{"id":"259a2f7c-8669-4503-a545-82d67f9473ce","shortId":"Awj5R6","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/charges/295` 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 the same $0.02/request price point.\n\nThis particular endpoint (`/api/v1/charges/295`) is labeled \"Premium API Access\" but the crawled documentation provides no further detail on what data or functionality it returns. The docs, pricing, and API pages behind the landing page all appear to require a wallet connection and contain no additional content. Without more documentation, the actual response payload and use case for this specific endpoint remain unclear.","tags":[],"capabilities":["x402-payment","usdc-base-network","pay-per-request","no-api-key","http-post"],"categories":["api-platform","infrastructure"],"synonyms":["x402 API","pay-per-call API","USDC micropayment API","Base network API","lowpaymentfee","premium API access"],"warnings":["No documentation available for what /api/v1/charges/295 actually returns — the 'Premium API Access' label is the only description","All docs/pricing/API pages require wallet connection and contain no readable content","No OpenAPI spec, no request schema, no response schema available","The purpose and output of this specific endpoint are unknown"],"endpointUrl":"https://lowpaymentfee.com/api/v1/charges/295","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/charges/295","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 captured) and pricing is clear ($0.02 USDC on Base), but there is no documentation on what this specific endpoint actually returns, no request/response schema, and the docs pages are empty beyond a wallet-connect prompt. The listing is effectively a stub with confirmed 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'/request':13,28,153 '0.02':12,27,79,152 '000':73 '20':72 '402':67 'Base network API' 'USDC micropayment API' 'accept':46 'access':63,93,164 'across':109 'actual':206 'addit':200 'advertis':84 'ai':119 'analysi':123 'analyt':113 'api':5,20,38,62,86,163,184 'appear':191 'attach':96 'base':8,23,51,74 'behind':186 'broader':105 'call':4,19,81 'case':211 'categori':111 'challeng':68 'classif':126 'connect':196 'contain':198 'content':201 'convers':143 'crawl':167 'data':112,116,175 'detail':172 'doc':181 'document':168,204 'embed':127 'endpoint':55,108,146,158,215 'estim':137 'exchang':132 'export':117 'feed':131 'financ':128 'four':110 'function':177 'gas':136 'generat':144 'geocod':141 'header':100 'http-post' 'i.e':78 'infrastructur':139 'insight':118 'instant':92 'key':87 'label':161 'land':188 'learn':121 'limit':90 'list':59,148 'lowpaymentfee' 'lowpaymentfee.com':31 'machin':120 'metric':114 'network':9,24,52 'no-api-key' 'offer':107 'page':185,189 'particular':157 'pay':2,17,35 'pay-per-cal':1,16 'pay-per-call API' 'pay-per-request':34 'payload':208 'payment':48,99 'per':3,18,36,80 'platform':6,21,39,83,106 'point':155 'premium':61,162 'premium API access' 'price':130,154,182 'protocol':44 'provid':169 'quot':135 'rate':89,133 'remain':216 'report':115 'request':37,69,103 'requir':193 'respons':207 'return':65,179 'sentiment':122 'simpli':95 'specif':54,214 'summar':125 'text':124 'token':134 'unclear':217 'unit':75 'usdc':15,30,47,77 'usdc-base-network' 'use':41,210 'util':140 'valid':142 'via':10,25 'wallet':195 'web3':129 'without':202 'x402':11,26,43,98 'x402 API' 'x402-payment'","prices":[{"id":"b5d0f6ed-bebe-4378-839e-83dcd978b087","listingId":"259a2f7c-8669-4503-a545-82d67f9473ce","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/charges/295","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:44:58.696Z"}],"sources":[{"listingId":"259a2f7c-8669-4503-a545-82d67f9473ce","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/charges/295","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:44:58.696Z","lastSeenAt":"2026-04-24T13:31:59.840Z"}],"details":{"listingId":"259a2f7c-8669-4503-a545-82d67f9473ce","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/charges/295 \\\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 challenge requesting up to 20,000 base units of USDC ($0.02) on Base network","source_url":"https://lowpaymentfee.com/api/v1/charges/295"},{"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 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/charges/295"}],"useCases":["Programmatic access to a pay-per-request API without needing API keys or subscriptions","Agent-driven workflows that need to pay for API calls on-the-fly 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 want to avoid subscription commitments for occasional API calls"],"notFor":["Users who need detailed documentation or guaranteed SLAs before integrating","High-volume use cases where $0.02/request adds up and bulk pricing would be preferred","Anyone without a Base-network USDC wallet"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:22.849Z"},"updatedAt":"2026-04-24T13:31:59.840Z"}}