{"id":"2a54e61b-7708-4bf9-bcd1-3a09e406ee03","shortId":"pxaam7","kind":"x402","title":"Pay-per-call API platform on Base (USDC) via x402 — $0.02/request, no API keys required.","tagline":"Pay-per-call API platform on Base (USDC) via x402 — $0.02/request, 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 `/api/v1/payments/149` is listed as \"Premium API Access\" and charges up to 20,000 base units of USDC (i.e., $0.02 per call, since USDC uses 6 decimals). No API keys, rate limits, or upfront commitments are required — each request is individually settled on-chain.\n\nThe broader platform advertises several categories of endpoints 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 uniformly priced at $0.02 per request.\n\nHowever, the specific functionality behind this particular endpoint (`/api/v1/payments/149`) is not documented beyond the label \"Premium API Access.\" There is no OpenAPI schema, no request/response examples, and the docs, pricing, and API pages all resolve to a minimal \"Connect wallet\" prompt with no further detail. The endpoint is confirmed live (returns a valid 402 x402 challenge), but what data or service it actually returns upon successful payment is unknown.","tags":[],"capabilities":["x402-payment","usdc-base-network","pay-per-request","no-api-key","json-response"],"categories":["payments","api-platform"],"synonyms":["x402 API","pay-per-call API","USDC micropayment API","Base network API","lowpaymentfee","premium API access","crypto-paid API"],"warnings":["No documentation exists for this specific endpoint — the actual service/data returned is unknown","All doc, pricing, API, and README pages resolve to a minimal 'Connect wallet' stub with no content","No OpenAPI or schema describing request parameters or response format","The endpoint path '/api/v1/payments/149' does not match any of the advertised API categories on the homepage, so its purpose is unclear"],"endpointUrl":"https://lowpaymentfee.com/api/v1/payments/149","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/149","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.300","qualityRationale":"The endpoint is confirmed live with a valid x402 402 challenge, but there is zero documentation on what the endpoint actually returns. No OpenAPI schema, no request/response examples, and the docs pages are empty stubs. The label 'Premium API Access' is generic and 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'/request':13,30 '0.02':12,29,78,152 '000':72 '20':71 '402':208 '6':84 'Base network API' 'USDC micropayment API' 'accept':50 'access':66,172 'actual':217 'advertis':107 'ai':120 'analysi':124 'analyt':114 'api':5,15,22,32,42,65,87,171,186 'base':8,25,55,73 'behind':159 'beyond':167 'broader':105 'call':4,21,80 'categori':109 'chain':103 'challeng':210 'charg':68 'classif':127 'commit':93 'confirm':203 'connect':193 'convers':144 'crypto-paid API' 'data':113,117,213 'decim':85 'detail':199 'doc':183 'document':166 'embed':128 'endpoint':59,111,147,162,201 'estim':138 'exampl':180 'exchang':133 'export':118 'feed':132 'financ':129 'function':158 'gas':137 'generat':145 'geocod':142 'howev':155 'i.e':77 'includ':112 'individu':99 'infrastructur':140 'insight':119 'json-response' 'key':16,33,88 'label':169 'learn':122 'limit':90 'list':62 'live':204 'lowpaymentfee' 'lowpaymentfee.com':35 'machin':121 'metric':115 'minim':192 'network':56 'no-api-key' 'on-chain':101 'openapi':176 'page':187 'particular':161 'pay':2,19,39 'pay-per-cal':1,18 'pay-per-call API' 'pay-per-request':38 'payment':52,221 'per':3,20,40,79,153 'platform':6,23,43,106 'premium':64,170 'premium API access' 'price':131,150,184 'prompt':195 'protocol':48 'quot':136 'rate':89,134 'report':116 'request':41,97,154 'request/response':179 'requir':17,34,95 'resolv':189 'return':205,218 'schema':177 'sentiment':123 'servic':215 'settl':100 'sever':108 'sinc':81 'specif':58,157 'success':220 'summar':126 'text':125 'token':135 'uniform':149 'unit':74 'unknown':223 'upfront':92 'upon':219 'usdc':9,26,51,76,82 'usdc-base-network' 'use':45,83 'util':141 'valid':143,207 'via':10,27 'wallet':194 'web3':130 'x402':11,28,47,209 'x402 API' 'x402-payment'","prices":[{"id":"648f76c6-839e-45df-9192-14dc9f51e9e8","listingId":"2a54e61b-7708-4bf9-bcd1-3a09e406ee03","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/149","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:49:39.669Z"}],"sources":[{"listingId":"2a54e61b-7708-4bf9-bcd1-3a09e406ee03","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/payments/149","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:49:39.669Z","lastSeenAt":"2026-04-24T06:32:15.951Z"}],"details":{"listingId":"2a54e61b-7708-4bf9-bcd1-3a09e406ee03","quickStartSnippet":"# The endpoint requires an x402 payment header with USDC on Base.\n# 1. Send a POST to get the 402 challenge:\ncurl -X POST https://lowpaymentfee.com/api/v1/payments/149\n# 2. Parse the 402 JSON, construct an X-PAYMENT header\n#    with a signed USDC transfer of 0.02 USDC to\n#    0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3\n# 3. Resend the POST with the X-PAYMENT header attached.","exampleRequest":null,"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"The endpoint returns a valid x402 402 challenge with maxAmountRequired of 20000 base units of USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/payments/149"},{"claim":"All endpoints are priced at $0.02 per request with no API keys, no rate limits, and instant access","source_url":"https://lowpaymentfee.com"},{"claim":"The platform offers endpoints across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset address is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base network","source_url":"https://lowpaymentfee.com/api/v1/payments/149"}],"useCases":["Agents that need to call paid APIs without pre-registering for API keys","Programmatic access to a pay-per-use endpoint settled in USDC on Base","Testing x402 protocol integrations with a low-cost live endpoint"],"bestFor":["Developers experimenting with x402 payment protocol","AI agents with USDC wallets on Base that need on-demand API access","Low-volume, no-commitment API consumption without signup"],"notFor":["Users who need detailed documentation or guaranteed SLAs before paying","High-volume use cases where $0.02/request adds up without bulk discounts","Anyone who needs to know exactly what the endpoint returns before paying"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:09.207Z"},"updatedAt":"2026-04-24T06:32:15.951Z"}}