{"id":"fb086163-bb71-4aab-a2ea-3ffaca2ada84","shortId":"n57bPD","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 endpoints spanning data analytics, AI/ML inference, finance/Web3 data, and infrastructure utilities. Every endpoint costs $0.02 per request, paid in USDC on the Base network with no API keys, no rate limits, and no upfront commitments. The x402 protocol handles payment inline: callers attach a payment header to each HTTP request and receive the response immediately upon settlement.\n\nThe specific endpoint at `/api/v1/transactions/236` is listed as \"Premium API Access\" and returns an x402 challenge requesting up to 20,000 base units of USDC (0x8335…2913 on Base). Since USDC uses 6 decimals, this equals $0.02 per call — consistent with the site's advertised flat pricing. 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 beyond the landing page is essentially empty (all doc/pricing/API pages just show \"Connect wallet\"), so the actual request/response schemas for this and other endpoints are unknown.","tags":[],"capabilities":["x402-payment","usdc-base-network","pay-per-request","json-api","post-method","no-api-key","no-rate-limit"],"categories":["api-platform","infrastructure"],"synonyms":["lowpaymentfee","low payment fee API","x402 API","micropayment API","pay-per-call API","USDC API","Base network API"],"warnings":["No documentation available — all doc/pricing/API pages are empty beyond 'Connect wallet'","No OpenAPI or request/response schema provided for any endpoint","The specific purpose of /api/v1/transactions/236 ('Premium API Access') is unclear — it does not match any of the named endpoints on the landing page","Cannot verify what data or functionality this endpoint actually returns"],"endpointUrl":"https://lowpaymentfee.com/api/v1/transactions/236","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/236","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, but there is no documentation, no OpenAPI schema, no request/response examples, and the purpose of this specific 'transactions/236' endpoint is entirely opaque. All doc pages return only 'Connect wallet' with no 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'/request':13,28 '0.02':12,27,59,138,187 '000':122 '0x8335':127 '20':121 '2913':128 '6':134 'Base network API' 'USDC API' 'accept':151 'access':112 'actual':208 'advertis':146,160 'ai/ml':49 'analysi':164 'analyt':48 'api':5,20,37,71,111 'application/json':156 'attach':87 'base':8,23,67,123,130 'beyond':192 'broad':42 'broader':158 'call':4,19,140 'caller':86 'catalog':43 'challeng':117 'classif':167 'commit':79 'connect':204 'consist':141 'convers':179 'cost':58 'data':47,52,181 'decim':135 'doc/pricing/api':200 'document':191 'embed':168 'empti':198 'enabl':36 'endpoint':45,57,104,150,161,215 'equal':137 'essenti':197 'estim':176 'everi':56 'exchang':171 'feed':170 'finance/web3':51 'flat':147 'gas':175 'generat':182 'geocod':177 'handl':83 'header':90 'howev':190 'http':93 'immedi':99 'infer':50 'infrastructur':54 'inlin':85 'json-api' 'key':72 'land':194 'limit':75 'list':108 'low payment fee API' 'lowpaymentfee' 'lowpaymentfee.com':31 'micropayment API' 'network':9,24,68 'no-api-key' 'no-rate-limit' 'offer':40 'page':195,201 'paid':62 'pay':2,17 'pay-per-cal':1,16 'pay-per-call API' 'pay-per-request' 'payment':84,89 'per':3,18,60,139 'platform':6,21,38,159 'point':189 'post':152 'post-method' 'premium':110 'price':148,169,188 'protocol':82 'quot':174 'rate':74,172 'receiv':96 'request':61,94,118,153 'request/response':209 'respons':98 'return':114,155 'schema':210 'sentiment':163 'settlement':101 'show':203 'sinc':131 'site':144 'span':46 'specif':103 'summar':166 'text':165 'token':173 'unit':124 'unknown':217 'upfront':78 'upon':100 'usdc':15,30,64,126,132 'usdc-base-network' 'use':133 'util':55 'valid':178 'via':10,25 'wallet':205 'x402':11,26,35,81,116 'x402 API' 'x402-enabled':34 'x402-payment'","prices":[{"id":"0a3341c9-6ddf-414d-8175-3d287ca6ee81","listingId":"fb086163-bb71-4aab-a2ea-3ffaca2ada84","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/236","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:59:25.252Z"}],"sources":[{"listingId":"fb086163-bb71-4aab-a2ea-3ffaca2ada84","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/transactions/236","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:59:25.252Z","lastSeenAt":"2026-04-23T17:32:16.344Z"}],"details":{"listingId":"fb086163-bb71-4aab-a2ea-3ffaca2ada84","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/transactions/236 \\\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 cost $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 this endpoint requests maxAmountRequired of 20000 base units of USDC (asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base","source_url":"https://lowpaymentfee.com/api/v1/transactions/236"},{"claim":"The platform lists endpoints for analytics, AI/ML, finance/Web3, and infrastructure utilities","source_url":"https://lowpaymentfee.com"}],"useCases":["Accessing premium API data with per-request USDC micropayments","Agent-driven workflows that need keyless, on-demand API access","Prototyping integrations without subscription commitments"],"bestFor":["Developers who want zero-signup, pay-as-you-go API access","AI agents with Base USDC wallets needing inline payment endpoints","Users exploring x402 protocol-based commerce"],"notFor":["Users who need detailed API documentation or OpenAPI schemas before integrating","High-volume consumers who would benefit from bulk/subscription pricing","Anyone without a Base-compatible USDC wallet"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:41.279Z"},"updatedAt":"2026-04-23T17:32:16.344Z"}}