{"id":"7f70dd0c-c993-4730-a54e-419262087678","shortId":"PDL3bV","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, settled in USDC on the Base network, with no API keys, rate limits, or commitments required.\n\nThe specific endpoint `/api/v1/payments/161` 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 made 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, README) returned only a \"Connect wallet\" prompt with no further technical detail, so the actual request/response schemas for this or any other endpoint remain unknown.","tags":[],"capabilities":["x402-payment","usdc-base-network","pay-per-request","no-api-key","post-endpoint","json-response"],"categories":["api-gateway","payments"],"synonyms":["lowpaymentfee","low payment fee API","x402 premium API","pay-per-call API","USDC micropayment API","Base network API"],"warnings":["The exact functionality of /api/v1/payments/161 ('Premium API Access') is not documented anywhere in the crawled material.","All documentation pages (docs, pricing, README, api) returned only 'Connect wallet' with no technical content.","No request or response schema is available; callers cannot know what to send or expect back.","The endpoint path '/api/v1/payments/161' does not match any of the advertised API categories on the homepage, raising questions about what it actually does."],"endpointUrl":"https://lowpaymentfee.com/api/v1/payments/161","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/161","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. No request/response schemas, no docs pages with content, and no examples are available. The listing is effectively a 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'/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':220 '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':210 'convers':191 'data':66 'decim':157 'detail':217 'doc':204 '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 'json-response' 'key':94 'label':105,122 'learn':70 'limit':96 'live':129 'low payment fee API' 'lowpaymentfee' 'lowpaymentfee.com':34,53 'machin':69 'made':160 'mani':48 'network':90 'no-api-key' 'offer':50 'one':46 'page':203 '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':79,181,199,205 'prompt':212 'protocol':43 'provid':35 'quot':186 'rate':95,184 'readm':206 'remain':229 'request':63,83,132 'request/response':221 'requir':99,134 'return':207 'schema':222 'second':167 'sentiment':175 'settl':84 'span':65 'specif':101 'summar':178 'technic':216 'text':177 'timeout':168 'token':185 'unit':143 'unknown':230 'usdc':15,30,86,145,154 'usdc-base-network' 'util':75 'valid':190 'via':10,25,39 'wallet':211 'web3':72 'x402':11,26,41,111,124 'x402 premium API' 'x402-payment'","prices":[{"id":"e32c2c3a-2688-4635-b50f-841f314f0127","listingId":"7f70dd0c-c993-4730-a54e-419262087678","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/161","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:49:37.167Z"}],"sources":[{"listingId":"7f70dd0c-c993-4730-a54e-419262087678","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/payments/161","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:49:37.167Z","lastSeenAt":"2026-04-23T17:31:47.849Z"}],"details":{"listingId":"7f70dd0c-c993-4730-a54e-419262087678","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/payments/161 \\\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/161"},{"claim":"All endpoints priced at $0.02 per 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 with maxAmountRequired of 20000 base units ($0.02)","source_url":"https://lowpaymentfee.com/api/v1/payments/161"},{"claim":"Platform offers endpoints 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-gated APIs","AI agents that can settle USDC payments on Base automatically","Users who want no-commitment, no-signup API access"],"notFor":["Users who need detailed API documentation or guaranteed SLAs","Anyone without a Base-compatible USDC wallet","High-volume use cases where per-request pricing may add up"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:09.396Z"},"updatedAt":"2026-04-23T17:31:47.849Z"}}