{"id":"c42558a9-aeff-40d5-ac28-1fd0cd7d7263","shortId":"Rkyfcg","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/187` 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 further content. There is no OpenAPI schema, no request/response examples, and no detailed description of what this particular endpoint returns. The platform's landing page lists sibling endpoints for analytics, AI inference, finance data, and utilities, all at the same $0.02 price point, but the `/api/v1/payments/187` endpoint does not appear in that catalog. Users should be aware that the actual behavior of this endpoint is unclear from available documentation.","tags":[],"capabilities":["x402-payment","usdc-base-network","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","premium API","crypto-paid API"],"warnings":["The exact functionality of /api/v1/payments/187 is not documented — 'Premium API Access' is the only label provided.","No OpenAPI schema, request format, or response examples are available.","All documentation pages (docs, API, pricing, README) render only 'Connect wallet' with no content.","This endpoint does not appear in the platform's own catalog of available APIs on the landing page."],"endpointUrl":"https://lowpaymentfee.com/api/v1/payments/187","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/187","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, confirming pricing and payment details. However, there is no documentation, no OpenAPI schema, no request/response examples, and the specific functionality of /api/v1/payments/187 is entirely undocumented. The docs pages are empty beyond a wallet connect prompt. This is effectively a stub 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'/request':13,28 '0.02':12,27,81,148,228 '000':143 '0x1a2b13e97f5f837c8f9fa1f95a1484b7c70d85f3':158 '20':142 '6':153 'Base network API' 'USDC micropayment endpoint' 'accept':132 'access':7,22,38,110 'actual':247 'address':157 'ai':68,218 'analyt':67,217 'api':6,21,37,64,93,109,174 'appear':237 'application/json':164 'avail':255 'awar':244 'base':9,24,89,144 'behavior':248 'beyond':122 'call':4,19 'catalog':58,240 'challeng':114,127 'commit':100 'confirm':128 'connect':183 'content':189 'crypto-paid API' 'data':66,221 'decim':154 'descript':201 'detail':200 'doc':173 'document':121,165,256 'endpoint':32,49,77,104,206,215,234,251 'exact':117 'exampl':197 'extrem':170 'financ':71,220 'function':118 'host':56 'infer':219 'infrastructur':74 'json-response' 'key':94 'label':107,124 'land':211 'learn':70 'limit':97 'list':213 'live':131 'lowpaymentfee' 'lowpaymentfee.com':34,53 'machin':69 'mani':48 'mime':161 'network':90 'no-api-key' 'offer':50 'one':46 'openapi':193 'page':178,212 'particular':205 'pay':2,17,61 'pay-per-cal':1,16 'pay-per-call API' 'pay-per-request':60 'payment':42,138 'per':3,18,62,82 'platform':54,209 'point':230 'post':133 'post-method' 'premium':5,20,36,108 'premium API' 'price':79,175,229 '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 'sibl':214 'sinc':150 'site':168 'span':65 'spars':171 'specif':103 'type':162 'unclear':253 'unit':145 'usd':149 'usdc':15,30,86,147,151 'usdc-base-network' 'use':152 'user':241 'util':75,223 'via':10,25,39 'wallet':184 'web3':72 'x402':11,26,41,113,126 'x402 API' 'x402-payment'","prices":[{"id":"b20be246-7550-4613-a282-744c51914d54","listingId":"c42558a9-aeff-40d5-ac28-1fd0cd7d7263","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/187","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:49:56.586Z"}],"sources":[{"listingId":"c42558a9-aeff-40d5-ac28-1fd0cd7d7263","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/payments/187","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:49:56.586Z","lastSeenAt":"2026-04-22T07:01:08.332Z"}],"details":{"listingId":"c42558a9-aeff-40d5-ac28-1fd0cd7d7263","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/payments/187 \\\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/187"},{"claim":"All endpoints on the platform 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":"USDC asset address 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base network","source_url":"https://lowpaymentfee.com/api/v1/payments/187"},{"claim":"The platform offers APIs across data & analytics, AI & ML, finance & Web3, and infrastructure categories","source_url":"https://lowpaymentfee.com"}],"useCases":["Accessing a premium API resource with per-call USDC micropayments on Base","Demonstrating x402 payment protocol integration for agent-purchasable endpoints","Testing low-cost pay-per-request API patterns without API key management"],"bestFor":["Developers exploring x402 payment protocol integrations","Agents needing keyless, pay-per-call API access on Base","Users wanting low-friction micropayment-gated endpoints"],"notFor":["Users who need detailed API documentation or guaranteed SLAs","Applications requiring free or subscription-based access patterns","Use cases needing high-throughput batch processing (no documented rate limits but no guarantees either)"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:08.477Z"},"updatedAt":"2026-04-22T07:01:08.332Z"}}