{"id":"e706f11d-5d7f-484c-a3dd-9f9775957b8d","shortId":"KD2FSc","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 priced at $0.02 per request, paid in USDC on the Base network with no API keys, no rate limits, and no commitments required. The x402 protocol handles payment inline: callers attach a payment header and the server fulfills the request upon verification.\n\nThe specific endpoint at `/api/v1/transactions/338` is listed as \"Premium API Access\" and accepts POST requests. Its x402 challenge advertises a maxAmountRequired of 20,000 base units of USDC (asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base), which equals $0.02 given USDC's 6 decimals. Payment is sent to address 0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3 with a 300-second timeout.\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 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 actual technical documentation, schemas, or example payloads. Without documentation it is unclear what request bodies these endpoints expect or what response formats they return.","tags":[],"capabilities":["x402-payment","usdc-base-network","pay-per-request","no-api-key","data-analytics","ai-inference","sentiment-analysis","text-summarization","classification","embeddings","finance-data","geocoding","utility-services"],"categories":["api-platform","llm","finance","geo"],"synonyms":["low payment fee","x402 api","pay per call api","usdc api","base network api","micropayment api","402 payment api"],"warnings":["No API documentation available — docs, pricing, and README pages all show only 'Connect wallet'","No request or response schema provided for this endpoint or any other endpoint on the platform","The specific purpose of /api/v1/transactions/338 ('Premium API Access') is not explained anywhere","Cannot verify what data or functionality any of the advertised endpoints actually return"],"endpointUrl":"https://lowpaymentfee.com/api/v1/transactions/338","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/338","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 with clear pricing. However, there is no documentation, no OpenAPI schema, no request/response examples, and the docs/pricing/README pages are all blank beyond a wallet connect prompt. The purpose of this specific '/transactions/338' endpoint is unclear beyond the generic 'Premium API Access' 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'/request':13,28 '0.02':12,27,59,133,179 '000':122 '0x1a2b13e97f5f837c8f9fa1f95a1484b7c70d85f3':144 '0x833589fcd6edb6e08f4c7c32d4f71b54bda02913':128 '20':121 '300':147 '402 payment api' '6':137 'accept':111 'access':109 'across':45 'actual':203 'address':143 'advertis':117,153 'ai-inference' 'ai/ml':48 'analysi':157 'analyt':47 'api':5,20,37,71,108,189 'asset':127 'attach':87 'base':8,23,67,123,130 'base network api' 'bodi':217 'broader':151 'call':4,19 'caller':86 'challeng':116 'classif':160 'classification' 'commit':78 'connect':198 'convers':172 'data':46 'data-analytics' 'decim':138 'doc':188 'document':183,205,211 'embed':161 'embeddings' 'enabl':36 'endpoint':44,55,101,154,219 'equal':132 'estim':169 'exampl':208 'exchang':164 'expect':220 'extrem':185 'feed':163 'finance-data' 'finance/web3':50 'format':224 'fulfil':94 'gas':168 'generat':174 'geocod':170 'geocoding' 'given':134 'handl':83 'header':90 'howev':182 'infer':49 'infrastructur':52 'inlin':85 'key':72 'limit':75 'list':105 'low payment fee' 'lowpaymentfee.com':31 'maxamountrequir':119 'micropayment api' 'network':9,24,68 'no-api-key' 'offer':40 'page':193 'paid':62 'pay':2,17 'pay per call api' 'pay-per-cal':1,16 'pay-per-request' 'payload':209 'payment':84,89,139 'per':3,18,60 'platform':6,21,38,152 'point':181 'post':112 'premium':107 'price':57,162,180,190 'prompt':200 'protocol':82 'quot':167 'rate':74,165 'readm':192 'render':195 'request':61,96,113,216 'requir':79 'respons':223 'return':226 'schema':206 'second':148 'sent':141 'sentiment':156 'sentiment-analysis' 'server':93 'spars':186 'specif':100 'summar':159 'technic':204 'text':158 'text-summarization' 'timeout':149 'token':166 'unclear':214 'unit':124 'upon':97 'usdc':15,30,64,126,135 'usdc api' 'usdc-base-network' 'util':53 'utility-services' 'valid':171 'varieti':42 'verif':98 'via':10,25 'wallet':199 'without':210 'x402':11,26,35,81,115 'x402 api' 'x402-enabled':34 'x402-payment'","prices":[{"id":"dbe7a84b-3025-4d4a-b569-5c0d8f0260f2","listingId":"e706f11d-5d7f-484c-a3dd-9f9775957b8d","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/338","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T19:26:07.112Z"}],"sources":[{"listingId":"e706f11d-5d7f-484c-a3dd-9f9775957b8d","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/transactions/338","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T19:26:07.112Z","lastSeenAt":"2026-04-22T18:04:31.627Z"}],"details":{"listingId":"e706f11d-5d7f-484c-a3dd-9f9775957b8d","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/transactions/338 \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402-payment-token>\" \\\n  -d '{}'","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, instant access on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"x402 challenge returns maxAmountRequired of 20000 base units of USDC (0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base with 300s timeout","source_url":"https://lowpaymentfee.com/api/v1/transactions/338"},{"claim":"Platform offers endpoints across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"},{"claim":"Docs, API, pricing, and README pages render only 'Connect wallet' with no technical content","source_url":"https://lowpaymentfee.com/docs"}],"useCases":["Accessing AI inference endpoints (sentiment, summarization, classification, embeddings) without API key management","Fetching real-time financial data like token quotes, gas estimates, and exchange rates","Running utility operations like geocoding, validation, and data conversion on a per-call payment basis","Building agent workflows that pay per request using x402 on Base"],"bestFor":["Developers wanting zero-commitment, pay-as-you-go API access","AI agents that can settle payments via x402/USDC on Base","Projects needing quick access to multiple utility endpoints without signup"],"notFor":["Users who need detailed API documentation or guaranteed SLAs","High-volume consumers who would benefit from bulk pricing or subscriptions","Anyone without a Base-compatible USDC wallet"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:38.843Z"},"updatedAt":"2026-04-22T18:04:31.627Z"}}