{"id":"9839f4a7-56ab-4821-bc35-9897c4dea553","shortId":"sY6KSg","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 a pay-per-request API platform that uses the x402 protocol to accept USDC payments on the Base network. The specific endpoint at `/api/v1/payments/334` is listed as \"Premium API Access\" and returns a 402 challenge requesting up to 20,000 base units of USDC (i.e., $0.02) per call. The platform advertises no API keys, no rate limits, and instant access — you simply attach an x402 payment header to each request.\n\nThe broader platform offers endpoints across four categories: Data & Analytics (metrics, reports, data export, insights), AI & Machine Learning (sentiment analysis, text summarization, classification, embeddings), Finance & Web3 (price feeds, exchange rates, token quotes, gas estimates), and Infrastructure utilities (geocoding, validation, conversion, generation). All endpoints are listed at $0.02 per request.\n\nThis particular endpoint (`/api/v1/payments/334`) is labeled \"Premium API Access\" but no further documentation describes what data or functionality it returns. The docs, pricing, API, and README pages all render only a \"Connect wallet\" prompt with no additional content. Without schema details or response examples, the actual payload returned by this endpoint remains unknown.","tags":[],"capabilities":["x402-payment","usdc-base-network","pay-per-request","no-api-key","http-post"],"categories":["api-platform","payments"],"synonyms":["x402 API","micropayment API","USDC pay-per-call","Base network API","lowpaymentfee","low payment fee API","crypto API access"],"warnings":["No documentation available — docs, pricing, API, and README pages all show only 'Connect wallet' with no content.","The endpoint name 'Premium API Access' is generic; it is unclear what data or functionality this endpoint provides.","No response schema or example responses are available to verify what the endpoint returns after payment.","Other endpoints on the platform (AI, analytics, finance, etc.) are advertised but none have been probed or verified."],"endpointUrl":"https://lowpaymentfee.com/api/v1/payments/334","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/334","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 documentation, no OpenAPI schema, no response examples, and no description of what 'Premium API Access' actually returns. The docs/pricing/README pages are all blank beyond a wallet-connect prompt. This is effectively a stub 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'/request':13,28 '0.02':12,27,79,150 '000':73 '20':72 '402':67 'Base network API' 'USDC pay-per-call' 'accept':46 'access':63,93,161 'across':109 'actual':198 'addit':189 'advertis':84 'ai':119 'analysi':123 'analyt':113 'api':5,20,38,62,86,160,176 'attach':96 'base':8,23,51,74 'broader':105 'call':4,19,81 'categori':111 'challeng':68 'classif':126 'connect':184 'content':190 'convers':143 'crypto API access' 'data':112,116,168 'describ':166 'detail':193 'doc':174 'document':165 'embed':127 'endpoint':55,108,146,155,203 'estim':137 'exampl':196 'exchang':132 'export':117 'feed':131 'financ':128 'four':110 'function':170 'gas':136 'generat':144 'geocod':141 'header':100 'http-post' 'i.e':78 'infrastructur':139 'insight':118 'instant':92 'key':87 'label':158 'learn':121 'limit':90 'list':59,148 'low payment fee API' 'lowpaymentfee' 'lowpaymentfee.com':31 'machin':120 'metric':114 'micropayment API' 'network':9,24,52 'no-api-key' 'offer':107 'page':179 'particular':154 'pay':2,17,35 'pay-per-cal':1,16 'pay-per-request':34 'payload':199 'payment':48,99 'per':3,18,36,80,151 'platform':6,21,39,83,106 'premium':61,159 'price':130,175 'prompt':186 'protocol':44 'quot':135 'rate':89,133 'readm':178 'remain':204 'render':181 'report':115 'request':37,69,103,152 'respons':195 'return':65,172,200 'schema':192 'sentiment':122 'simpli':95 'specif':54 'summar':125 'text':124 'token':134 'unit':75 'unknown':205 'usdc':15,30,47,77 'usdc-base-network' 'use':41 'util':140 'valid':142 'via':10,25 'wallet':185 'web3':129 'without':191 'x402':11,26,43,98 'x402 API' 'x402-payment'","prices":[{"id":"58d80b79-974e-4acd-acfe-d55164f534fe","listingId":"9839f4a7-56ab-4821-bc35-9897c4dea553","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/334","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:50:27.749Z"}],"sources":[{"listingId":"9839f4a7-56ab-4821-bc35-9897c4dea553","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/payments/334","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:50:27.749Z","lastSeenAt":"2026-04-23T23:02:46.202Z"}],"details":{"listingId":"9839f4a7-56ab-4821-bc35-9897c4dea553","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/payments/334 \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402-payment-header>\"","exampleRequest":null,"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"The endpoint returns a 402 challenge requesting up to 20,000 base units of USDC ($0.02) on Base network","source_url":"https://lowpaymentfee.com/api/v1/payments/334"},{"claim":"The platform advertises $0.02/request pricing with no API keys, no rate limits, and instant access","source_url":"https://lowpaymentfee.com"},{"claim":"The asset address 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 is USDC on Base","source_url":"https://lowpaymentfee.com"},{"claim":"Docs, pricing, API, and README pages render only a 'Connect wallet' prompt","source_url":"https://lowpaymentfee.com/docs"}],"useCases":["Programmatic access to premium API endpoints without traditional API key registration","Agent-driven workflows that need to pay per call using USDC on Base","Testing x402 protocol integrations with a low-cost endpoint"],"bestFor":["Developers experimenting with x402 payment protocol","AI agents that need keyless, pay-as-you-go API access","Users who prefer crypto micropayments over subscription billing"],"notFor":["Users who need detailed API documentation or response schemas before purchasing","High-volume consumers who want bulk pricing or subscription discounts","Anyone without a Base-network USDC wallet"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:07.023Z"},"updatedAt":"2026-04-23T23:02:46.202Z"}}