{"id":"6abce428-4c14-4507-8652-fc0dcbb4d660","shortId":"V6uyum","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/117` is labeled \"Premium API Access\" in the x402 challenge but lacks further documentation about what data or functionality it returns. 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 spec, no request/response schema documentation, and no examples of what this specific endpoint returns. The platform's landing page lists many other endpoints but does not describe `/api/v1/payments/117` specifically. Prospective users should be aware that without documentation, the actual functionality of this endpoint is unclear.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","pay-per-request","json-response","no-api-key"],"categories":["payments","api-gateway"],"synonyms":["x402 API","pay-per-call API","USDC micropayment API","Base network API","lowpaymentfee","premium API access","crypto-paid API"],"warnings":["No documentation available — docs, API, pricing, and README pages all show only 'Connect wallet'","The specific functionality of /api/v1/payments/117 is undocumented and unclear","No OpenAPI spec or request/response schema provided","No examples of expected input or output"],"endpointUrl":"https://lowpaymentfee.com/api/v1/payments/117","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/117","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.300","qualityRationale":"The x402 challenge is live and confirms pricing and payment details, but there is zero documentation about what this specific endpoint actually does. No OpenAPI spec, no request/response schemas, no examples. The endpoint name 'Premium API Access' is generic and uninformative. Docs pages are empty beyond a wallet connect 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'/request':13,28 '0.02':12,27,81,149 '000':144 '0x1a2b13e97f5f837c8f9fa1f95a1484b7c70d85f3':159 '20':143 '6':154 'Base network API' 'USDC micropayment API' 'accept':133 'access':7,22,38,110 'actual':233 'addit':189 'address':158 'ai':68 'analyt':67 'api':6,21,37,64,93,109,175 'application/json':165 'awar':228 'base':9,24,89,145 'base-network' 'call':4,19 'catalog':58 'challeng':114,128 'commit':100 'confirm':129 'connect':184 'content':190 'crypto-paid API' 'data':66,121 'decim':155 'describ':221 'doc':174 'document':118,166,199,231 'endpoint':32,49,77,104,207,217,237 'exampl':202 'extrem':171 'financ':71 'function':123,234 'host':56 'infrastructur':74 'json-response' 'key':94 'label':107 'lack':116 'land':212 'learn':70 'limit':97 'list':214 'live':132 'lowpaymentfee' 'lowpaymentfee.com':34,53 'machin':69 'mani':48,215 'mime':162 'network':90 'no-api-key' 'offer':50 'one':46 'openapi':194 'page':179,213 'pay':2,17,61 'pay-per-cal':1,16 'pay-per-call API' 'pay-per-request':60 'payment':42,139 'per':3,18,62,82 'platform':54,210 'post':134 'premium':5,20,36,108 'premium API access' 'price':79,176 'prompt':186 'prospect':224 'protocol':43 'provid':35 'rate':96 'readm':178 'render':181 'request':63,83,135 'request/response':197 'requir':101,137 'respons':161 'return':125,208 'schema':198 'settl':84 'sinc':151 'site':169 'span':65 'spars':172 'spec':195 'specif':103,206,223 'type':163 'unclear':239 'unit':146 'usd':150 'usdc':15,30,86,148,152 'usdc-settlement' 'use':153 'user':225 'util':75 'via':10,25,39 'wallet':185 'web3':72 'without':230 'x402':11,26,41,113,127 'x402 API' 'x402-payment'","prices":[{"id":"6cced671-f8ba-4a29-a8d8-90f2e2849847","listingId":"6abce428-4c14-4507-8652-fc0dcbb4d660","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/117","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:49:25.144Z"}],"sources":[{"listingId":"6abce428-4c14-4507-8652-fc0dcbb4d660","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/payments/117","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:49:25.144Z","lastSeenAt":"2026-04-23T19:01:17.294Z"}],"details":{"listingId":"6abce428-4c14-4507-8652-fc0dcbb4d660","quickStartSnippet":"# The endpoint requires an X-PAYMENT header with a valid x402 payment proof.\n# Using curl as a conceptual example (actual payment header must be constructed\n# by an x402-compatible client):\ncurl -X POST https://lowpaymentfee.com/api/v1/payments/117 \\\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 402 with x402 challenge requiring up to 20,000 base units of USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/payments/117"},{"claim":"Platform lists APIs at $0.02/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: 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/payments/117"},{"claim":"Docs, API, pricing, and README pages render only 'Connect wallet' with no additional content","source_url":"https://lowpaymentfee.com/docs"}],"useCases":["Accessing premium API functionality with per-request USDC micropayments","Agent-driven API consumption without pre-registration or API keys","Programmatic pay-as-you-go access to services on Base L2"],"bestFor":["Developers wanting keyless, pay-per-use API access","AI agents with x402-compatible payment capabilities","Users who prefer crypto micropayments over subscription billing"],"notFor":["Users who need detailed API documentation before integrating","Applications requiring guaranteed SLAs or support contracts","Users without USDC on the Base network"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:09.983Z"},"updatedAt":"2026-04-23T19:01:17.294Z"}}