear':199 'unit':74 'usdc':15,30,47,76 'usdc-base-network' 'use':41 'util':139 'valid':141,223 'via':10,25,226 'wallet':171 'web3':128 'without':207 'x402':11,26,43,97,224 'x402 API' 'x402-payment'","prices":[{"id":"c7f465ba-ef89-4a68-8bd8-f8b8c8fdaaeb","listingId":"ddc42354-8b0c-4e6e-ae56-ed214bde51b1","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/11","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:58:15.545Z"}],"sources":[{"listingId":"ddc42354-8b0c-4e6e-ae56-ed214bde51b1","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/transactions/11","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:58:15.545Z","lastSeenAt":"2026-04-25T03:03:30.086Z"}],"details":{"listingId":"ddc42354-8b0c-4e6e-ae56-ed214bde51b1","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/transactions/11 \\\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 requesting up to 20,000 base units of USDC ($0.02) on Base network","source_url":"https://lowpaymentfee.com/api/v1/transactions/11"},{"claim":"The platform lists endpoints across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories, all at $0.02/request","source_url":"https://lowpaymentfee.com"},{"claim":"The platform advertises no API keys, no rate limits, instant access, and Base network settlement","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset address 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base network","source_url":"https://lowpaymentfee.com/api/v1/transactions/11"}],"useCases":["Accessing pay-per-call API services without subscription or API key management","Making micro-transactions for data or utility endpoints using USDC on Base","Integrating agent-driven workflows that pay per request via x402 protocol"],"bestFor":["Developers wanting zero-commitment, pay-as-you-go API access","AI agents that can autonomously pay for API calls via x402","Users who prefer crypto-native payment rails over traditional billing"],"notFor":["Users needing well-documented APIs with clear request/response schemas","High-volume use cases where per-request pricing may add up versus flat-rate plans","Anyone requiring non-crypto payment methods"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:44.501Z"},"updatedAt":"2026-04-25T03:03:30.086Z"}}