{"id":"33102cf4-8069-488b-a23b-e5552375700a","shortId":"7Btx55","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, rate limits, or commitments required.\n\nThe specific endpoint `/api/v1/payments/377` is listed under the title \"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 (0.02 USD, since USDC uses 6 decimals) to wallet address `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 further 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 deployment of x402-gated microservices. Without knowing what data or computation this particular endpoint returns, agents should treat it as exploratory.","tags":[],"capabilities":["x402-payment","usdc-base","pay-per-request","json-response","no-api-key","post-method"],"categories":["payments","api-gateway"],"synonyms":["x402 api","micropayment api","pay-per-call","usdc api","base network api","lowpaymentfee","premium api"],"warnings":["No documentation available — docs, API, pricing, and README pages all show only 'Connect wallet'","No OpenAPI or schema describing what this endpoint actually does or what inputs it expects","The label 'Premium API Access' is generic and does not describe a specific capability","No request body schema or response schema available — agents cannot predict behavior"],"endpointUrl":"https://lowpaymentfee.com/api/v1/payments/377","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/377","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 spec, no request/response schema, and no examples. The exact functionality behind 'Premium API Access' is unknown. This is effectively a stub 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'/request':13,28 '0.02':12,27,81,144 '000':139 '0x1a2b':154 '20':138 '6':149 '85f3':155 'accept':129 'access':7,22,38,111 'address':153 'agent':229 'ai':68 'analyt':67 'api':6,21,37,64,93,110,173 'appear':204 'application/json':163 'avail':201 'base':9,24,89,140,157 'base network api' 'beyond':119 'call':4,19 'catalog':58 'challeng':124 'commit':98 'comput':224 'confirm':125 'connect':182 'content':188 'data':66,222 'decim':150 'demonstr':208 'deploy':213 'doc':172 'document':118,164 'earli':211 'early-stag':210 'endpoint':32,49,77,102,227 'exact':114 'exampl':200 'exploratori':234 'extrem':169 'financ':71 'function':115 'gate':217 'host':56 'infrastructur':74 'json-response' 'key':94 'know':220 'label':121 'learn':70 'limit':96 'list':105 'live':128 'lowpaymentfee' 'lowpaymentfee.com':34,53 'machin':69 'mani':48 'micropayment api' 'microservic':218 'mime':160 'network':90 'no-api-key' 'offer':50 'one':46 'openapi':192 'page':177 'particular':226 'pay':2,17,61 'pay-per-cal':1,16 'pay-per-call' 'pay-per-request':60 'payment':42,134 'per':3,18,62,82 'platform':54,203 'post':130 'post-method' 'premium':5,20,36,109 'premium api' 'price':79,174 'prompt':184 'protocol':43 'provid':35 'rate':95 'readm':176 'render':179 'request':63,83,131 'request/response':195 'requir':99,133 'respons':159 'return':228 'schema':196 'settl':84 'sinc':146 'site':167 'span':65 'spars':170 'spec':193 'specif':101 'stage':212 'titl':108 'treat':231 'type':161 'unit':141 'usag':199 'usd':145 'usdc':15,30,86,143,147 'usdc api' 'usdc-base' 'use':148 'util':75 'via':10,25,39 'wallet':152,183 'web3':72 'without':219 'x402':11,26,41,123,216 'x402 api' 'x402-gated':215 'x402-payment'","prices":[{"id":"e8c55ab3-1984-4e14-95c4-f63657257eb6","listingId":"33102cf4-8069-488b-a23b-e5552375700a","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/377","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:50:38.660Z"}],"sources":[{"listingId":"33102cf4-8069-488b-a23b-e5552375700a","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/payments/377","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:50:38.660Z","lastSeenAt":"2026-04-23T11:03:35.395Z"}],"details":{"listingId":"33102cf4-8069-488b-a23b-e5552375700a","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/payments/377 \\\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":"Endpoint returns HTTP 402 with x402 challenge requiring USDC payment on Base","source_url":"https://lowpaymentfee.com/api/v1/payments/377"},{"claim":"Platform lists APIs at $0.02/request with no API keys, no rate limits, instant access on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"maxAmountRequired is 20000 base units of USDC (USD Coin, 6 decimals) = $0.02","source_url":"https://lowpaymentfee.com/api/v1/payments/377"},{"claim":"Docs, API, pricing, and README pages render only 'Connect wallet' with no content","source_url":"https://lowpaymentfee.com/docs"}],"useCases":["Testing x402 payment protocol integration with a low-cost endpoint","Exploring pay-per-request API patterns without API key management","Demonstrating USDC micropayments on Base network"],"bestFor":["Developers experimenting with x402 protocol","Agents needing a cheap test endpoint for payment flow validation","Projects wanting keyless, pay-as-you-go API access"],"notFor":["Production workloads requiring documented request/response schemas","Users who need detailed API documentation before integrating","Anyone needing non-crypto payment options"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:06.548Z"},"updatedAt":"2026-04-23T11:03:35.395Z"}}