{"id":"572f3325-f238-4ad8-bc0b-245cac3d4437","shortId":"xAGGhY","kind":"x402","title":"Pay-per-call premium API access on Base via x402 — $0.02/request in USDC.","tagline":"Pay-per-call premium API access on Base via x402 — $0.02/request in USDC.","description":"This endpoint at lowpaymentfee.com provides \"Premium API Access\" via the x402 payment protocol. It is one of many endpoints offered by the lowpaymentfee.com platform, which hosts a collection of pay-per-request APIs spanning data & analytics, AI & machine learning, finance & Web3, and infrastructure utilities. All endpoints are priced at $0.02 per request, paid in USDC on the Base network, with no API keys, rate limits, or commitments required.\n\nThe specific endpoint `/api/v1/payments/313` is labeled \"Premium API Access\" in the x402 challenge but its exact functionality is not documented beyond that label. The x402 challenge confirms it is live, accepts POST requests, and requires a payment of up to 20,000 base units of USDC (0x8335…2913 on Base), which equals $0.02 given USDC's 6 decimals. Payment is sent to address 0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3 with a 300-second timeout.\n\nThe broader platform advertises endpoints for sentiment analysis, text summarization, classification, embeddings, price feeds, exchange rates, token quotes, gas estimates, geocoding, validation, conversion, and generation — all at the same $0.02 price point. However, documentation pages (/docs, /pricing, /api, /README) all returned only a \"Connect wallet\" prompt with no substantive content, so the actual request/response schemas for any of these endpoints remain unknown.","tags":[],"capabilities":["x402-payment","usdc-base","pay-per-request","no-api-key","post-endpoint"],"categories":["api-gateway","payments"],"synonyms":["x402 API","pay-per-call API","USDC micropayment API","Base network API","lowpaymentfee","low payment fee API","crypto-paid API"],"warnings":["The specific functionality of /api/v1/payments/313 ('Premium API Access') is not documented anywhere in the crawled material.","All documentation pages (/docs, /pricing, /api, /README) returned only 'Connect wallet' with no substantive content.","No request or response schema is available — callers cannot know what to send or what to expect back.","The endpoint path '/api/v1/payments/313' with a numeric ID suggests it may be a dynamic or user-specific resource rather than a general-purpose API."],"endpointUrl":"https://lowpaymentfee.com/api/v1/payments/313","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/313","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 the endpoint's actual functionality (\"Premium API Access\") is completely undocumented. All documentation pages return only a wallet-connect prompt with no content. No request/response schemas, no examples, and no description of what the endpoint actually 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'/api/v1/payments/313':103 '/docs':204 '/pricing':205 '/readme':207 '/request':13,28 '0.02':12,27,81,152,198 '000':141 '0x1a2b13e97f5f837c8f9fa1f95a1484b7c70d85f3':163 '0x8335':146 '20':140 '2913':147 '300':166 '6':156 'Base network API' 'USDC micropayment API' 'accept':130 'access':7,22,38,108 'actual':221 'address':162 'advertis':172 'ai':68 'analysi':176 'analyt':67 'api':6,21,37,64,93,107 'base':9,24,89,142,149 'beyond':120 'broader':170 'call':4,19 'challeng':112,125 'classif':179 'collect':58 'commit':98 'confirm':126 'connect':212 'content':218 'convers':191 'crypto-paid API' 'data':66 'decim':157 'document':119,202 'embed':180 'endpoint':32,49,77,102,173,228 'equal':151 'estim':188 'exact':115 'exchang':183 'feed':182 'financ':71 'function':116 'gas':187 'generat':193 'geocod':189 'given':153 'host':56 'howev':201 'infrastructur':74 'key':94 'label':105,122 'learn':70 'limit':96 'live':129 'low payment fee API' 'lowpaymentfee' 'lowpaymentfee.com':34,53 'machin':69 'mani':48 'network':90 'no-api-key' 'offer':50 'one':46 'page':203 'paid':84 'pay':2,17,61 'pay-per-cal':1,16 'pay-per-call API' 'pay-per-request':60 'payment':42,136,158 'per':3,18,62,82 'platform':54,171 'point':200 'post':131 'post-endpoint' 'premium':5,20,36,106 'price':79,181,199 'prompt':214 'protocol':43 'provid':35 'quot':186 'rate':95,184 'remain':229 'request':63,83,132 'request/response':222 'requir':99,134 'return':209 'schema':223 'second':167 'sent':160 'sentiment':175 'span':65 'specif':101 'substant':217 'summar':178 'text':177 'timeout':168 'token':185 'unit':143 'unknown':230 'usdc':15,30,86,145,154 'usdc-base' 'util':75 'valid':190 'via':10,25,39 'wallet':213 'web3':72 'x402':11,26,41,111,124 'x402 API' 'x402-payment'","prices":[{"id":"a82009c5-e591-491e-a2ad-9c8d51987d29","listingId":"572f3325-f238-4ad8-bc0b-245cac3d4437","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/313","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:50:18.673Z"}],"sources":[{"listingId":"572f3325-f238-4ad8-bc0b-245cac3d4437","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/payments/313","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:50:18.673Z","lastSeenAt":"2026-04-23T12:31:28.257Z"}],"details":{"listingId":"572f3325-f238-4ad8-bc0b-245cac3d4437","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/payments/313 \\\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":"Endpoint returns 402 with x402 challenge confirming it is live","source_url":"https://lowpaymentfee.com/api/v1/payments/313"},{"claim":"All endpoints priced at $0.02/request with no API keys, no rate limits, instant access on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset address 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base","source_url":"https://lowpaymentfee.com/api/v1/payments/313"},{"claim":"Platform offers 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 on Base","Agent-driven workflows that need keyless, pay-as-you-go API access","Testing x402 payment protocol integrations against a live endpoint"],"bestFor":["Developers experimenting with x402 payment protocol","Agents needing keyless pay-per-call API access on Base","Low-volume consumers who want no subscription commitments"],"notFor":["Users who need detailed API documentation or guaranteed SLAs","High-volume use cases where $0.02/request adds up significantly","Anyone without a Base-compatible USDC wallet"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:07.508Z"},"updatedAt":"2026-04-23T12:31:28.257Z"}}