{"id":"864b9661-dcb2-4127-9482-e60d4de208fc","shortId":"aVHbRx","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/transactions/116` is labeled \"Premium API Access\" and requires a payment of up to 20,000 base units of USDC (0.02 USD) 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 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 endpoints are listed at the same $0.02/request price point.\n\nThe specific functionality behind `/api/v1/transactions/116` is not documented beyond the label \"Premium API Access.\" The crawled docs, pricing, and README pages all returned only a \"Connect wallet\" prompt with no additional content. There is no OpenAPI schema, no request/response examples, and no detailed documentation available for this or any other endpoint on the platform. The endpoint is confirmed live via a valid 402 challenge.","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","crypto-paid API"],"warnings":["No documentation available — all doc/pricing/README pages return only 'Connect wallet' with no useful content","The specific functionality of /api/v1/transactions/116 ('Premium API Access') is not described anywhere","No OpenAPI schema or request/response examples are provided","No way to determine what data or service this endpoint actually returns"],"endpointUrl":"https://lowpaymentfee.com/api/v1/transactions/116","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/116","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 no documentation, no OpenAPI schema, no request/response examples, and the actual functionality behind 'Premium API Access' is entirely undescribed. Docs pages return only 'Connect wallet' with no 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'/request':13,28,151 '0.02':12,27,76,150 '000':71 '20':70 '402':216 'Base network API' 'USDC micropayment API' 'accept':46 'access':62,91,167 'across':107 'addit':184 'advertis':82 'ai':117 'analysi':121 'analyt':111 'api':5,20,38,61,84,166 'attach':94 'avail':198 'base':8,23,51,72 'behind':157 'beyond':162 'broader':103 'call':4,19,79 'categori':109 'challeng':217 'classif':124 'confirm':211 'connect':179 'content':185 'convers':141 'crawl':169 'crypto-paid API' 'data':110,114 'detail':196 'doc':170 'document':161,197 'embed':125 'endpoint':55,106,144,204,209 'estim':135 'exampl':193 'exchang':130 'export':115 'feed':129 'financ':126 'four':108 'function':156 'gas':134 'generat':142 'geocod':139 'header':98 'infrastructur':137 'insight':116 'instant':90 'json-response' 'key':85 'label':59,164 'learn':119 'limit':88 'list':146 'live':212 'low payment fee API' 'lowpaymentfee' 'lowpaymentfee.com':31 'machin':118 'metric':112 'network':9,24,52 'no-api-key' 'offer':105 'openapi':189 'page':174 'pay':2,17,35 'pay-per-cal':1,16 'pay-per-call API' 'pay-per-request':34 'payment':48,66,97 'per':3,18,36,78 'platform':6,21,39,81,104,207 'point':153 'premium':60,165 'price':128,152,171 'prompt':181 'protocol':44 'quot':133 'rate':87,131 'readm':173 'report':113 'request':37,101 'request/response':192 'requir':64 'return':176 'schema':190 'sentiment':120 'simpli':93 'specif':54,155 'summar':123 'text':122 'token':132 'unit':73 'usd':77 'usdc':15,30,47,75 'usdc-base-network' 'use':41 'util':138 'valid':140,215 'via':10,25,213 'wallet':180 'web3':127 'x402':11,26,43,96 'x402 API' 'x402-payment'","prices":[{"id":"52c8be9e-577e-48b1-ac9f-a72d81921a60","listingId":"864b9661-dcb2-4127-9482-e60d4de208fc","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/116","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:58:14.938Z"}],"sources":[{"listingId":"864b9661-dcb2-4127-9482-e60d4de208fc","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/transactions/116","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:58:14.938Z","lastSeenAt":"2026-04-23T23:03:08.239Z"}],"details":{"listingId":"864b9661-dcb2-4127-9482-e60d4de208fc","quickStartSnippet":"# The endpoint requires an X-PAYMENT header with a valid x402 payment proof.\n# Using curl (you need an x402-compatible client to generate the header):\ncurl -X POST https://lowpaymentfee.com/api/v1/transactions/116 \\\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 requiring up to 20,000 base units of USDC on Base network","source_url":"https://lowpaymentfee.com/api/v1/transactions/116"},{"claim":"The platform lists endpoints at $0.02/request across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"},{"claim":"Platform advertises no API keys, no rate limits, instant access, and Base network settlement","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset contract on Base: 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/transactions/116"}],"useCases":["Accessing premium API data with per-request USDC micropayments on Base","Agent-driven workflows that need keyless, pay-as-you-go API access","Programmatic access to analytics, AI, finance, or utility endpoints without subscriptions"],"bestFor":["Developers who want zero-commitment, pay-per-use API access","AI agents with x402-compatible wallets on Base","Users who prefer crypto micropayments over API key management"],"notFor":["Users who need detailed API documentation or OpenAPI specs before integrating","High-volume consumers who would benefit from bulk pricing or subscriptions","Developers without a Base-network USDC wallet"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:44.612Z"},"updatedAt":"2026-04-23T23:03:08.239Z"}}