{"id":"95e90f7f-9623-4757-8aad-4996dbd15007","shortId":"MeaNWW","kind":"x402","title":"Pay-per-call API platform on Base network via x402 — $0.02/request in USDC, no API keys required.","tagline":"Pay-per-call API platform on Base network via x402 — $0.02/request in USDC, no API keys required.","description":"lowpaymentfee.com is a pay-per-request API platform that uses the x402 protocol to accept USDC payments on the Base network. The specific endpoint at `/api/v1/payments/318` is listed as \"Premium API Access\" and returns a 402 challenge requesting up to 20,000 base units of USDC (0.02 USD) per call. No API keys, rate limits, or upfront commitments are required — each request is paid individually via an X-PAYMENT header.\n\nThe broader platform advertises multiple API categories including 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 listed at the same $0.02/request price point. However, the specific functionality behind the `/api/v1/payments/318` endpoint is not documented beyond its \"Premium API Access\" label.\n\nPayments settle on Base via USDC (contract `0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913`) to address `0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3`. The x402 challenge specifies version 1 with an \"exact\" payment scheme and a 300-second timeout. The endpoint accepts POST requests and returns `application/json`.","tags":[],"capabilities":["x402-payment","usdc-base-network","pay-per-request","no-api-key","json-response","http-post"],"categories":["api-gateway","infrastructure"],"synonyms":["x402 API","pay-per-call API","USDC micropayment API","Base network API","lowpaymentfee","premium API access","crypto-paid API"],"warnings":["The specific functionality of /api/v1/payments/318 ('Premium API Access') is not documented anywhere — it is unclear what data or service it returns.","All documentation pages (docs, api, pricing, README) render only a 'Connect wallet' prompt with no actual content.","No OpenAPI spec, request schema, or response examples are available.","The endpoint path '/api/v1/payments/318' does not match any of the advertised API categories on the homepage, suggesting it may be a generic or test endpoint."],"endpointUrl":"https://lowpaymentfee.com/api/v1/payments/318","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/318","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.350","qualityRationale":"The endpoint is live and returns a valid x402 402 challenge, confirming pricing and payment details. However, the actual functionality behind '/api/v1/payments/318' is undocumented — there is no OpenAPI schema, no request/response examples, and the docs/pricing/README pages are all blank ('Connect wallet' only). The listing is essentially a stub with confirmed liveness but unknown 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'/request':13,32,160 '0.02':12,31,86,159 '000':81 '0x1a2b13e97f5f837c8f9fa1f95a1484b7c70d85f3':190 '0x833589fcd6edb6e08f4c7c32d4f71b54bda02913':187 '1':196 '20':80 '300':204 '402':75 'Base network API' 'USDC micropayment API' 'accept':54,209 'access':71,178 'address':189 'advertis':114 'ai':126 'analysi':130 'analyt':120 'api':5,17,24,36,46,70,91,116,177 'application/json':214 'base':8,27,59,82,183 'behind':167 'beyond':174 'broader':112 'call':4,23,89 'categori':117 'challeng':76,193 'classif':133 'commit':97 'contract':186 'convers':150 'crypto-paid API' 'data':119,123 'document':173 'embed':134 'endpoint':63,153,170,208 'estim':144 'exact':199 'exchang':139 'export':124 'feed':138 'financ':135 'function':166 'gas':143 'generat':151 'geocod':148 'header':110 'howev':163 'http-post' 'includ':118 'individu':104 'infrastructur':146 'insight':125 'json-response' 'key':18,37,92 'label':179 'learn':128 'limit':94 'list':67,155 'lowpaymentfee' 'lowpaymentfee.com':39 'machin':127 'metric':121 'multipl':115 'network':9,28,60 'no-api-key' 'paid':103 'pay':2,21,43 'pay-per-cal':1,20 'pay-per-call API' 'pay-per-request':42 'payment':56,109,180,200 'per':3,22,44,88 'platform':6,25,47,113 'point':162 'post':210 'premium':69,176 'premium API access' 'price':137,161 'protocol':52 'quot':142 'rate':93,140 'report':122 'request':45,77,101,211 'requir':19,38,99 'return':73,213 'scheme':201 'second':205 'sentiment':129 'settl':181 'specif':62,165 'specifi':194 'summar':132 'text':131 'timeout':206 'token':141 'unit':83 'upfront':96 'usd':87 'usdc':15,34,55,85,185 'usdc-base-network' 'use':49 'util':147 'valid':149 'version':195 'via':10,29,105,184 'web3':136 'x':108 'x-payment':107 'x402':11,30,51,192 'x402 API' 'x402-payment'","prices":[{"id":"98720625-4668-4197-819f-4825f67dac03","listingId":"95e90f7f-9623-4757-8aad-4996dbd15007","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/318","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:50:20.476Z"}],"sources":[{"listingId":"95e90f7f-9623-4757-8aad-4996dbd15007","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/payments/318","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:50:20.476Z","lastSeenAt":"2026-04-23T12:31:28.369Z"}],"details":{"listingId":"95e90f7f-9623-4757-8aad-4996dbd15007","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/payments/318 \\\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 challenge requesting up to 20,000 base units of USDC (0.02 USD) on Base network","source_url":"https://lowpaymentfee.com/api/v1/payments/318"},{"claim":"All endpoints are listed at $0.02/request with no API keys, no rate limits, and instant access","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/payments/318"},{"claim":"Platform offers Data & Analytics, AI & ML, Finance & Web3, and Infrastructure API categories","source_url":"https://lowpaymentfee.com"}],"useCases":["Agents that need on-demand API access without managing API keys or subscriptions","Programmatic access to premium endpoints with per-call USDC micropayments","Testing x402 protocol integrations on Base network"],"bestFor":["Developers wanting zero-commitment, pay-as-you-go API access","AI agents with crypto wallets that can settle x402 payments automatically","Users who prefer no rate limits and instant access without signup"],"notFor":["Users without a Base-network USDC wallet","High-volume consumers who need bulk pricing or subscription discounts","Anyone needing detailed documentation — the docs pages are essentially empty"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:07.398Z"},"updatedAt":"2026-04-23T12:31:28.369Z"}}