{"id":"80eb7263-bc96-481e-b5ba-6c71c3013d5d","shortId":"YG7Ap5","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 catalog 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 minimum commitments required.\n\nThe specific endpoint `/api/v1/payments/162` is labeled \"Premium API Access\" but its exact functionality is not documented beyond that title. The x402 challenge confirms it is live, accepts POST requests, and requires payment of up to 20,000 base units of USDC (0.02 USD, since USDC uses 6 decimals) to wallet `0x1A2B...85F3` on Base. The response MIME type is `application/json`.\n\nDocumentation on the site is extremely sparse — the docs, API, pricing, and README pages all render only a \"Connect wallet\" prompt with no additional content. There is no OpenAPI spec, no request/response schema, and no usage examples available. The platform appears to be a demonstration or early-stage x402 marketplace. Without knowing what data or service this particular endpoint returns, consumers should treat it as exploratory.","tags":[],"capabilities":["x402-payment","usdc-base","pay-per-request","json-response","no-api-key","post-method"],"categories":["payments","general"],"synonyms":["x402 API","pay-per-call API","USDC micropayment endpoint","Base network API","lowpaymentfee","crypto-paid API","402 payment protocol"],"warnings":["No documentation available — docs, API, pricing, and README pages all show only 'Connect wallet'","No OpenAPI or request/response schema provided for this endpoint","The exact functionality of /api/v1/payments/162 ('Premium API Access') is unknown","The platform appears to be early-stage or a demonstration; reliability is unverified"],"endpointUrl":"https://lowpaymentfee.com/api/v1/payments/162","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/162","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.250","qualityRationale":"The endpoint is live and returns a valid x402 challenge, but there is no documentation, no OpenAPI spec, no request/response schema, and no examples. The endpoint's actual functionality behind 'Premium API Access' is completely undocumented. Docs pages render only 'Connect wallet' with no 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'/request':13,28 '0.02':12,27,81,144 '000':139 '0x1a2b':153 '20':138 '402 payment protocol' '6':149 '85f3':154 'Base network API' 'USDC micropayment endpoint' 'accept':129 'access':7,22,38,111 'addit':186 'ai':68 'analyt':67 'api':6,21,37,64,93,110,172 'appear':203 'application/json':162 'avail':200 'base':9,24,89,140,156 'beyond':119 'call':4,19 'catalog':58 'challeng':124 'commit':101 'confirm':125 'connect':181 'consum':224 'content':187 'crypto-paid API' 'data':66,217 'decim':150 'demonstr':207 'doc':171 'document':118,163 'earli':210 'early-stag':209 'endpoint':32,49,77,105,222 'exact':114 'exampl':199 'exploratori':229 'extrem':168 'financ':71 'function':115 'host':56 'infrastructur':74 'json-response' 'key':94 'know':215 'label':108 'learn':70 'limit':97 'live':128 'lowpaymentfee' 'lowpaymentfee.com':34,53 'machin':69 'mani':48 'marketplac':213 'mime':159 'minimum':100 'network':90 'no-api-key' 'offer':50 'one':46 'openapi':191 'page':176 'particular':221 'pay':2,17,61 'pay-per-cal':1,16 'pay-per-call API' 'pay-per-request':60 'payment':42,134 'per':3,18,62,82 'platform':54,202 'post':130 'post-method' 'premium':5,20,36,109 'price':79,173 'prompt':183 'protocol':43 'provid':35 'rate':96 'readm':175 'render':178 'request':63,83,131 'request/response':194 'requir':102,133 'respons':158 'return':223 'schema':195 'servic':219 'settl':84 'sinc':146 'site':166 'span':65 'spars':169 'spec':192 'specif':104 'stage':211 'titl':121 'treat':226 'type':160 'unit':141 'usag':198 'usd':145 'usdc':15,30,86,143,147 'usdc-base' 'use':148 'util':75 'via':10,25,39 'wallet':152,182 'web3':72 'without':214 'x402':11,26,41,123,212 'x402 API' 'x402-payment'","prices":[{"id":"5a542054-1873-4e5f-b162-5a006e048266","listingId":"80eb7263-bc96-481e-b5ba-6c71c3013d5d","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/162","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:49:42.404Z"}],"sources":[{"listingId":"80eb7263-bc96-481e-b5ba-6c71c3013d5d","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/payments/162","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:49:42.404Z","lastSeenAt":"2026-04-22T09:01:16.156Z"}],"details":{"listingId":"80eb7263-bc96-481e-b5ba-6c71c3013d5d","quickStartSnippet":"# The endpoint requires an X-PAYMENT header with a valid x402 payment proof.\n# Using curl to see the 402 challenge:\ncurl -X POST https://lowpaymentfee.com/api/v1/payments/162 \\\n  -H 'Content-Type: application/json'\n# Returns 402 with x402 payment challenge. Use an x402 client library to\n# construct and attach the payment header automatically.","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","source_url":"https://lowpaymentfee.com/api/v1/payments/162"},{"claim":"All endpoints priced at $0.02/request with no API keys, no rate limits, instant access on Base network","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 contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/payments/162"}],"useCases":["Exploring x402 payment protocol integration in agent workflows","Testing pay-per-request API consumption without API key management","Prototyping micropayment-gated service access on Base"],"bestFor":["Developers experimenting with x402 payment flows","Agents that need keyless, pay-as-you-go API access","Projects already using USDC on Base network"],"notFor":["Production workloads requiring documented request/response schemas","Users who need free or fiat-only payment options","Anyone needing detailed API documentation before integration"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:09.124Z"},"updatedAt":"2026-04-22T09:01:16.156Z"}}