{"id":"805c0ea1-2d6e-49cc-b0da-991e3918773c","shortId":"jgtFWG","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 `/api/v1/transactions/39` 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 — callers simply attach an X-PAYMENT header with a valid x402 payment proof.\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 priced at $0.02 per request.\n\nThis particular endpoint (`/api/v1/transactions/39`) is labeled \"Premium API Access\" but its actual functionality is not documented beyond that label. The crawled docs, pricing, API, and README pages all rendered only a \"Connect wallet\" prompt with no additional content. Without further documentation or example responses, the exact data returned by this endpoint remains unclear.","tags":[],"capabilities":["x402-payment","usdc-base-network","pay-per-request","no-api-key","http-post","json-response"],"categories":["api-platform","finance"],"synonyms":["low payment fee","x402 api","pay per call api","usdc api","base network api","micropayment api","402 payment api"],"warnings":["The exact functionality of /api/v1/transactions/39 ('Premium API Access') is undocumented — it is unclear what data or service it provides.","All documentation pages (docs, pricing, API, README) returned only 'Connect wallet' with no substantive content.","No OpenAPI spec, no request/response schemas, and no usage examples are available.","The endpoint name 'transactions/39' with a numeric ID suggests it may be a specific resource rather than a general-purpose API."],"endpointUrl":"https://lowpaymentfee.com/api/v1/transactions/39","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/39","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 example request/response, and the actual functionality behind \"Premium API Access\" is entirely undocumented. The docs, pricing, API, and README pages all render only a wallet-connect prompt with no useful 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'/request':13,28 '0.02':12,27,78,153 '000':72 '20':71 '402':66 '402 payment api' 'accept':46 'access':62,92,164 'across':112 'actual':167 'addit':192 'advertis':83 'ai':122 'analysi':126 'analyt':116 'api':5,20,38,61,85,163,179 'attach':95 'base':8,23,51,73 'base network api' 'beyond':172 'broader':108 'call':4,19,80 'caller':93 'categori':114 'challeng':67 'classif':129 'connect':187 'content':193 'convers':146 'crawl':176 'data':115,119,202 'doc':177 'document':171,196 'embed':130 'endpoint':55,111,149,158,206 'estim':140 'exact':201 'exampl':198 'exchang':135 'export':120 'feed':134 'financ':131 'four':113 'function':168 'gas':139 'generat':147 'geocod':144 'header':100 'http-post' 'i.e':77 'infrastructur':142 'insight':121 'instant':91 'json-response' 'key':86 'label':161,174 'learn':124 'limit':89 'list':58 'low payment fee' 'lowpaymentfee.com':31 'machin':123 'metric':117 'micropayment api' 'network':9,24,52 'no-api-key' 'offer':110 'page':182 'particular':157 'pay':2,17,35 'pay per call api' 'pay-per-cal':1,16 'pay-per-request':34 'payment':48,99,105 'per':3,18,36,79,154 'platform':6,21,39,82,109 'premium':60,162 'price':133,151,178 'prompt':189 'proof':106 'protocol':44 'quot':138 'rate':88,136 'readm':181 'remain':207 'render':184 'report':118 'request':37,68,155 'respons':199 'return':64,203 'sentiment':125 'simpli':94 'specif':54 'summar':128 'text':127 'token':137 'unclear':208 'unit':74 'usdc':15,30,47,76 'usdc api' 'usdc-base-network' 'use':41 'util':143 'valid':103,145 'via':10,25 'wallet':188 'web3':132 'without':194 'x':98 'x-payment':97 'x402':11,26,43,104 'x402 api' 'x402-payment'","prices":[{"id":"0c3510f8-b24d-43f9-8a0e-b184e6a499c5","listingId":"805c0ea1-2d6e-49cc-b0da-991e3918773c","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/39","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T19:26:49.624Z"}],"sources":[{"listingId":"805c0ea1-2d6e-49cc-b0da-991e3918773c","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/transactions/39","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T19:26:49.624Z","lastSeenAt":"2026-04-23T08:31:55.681Z"}],"details":{"listingId":"805c0ea1-2d6e-49cc-b0da-991e3918773c","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/transactions/39 \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402-payment-proof>\"","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/transactions/39"},{"claim":"The platform advertises $0.02/request pricing with no API keys, no rate limits, and instant access on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"The platform offers endpoints across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"},{"claim":"The USDC asset address is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base","source_url":"https://lowpaymentfee.com/api/v1/transactions/39"}],"useCases":["Programmatic access to premium API data with per-request USDC micropayments","Agent-driven workflows that need keyless, on-demand API access","Testing x402 payment protocol integrations on Base network"],"bestFor":["Developers or agents wanting frictionless pay-per-use API access without subscriptions","x402-compatible AI agents that can settle USDC on Base","Users who prefer crypto micropayments over traditional API key management"],"notFor":["Users who need detailed API documentation or guaranteed SLAs before purchasing","High-volume consumers who would benefit from bulk pricing or subscriptions","Anyone without a Base-network USDC wallet or x402-compatible client"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:36.814Z"},"updatedAt":"2026-04-23T08:31:55.681Z"}}