{"id":"c462727a-5eea-4e41-88a3-151dbbf43d6b","shortId":"NBYLFS","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 spanning data & analytics, AI & machine learning, finance & Web3, and infrastructure utilities. All endpoints are paid per-request using USDC on the Base network, with no API keys, no rate limits, and no minimum commitments required.\n\nThe specific endpoint at `/api/v1/accounts/138` is listed as \"Premium API Access\" and returns a 402 challenge requesting up to 20,000 base units of USDC (0x8335…2913 on Base). Since USDC uses 6 decimals, this translates to $0.02 per request, consistent with the site's advertised flat pricing. Payment is made via the x402 exact scheme, settling to the specified wallet address 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/request price point. However, documentation beyond the landing page is essentially empty (all sub-pages just show \"Connect wallet\"), so the actual request/response schemas for individual endpoints are unknown. Without documentation or OpenAPI specs, it is unclear what inputs each endpoint expects or what shape the responses take.","tags":[],"capabilities":["x402-payment","per-request-billing","usdc-base","no-api-key","no-rate-limits","data-analytics","ai-inference","finance-data","web3-data","utility-services"],"categories":["api-platform","finance","llm","geo"],"synonyms":["low payment fee","x402 api","pay per call api","usdc api","base network api","micropayment api","crypto api access","402 payment api"],"warnings":["No OpenAPI or schema documentation available — all doc/pricing/README pages return only 'Connect wallet'","The specific purpose and expected input/output of /api/v1/accounts/138 is undocumented","No example requests or responses are available from the provider","The platform lists many endpoints but none have documented schemas"],"endpointUrl":"https://lowpaymentfee.com/api/v1/accounts/138","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/accounts/138","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 OpenAPI spec, no documentation beyond a landing page, no request/response schema, and all doc pages are empty stubs. The purpose of this specific /accounts/138 endpoint is unclear beyond the generic label 'Premium API 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'/request':13,28,178 '0.02':12,27,118,177 '000':101 '0x8335':106 '20':100 '2913':107 '300':145 '402':95 '402 payment api' '6':113 'access':91 'actual':200 'address':142 'advertis':126,151 'ai':48 'ai-inference' 'analysi':155 'analyt':47 'api':5,20,37,71,90 'base':8,23,67,102,109 'base network api' 'beyond':183 'broader':149 'call':4,19 'challeng':96 'classif':158 'commit':79 'connect':196 'consist':121 'convers':170 'crypto api access' 'data':46 'data-analytics' 'decim':114 'document':182,209 'embed':159 'empti':189 'enabl':36 'endpoint':44,57,83,152,205,219 'essenti':188 'estim':167 'exact':135 'exchang':162 'expect':220 'feed':161 'financ':51 'finance-data' 'flat':127 'gas':166 'generat':172 'geocod':168 'howev':181 'individu':204 'infrastructur':54 'input':217 'key':72 'land':185 'learn':50 'limit':75 'list':87 'low payment fee' 'lowpaymentfee.com':31 'machin':49 'made':131 'micropayment api' 'minimum':78 'network':9,24,68 'no-api-key' 'no-rate-limits' 'offer':40 'openapi':211 'page':186,193 'paid':59 'pay':2,17 'pay per call api' 'pay-per-cal':1,16 'payment':129 'per':3,18,61,119 'per-request':60 'per-request-billing' 'platform':6,21,38,150 'point':180 'premium':89 'price':128,160,179 'quot':165 'rate':74,163 'request':62,97,120 'request/response':201 'requir':80 'respons':225 'return':93 'schema':202 'scheme':136 'second':146 'sentiment':154 'settl':137 'shape':223 'show':195 'sinc':110 'site':124 'span':45 'spec':212 'specif':82 'specifi':140 'sub':192 'sub-pag':191 'summar':157 'take':226 'text':156 'timeout':147 'token':164 'translat':116 'unclear':215 'unit':103 'unknown':207 'usdc':15,30,64,105,111 'usdc api' 'usdc-base' 'use':63,112 'util':55 'utility-services' 'valid':169 'varieti':42 'via':10,25,132 'wallet':141,197 'web3':52 'web3-data' 'without':208 'x402':11,26,35,134 'x402 api' 'x402-enabled':34 'x402-payment'","prices":[{"id":"8aeceead-6cab-42d5-ae4b-dfd47e8b9a88","listingId":"c462727a-5eea-4e41-88a3-151dbbf43d6b","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/accounts/138","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:41:01.755Z"}],"sources":[{"listingId":"c462727a-5eea-4e41-88a3-151dbbf43d6b","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/accounts/138","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:41:01.755Z","lastSeenAt":"2026-04-23T12:30:56.713Z"}],"details":{"listingId":"c462727a-5eea-4e41-88a3-151dbbf43d6b","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/accounts/138 \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402-payment-header>\" \\\n  -d '{}'","exampleRequest":null,"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"All endpoints are 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/accounts/138 requests maxAmountRequired of 20000 base units of USDC (asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base","source_url":"https://lowpaymentfee.com/api/v1/accounts/138"},{"claim":"Platform offers endpoints across Data & Analytics, AI & Machine Learning, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"}],"useCases":["Accessing premium API data without needing API key registration or subscriptions","Making one-off AI inference calls (sentiment, summarization, classification) paid in USDC","Fetching real-time crypto quotes, gas estimates, or exchange rates on a per-call basis","Geocoding or data validation with instant pay-per-use billing","Agent-driven workflows that need low-friction, wallet-based API access"],"bestFor":["Developers or agents who want zero-signup, pay-as-you-go API access","Crypto-native applications that can settle payments in USDC on Base","Low-volume or bursty workloads where per-request pricing is more economical than subscriptions"],"notFor":["Users who need detailed API documentation or OpenAPI schemas before integrating","High-volume production workloads where $0.02/request adds up significantly","Users without a Base-compatible USDC wallet"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:34.376Z"},"updatedAt":"2026-04-23T12:30:56.713Z"}}