{"id":"0fc51eb6-b4cd-4841-adbc-e9f61b3f5634","shortId":"SEpSPE","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 variety of endpoints across data analytics, AI/ML inference, finance/Web3, and infrastructure utilities. All endpoints are pay-per-request at $0.02 each, settled in USDC on the Base network. No API keys, accounts, or rate limits are required — callers simply attach an x402 payment header to each request.\n\nThe specific endpoint at `/api/v1/transactions/216` 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 payment scheme is \"exact\" with a 300-second timeout. The endpoint accepts POST requests and returns application/json.\n\nThe broader platform advertises endpoints for sentiment analysis, text summarization, classification, embeddings, price feeds, exchange rates, token quotes, gas estimates, geocoding, validation, conversion, and data generation — all at the same $0.02 price point. However, documentation 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 usage examples available from the crawled content. The actual functionality behind this specific `/transactions/216` endpoint is unclear beyond its generic \"Premium API Access\" label.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","pay-per-request","no-api-key","json-response","post-method"],"categories":["infrastructure","api-marketplace"],"synonyms":["low payment fee","x402 api","micropayment api","pay per call api","usdc api","base network api","402 payment api"],"warnings":["No OpenAPI or schema documentation available — the /docs, /pricing, /api, and /README pages all show only 'Connect wallet' with no content.","The actual functionality behind /api/v1/transactions/216 ('Premium API Access') is not described anywhere in the crawled material.","The broader platform lists many endpoint categories (AI, finance, analytics, etc.) but none have documented request/response formats.","Cannot verify what data or service this specific endpoint actually provides."],"endpointUrl":"https://lowpaymentfee.com/api/v1/transactions/216","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/216","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, confirming pricing and payment details. However, there is no OpenAPI spec, no request/response schema, no documentation beyond a wallet-connect prompt, and the actual functionality of this specific endpoint ('Premium API Access' at /transactions/216) is entirely undocumented. The listing is effectively a 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'/api/v1/transactions/216':94 '/docs':184 '/pricing':186 '/readme':188 '/request':13,28 '/transactions/216':226 '0.02':12,27,62,121,175 '000':110 '0x8335':115 '20':109 '2913':116 '300':134 '402':104 '402 payment api' '6':125 'accept':139 'access':100,235 'account':74 'across':45 'actual':221 'advertis':148 'ai/ml':48 'analysi':152 'analyt':47 'api':5,20,37,72,99,234 'application/json':144 'attach':82 'avail':215 'base':8,23,69,111,118 'base network api' 'base-network' 'behind':223 'beyond':230 'broader':146 'call':4,19 'caller':80 'challeng':105 'classif':155 'connect':194 'content':219 'convers':167 'crawl':218 'data':46,169 'decim':126 'detail':201 'document':179,210 'embed':156 'enabl':36 'endpoint':44,55,92,138,149,227 'equal':120 'estim':164 'exact':131 'exampl':214 'exchang':159 'extrem':181 'feed':158 'finance/web3':50 'function':222 'gas':163 'generat':170 'generic':232 'geocod':165 'given':122 'header':86 'howev':178 'infer':49 'infrastructur':52 'json-response' 'key':73 'label':236 'limit':77 'list':96 'low payment fee' 'lowpaymentfee.com':31 'micropayment api' 'network':9,24,70 'no-api-key' 'offer':40 'openapi':205 'page':189 'pay':2,17,58 'pay per call api' 'pay-per-cal':1,16 'pay-per-request':57 'payment':85,128 'per':3,18,59 'platform':6,21,38,147 'point':177 'post':140 'post-method' 'premium':98,233 'price':157,176 'prompt':196 'quot':162 'rate':76,160 'render':191 'request':60,89,106,141 'request/response':208 'requir':79 'return':102,143 'schema':209 'scheme':129 'second':135 'sentiment':151 'settl':64 'simpli':81 'spars':182 'spec':206 'specif':91,225 'summar':154 'technic':200 'text':153 'timeout':136 'token':161 'unclear':229 'unit':112 'usag':213 'usdc':15,30,66,114,123 'usdc api' 'usdc-settlement' 'util':53 'valid':166 'varieti':42 'via':10,25 'wallet':195 'x402':11,26,35,84 'x402 api' 'x402-enabled':34 'x402-payment'","prices":[{"id":"80040d09-62b1-4bdb-b608-012a499e3d37","listingId":"0fc51eb6-b4cd-4841-adbc-e9f61b3f5634","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/216","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:59:12.657Z"}],"sources":[{"listingId":"0fc51eb6-b4cd-4841-adbc-e9f61b3f5634","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/transactions/216","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:59:12.657Z","lastSeenAt":"2026-04-22T17:02:13.883Z"}],"details":{"listingId":"0fc51eb6-b4cd-4841-adbc-e9f61b3f5634","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/transactions/216 \\\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":"All endpoints priced at $0.02 per request with no API keys, no rate limits, and instant access on Base network.","source_url":"https://lowpaymentfee.com"},{"claim":"The x402 challenge for /api/v1/transactions/216 requests maxAmountRequired of 20000 base units of USDC (asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base.","source_url":"https://lowpaymentfee.com/api/v1/transactions/216"},{"claim":"Platform offers endpoints across Data & Analytics, AI & Machine Learning, Finance & Web3, and Infrastructure categories.","source_url":"https://lowpaymentfee.com"},{"claim":"Documentation pages (/docs, /api, /pricing, /README) render only a 'Connect wallet' prompt with no technical content.","source_url":"https://lowpaymentfee.com/docs"}],"useCases":["Accessing pay-per-call API services without needing API keys or subscriptions","Making micropayment-gated API calls settled on Base L2 in USDC","Agent-driven workflows that need on-demand API access with crypto payment"],"bestFor":["Developers wanting zero-commitment, pay-as-you-go API access","AI agents that can handle x402 payment flows autonomously","Users who prefer crypto-native micropayments over traditional billing"],"notFor":["Users needing detailed API documentation or OpenAPI specs before integrating","High-volume use cases where per-request pricing may be less economical than bulk plans","Developers who cannot transact in USDC on the Base network"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:41.848Z"},"updatedAt":"2026-04-22T17:02:13.883Z"}}