{"id":"a65d79f5-fcdf-4cc6-9281-03c4a981c449","shortId":"EgtdFL","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 platform, which spans data & analytics, AI & machine learning, finance & Web3, and infrastructure utility services — all priced at $0.02 per request settled in USDC on the Base network.\n\nThe specific endpoint `/api/v1/charges/341` accepts POST requests and requires an X-PAYMENT header containing a valid x402 payment proof. The challenge advertises a maxAmountRequired of 20,000 base units of USDC (0x8335…2913 on Base), which equals $0.02 given USDC's 6 decimals. There are no API keys, no rate limits, and no subscription commitments — each call is independently paid.\n\nDocumentation is extremely sparse. The crawled docs, pricing, and API pages all render only a \"Connect wallet\" prompt with no further technical detail. There is no OpenAPI spec, no request/response schema beyond the x402 outputSchema stub, and no description of what \"Premium API Access\" actually returns. The platform appears to be a demonstration or early-stage x402 marketplace rather than a fully documented production service.","tags":[],"capabilities":["x402-payment","usdc-base","pay-per-request","no-api-key","post-method"],"categories":["infrastructure","payments"],"synonyms":["x402 api","pay per call api","usdc api access","base network api","micropayment api","lowpaymentfee"],"warnings":["No documentation available — docs/pricing/API pages only show 'Connect wallet'","No OpenAPI or request/response schema provided","Purpose of 'Premium API Access' at /api/v1/charges/341 is undefined","Platform may be a demo or early-stage project"],"endpointUrl":"https://lowpaymentfee.com/api/v1/charges/341","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/341","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 captured) and pricing is clear ($0.02 USDC on Base), but there is no documentation, no request/response schema, and no explanation of what 'Premium API Access' actually delivers. Effectively a stub 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'/request':13,28 '0.02':12,27,70,118 '000':107 '0x8335':112 '20':106 '2913':113 '6':122 'accept':84 'access':7,22,38,184 'actual':185 'advertis':102 'ai':58 'analyt':57 'api':6,21,37,127,150,183 'appear':189 'base':9,24,78,108,115 'base network api' 'beyond':172 'call':4,19,137 'challeng':101 'commit':135 'connect':156 'contain':94 'crawl':146 'data':56 'decim':123 'demonstr':193 'descript':179 'detail':163 'doc':147 'document':141,204 'earli':196 'early-stag':195 'endpoint':32,49,82 'equal':117 'extrem':143 'financ':61 'fulli':203 'given':119 'header':93 'independ':139 'infrastructur':64 'key':128 'learn':60 'limit':131 'lowpaymentfee' 'lowpaymentfee.com':34 'machin':59 'mani':48 'marketplac':199 'maxamountrequir':104 'micropayment api' 'network':79 'no-api-key' 'offer':50 'one':46 'openapi':167 'outputschema':175 'page':151 'paid':140 'pay':2,17 'pay per call api' 'pay-per-cal':1,16 'pay-per-request' 'payment':42,92,98 'per':3,18,71 'platform':53,188 'post':85 'post-method' 'premium':5,20,36,182 'price':68,148 'product':205 'prompt':158 'proof':99 'protocol':43 'provid':35 'rate':130 'rather':200 'render':153 'request':72,86 'request/response':170 'requir':88 'return':186 'schema':171 'servic':66,206 'settl':73 'span':55 'spars':144 'spec':168 'specif':81 'stage':197 'stub':176 'subscript':134 'technic':162 'unit':109 'usdc':15,30,75,111,120 'usdc api access' 'usdc-base' 'util':65 'valid':96 'via':10,25,39 'wallet':157 'web3':62 'x':91 'x-payment':90 'x402':11,26,41,97,174,198 'x402 api' 'x402-payment'","prices":[{"id":"565a5114-e13c-4313-bbc0-9bb70cb94bbc","listingId":"a65d79f5-fcdf-4cc6-9281-03c4a981c449","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/341","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:45:15.116Z"}],"sources":[{"listingId":"a65d79f5-fcdf-4cc6-9281-03c4a981c449","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/charges/341","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:45:15.116Z","lastSeenAt":"2026-04-24T10:32:37.156Z"}],"details":{"listingId":"a65d79f5-fcdf-4cc6-9281-03c4a981c449","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/charges/341 \\\n  -H \"X-PAYMENT: <x402_payment_proof>\" \\\n  -H \"Content-Type: application/json\"","exampleRequest":null,"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"Endpoint returns 402 with x402 challenge advertising 20000 base units of USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/charges/341"},{"claim":"Platform advertises $0.02/request pricing with no API keys, no rate limits, 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/341"}],"useCases":["Demonstrating x402 payment protocol integration","Accessing pay-per-call services without API key management","Testing micropayment-gated endpoints on Base"],"bestFor":["Developers exploring x402 payment flows","Agents needing keyless, per-call API access","Projects wanting USDC-settled micropayments on Base"],"notFor":["Users needing detailed API documentation or schemas","Production workloads requiring SLA guarantees","Anyone without a Base-compatible USDC wallet"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:22.139Z"},"updatedAt":"2026-04-24T10:32:37.156Z"}}