{"id":"ad22ff70-be2e-4056-ba77-1a54139a96a3","shortId":"wKPsch","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 `/api/v1/transactions/108` is labeled \"Premium API Access\" and charges up to 20,000 base units of USDC (i.e., $0.02) per call. The platform advertises no API keys, no rate limits, and instant access — you simply attach an x402 payment header to each request.\n\nThe broader platform lists 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 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 spec, no request/response schema documentation, and no example payloads available. The specific functionality behind the `/api/v1/transactions/108` endpoint (labeled generically as \"Premium API Access\") is unclear — it does not map to any of the named API categories on the landing page. The endpoint is live and returns a valid x402 402 challenge, but without documentation it is difficult to know what data or service it actually provides.","tags":[],"capabilities":["x402-payment","usdc-base-network","pay-per-request","no-api-key","json-response"],"categories":["api-platform","finance"],"synonyms":["x402 API","pay-per-call API","USDC micropayment API","Base network API","lowpaymentfee","low payment fee API","402 payment API"],"warnings":["No OpenAPI or schema documentation available — all docs/pricing/README pages render only 'Connect wallet'","The specific endpoint /api/v1/transactions/108 ('Premium API Access') does not correspond to any named API on the landing page; its actual functionality is unknown","No example request or response payloads are available anywhere in the crawled material","No robots.txt or agents.txt found"],"endpointUrl":"https://lowpaymentfee.com/api/v1/transactions/108","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/transactions/108","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 402 challenge, confirming it accepts USDC on Base at $0.02/request. However, there is no OpenAPI spec, no request/response schema, no documentation beyond a wallet-connect prompt, and the specific purpose of the /transactions/108 endpoint is undocumented. This is effectively a stub 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'/request':13,28 '0.02':12,27,73,144 '000':67 '20':66 '402':224 '402 payment API' 'Base network API' 'USDC micropayment API' 'accept':46 'access':61,87,197 'across':103 'actual':239 'advertis':78 'ai':113 'analysi':117 'analyt':107 'api':5,20,38,60,80,154,196,209 'attach':90 'avail':184 'base':8,23,51,68 'behind':188 'broader':99 'call':4,19,75 'categori':105,210 'challeng':225 'charg':63 'classif':120 'connect':163 'convers':137 'data':106,110,235 'detail':170 'difficult':231 'doc':153 'document':148,179,228 'embed':121 'endpoint':55,102,140,191,216 'estim':131 'exampl':182 'exchang':126 'export':111 'extrem':150 'feed':125 'financ':122 'four':104 'function':187 'gas':130 'generat':138 'generic':193 'geocod':135 'header':94 'howev':147 'i.e':72 'infrastructur':133 'insight':112 'instant':86 'json-response' 'key':81 'know':233 'label':58,192 'land':213 'learn':115 'limit':84 'list':101 'live':218 'low payment fee API' 'lowpaymentfee' 'lowpaymentfee.com':31 'machin':114 'map':203 'metric':108 'name':208 'network':9,24,52 'no-api-key' 'openapi':174 'page':158,214 'pay':2,17,35 'pay-per-cal':1,16 'pay-per-call API' 'pay-per-request':34 'payload':183 'payment':48,93 'per':3,18,36,74,145 'platform':6,21,39,77,100 'premium':59,195 'price':124,142,155 'prompt':165 'protocol':44 'provid':240 'quot':129 'rate':83,127 'readm':157 'render':160 'report':109 'request':37,97,146 'request/response':177 'return':220 'schema':178 'sentiment':116 'servic':237 'simpli':89 'spec':175 'specif':54,186 'summar':119 'technic':169 'text':118 'thin':151 'token':128 'unclear':199 'unit':69 'usdc':15,30,47,71 'usdc-base-network' 'use':41 'util':134 'valid':136,222 'via':10,25 'wallet':164 'web3':123 'without':227 'x402':11,26,43,92,223 'x402 API' 'x402-payment'","prices":[{"id":"6da4dca3-b242-4757-9555-babdefb4b63a","listingId":"ad22ff70-be2e-4056-ba77-1a54139a96a3","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/transactions/108","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:58:20.143Z"}],"sources":[{"listingId":"ad22ff70-be2e-4056-ba77-1a54139a96a3","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/transactions/108","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:58:20.143Z","lastSeenAt":"2026-04-23T23:03:08.463Z"}],"details":{"listingId":"ad22ff70-be2e-4056-ba77-1a54139a96a3","quickStartSnippet":"# The endpoint returns HTTP 402 with an x402 challenge.\n# Attach a valid X-PAYMENT header (x402 v1, USDC on Base) to complete the call.\ncurl -X POST https://lowpaymentfee.com/api/v1/transactions/108 \\\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 (asset 0x8335…) on Base network","source_url":"https://lowpaymentfee.com/api/v1/transactions/108"},{"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 lists APIs across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"},{"claim":"Docs, API, pricing, and README pages all show only a 'Connect wallet' prompt","source_url":"https://lowpaymentfee.com/docs"}],"useCases":["Accessing premium API data with per-request USDC micropayments on Base","Agent-driven API consumption without pre-registration or API keys","Programmatic pay-as-you-go access to analytics, AI, finance, or utility endpoints"],"bestFor":["Developers wanting zero-signup, pay-per-call API access","AI agents that can settle x402 payments autonomously","Users comfortable paying in USDC on the Base L2 network"],"notFor":["Users who need detailed API documentation or OpenAPI specs before integrating","Anyone requiring free-tier or fiat-only payment options","Production workloads that need SLA guarantees or support"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:44.367Z"},"updatedAt":"2026-04-23T23:03:08.463Z"}}