{"id":"20c207ac-7643-4759-a86d-482f045f7f71","shortId":"5FrCJx","kind":"x402","title":"x402-gated premium API access on Base, pay $0.02 per request in USDC.","tagline":"x402-gated premium API access on Base, pay $0.02 per 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 on the platform are priced at $0.02 per request, settled in USDC on the Base network.\n\nThe specific endpoint `/api/v1/charges/338` is labeled \"Premium API Access\" in the x402 challenge but lacks detailed documentation about what data or functionality it returns. The probe confirms the endpoint is live, returning a valid x402 402 challenge with `maxAmountRequired` of 20,000 base units of USDC (which equals $0.02 given USDC's 6 decimals). Payment is made via the x402 exact scheme to the specified wallet address on Base. The endpoint accepts POST requests and returns `application/json`.\n\nThe broader platform advertises no API keys, no rate limits, and instant access. However, documentation pages (docs, pricing, README) all resolve to a minimal \"Connect wallet\" prompt with no substantive content. There is no OpenAPI schema, no request/response examples, and no description of what this particular charge endpoint actually does beyond its generic title. Without further documentation, the exact functionality of this endpoint remains unclear.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","pay-per-request","json-response","no-api-key"],"categories":["api-gateway","payments"],"synonyms":["x402 API","pay-per-call API","USDC micropayment API","lowpaymentfee","Base network API","crypto-paid API"],"warnings":["No documentation available — all doc/pricing/README pages show only 'Connect wallet' with no content","The specific functionality of /api/v1/charges/338 ('Premium API Access') is completely undocumented","No OpenAPI schema or request/response examples are provided","The endpoint title is generic and does not describe what data or service is returned"],"endpointUrl":"https://lowpaymentfee.com/api/v1/charges/338","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/338","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.300","qualityRationale":"The endpoint is live and returns a valid x402 challenge, but there is no documentation, no OpenAPI schema, no request/response examples, and the generic title 'Premium API Access' gives no indication of what the endpoint actually does. All doc pages resolve to a wallet-connect 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'0.02':10,24,82,140 '000':133 '20':132 '402':127 '6':144 'Base network API' 'USDC micropayment API' 'accept':163 'access':6,20,36,100,181 'actual':217 'address':158 'advertis':172 'ai':66 'analyt':65 'api':5,19,35,62,99,174 'application/json':168 'base':8,22,90,134,160 'base-network' 'beyond':219 'broader':170 'challeng':104,128 'charg':215 'collect':56 'confirm':118 'connect':193 'content':199 'crypto-paid API' 'data':64,111 'decim':145 'descript':210 'detail':107 'doc':185 'document':108,183,225 'endpoint':30,47,75,94,120,162,216,231 'equal':139 'exact':152,227 'exampl':207 'financ':69 'function':113,228 'gate':3,17 'generic':221 'given':141 'host':54 'howev':182 'infrastructur':72 'instant':180 'json-response' 'key':175 'label':97 'lack':106 'learn':68 'limit':178 'live':122 'lowpaymentfee' 'lowpaymentfee.com':32,51 'machin':67 'made':148 'mani':46 'maxamountrequir':130 'minim':192 'network':91 'no-api-key' 'offer':48 'one':44 'openapi':203 'page':184 'particular':214 'pay':9,23,59 'pay-per-call API' 'pay-per-request':58 'payment':40,146 'per':11,25,60,83 'platform':52,78,171 'post':164 'premium':4,18,34,98 'price':80,186 'probe':117 'prompt':195 'protocol':41 'provid':33 'rate':177 'readm':187 'remain':232 'request':12,26,61,84,165 'request/response':206 'resolv':189 'return':115,123,167 'schema':204 'scheme':153 'settl':85 'span':63 'specif':93 'specifi':156 'substant':198 'titl':222 'unclear':233 'unit':135 'usdc':14,28,87,137,142 'usdc-settlement' 'util':73 'valid':125 'via':37,149 'wallet':157,194 'web3':70 'without':223 'x402':2,16,39,103,126,151 'x402 API' 'x402-gated':1,15 'x402-payment'","prices":[{"id":"164cb360-2774-4e5f-8d22-59e9ed4b47dc","listingId":"20c207ac-7643-4759-a86d-482f045f7f71","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/338","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:45:06.676Z"}],"sources":[{"listingId":"20c207ac-7643-4759-a86d-482f045f7f71","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/charges/338","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:45:06.676Z","lastSeenAt":"2026-04-24T00:31:57.095Z"}],"details":{"listingId":"20c207ac-7643-4759-a86d-482f045f7f71","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/charges/338 \\\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 valid x402 challenge with maxAmountRequired of 20000 base units of USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/charges/338"},{"claim":"All endpoints on the platform are priced at $0.02 per request with no API keys, no rate limits, and instant access","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 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base network","source_url":"https://lowpaymentfee.com/api/v1/charges/338"}],"useCases":["Accessing premium API functionality with per-request USDC micropayments","Agent-driven API consumption without pre-registration or API keys","Programmatic pay-as-you-go access to web services on Base"],"bestFor":["Developers wanting key-free, pay-per-request API access","AI agents that can settle x402 payments in USDC on Base","Users who prefer crypto micropayments over subscription billing"],"notFor":["Users needing detailed API documentation or guaranteed SLAs","Applications requiring free or fiat-only payment methods","Use cases where the specific endpoint behavior must be well-documented before integration"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:22.482Z"},"updatedAt":"2026-04-24T00:31:57.095Z"}}