{"id":"306db76b-c2c5-4191-a857-050005fe933c","shortId":"YhyuNw","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 is one of many x402-gated API endpoints offered by the platform. The specific path `/api/v1/payments/180` is listed as \"Premium API Access\" and accepts POST requests with payment in USDC on the Base network. The x402 challenge advertises a maxAmountRequired of 20,000 base units of USDC (6 decimals), which equals $0.02 per request — consistent with the site's uniform $0.02/request pricing across all endpoints.\n\nThe broader lowpaymentfee.com platform offers endpoints spanning four categories: Data & Analytics (metrics, reports, data export, insights), AI & Machine Learning (sentiment analysis, text summarization, classification, embeddings), Finance & Web3 (price feeds, exchange rates, token quotes, gas estimates), and Infrastructure utilities (geocoding, validation, conversion, generation). All endpoints are priced at $0.02 per request with no API keys, no rate limits, and no minimum commitments required. Payments settle in USDC on the Base L2 network.\n\nHowever, the specific functionality behind the `/api/v1/payments/180` path is unclear. It does not map to any of the documented endpoint categories on the landing page, and the description is simply \"Premium API Access\" with no further detail. Documentation pages (docs, pricing, README) all returned only a \"Connect wallet\" prompt with no substantive content. Without knowing what this endpoint actually returns, callers should treat it as an opaque paid endpoint until more documentation is available.","tags":[],"capabilities":["x402-payment","usdc-base","pay-per-request","post-method","json-response"],"categories":["api-gateway","payments"],"synonyms":["x402 API","pay-per-call API","USDC micropayment endpoint","Base network API","lowpaymentfee","premium API access","crypto-paid API"],"warnings":["The specific endpoint /api/v1/payments/180 is not listed among the documented APIs on the landing page — its actual functionality is unknown.","All documentation pages (docs, pricing, README, api) returned only 'Connect wallet' with no substantive content.","No request body schema or response schema is available — callers cannot know what to send or what to expect back.","No SLA, rate limit details, or uptime guarantees are documented."],"endpointUrl":"https://lowpaymentfee.com/api/v1/payments/180","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/180","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 the actual functionality behind /api/v1/payments/180 is undocumented. No request/response schema, no docs, no examples. The landing page lists many endpoints but this specific path isn't among them. Effectively a stub 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'/request':13,28,97 '0.02':12,27,87,96,149 '000':78 '20':77 '6':83 'Base network API' 'USDC micropayment endpoint' 'accept':59 'access':7,22,57,205 'across':99 'actual':231 'advertis':73 'ai':118 'analysi':122 'analyt':112 'api':6,21,42,56,154,204 'avail':246 'base':9,24,68,79,170 'behind':177 'broader':103 'call':4,19 'caller':233 'categori':110,193 'challeng':72 'classif':125 'commit':162 'connect':219 'consist':90 'content':225 'convers':142 'crypto-paid API' 'data':111,115 'decim':84 'descript':200 'detail':209 'doc':212 'document':191,210,244 'embed':126 'endpoint':32,43,101,107,145,192,230,241 'equal':86 'estim':136 'exchang':131 'export':116 'feed':130 'financ':127 'four':109 'function':176 'gas':135 'gate':41 'generat':143 'geocod':140 'howev':173 'infrastructur':138 'insight':117 'json-response' 'key':155 'know':227 'l2':171 'land':196 'learn':120 'limit':158 'list':53 'lowpaymentfee' 'lowpaymentfee.com':34,104 'machin':119 'mani':38 'map':186 'maxamountrequir':75 'metric':113 'minimum':161 'network':69,172 'offer':44,106 'one':36 'opaqu':239 'page':197,211 'paid':240 'path':50,180 'pay':2,17 'pay-per-cal':1,16 'pay-per-call API' 'pay-per-request' 'payment':63,164 'per':3,18,88,150 'platform':47,105 'post':60 'post-method' 'premium':5,20,55,203 'premium API access' 'price':98,129,147,213 'prompt':221 'quot':134 'rate':132,157 'readm':214 'report':114 'request':61,89,151 'requir':163 'return':216,232 'sentiment':121 'settl':165 'simpli':202 'site':93 'span':108 'specif':49,175 'substant':224 'summar':124 'text':123 'token':133 'treat':235 'unclear':182 'uniform':95 'unit':80 'usdc':15,30,65,82,167 'usdc-base' 'util':139 'valid':141 'via':10,25 'wallet':220 'web3':128 'without':226 'x402':11,26,40,71 'x402 API' 'x402-gated':39 'x402-payment'","prices":[{"id":"e44987e1-f012-4901-821a-ddd06877c3ce","listingId":"306db76b-c2c5-4191-a857-050005fe933c","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/180","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:49:35.960Z"}],"sources":[{"listingId":"306db76b-c2c5-4191-a857-050005fe933c","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/payments/180","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:49:35.960Z","lastSeenAt":"2026-04-23T17:31:47.804Z"}],"details":{"listingId":"306db76b-c2c5-4191-a857-050005fe933c","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/payments/180 \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402-payment-header>\"","exampleRequest":null,"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"maxAmountRequired is 20000 base units of USDC (asset 0x8335…) on Base, equaling $0.02 per request","source_url":"https://lowpaymentfee.com/api/v1/payments/180"},{"claim":"The platform advertises $0.02/request pricing with no API keys, no rate limits, and instant access on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"Endpoint categories include Data & Analytics, AI & ML, Finance & Web3, and Infrastructure utilities","source_url":"https://lowpaymentfee.com"},{"claim":"Documentation pages returned only 'Connect wallet' with no substantive content","source_url":"https://lowpaymentfee.com/docs"}],"useCases":["Programmatic access to a paid API endpoint without API key management","Agent-driven pay-per-call workflows using x402 protocol on Base","Testing x402 payment flows with low-cost USDC transactions"],"bestFor":["Developers experimenting with x402 payment protocol","Agents that need keyless, pay-as-you-go API access","Low-cost per-request micropayment use cases"],"notFor":["Users who need detailed documentation of what the endpoint returns","High-throughput production workloads (no SLA or uptime guarantees documented)","Users without USDC on Base network"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:09.399Z"},"updatedAt":"2026-04-23T17:31:47.804Z"}}