{"id":"a2fe8018-c35c-4e3b-87b3-34ff6924d6db","shortId":"X5rmGq","kind":"x402","title":"Pay-per-call API platform on Base network via x402 — $0.02/request in USDC.","tagline":"Pay-per-call API platform on Base network via x402 — $0.02/request in USDC.","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/83` is labeled \"Premium API Access\" and requires a maximum of 20,000 base units of USDC (i.e., $0.02) per call. The platform advertises no API keys, no rate limits, and instant access — callers simply attach an X-PAYMENT header with a valid x402 payment proof.\n\nThe broader platform offers endpoints across 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 listed endpoints are priced at $0.02 per request.\n\nHowever, documentation is extremely thin. The docs, API, pricing, and README pages all render only a \"Connect wallet\" prompt with no further technical detail. There is no OpenAPI schema, no request/response examples, and no description of what the `/api/v1/payments/83` endpoint specifically returns. The endpoint is confirmed live (returns a valid 402 challenge), but without documentation it is unclear what data or functionality this particular path provides versus the other named endpoints on the platform.","tags":[],"capabilities":["x402-payment","usdc-base-network","pay-per-request","no-api-key","json-response","post-method"],"categories":["api-platform","payments"],"synonyms":["low payment fee","x402 api","pay per call api","usdc api","base network api","micropayment api","402 payment api"],"warnings":["No documentation available — docs, API, pricing, and README pages all show only 'Connect wallet'","No OpenAPI or schema describing request parameters or response format","The specific function of /api/v1/payments/83 is unclear — 'Premium API Access' is not descriptive","Cannot verify what data or service is actually returned upon successful payment"],"endpointUrl":"https://lowpaymentfee.com/api/v1/payments/83","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/83","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 402 challenge and pricing is clear ($0.02 USDC on Base). However, there is no OpenAPI schema, no request/response examples, and all documentation pages render only 'Connect wallet' with no technical content. The specific purpose of /api/v1/payments/83 ('Premium API Access') is undocumented, making this effectively a stub 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'/request':13,28 '0.02':12,27,75,151 '000':69 '20':68 '402':204 '402 payment api' 'accept':46 'access':62,89 'across':109 'advertis':80 'ai':119 'analysi':123 'analyt':113 'api':5,20,38,61,82,161 'attach':92 'base':8,23,51,70 'base network api' 'broader':105 'call':4,19,77 'caller':90 'categori':111 'challeng':205 'classif':126 'confirm':199 'connect':170 'convers':143 'data':112,116,213 'descript':188 'detail':177 'doc':160 'document':155,208 'embed':127 'endpoint':55,108,147,193,197,224 'estim':137 'exampl':185 'exchang':132 'export':117 'extrem':157 'feed':131 'financ':128 'four':110 'function':215 'gas':136 'generat':144 'geocod':141 'header':97 'howev':154 'i.e':74 'infrastructur':139 'insight':118 'instant':88 'json-response' 'key':83 'label':59 'learn':121 'limit':86 'list':146 'live':200 'low payment fee' 'lowpaymentfee.com':31 'machin':120 'maximum':66 'metric':114 'micropayment api' 'name':223 'network':9,24,52 'no-api-key' 'offer':107 'openapi':181 'page':165 'particular':217 'path':218 'pay':2,17,35 'pay per call api' 'pay-per-cal':1,16 'pay-per-request':34 'payment':48,96,102 'per':3,18,36,76,152 'platform':6,21,39,79,106,227 'post-method' 'premium':60 'price':130,149,162 'prompt':172 'proof':103 'protocol':44 'provid':219 'quot':135 'rate':85,133 'readm':164 'render':167 'report':115 'request':37,153 'request/response':184 'requir':64 'return':195,201 'schema':182 'sentiment':122 'simpli':91 'specif':54,194 'summar':125 'technic':176 'text':124 'thin':158 'token':134 'unclear':211 'unit':71 'usdc':15,30,47,73 'usdc api' 'usdc-base-network' 'use':41 'util':140 'valid':100,142,203 'versus':220 'via':10,25 'wallet':171 'web3':129 'without':207 'x':95 'x-payment':94 'x402':11,26,43,101 'x402 api' 'x402-payment'","prices":[{"id":"9252bebb-ea6a-48eb-a8a6-7c8aa0ba0177","listingId":"a2fe8018-c35c-4e3b-87b3-34ff6924d6db","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/83","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:50:57.491Z"}],"sources":[{"listingId":"a2fe8018-c35c-4e3b-87b3-34ff6924d6db","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/payments/83","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:50:57.491Z","lastSeenAt":"2026-04-23T19:01:22.865Z"}],"details":{"listingId":"a2fe8018-c35c-4e3b-87b3-34ff6924d6db","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/payments/83 \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402-payment-proof>\"","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 network","source_url":"https://lowpaymentfee.com/api/v1/payments/83"},{"claim":"All listed 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 in 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/83"}],"useCases":["Programmatic access to API services without managing API keys or subscriptions","Agent-driven workflows that need on-demand, per-call billing via crypto","Testing x402 protocol integrations with a low-cost endpoint"],"bestFor":["Developers exploring x402 payment protocol on Base","Agents that need keyless, pay-as-you-go API access","Low-volume or sporadic API consumers who want no commitments"],"notFor":["Users who need detailed API documentation or OpenAPI specs before integrating","High-volume consumers who need bulk pricing or rate guarantees","Anyone without a Base-network USDC wallet"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:05.55Z"},"updatedAt":"2026-04-23T19:01:22.865Z"}}