{"id":"aaa25bc2-742a-47c5-8519-a2b26b123c9d","shortId":"MYTjta","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 pay-per-request endpoints across four categories: Data & Analytics, AI & Machine Learning, Finance & Web3, and Infrastructure. Each call costs $0.02 in USDC on the Base network, settled on-chain with no API keys, no rate limits, and no upfront commitments.\n\nThe specific endpoint at `/api/v1/payments/130` is listed as \"Premium API Access.\" The x402 challenge confirms it is live, accepting POST requests and requiring payment of up to 20,000 base units of USDC (0x8335…) on Base, which equals $0.02 (USDC uses 6 decimals). Payment is made via the x402 exact scheme 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 data generation — all at the same $0.02 per request price point. However, documentation beyond the landing page is extremely sparse: the /docs, /api, /pricing, and /README pages all render only a \"Connect wallet\" prompt with no further technical detail, schemas, or example payloads. Without request/response schemas or usage examples, integrating with any specific endpoint requires experimentation or additional out-of-band information.","tags":[],"capabilities":["x402-payment","usdc-base","pay-per-request","data-analytics","ai-inference","sentiment-analysis","text-summarization","classification","embeddings","finance-data","crypto-quotes","gas-estimates","geocoding","validation","conversion"],"categories":["api-platform","llm","finance","geo"],"synonyms":["low payment fee","x402 api","pay per call api","usdc api","base network api","micropayment api","lowpaymentfee"],"warnings":["Documentation pages (/docs, /api, /pricing, /README) are all empty beyond a 'Connect wallet' prompt — no technical docs available.","No request or response schema is provided for any endpoint; integration requires guesswork.","The specific purpose of /api/v1/payments/130 ('Premium API Access') is not explained and does not match any of the named endpoints on the landing page.","The breadth of advertised capabilities (AI, finance, geo, etc.) cannot be verified from available material."],"endpointUrl":"https://lowpaymentfee.com/api/v1/payments/130","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/payments/130","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 challenge with clear pricing. However, documentation is essentially nonexistent — all doc/pricing/readme pages show only 'Connect wallet.' There are no request/response schemas, no examples, and the purpose of the specific '/api/v1/payments/130' endpoint is unclear beyond the generic label 'Premium API 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'/api/v1/payments/130':91 '/docs':188 '/pricing':190 '/readme':192 '/request':13,28 '0.02':12,27,65,125,173 '000':115 '0x8335':120 '20':114 '300':140 '6':128 'accept':105 'access':97 'across':50 'addit':224 'advertis':146 'ai':55 'ai-inference' 'analysi':150 'analyt':54 'api':5,20,37,78,96 'band':228 'base':8,23,70,116,122 'base network api' 'beyond':180 'broad':42 'broader':144 'call':4,19,63 'catalog':43 'categori':52 'chain':75 'challeng':100 'classif':153 'classification' 'commit':86 'confirm':101 'connect':198 'convers':165 'conversion' 'cost':64 'crypto-quotes' 'data':53,167 'data-analytics' 'decim':129 'detail':205 'document':179 'embed':154 'embeddings' 'enabl':36 'endpoint':49,89,147,220 'equal':124 'estim':162 'exact':136 'exampl':208,215 'exchang':157 'experiment':222 'extrem':185 'feed':156 'financ':58 'finance-data' 'four':51 'gas':161 'gas-estimates' 'generat':168 'geocod':163 'geocoding' 'howev':178 'inform':229 'infrastructur':61 'integr':216 'key':79 'land':182 'learn':57 'limit':82 'list':93 'live':104 'low payment fee' 'lowpaymentfee' 'lowpaymentfee.com':31 'machin':56 'made':132 'micropayment api' 'network':9,24,71 'offer':40 'on-chain':73 'out-of-band':225 'page':183,193 'pay':2,17,46 'pay per call api' 'pay-per-cal':1,16 'pay-per-request':45 'payload':209 'payment':110,130 'per':3,18,47,174 'platform':6,21,38,145 'point':177 'post':106 'premium':95 'price':155,176 'prompt':200 'quot':160 'rate':81,158 'render':195 'request':48,107,175 'request/response':211 'requir':109,221 'schema':206,212 'scheme':137 'second':141 'sentiment':149 'sentiment-analysis' 'settl':72 'spars':186 'specif':88,219 'summar':152 'technic':204 'text':151 'text-summarization' 'timeout':142 'token':159 'unit':117 'upfront':85 'usag':214 'usdc':15,30,67,119,126 'usdc api' 'usdc-base' 'use':127 'valid':164 'validation' 'via':10,25,133 'wallet':199 'web3':59 'without':210 'x402':11,26,35,99,135 'x402 api' 'x402-enabled':34 'x402-payment'","prices":[{"id":"b387c48c-a911-403a-bb3f-da5ffc896139","listingId":"aaa25bc2-742a-47c5-8519-a2b26b123c9d","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/payments/130","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:49:27.531Z"}],"sources":[{"listingId":"aaa25bc2-742a-47c5-8519-a2b26b123c9d","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/payments/130","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:49:27.531Z","lastSeenAt":"2026-04-23T05:01:21.741Z"}],"details":{"listingId":"aaa25bc2-742a-47c5-8519-a2b26b123c9d","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/payments/130 \\\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":"The platform advertises $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 shows maxAmountRequired of 20000 base units of USDC (asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base, equaling $0.02.","source_url":"https://lowpaymentfee.com/api/v1/payments/130"},{"claim":"Documentation pages /docs, /api, /pricing, /README render only 'Connect wallet' with no further content.","source_url":"https://lowpaymentfee.com/docs"}],"useCases":["Agents needing on-demand AI inference (sentiment, summarization, classification, embeddings) without API key management","Fetching real-time crypto token quotes and gas estimates via a single micropayment","Geocoding or data validation calls where per-request billing is preferable to a subscription"],"bestFor":["AI agents that can settle x402 payments in USDC on Base","Developers wanting zero-commitment, pay-as-you-go API access","Use cases requiring small, infrequent API calls where subscriptions are wasteful"],"notFor":["High-volume production workloads needing guaranteed SLAs and detailed documentation","Users who cannot transact in USDC on the Base network"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:09.881Z"},"updatedAt":"2026-04-23T05:01:21.741Z"}}