{"id":"15829548-6c99-4196-abfe-56d9d4fd4013","shortId":"eLPMYq","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 broad catalog 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, payable in USDC on the Base network with no API keys, rate limits, or commitments required.\n\nThe specific endpoint `/api/v1/payments/203` is labeled \"Premium API Access\" but its exact functionality is not documented beyond that label. The x402 challenge confirms it is live, accepts POST requests, and requires payment 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 x402 exact scheme with a 300-second timeout. The response MIME type is application/json.\n\nThe platform's documentation pages (/docs, /pricing, /api, /README) all resolve but contain no substantive content beyond a \"Connect wallet\" prompt, so details about request/response schemas, authentication beyond x402, or the specific data returned by this endpoint are unavailable. The platform appears to be a demonstration or early-stage x402 API marketplace. Users should be aware that the actual payload and utility of this particular endpoint are unspecified.","tags":[],"capabilities":["x402-payment","usdc-base","pay-per-request","json-response","no-api-key","post-method"],"categories":["api-marketplace","payments"],"synonyms":["lowpaymentfee","low payment fee API","x402 premium API","pay-per-call API","USDC micropayment API","Base network API"],"warnings":["Endpoint functionality is undocumented — 'Premium API Access' is the only description available","All documentation pages (/docs, /pricing, /api, /README) return only a 'Connect wallet' prompt with no content","No request or response schema is available; callers cannot know what to send or what they will receive","This may be a demo/test platform rather than a production service"],"endpointUrl":"https://lowpaymentfee.com/api/v1/payments/203","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/payments/203","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 endpoint's actual functionality beyond the label 'Premium API Access' is completely unspecified. Docs pages are empty 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'/api/v1/payments/203':107 '/docs':181 '/pricing':182 '/readme':184 '/request':13,28 '0.02':12,27,85,151 '000':140 '0x8335':145 '20':139 '2913':146 '300':167 '6':155 'Base network API' 'USDC micropayment API' 'accept':130 'access':7,22,38,112 'actual':235 'ai':69 'analyt':68 'api':6,21,37,65,97,111,227 'appear':217 'application/json':175 'authent':202 'awar':232 'base':9,24,93,141,148 'beyond':120,192,203 'broad':58 'call':4,19 'catalog':59 'challeng':125 'commit':102 'confirm':126 'connect':194 'contain':188 'content':191 'data':67,208 'decim':156 'demonstr':221 'detail':198 'document':119,179 'earli':224 'early-stag':223 'endpoint':32,49,78,106,212,242 'equal':150 'exact':115,163 'financ':72 'function':116 'given':152 'host':56 'infrastructur':75 'json-response' 'key':98 'label':109,122 'learn':71 'limit':100 'live':129 'low payment fee API' 'lowpaymentfee' 'lowpaymentfee.com':34,53 'machin':70 'made':159 'mani':48 'marketplac':228 'mime':172 'network':94 'no-api-key' 'offer':50 'one':46 'page':180 'particular':241 'pay':2,17,62 'pay-per-cal':1,16 'pay-per-call API' 'pay-per-request':61 'payabl':88 'payload':236 'payment':42,135,157 'per':3,18,63,86 'platform':54,81,177,216 'post':131 'post-method' 'premium':5,20,36,110 'price':83 'prompt':196 'protocol':43 'provid':35 'rate':99 'request':64,87,132 'request/response':200 'requir':103,134 'resolv':186 'respons':171 'return':209 'schema':201 'scheme':164 'second':168 'span':66 'specif':105,207 'stage':225 'substant':190 'timeout':169 'type':173 'unavail':214 'unit':142 'unspecifi':244 'usdc':15,30,90,144,153 'usdc-base' 'user':229 'util':76,238 'via':10,25,39,160 'wallet':195 'web3':73 'x402':11,26,41,124,162,204,226 'x402 premium API' 'x402-payment'","prices":[{"id":"070dc01c-24e2-4d0c-ba8e-cca0c0a90c09","listingId":"15829548-6c99-4196-abfe-56d9d4fd4013","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/payments/203","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:49:51.018Z"}],"sources":[{"listingId":"15829548-6c99-4196-abfe-56d9d4fd4013","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/payments/203","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:49:51.018Z","lastSeenAt":"2026-04-22T23:01:42.261Z"}],"details":{"listingId":"15829548-6c99-4196-abfe-56d9d4fd4013","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/payments/203 \\\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 platform lists all endpoints at $0.02 per request with no API keys, rate limits, or commitments","source_url":"https://lowpaymentfee.com"},{"claim":"The x402 challenge shows maxAmountRequired of 20000 base units of USDC on Base (asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913)","source_url":"https://lowpaymentfee.com/api/v1/payments/203"},{"claim":"Documentation pages resolve but contain only 'Connect wallet' with no substantive content","source_url":"https://lowpaymentfee.com/docs"}],"useCases":["Testing x402 payment protocol integrations against a live endpoint","Exploring pay-per-request API patterns without API key management","Demonstrating USDC micropayments on Base for API access"],"bestFor":["Developers experimenting with x402 payment flows","Agents that need keyless, pay-per-call API access on Base","Prototyping micropayment-gated API services"],"notFor":["Production workloads requiring well-documented request/response schemas","Users who need free or subscription-based API access","Anyone needing detailed documentation on what the endpoint actually returns"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:08.778Z"},"updatedAt":"2026-04-22T23:01:42.261Z"}}