{"id":"7336033e-3819-42f1-ab7b-3af835967174","shortId":"jUVCTh","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/charges/34` is labeled \"Premium API Access\" in the x402 challenge but lacks detailed documentation about what data or functionality it returns. The x402 challenge confirms it is live, accepts POST requests, and requires a payment of up to 20,000 base units of USDC (0.02 USD, since USDC uses 6 decimals) to the address `0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3`. 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 resolve to a minimal \"Connect wallet\" page with no further technical detail. Without OpenAPI schemas, example requests/responses, or detailed docs, the exact input parameters and output format for this specific endpoint remain unknown.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","pay-per-request","json-response","no-api-key"],"categories":["api-gateway","infrastructure"],"synonyms":["premium API","lowpaymentfee","x402 API","micropayment API","pay-per-call API","USDC API access","Base network API"],"warnings":["The specific functionality of /api/v1/charges/34 ('Premium API Access') is not documented anywhere in the crawled material.","All documentation pages (/docs, /pricing, /README, /api) return only a 'Connect wallet' prompt with no technical content.","No OpenAPI spec, input schema, or example responses are available — callers cannot know what to send or what to expect back.","The endpoint path '/api/v1/charges/34' with a numeric ID suggests this may be a charge/invoice endpoint rather than a reusable API, but this is unconfirmed."],"endpointUrl":"https://lowpaymentfee.com/api/v1/charges/34","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/34","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 is entirely undocumented. No OpenAPI schema, no example requests or responses, and all documentation pages render only a 'Connect wallet' prompt. The label 'Premium API Access' is generic and uninformative. This is effectively a stub 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'/request':13,28 '0.02':12,27,81,147,190 '000':142 '0x1a2b13e97f5f837c8f9fa1f95a1484b7c70d85f3':157 '20':141 '6':152 'Base network API' 'USDC API access' 'accept':131 'access':7,22,38,108 'address':156 'advertis':167 'ai':68 'analysi':171 'analyt':67 'api':6,21,37,64,93,107 'application/json':163 'base':9,24,89,143 'base-network' 'broader':165 'call':4,19 'challeng':112,126 'classif':174 'collect':58 'commit':98 'confirm':127 'connect':204 'convers':182 'data':66,119,184 'decim':153 'detail':115,211,218 'doc':196,219 'document':116,194 'embed':175 'endpoint':32,49,77,102,168,230 'exact':221 'exampl':215 'exchang':178 'export':185 'feed':177 'financ':71 'format':226 'function':121 'geocod':180 'host':56 'howev':193 'infrastructur':74 'input':222 'json-response' 'key':94 'label':105 'lack':114 'learn':70 'limit':96 'live':130 'lowpaymentfee' 'lowpaymentfee.com':34,53 'machin':69 'mani':48 'micropayment API' 'mime':160 'minim':203 'network':90 'no-api-key' 'offer':50 'one':46 'openapi':213 'output':225 'page':195,206 'paramet':223 'pay':2,17,61 'pay-per-cal':1,16 'pay-per-call API' 'pay-per-request':60 'payment':42,137 'per':3,18,62,82 'platform':54,166 'point':192 'post':132 'premium':5,20,36,106 'premium API' 'price':79,176,191,197 'protocol':43 'provid':35 'rate':95,179 'readm':198 'remain':231 'request':63,83,133 'requests/responses':216 'requir':99,135 'resolv':200 'respons':159 'return':123 'schema':214 'sentiment':170 'settl':84 'sinc':149 'span':65 'specif':101,229 'summar':173 'technic':210 'text':172 'type':161 'unit':144 'unknown':232 'usd':148 'usdc':15,30,86,146,150 'usdc-settlement' 'use':151 'util':75 'valid':181 'via':10,25,39 'wallet':205 'web3':72 'without':212 'x402':11,26,41,111,125 'x402 API' 'x402-payment'","prices":[{"id":"2504903f-bb3d-4d93-a0f8-d186054e8817","listingId":"7336033e-3819-42f1-ab7b-3af835967174","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/34","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:45:17.498Z"}],"sources":[{"listingId":"7336033e-3819-42f1-ab7b-3af835967174","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/charges/34","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:45:17.498Z","lastSeenAt":"2026-04-23T23:32:10.045Z"}],"details":{"listingId":"7336033e-3819-42f1-ab7b-3af835967174","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/charges/34 \\\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/charges/34"},{"claim":"All endpoints are priced at $0.02 per request with no API keys, no rate limits, and instant access on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"The platform offers APIs 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/34"}],"useCases":["Programmatic access to premium API functionality with per-request USDC micropayments","Agent-driven workflows that need keyless, on-demand API access settled on Base","Exploring x402 payment protocol integration for pay-as-you-go services"],"bestFor":["Developers experimenting with x402 payment protocol","Agents needing keyless, instant API access without subscriptions","Low-volume or sporadic API consumers who prefer per-call pricing"],"notFor":["Users who need detailed API documentation or guaranteed SLAs before integrating","High-volume consumers who would benefit from bulk pricing or rate-limited plans","Anyone without a Base-network USDC wallet"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:22.028Z"},"updatedAt":"2026-04-23T23:32:10.045Z"}}