{"id":"b07a6f9b-44f7-4092-8942-72844f2e1f45","shortId":"JkBfwB","kind":"x402","title":"Pay-per-call premium API access on Base via x402, settled in USDC at $0.02/request.","tagline":"Pay-per-call premium API access on Base via x402, settled in USDC at $0.02/request.","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 collection of pay-per-request APIs spanning data & analytics, AI & machine learning, finance & Web3, and infrastructure utilities. All endpoints on the platform share a uniform $0.02-per-request pricing model, payable in USDC on the Base network with no API keys, rate limits, or commitments required.\n\nThe specific endpoint `/api/v1/payments/118` is labeled \"Premium API Access\" in the x402 challenge. The challenge confirms it accepts POST requests, settles in USDC (contract 0x8335…2913 on Base), and requires a maximum of 20,000 base units (i.e., $0.02 given USDC's 6 decimals). The payment timeout is 300 seconds. However, the exact functionality behind this particular endpoint path is not documented beyond its title — the platform's landing page lists other specific APIs (metrics, reports, sentiment analysis, summarization, etc.) but does not describe `/api/v1/payments/118` in detail.\n\nNo OpenAPI schema, detailed documentation, or example request/response payloads were found in the crawl. The docs, API, pricing, and README pages all returned only a \"Connect wallet\" prompt with no substantive content. Because of this, the actual input parameters and response format for this endpoint remain unknown. Agents should treat this as a live x402 endpoint with confirmed pricing but uncertain functionality.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","pay-per-request","no-api-key","post-method"],"categories":["api-gateway","payments"],"synonyms":["premium API","x402 endpoint","pay-per-call API","USDC API","Base network API","lowpaymentfee","micropayment API"],"warnings":["The exact functionality of /api/v1/payments/118 is not described anywhere in the crawled content — 'Premium API Access' is the only label.","All documentation pages (docs, API, pricing, README) returned no substantive content, only a 'Connect wallet' prompt.","No OpenAPI schema or example payloads are available; input/output format is unknown.","The platform lists many other endpoints but this specific path does not appear among them."],"endpointUrl":"https://lowpaymentfee.com/api/v1/payments/118","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/118","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 with clear pricing ($0.02 USDC on Base). However, the actual functionality behind '/api/v1/payments/118' is undocumented — no OpenAPI spec, no request/response examples, and all documentation pages are empty beyond a wallet-connect prompt. This is effectively a stub 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'/request':17,34 '0.02':16,33,88,148 '000':144 '0x8335':134 '20':143 '2913':135 '300':158 '6':152 'Base network API' 'USDC API' 'accept':127 'access':7,24,42,118 'actual':233 'agent':244 'ai':72 'analysi':187 'analyt':71 'api':6,23,41,68,103,117,183,213 'base':9,26,99,137,145 'base-network' 'behind':164 'beyond':172 'call':4,21 'challeng':122,124 'collect':62 'commit':108 'confirm':125,254 'connect':222 'content':228 'contract':133 'crawl':210 'data':70 'decim':153 'describ':193 'detail':196,200 'doc':212 'document':171,201 'endpoint':36,53,81,112,167,241,252 'etc':189 'exact':162 'exampl':203 'financ':75 'format':238 'found':207 'function':163,258 'given':149 'host':60 'howev':160 'i.e':147 'infrastructur':78 'input':234 'key':104 'label':115 'land':178 'learn':74 'limit':106 'list':180 'live':250 'lowpaymentfee' 'lowpaymentfee.com':38,57 'machin':73 'mani':52 'maximum':141 'metric':184 'micropayment API' 'model':93 'network':100 'no-api-key' 'offer':54 'one':50 'openapi':198 'page':179,217 'paramet':235 'particular':166 'path':168 'pay':2,19,65 'pay-per-cal':1,18 'pay-per-call API' 'pay-per-request':64 'payabl':94 'payload':205 'payment':46,155 'per':3,20,66,90 'per-request':89 'platform':58,84,176 'post':128 'post-method' 'premium':5,22,40,116 'premium API' 'price':92,214,255 'prompt':224 'protocol':47 'provid':39 'rate':105 'readm':216 'remain':242 'report':185 'request':67,91,129 'request/response':204 'requir':109,139 'respons':237 'return':219 'schema':199 'second':159 'sentiment':186 'settl':12,29,130 'share':85 'span':69 'specif':111,182 'substant':227 'summar':188 'timeout':156 'titl':174 'treat':246 'uncertain':257 'uniform':87 'unit':146 'unknown':243 'usdc':14,31,96,132,150 'usdc-settlement' 'util':79 'via':10,27,43 'wallet':223 'web3':76 'x402':11,28,45,121,251 'x402 endpoint' 'x402-payment'","prices":[{"id":"6158fe74-88c2-42bd-8854-3134152751e1","listingId":"b07a6f9b-44f7-4092-8942-72844f2e1f45","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/118","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:49:22.695Z"}],"sources":[{"listingId":"b07a6f9b-44f7-4092-8942-72844f2e1f45","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/payments/118","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:49:22.695Z","lastSeenAt":"2026-04-23T19:01:17.158Z"}],"details":{"listingId":"b07a6f9b-44f7-4092-8942-72844f2e1f45","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/payments/118\n# Returns 402 with x402 payment challenge.\n# Attach X-PAYMENT header with a valid USDC payment proof on Base to access the resource.","exampleRequest":null,"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"The endpoint returns a 402 challenge requiring USDC payment on Base with maxAmountRequired of 20000 base units ($0.02).","source_url":"https://lowpaymentfee.com/api/v1/payments/118"},{"claim":"The platform advertises $0.02/request pricing with no API keys, no rate limits, and instant access on the Base network.","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913.","source_url":"https://lowpaymentfee.com/api/v1/payments/118"},{"claim":"The platform offers APIs across data & analytics, AI & ML, finance & Web3, and infrastructure categories.","source_url":"https://lowpaymentfee.com"}],"useCases":["Programmatic access to a premium API resource with per-call USDC micropayments","Agent-driven workflows that need keyless, pay-as-you-go API access on Base","Testing x402 payment protocol integrations against a live endpoint"],"bestFor":["Developers experimenting with x402 payment flows","Agents that can settle USDC payments on Base L2","Use cases requiring no-signup, no-API-key access"],"notFor":["Users who need detailed documentation or guaranteed SLAs before integrating","Applications requiring known, well-documented input/output schemas"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:10.103Z"},"updatedAt":"2026-04-23T19:01:17.158Z"}}