{"id":"1d96add9-604d-48e1-ad8f-6110c778495f","shortId":"q6JzAm","kind":"x402","title":"Pay-per-call API platform on Base (USDC) via x402 — $0.02/request, no API keys required.","tagline":"Pay-per-call API platform on Base (USDC) via x402 — $0.02/request, no API keys required.","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/payments/138` is listed as \"Premium API Access\" and charges 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 the same $0.02/request price point.\n\nThis particular endpoint (`/api/v1/payments/138`) is labeled generically as \"Premium API Access\" and does not appear in the main site's listed API catalog. There is no documentation, OpenAPI schema, or example request/response available for this specific endpoint, so its exact functionality is unclear. The x402 challenge confirms it is live and accepting POST requests, settling payments to address `0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3` in USDC on Base.","tags":[],"capabilities":["x402-payment","usdc-base-network","pay-per-request","no-api-key","post-method","json-response"],"categories":["api-platform","payments"],"synonyms":["x402 API","pay-per-call API","USDC API","Base network API","micropayment API","lowpaymentfee","low payment fee"],"warnings":["No documentation, OpenAPI spec, or usage examples available for this specific endpoint","Endpoint path /api/v1/payments/138 does not appear in the site's published API catalog — its actual functionality is unknown","Docs, pricing, API, and README pages all returned only 'Connect wallet' with no substantive content","No input or output schema provided beyond the basic x402 challenge metadata"],"endpointUrl":"https://lowpaymentfee.com/api/v1/payments/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/payments/138","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.300","qualityRationale":"The x402 challenge is live and confirms pricing and payment details, but there is no documentation, no OpenAPI schema, no example requests or responses, and the specific endpoint's functionality is entirely undescribed. The endpoint path (/api/v1/payments/138) does not match any of the documented APIs on the site. This is effectively a stub 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'/request':13,30,152 '0.02':12,29,78,151 '000':72 '0x1a2b13e97f5f837c8f9fa1f95a1484b7c70d85f3':213 '20':71 'Base network API' 'USDC API' 'accept':50,206 'access':66,92,165 'across':108 'address':212 'advertis':83 'ai':118 'analysi':122 'analyt':112 'api':5,15,22,32,42,65,85,164,176 'appear':169 'attach':95 'avail':187 'base':8,25,55,73,217 'broader':104 'call':4,21,80 'catalog':177 'categori':110 'challeng':200 'charg':68 'classif':125 'confirm':201 'convers':142 'data':111,115 'document':181 'embed':126 'endpoint':59,107,145,157,191 'estim':136 'exact':194 'exampl':185 'exchang':131 'export':116 'feed':130 'financ':127 'four':109 'function':195 'gas':135 'generat':143 'generic':161 'geocod':140 'header':99 'i.e':77 'infrastructur':138 'insight':117 'instant':91 'json-response' 'key':16,33,86 'label':160 'learn':120 'limit':89 'list':62,147,175 'live':204 'low payment fee' 'lowpaymentfee' 'lowpaymentfee.com':35 'machin':119 'main':172 'metric':113 'micropayment API' 'network':56 'no-api-key' 'offer':106 'openapi':182 'particular':156 'pay':2,19,39 'pay-per-cal':1,18 'pay-per-call API' 'pay-per-request':38 'payment':52,98,210 'per':3,20,40,79 'platform':6,23,43,82,105 'point':154 'post':207 'post-method' 'premium':64,163 'price':129,153 'protocol':48 'quot':134 'rate':88,132 'report':114 'request':41,102,208 'request/response':186 'requir':17,34 'schema':183 'sentiment':121 'settl':209 'simpli':94 'site':173 'specif':58,190 'summar':124 'text':123 'token':133 'unclear':197 'unit':74 'usdc':9,26,51,76,215 'usdc-base-network' 'use':45 'util':139 'valid':141 'via':10,27 'web3':128 'x402':11,28,47,97,199 'x402 API' 'x402-payment'","prices":[{"id":"6283bfd5-3a19-44e8-8aef-f5a2bd227707","listingId":"1d96add9-604d-48e1-ad8f-6110c778495f","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/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":"2026-04-18T18:49:31.145Z"}],"sources":[{"listingId":"1d96add9-604d-48e1-ad8f-6110c778495f","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/payments/138","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:49:31.145Z","lastSeenAt":"2026-04-24T08:32:23.493Z"}],"details":{"listingId":"1d96add9-604d-48e1-ad8f-6110c778495f","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/payments/138 \\\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":"The endpoint returns a 402 x402 challenge with maxAmountRequired of 20000 base units of USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/payments/138"},{"claim":"USDC asset contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/payments/138"},{"claim":"Platform advertises $0.02/request pricing with no API keys, no rate limits, and instant access","source_url":"https://lowpaymentfee.com"},{"claim":"The site lists APIs across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"}],"useCases":["Accessing premium API functionality with per-request USDC micropayments","Integrating pay-as-you-go API calls into agent workflows without managing API keys","Testing x402 protocol payment flows on Base network"],"bestFor":["Developers wanting zero-signup, pay-per-call API access","AI agents that can settle x402 payments autonomously","Users who prefer crypto micropayments over subscription billing"],"notFor":["Users needing detailed API documentation or guaranteed SLAs","High-volume consumers who would benefit from bulk pricing or subscriptions","Anyone without a Base-network USDC wallet"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:09.662Z"},"updatedAt":"2026-04-24T08:32:23.493Z"}}