{"id":"c41b180e-11fc-4228-83ce-5fefd9a70020","shortId":"cHZJ6j","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. The site hosts a collection of pay-per-request APIs spanning data & analytics, AI/ML inference, finance & Web3 data, and infrastructure utilities, all priced at $0.02 per request and settled in USDC on the Base network.\n\nThe specific endpoint `/api/v1/charges/136` is labeled \"Premium API Access\" in the x402 challenge. It accepts POST requests and returns application/json. The x402 challenge advertises a maxAmountRequired of 20,000 base units of USDC (0x8335…2913 on Base), which equals $0.02 given USDC's 6 decimals. Payment is made via the x402 \"exact\" scheme with a 300-second timeout. No API keys or rate limits are advertised — access is gated purely by per-call USDC micropayment.\n\nDocumentation is extremely sparse. The docs, pricing, API, and README pages all render only a \"Connect wallet\" prompt with no additional content. There is no OpenAPI spec, no request/response schema documentation, and no examples of what this particular endpoint actually returns. The site lists many other endpoints (analytics, AI, finance, utilities) but does not clarify what `/api/v1/charges/136` specifically provides versus those named endpoints. Prospective users should be aware that the actual functionality behind this endpoint is undocumented.","tags":[],"capabilities":["x402-payment","usdc-micropayment","base-network","pay-per-request","json-response","no-api-key"],"categories":["api-gateway","payments"],"synonyms":["lowpaymentfee","x402 api","micropayment api","pay per call api","USDC api access","base network api","low fee api"],"warnings":["No documentation available — docs, pricing, API, and README pages all show only 'Connect wallet'","No OpenAPI or schema describing request parameters or response format","The specific functionality of /api/v1/charges/136 ('Premium API Access') is undefined — it is not listed among the named endpoints on the homepage","Cannot verify what data or service is actually returned after payment"],"endpointUrl":"https://lowpaymentfee.com/api/v1/charges/136","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/136","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 OpenAPI spec, no request/response examples, and no clarity on what 'Premium API Access' actually returns. The docs pages are empty beyond a wallet-connect prompt. This is effectively a stub 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'/request':13,28 '0.02':12,27,69,119 '000':108 '0x8335':113 '20':107 '2913':114 '300':135 '6':123 'USDC api access' 'accept':94 'access':7,22,38,88,146 'actual':195,226 'addit':176 'advertis':103,145 'ai':204 'ai/ml':58 'analyt':57,203 'api':6,21,37,54,87,139,163 'application/json':99 'awar':223 'base':9,24,78,109,116 'base network api' 'base-network' 'behind':228 'call':4,19,153 'challeng':92,102 'clarifi':210 'collect':48 'connect':171 'content':177 'data':56,62 'decim':124 'doc':161 'document':156,186 'endpoint':32,82,194,202,218,230 'equal':118 'exact':131 'exampl':189 'extrem':158 'financ':60,205 'function':227 'gate':148 'given':120 'host':46 'infer':59 'infrastructur':64 'json-response' 'key':140 'label':85 'limit':143 'list':199 'low fee api' 'lowpaymentfee' 'lowpaymentfee.com':34 'made':127 'mani':200 'maxamountrequir':105 'micropay':155 'micropayment api' 'name':217 'network':79 'no-api-key' 'openapi':181 'page':166 'particular':193 'pay':2,17,51 'pay per call api' 'pay-per-cal':1,16 'pay-per-request':50 'payment':42,125 'per':3,18,52,70,152 'per-cal':151 'post':95 'premium':5,20,36,86 'price':67,162 'prompt':173 'prospect':219 'protocol':43 'provid':35,214 'pure':149 'rate':142 'readm':165 'render':168 'request':53,71,96 'request/response':184 'return':98,196 'schema':185 'scheme':132 'second':136 'settl':73 'site':45,198 'span':55 'spars':159 'spec':182 'specif':81,213 'timeout':137 'undocu':232 'unit':110 'usdc':15,30,75,112,121,154 'usdc-micropayment' 'user':220 'util':65,206 'versus':215 'via':10,25,39,128 'wallet':172 'web3':61 'x402':11,26,41,91,101,130 'x402 api' 'x402-payment'","prices":[{"id":"5a033597-c526-4372-a0fd-e613562d365c","listingId":"c41b180e-11fc-4228-83ce-5fefd9a70020","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/136","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:44:12.779Z"}],"sources":[{"listingId":"c41b180e-11fc-4228-83ce-5fefd9a70020","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/charges/136","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:44:12.779Z","lastSeenAt":"2026-04-24T05:02:30.872Z"}],"details":{"listingId":"c41b180e-11fc-4228-83ce-5fefd9a70020","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/charges/136 \\\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 challenge with maxAmountRequired of 20000 base units of USDC on Base network","source_url":"https://lowpaymentfee.com/api/v1/charges/136"},{"claim":"All listed APIs 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":"USDC asset contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/charges/136"}],"useCases":["Agent-initiated API calls paid per-request without pre-registration or API keys","Programmatic access to premium data or services settled in USDC on Base","Testing x402 payment protocol integrations with a low-cost endpoint"],"bestFor":["Developers exploring x402 micropayment-gated APIs","AI agents that need keyless, pay-as-you-go API access","Users who want to avoid subscriptions and pay only per call"],"notFor":["Users who need detailed API documentation or guaranteed SLAs","Anyone without a Base-network USDC wallet","High-volume consumers who would benefit from bulk pricing"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:25.044Z"},"updatedAt":"2026-04-24T05:02:30.872Z"}}