{"id":"23be86da-6c1d-4094-93a2-6732f4e50d0b","shortId":"R3b9QP","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 catalog 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, no rate limits, and no commitments required.\n\nThe specific endpoint `/api/v1/payments/190` 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 charges a maximum of 20,000 base units of USDC (0.02 USD, since USDC uses 6 decimals) per call, paid to address `0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3` on Base. The response MIME type is `application/json`.\n\nThe broader platform advertises endpoints for sentiment analysis, text summarization, classification, embeddings, price feeds, exchange rates, geocoding, validation, conversion, and data export — all at the same $0.02 price point. However, documentation pages (docs, pricing, README) all returned only a \"Connect wallet\" prompt with no substantive content, so the actual request/response schemas for any of these endpoints remain undocumented.","tags":[],"capabilities":["x402-payment","usdc-base","pay-per-request","json-response","no-api-key","post-method"],"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/190 is undocumented; 'Premium API Access' is the only description available.","All documentation pages (docs, pricing, README, api) returned only 'Connect wallet' with no substantive content.","No request or response schema is available; integrators cannot determine what inputs are expected or what outputs are returned.","The broader platform lists many endpoints but none have documented schemas or example payloads."],"endpointUrl":"https://lowpaymentfee.com/api/v1/payments/190","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/190","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 network details, but the endpoint's actual functionality (\"Premium API Access\") is entirely opaque — no request/response schema, no documentation, and all doc pages return only a wallet-connect prompt. The listing is effectively a stub with verified 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'/request':13,28 '0.02':12,27,81,146,193 '000':141 '0x1a2b13e97f5f837c8f9fa1f95a1484b7c70d85f3':158 '20':140 '6':151 'Base network API' 'USDC micropayment API' 'accept':132 'access':7,22,38,110 'actual':215 'address':157 'advertis':170 'ai':68 'analysi':174 'analyt':67 'api':6,21,37,64,93,109 'application/json':166 'base':9,24,89,142,160 'beyond':122 'broader':168 'call':4,19,154 'catalog':58 'challeng':114,127 'charg':136 'classif':177 'commit':100 'confirm':128 'connect':206 'content':212 'convers':185 'data':66,187 'decim':152 'doc':199 'document':121,197 'embed':178 'endpoint':32,49,77,104,171,222 'exact':117 'exchang':181 'export':188 'feed':180 'financ':71 'function':118 'geocod':183 'host':56 'howev':196 'infrastructur':74 'json-response' 'key':94 'label':107,124 'learn':70 'limit':97 'live':131 'low payment fee API' 'lowpaymentfee' 'lowpaymentfee.com':34,53 'machin':69 'mani':48 'maximum':138 'mime':163 'network':90 'no-api-key' 'offer':50 'one':46 'page':198 'paid':155 'pay':2,17,61 'pay-per-cal':1,16 'pay-per-call API' 'pay-per-request':60 'payment':42 'per':3,18,62,82,153 'platform':54,169 'point':195 'post':133 'post-method' 'premium':5,20,36,108 'price':79,179,194,200 'prompt':208 'protocol':43 'provid':35 'rate':96,182 'readm':201 'remain':223 'request':63,83,134 'request/response':216 'requir':101 'respons':162 'return':203 'schema':217 'sentiment':173 'settl':84 'sinc':148 'span':65 'specif':103 'substant':211 'summar':176 'text':175 'type':164 'undocu':224 'unit':143 'usd':147 'usdc':15,30,86,145,149 'usdc-base' 'use':150 'util':75 'valid':184 'via':10,25,39 'wallet':207 'web3':72 'x402':11,26,41,113,126 'x402 premium API' 'x402-payment'","prices":[{"id":"d300a782-e1a2-4b6d-9f80-811f9552d36b","listingId":"23be86da-6c1d-4094-93a2-6732f4e50d0b","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/190","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:49:51.064Z"}],"sources":[{"listingId":"23be86da-6c1d-4094-93a2-6732f4e50d0b","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/payments/190","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:49:51.064Z","lastSeenAt":"2026-04-23T16:07:16.499Z"}],"details":{"listingId":"23be86da-6c1d-4094-93a2-6732f4e50d0b","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/payments/190 \\\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 on Base network","source_url":"https://lowpaymentfee.com/api/v1/payments/190"},{"claim":"Max amount required is 20000 base units of USDC (USD Coin, 6 decimals = $0.02)","source_url":"https://lowpaymentfee.com/api/v1/payments/190"},{"claim":"Platform advertises $0.02/request pricing with no API keys, no rate limits, and instant access","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset contract on Base: 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/payments/190"},{"claim":"Documentation pages return only 'Connect wallet' with no content","source_url":"https://lowpaymentfee.com/docs"}],"useCases":["Accessing premium API functionality with per-request USDC micropayments on Base","Agent-driven API consumption without pre-registration or API keys","Testing x402 payment protocol integrations against a live endpoint"],"bestFor":["Developers exploring x402 pay-per-call patterns","Agents needing keyless, instant API access on Base","Low-volume consumers who want no subscription commitments"],"notFor":["Users who need detailed API documentation or schemas before integrating","High-volume consumers who would benefit from bulk pricing or subscriptions","Anyone without a Base-compatible USDC wallet"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:08.715Z"},"updatedAt":"2026-04-23T16:07:16.499Z"}}