{"id":"24dd7672-bd77-4a10-98d4-c5a06d8c4300","shortId":"mrR3gt","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/45` is listed as \"Premium API Access\" and returns a 402 challenge requiring payment of 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\nThe specific functionality behind `/api/v1/transactions/45` is not documented beyond the label \"Premium API Access.\" The crawled docs, pricing, API, and README pages all rendered only a \"Connect wallet\" prompt with no additional content, so the actual request/response schemas and detailed behavior of this endpoint remain unknown. Callers should expect a POST method with JSON mime type based on the x402 challenge metadata.","tags":[],"capabilities":["x402-payment","usdc-base-network","pay-per-request","no-api-key","post-json"],"categories":["api-platform","finance"],"synonyms":["x402 API","pay-per-call API","USDC micropayment API","Base network API","lowpaymentfee","low payment fee API","crypto-paid API"],"warnings":["The actual functionality of /api/v1/transactions/45 is undocumented — 'Premium API Access' is the only description available.","No OpenAPI spec, request schema, or response schema is provided.","All documentation pages (docs, pricing, API, README) render only 'Connect wallet' with no useful content.","The endpoint path '/api/v1/transactions/45' suggests a resource-specific route (transaction ID 45) but no context is given for what this represents."],"endpointUrl":"https://lowpaymentfee.com/api/v1/transactions/45","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/45","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.300","qualityRationale":"The endpoint is live (402 challenge confirmed) and pricing is clear ($0.02 USDC on Base), but there is no documentation, no OpenAPI schema, no request/response examples, and the actual functionality behind 'Premium API Access' at /api/v1/transactions/45 is completely undocumented. All doc pages returned only 'Connect wallet' with no 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'/request':13,28 '0.02':12,27,80,155 '000':74 '20':73 '402':66 'Base network API' 'USDC micropayment API' 'accept':46 'access':62,94,171 'across':114 'actual':193 'addit':189 'advertis':85 'ai':124 'analysi':128 'analyt':118 'api':5,20,38,61,87,170,176 'attach':97 'base':8,23,51,75,214 'behavior':198 'behind':161 'beyond':166 'broader':110 'call':4,19,82 'caller':95,204 'categori':116 'challeng':67,218 'classif':131 'connect':184 'content':190 'convers':148 'crawl':173 'crypto-paid API' 'data':117,121 'detail':197 'doc':174 'document':165 'embed':132 'endpoint':55,113,151,201 'estim':142 'exchang':137 'expect':206 'export':122 'feed':136 'financ':133 'four':115 'function':160 'gas':141 'generat':149 'geocod':146 'header':102 'i.e':79 'infrastructur':144 'insight':123 'instant':93 'json':211 'key':88 'label':168 'learn':126 'limit':91 'list':58 'low payment fee API' 'lowpaymentfee' 'lowpaymentfee.com':31 'machin':125 'metadata':219 'method':209 'metric':119 'mime':212 'network':9,24,52 'no-api-key' 'offer':112 'page':179 'pay':2,17,35 'pay-per-cal':1,16 'pay-per-call API' 'pay-per-request':34 'payment':48,69,101,107 'per':3,18,36,81,156 'platform':6,21,39,84,111 'post':208 'post-json' 'premium':60,169 'price':135,153,175 'prompt':186 'proof':108 'protocol':44 'quot':140 'rate':90,138 'readm':178 'remain':202 'render':181 'report':120 'request':37,157 'request/response':194 'requir':68 'return':64 'schema':195 'sentiment':127 'simpli':96 'specif':54,159 'summar':130 'text':129 'token':139 'type':213 'unit':76 'unknown':203 'usdc':15,30,47,78 'usdc-base-network' 'use':41 'util':145 'valid':105,147 'via':10,25 'wallet':185 'web3':134 'x':100 'x-payment':99 'x402':11,26,43,106,217 'x402 API' 'x402-payment'","prices":[{"id":"6ef91246-9fe3-457e-aabf-19d7dfdebca7","listingId":"24dd7672-bd77-4a10-98d4-c5a06d8c4300","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/45","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T19:26:47.841Z"}],"sources":[{"listingId":"24dd7672-bd77-4a10-98d4-c5a06d8c4300","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/transactions/45","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T19:26:47.841Z","lastSeenAt":"2026-04-23T08:31:55.610Z"}],"details":{"listingId":"24dd7672-bd77-4a10-98d4-c5a06d8c4300","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/transactions/45 \\\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 requiring up to 20,000 base units of USDC ($0.02) on Base network","source_url":"https://lowpaymentfee.com/api/v1/transactions/45"},{"claim":"All endpoints are priced at $0.02 per request with no API keys, no rate limits, and instant access","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":"USDC asset address is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base","source_url":"https://lowpaymentfee.com/api/v1/transactions/45"}],"useCases":["Accessing premium API data with per-request USDC micropayments on Base","Integrating pay-as-you-go API calls into agent workflows without API key management","Making one-off API requests without subscription commitments"],"bestFor":["Developers who want keyless, pay-per-use API access","AI agents with x402-compatible wallets on Base","Users who prefer crypto micropayments over subscription billing"],"notFor":["Users who need detailed API documentation or OpenAPI schemas before integrating","High-volume consumers who would benefit from bulk/subscription pricing","Users without a Base-network USDC wallet"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:36.897Z"},"updatedAt":"2026-04-23T08:31:55.610Z"}}