{"id":"4f08806f-8407-4f00-ab32-b75aa534e414","shortId":"ehX5Te","kind":"x402","title":"Pay-per-call API platform on Base via x402 — $0.02/request, no API keys required.","tagline":"Pay-per-call API platform on Base via x402 — $0.02/request, no API keys required.","description":"lowpaymentfee.com is an x402-enabled API platform that offers a broad catalog of endpoints spanning data analytics, AI/ML inference, finance/Web3 data, and utility services. All endpoints are paid per-request using USDC on the Base network via the x402 protocol, eliminating the need for API keys, subscriptions, or rate limits.\n\nThe specific endpoint at `/api/v1/charges/98` is listed as \"Premium API Access\" and accepts POST requests. The x402 challenge indicates a maximum cost of 20,000 base units of USDC (0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base), which equals $0.02 per request (USDC uses 6 decimals). Payment is sent to address 0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3 with a 300-second timeout.\n\nThe broader platform advertises endpoints for sentiment analysis, text summarization, classification, embeddings, price feeds, exchange rates, token quotes, gas estimates, geocoding, validation, conversion, and data generation — all at the same $0.02/request price point. However, documentation is extremely sparse: 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 usage examples available from the crawled content. The actual functionality behind this specific `/charges/98` endpoint and the other listed endpoints cannot be verified from the available material.","tags":[],"capabilities":["x402-payment","per-request-billing","usdc-base","no-api-key","post-endpoint","pay-per-use"],"categories":["api-platform","infrastructure"],"synonyms":["low payment fee","x402 API","pay per call API","USDC API","Base network API","micropayment API","lowpaymentfee"],"warnings":["No documentation available — docs, API, pricing, and README pages all show only 'Connect wallet' with no content","No OpenAPI or schema definition for any endpoint","The specific purpose of /api/v1/charges/98 ('Premium API Access') is completely undocumented","Cannot verify what data or functionality any of the advertised endpoints actually return","The broad catalog of endpoints (AI, finance, analytics, utils) is listed on the homepage but none have verifiable documentation"],"endpointUrl":"https://lowpaymentfee.com/api/v1/charges/98","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/charges/98","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.300","qualityRationale":"The endpoint is live (402 challenge captured) and pricing is clear ($0.02 USDC on Base), but there is zero documentation on what the endpoint actually does, no request/response schemas, no examples, and no OpenAPI spec. The docs/pricing/README pages are all empty beyond a wallet-connect prompt. The listing title 'Premium API Access' is generic and 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'/charges/98':219 '/request':12,28,168 '0.02':11,27,119,167 '000':109 '0x1a2b13e97f5f837c8f9fa1f95a1484b7c70d85f3':131 '0x833589fcd6edb6e08f4c7c32d4f71b54bda02913':114 '20':108 '300':134 '6':124 'Base network API' 'USDC API' 'accept':97 'access':95 'actual':214 'address':130 'advertis':140 'ai/ml':51 'analysi':144 'analyt':50 'api':5,14,21,30,39,79,94,178 'avail':208,231 'base':8,24,69,110,116 'behind':216 'broad':44 'broader':138 'call':4,20 'cannot':226 'catalog':45 'challeng':102 'classif':147 'connect':187 'content':212 'convers':159 'cost':106 'crawl':211 'data':49,54,161 'decim':125 'detail':194 'doc':177 'document':172,203 'elimin':75 'embed':148 'enabl':38 'endpoint':47,59,87,141,220,225 'equal':118 'estim':156 'exampl':207 'exchang':151 'extrem':174 'feed':150 'finance/web3':53 'function':215 'gas':155 'generat':162 'geocod':157 'howev':171 'indic':103 'infer':52 'key':15,31,80 'limit':84 'list':91,224 'low payment fee' 'lowpaymentfee' 'lowpaymentfee.com':33 'materi':232 'maximum':105 'micropayment API' 'need':77 'network':70 'no-api-key' 'offer':42 'openapi':198 'page':182 'paid':61 'pay':2,18 'pay per call API' 'pay-per-cal':1,17 'pay-per-use' 'payment':126 'per':3,19,63,120 'per-request':62 'per-request-billing' 'platform':6,22,40,139 'point':170 'post':98 'post-endpoint' 'premium':93 'price':149,169,179 'prompt':189 'protocol':74 'quot':154 'rate':83,152 'readm':181 'render':184 'request':64,99,121 'request/response':201 'requir':16,32 'schema':202 'second':135 'sent':128 'sentiment':143 'servic':57 'span':48 'spars':175 'spec':199 'specif':86,218 'subscript':81 'summar':146 'technic':193 'text':145 'timeout':136 'token':153 'unit':111 'usag':206 'usdc':66,113,122 'usdc-base' 'use':65,123 'util':56 'valid':158 'verifi':228 'via':9,25,71 'wallet':188 'x402':10,26,37,73,101 'x402 API' 'x402-enabled':36 'x402-payment'","prices":[{"id":"c0fa2959-ecda-45c8-815d-9d9de9c1102f","listingId":"4f08806f-8407-4f00-ab32-b75aa534e414","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/charges/98","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:45:39.847Z"}],"sources":[{"listingId":"4f08806f-8407-4f00-ab32-b75aa534e414","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/charges/98","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:45:39.847Z","lastSeenAt":"2026-04-24T10:32:39.409Z"}],"details":{"listingId":"4f08806f-8407-4f00-ab32-b75aa534e414","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/charges/98 \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402-payment-token>\" \\\n  -d '{}'","exampleRequest":null,"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"The endpoint returns a 402 x402 challenge with maxAmountRequired of 20000 base units of USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/charges/98"},{"claim":"All endpoints are priced at $0.02 per request with no API keys, no rate limits, and instant access on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"The platform lists endpoints for analytics, AI/ML, finance/Web3, and infrastructure utilities","source_url":"https://lowpaymentfee.com"},{"claim":"Docs, API, pricing, and README pages render only 'Connect wallet' with no additional content","source_url":"https://lowpaymentfee.com/docs"}],"useCases":["Agents needing on-demand API access without pre-registration or API keys","Programmatic access to utility, analytics, or AI endpoints with crypto micropayments","Testing x402 protocol integrations on Base network"],"bestFor":["Developers wanting zero-signup, pay-as-you-go API access","AI agents with USDC on Base that need ad-hoc endpoint calls","Projects exploring x402 protocol-based commerce"],"notFor":["Users who need detailed API documentation or guaranteed SLAs before purchasing","High-volume consumers who want bulk pricing or subscription discounts","Anyone without a Base-network USDC wallet"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:20.866Z"},"updatedAt":"2026-04-24T10:32:39.409Z"}}