{"id":"196d28ec-b1f6-4e5d-9a08-b48e7acc6c7f","shortId":"Mp6szy","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 set of endpoints spanning data analytics, AI/ML inference, finance/Web3 data, and utility services. All endpoints are paid per-request using USDC on the Base network at a flat rate of $0.02 per call. No API keys, rate limits, or upfront commitments are required — callers simply attach an x402 payment header to each request.\n\nThe specific endpoint at `/api/v1/transactions/24` 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 given USDC's 6 decimals. The endpoint accepts POST requests and returns `application/json`. The broader platform advertises additional categories including sentiment analysis, text summarization, classification, embeddings, price feeds, exchange rates, gas estimates, geocoding, validation, conversion, and generation — all at the same $0.02 price point.\n\nDocumentation is extremely sparse. The /docs, /pricing, /api, 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 usage examples available from the crawled pages. The actual functionality behind each endpoint cannot be verified from the available material.","tags":[],"capabilities":["x402-payment","per-request-billing","usdc-base-network","json-api","post-method","no-api-key","data-analytics","ai-inference","finance-data","web3-data","utility-services"],"categories":["api-platform","finance","llm","geo"],"synonyms":["pay-per-call API","x402 API","USDC micropayment API","Base network API","low fee API","crypto-paid API","metered API"],"warnings":["No documentation available — /docs, /pricing, /api, and /README all render only 'Connect wallet'","No OpenAPI or schema definition found for any endpoint","The specific purpose of /api/v1/transactions/24 ('Premium API Access') is not explained anywhere","Cannot verify what data or functionality any endpoint actually returns"],"endpointUrl":"https://lowpaymentfee.com/api/v1/transactions/24","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/24","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 network. However, documentation is essentially nonexistent — all doc pages show only 'Connect wallet'. There is no OpenAPI spec, no request/response schema, and no examples. The actual functionality behind 'Premium API Access' at /api/v1/transactions/24 is 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'/api/v1/transactions/24':101 '/docs':178 '/pricing':179 '/readme':182 '/request':13,28 '0.02':12,27,74,128,170 '000':117 '0x8335':122 '20':116 '2913':123 '402':111 '6':132 'Base network API' 'USDC micropayment API' 'accept':136 'access':107 'actual':214 'addit':146 'advertis':145 'ai-inference' 'ai/ml':49 'analysi':150 'analyt':48 'api':5,20,37,78,106 'application/json':141 'attach':89 'avail':208,224 'base':8,23,67,118,125 'behind':216 'broad':42 'broader':143 'call':4,19,76 'caller':87 'cannot':219 'categori':147 'challeng':112 'classif':153 'commit':84 'connect':188 'content':194 'convers':163 'crawl':211 'crypto-paid API' 'data':47,52 'data-analytics' 'decim':133 'document':173,203 'embed':154 'enabl':36 'endpoint':45,57,99,135,218 'equal':127 'estim':160 'exampl':207 'exchang':157 'extrem':175 'feed':156 'finance-data' 'finance/web3':51 'flat':71 'function':215 'gas':159 'generat':165 'geocod':161 'given':129 'header':93 'includ':148 'infer':50 'json-api' 'key':79 'limit':81 'list':103 'low fee API' 'lowpaymentfee.com':31 'materi':225 'metered API' 'network':9,24,68 'no-api-key' 'offer':40 'openapi':198 'page':183,212 'paid':59 'pay':2,17 'pay-per-cal':1,16 'pay-per-call API' 'payment':92 'per':3,18,61,75 'per-request':60 'per-request-billing' 'platform':6,21,38,144 'point':172 'post':137 'post-method' 'premium':105 'price':155,171 'prompt':190 'rate':72,80,158 'render':185 'request':62,96,113,138 'request/response':201 'requir':86 'return':109,140 'schema':202 'sentiment':149 'servic':55 'set':43 'simpli':88 'span':46 'spars':176 'spec':199 'specif':98 'summar':152 'text':151 'unit':119 'upfront':83 'usag':206 'usdc':15,30,64,121,130 'usdc-base-network' 'use':63 'util':54 'utility-services' 'valid':162 'verifi':221 'via':10,25 'wallet':189 'web3-data' 'x402':11,26,35,91 'x402 API' 'x402-enabled':34 'x402-payment'","prices":[{"id":"f2df4f2b-ab89-425b-aa98-6362b38de897","listingId":"196d28ec-b1f6-4e5d-9a08-b48e7acc6c7f","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/24","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:59:30.035Z"}],"sources":[{"listingId":"196d28ec-b1f6-4e5d-9a08-b48e7acc6c7f","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/transactions/24","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:59:30.035Z","lastSeenAt":"2026-04-22T19:32:15.841Z"}],"details":{"listingId":"196d28ec-b1f6-4e5d-9a08-b48e7acc6c7f","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/transactions/24 \\\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":"Flat pricing of $0.02 per request with no API keys, rate limits, or commitments","source_url":"https://lowpaymentfee.com"},{"claim":"Endpoint returns 402 challenge requesting maxAmountRequired of 20000 base units of USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/transactions/24"},{"claim":"USDC asset address 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base network","source_url":"https://lowpaymentfee.com/api/v1/transactions/24"},{"claim":"Platform advertises endpoints across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"}],"useCases":["Agents that need on-demand API access without managing API keys or subscriptions","Programmatic access to analytics, AI inference, or financial data with per-call USDC payments","Web3-native applications that want to consume utility APIs settled on Base"],"bestFor":["Developers wanting zero-commitment, pay-as-you-go API access","AI agents with x402-compatible payment capabilities on Base","Projects needing low-cost per-request pricing without rate limits"],"notFor":["Users who need detailed API documentation or guaranteed SLAs before integrating","High-volume consumers who would benefit from bulk/subscription pricing","Callers without access to USDC on the Base network"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:41.042Z"},"updatedAt":"2026-04-22T19:32:15.841Z"}}