{"id":"61a7b58e-d0e6-4f59-932a-b670682b054b","shortId":"KTguZB","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, no rate limits, and no commitments required.\n\nThe specific endpoint `/api/v1/charges/52` is labeled \"Premium API Access\" in the x402 challenge. The challenge confirms it accepts exact-scheme payments 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 via the X-PAYMENT header on a POST request, and the endpoint returns application/json. The x402 version is 1 with a max timeout of 300 seconds.\n\nUnfortunately, the crawled documentation, pricing, and API pages all returned only a \"Connect wallet\" prompt with no further content, so the actual functionality behind this specific charge endpoint is unclear. The landing page lists many sibling endpoints (sentiment analysis, text summarization, geocoding, price feeds, etc.) but does not describe what `/api/v1/charges/52` specifically does. Without documentation or an OpenAPI schema, the exact input parameters and response format remain unknown.","tags":[],"capabilities":["x402-payment","usdc-base-settlement","pay-per-request","json-response","no-api-key","no-rate-limit"],"categories":["api","infrastructure"],"synonyms":["premium API","x402 API","pay-per-call API","USDC API","Base network API","lowpaymentfee","micropayment API"],"warnings":["The specific functionality of /api/v1/charges/52 ('Premium API Access') is not documented anywhere in the crawled material.","All documentation, pricing, and API pages returned only a 'Connect wallet' prompt with no substantive content.","No OpenAPI schema or input/output examples are available.","The endpoint name 'charges/52' is generic and does not indicate what service it provides."],"endpointUrl":"https://lowpaymentfee.com/api/v1/charges/52","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/52","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 confirmed) and pricing is clear ($0.02 USDC on Base), but there is no documentation, no OpenAPI schema, no example requests or responses, and the specific functionality of /api/v1/charges/52 is undescribed. The docs/pricing/API pages all returned only 'Connect wallet' with no useful 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'/request':13,28 '0.02':12,27,81,139 '000':128 '0x8335':133 '1':167 '20':127 '2913':134 '300':173 '6':143 'Base network API' 'USDC API' 'accept':119 'access':7,22,38,110 'actual':196 'ai':68 'analysi':213 'analyt':67 'api':6,21,37,64,93,109,181 'application/json':162 'base':9,24,89,129,136 'behind':198 'call':4,19 'challeng':114,116 'charg':201 'collect':58 'commit':100 'confirm':117 'connect':187 'content':193 'crawl':177 'data':66 'decim':144 'describ':223 'document':178,229 'endpoint':32,49,77,104,160,202,211 'equal':138 'etc':219 'exact':121,235 'exact-schem':120 'feed':218 'financ':71 'format':240 'function':197 'geocod':216 'given':140 'header':153 'host':56 'infrastructur':74 'input':236 'json-response' 'key':94 'label':107 'land':206 'learn':70 'limit':97 'list':208 'lowpaymentfee' 'lowpaymentfee.com':34,53 'machin':69 'made':147 'mani':48,209 'max':170 'micropayment API' 'network':90 'no-api-key' 'no-rate-limit' 'offer':50 'one':46 'openapi':232 'page':182,207 'paramet':237 'pay':2,17,61 'pay-per-cal':1,16 'pay-per-call API' 'pay-per-request':60 'payment':42,123,145,152 'per':3,18,62,82 'platform':54 'post':156 'premium':5,20,36,108 'premium API' 'price':79,179,217 'prompt':189 'protocol':43 'provid':35 'rate':96 'remain':241 'request':63,83,157 'requir':101 'respons':239 'return':161,184 'schema':233 'scheme':122 'second':174 'sentiment':212 'settl':84 'sibl':210 'span':65 'specif':103,200,226 'summar':215 'text':214 'timeout':171 'unclear':204 'unfortun':175 'unit':130 'unknown':242 'usdc':15,30,86,132,141 'usdc-base-settlement' 'util':75 'version':165 'via':10,25,39,148 'wallet':188 'web3':72 'without':228 'x':151 'x-payment':150 'x402':11,26,41,113,164 'x402 API' 'x402-payment'","prices":[{"id":"298fb365-2473-4a10-a79a-0130cf0a6edd","listingId":"61a7b58e-d0e6-4f59-932a-b670682b054b","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/52","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:45:21.707Z"}],"sources":[{"listingId":"61a7b58e-d0e6-4f59-932a-b670682b054b","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/charges/52","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:45:21.707Z","lastSeenAt":"2026-04-22T11:31:35.084Z"}],"details":{"listingId":"61a7b58e-d0e6-4f59-932a-b670682b054b","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/charges/52 \\\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 accepting USDC on Base, maxAmountRequired 20000 base units","source_url":"https://lowpaymentfee.com/api/v1/charges/52"},{"claim":"Platform lists APIs at $0.02/request with no API keys, no rate limits, and instant access on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"USDC contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/charges/52"}],"useCases":["Accessing a pay-per-request API without needing API keys or subscriptions","Programmatic agent-driven API consumption with on-chain USDC micropayments","Testing x402 payment protocol integrations on Base"],"bestFor":["Developers wanting zero-commitment, pay-as-you-go API access","AI agents that can settle x402 payments autonomously","Users who prefer crypto-native micropayments over subscription billing"],"notFor":["Users needing detailed API documentation or OpenAPI specs before integrating","High-volume use cases where per-request pricing may add up compared to flat-rate plans","Users without access to USDC on Base network"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:21.786Z"},"updatedAt":"2026-04-22T11:31:35.084Z"}}