{"id":"4a5855dd-ce20-47ec-b842-fae25796740b","shortId":"BuGq2B","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 commitments required.\n\nThe specific endpoint `/api/v1/payments/181` is labeled \"Premium API Access\" in the x402 challenge but its exact functionality is not documented beyond that label. The x402 challenge confirms it is live, accepts POST requests, and requires a payment of up to 20,000 base units of USDC (0.02 USD, since USDC uses 6 decimals) to the address `0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3`. 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 schema, no request/response examples, and no detailed description of what this particular endpoint returns. The platform appears to be a demonstration or early-stage x402 API marketplace. Users should be aware that the actual payload and behavior of this endpoint are undocumented.","tags":[],"capabilities":["x402-payment","usdc-base-network","pay-per-request","json-response","no-api-key","post-method"],"categories":["payments","api-marketplace"],"synonyms":["x402 API","pay-per-call API","USDC micropayment API","Base network API","lowpaymentfee","premium API access","crypto-paid API"],"warnings":["Endpoint functionality is undocumented — 'Premium API Access' is the only description available","All documentation pages (docs, API, pricing, README) render only 'Connect wallet' with no content","No OpenAPI schema or request/response examples available","Actual behavior and return data of /api/v1/payments/181 are unknown"],"endpointUrl":"https://lowpaymentfee.com/api/v1/payments/181","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/181","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 schema, no request/response examples, and the endpoint's actual functionality beyond its label is unknown. Docs pages are empty. This is effectively a stub 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'/request':13,28 '0.02':12,27,81,148 '000':143 '0x1a2b13e97f5f837c8f9fa1f95a1484b7c70d85f3':158 '20':142 '6':153 'Base network API' 'USDC micropayment API' 'accept':132 'access':7,22,38,110 'actual':228 'addit':188 'address':157 'ai':68 'analyt':67 'api':6,21,37,64,93,109,174,220 'appear':210 'application/json':164 'awar':225 'base':9,24,89,144 'behavior':231 'beyond':122 'call':4,19 'catalog':58 'challeng':114,127 'commit':100 'confirm':128 'connect':183 'content':189 'crypto-paid API' 'data':66 'decim':154 'demonstr':214 'descript':201 'detail':200 'doc':173 'document':121,165 'earli':217 'early-stag':216 'endpoint':32,49,77,104,206,234 'exact':117 'exampl':197 'extrem':170 'financ':71 'function':118 'host':56 'infrastructur':74 'json-response' 'key':94 'label':107,124 'learn':70 'limit':97 'live':131 'lowpaymentfee' 'lowpaymentfee.com':34,53 'machin':69 'mani':48 'marketplac':221 'mime':161 'network':90 'no-api-key' 'offer':50 'one':46 'openapi':193 'page':178 'particular':205 'pay':2,17,61 'pay-per-cal':1,16 'pay-per-call API' 'pay-per-request':60 'payload':229 'payment':42,138 'per':3,18,62,82 'platform':54,209 'post':133 'post-method' 'premium':5,20,36,108 'premium API access' 'price':79,175 'prompt':185 'protocol':43 'provid':35 'rate':96 'readm':177 'render':180 'request':63,83,134 'request/response':196 'requir':101,136 'respons':160 'return':207 'schema':194 'settl':84 'sinc':150 'site':168 'span':65 'spars':171 'specif':103 'stage':218 'type':162 'undocu':236 'unit':145 'usd':149 'usdc':15,30,86,147,151 'usdc-base-network' 'use':152 'user':222 'util':75 'via':10,25,39 'wallet':184 'web3':72 'x402':11,26,41,113,126,219 'x402 API' 'x402-payment'","prices":[{"id":"fe489001-feca-438c-8e24-4e4925c1bb99","listingId":"4a5855dd-ce20-47ec-b842-fae25796740b","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/181","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:49:44.994Z"}],"sources":[{"listingId":"4a5855dd-ce20-47ec-b842-fae25796740b","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/payments/181","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:49:44.994Z","lastSeenAt":"2026-04-22T23:01:41.986Z"}],"details":{"listingId":"4a5855dd-ce20-47ec-b842-fae25796740b","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/payments/181 \\\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 x402 challenge with maxAmountRequired of 20000 base units of USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/payments/181"},{"claim":"All endpoints 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":"The platform offers APIs across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset address is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 (Base network USDC)","source_url":"https://lowpaymentfee.com/api/v1/payments/181"}],"useCases":["Testing x402 payment protocol integrations","Accessing pay-per-request API services without API key management","Demonstrating USDC micropayments on Base network"],"bestFor":["Developers experimenting with x402 payment flows","Agents that need keyless, pay-per-call API access","Projects requiring USDC-settled micropayment APIs on Base"],"notFor":["Production workloads requiring documented, stable API contracts","Users who need detailed request/response schemas before integrating","Anyone without a Base-network USDC wallet"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:09.053Z"},"updatedAt":"2026-04-22T23:01:41.986Z"}}