{"id":"7e9a40a7-75d7-42cc-a73c-c1ea8c5fb0c3","shortId":"cqfLDv","kind":"x402","title":"Pay-per-request API collection on Base via x402 — data, AI, finance, and utility endpoints at $0.02/call.","tagline":"Pay-per-request API collection on Base via x402 — data, AI, finance, and utility endpoints at $0.02/call.","description":"lowpaymentfee.com hosts a collection of pay-per-request API endpoints accessible via the x402 payment protocol on the Base network. The specific endpoint at `/api/v1/collections/41` is labeled \"Premium API Access\" and charges up to 20,000 base units of USDC (0x8335…2913 on Base), which equals $0.02 per request. Payment is settled on-chain with no API keys, no rate limits, and no subscriptions required.\n\nThe broader platform advertises four categories of endpoints: 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\nDocumentation is extremely sparse — the docs, pricing, API, and README pages all render only a \"Connect wallet\" prompt with no further content. There is no OpenAPI schema, no request/response examples, and no detailed documentation available from the crawl. The `/api/v1/collections/41` endpoint itself is live and returns a valid x402 402 challenge, confirming it accepts POST requests and pays out to address 0x1A2B…85F3. Without documentation, the actual request body format and response structure for this specific collections endpoint remain unknown.","tags":[],"capabilities":["x402-payment","pay-per-request","usdc-base","no-api-key","post-endpoint","data-analytics","ai-inference","finance-data","utility-services"],"categories":["api-marketplace","data","llm"],"synonyms":["x402 API","pay per call API","USDC API","Base network API","micropayment API","lowpaymentfee","crypto API access","on-chain API payment"],"warnings":["No documentation available — all doc/pricing/README pages render only 'Connect wallet'","No OpenAPI or schema provided; request and response formats are unknown","The specific purpose of /api/v1/collections/41 vs. the individually listed endpoints is unclear","No SLA, rate limit, or uptime guarantees documented"],"endpointUrl":"https://lowpaymentfee.com/api/v1/collections/41","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/collections/41","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.350","qualityRationale":"The endpoint is live and returns a valid x402 402 challenge, confirming it works. However, documentation is essentially nonexistent — all doc pages show only 'Connect wallet'. There is no OpenAPI schema, no request/response examples, and the purpose of the '/collections/41' endpoint specifically is unclear beyond the generic 'Premium API Access' 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'/call':19,38 '/request':155 '0.02':18,37,86,154 '000':75 '0x1a2b':219 '0x8335':80 '20':74 '2913':81 '402':207 '85f3':220 'Base network API' 'USDC API' 'accept':211 'access':50,69 'actual':224 'address':218 'advertis':109 'ai':12,31,121 'ai-inference' 'analysi':125 'analyt':115 'api':5,24,48,68,97,165 'avail':192 'base':8,27,58,76,83 'bodi':226 'broader':107 'categori':111 'chain':94 'challeng':208 'charg':71 'classif':128 'collect':6,25,42,234 'confirm':209 'connect':173 'content':179 'convers':145 'crawl':195 'crypto API access' 'data':11,30,114,118 'data-analytics' 'detail':190 'doc':163 'document':158,191,222 'embed':129 'endpoint':16,35,49,62,113,148,198,235 'equal':85 'estim':139 'exampl':187 'exchang':134 'export':119 'extrem':160 'feed':133 'financ':13,32,130 'finance-data' 'format':227 'four':110 'gas':138 'generat':146 'geocod':143 'host':40 'infrastructur':141 'insight':120 'key':98 'label':66 'learn':123 'limit':101 'list':150 'live':201 'lowpaymentfee' 'lowpaymentfee.com':39 'machin':122 'metric':116 'micropayment API' 'network':59 'no-api-key' 'on-chain':92 'on-chain API payment' 'openapi':183 'page':168 'pay':2,21,45,215 'pay per call API' 'pay-per-request':1,20,44 'payment':54,89 'per':3,22,46,87 'platform':108 'point':157 'post':212 'post-endpoint' 'premium':67 'price':132,156,164 'prompt':175 'protocol':55 'quot':137 'rate':100,135 'readm':167 'remain':236 'render':170 'report':117 'request':4,23,47,88,213,225 'request/response':186 'requir':105 'respons':229 'return':203 'schema':184 'sentiment':124 'settl':91 'spars':161 'specif':61,233 'structur':230 'subscript':104 'summar':127 'text':126 'token':136 'unit':77 'unknown':237 'usdc':79 'usdc-base' 'util':15,34,142 'utility-services' 'valid':144,205 'via':9,28,51 'wallet':174 'web3':131 'without':221 'x402':10,29,53,206 'x402 API' 'x402-payment'","prices":[{"id":"ffd91744-2a8e-4970-baa6-b6405585ed47","listingId":"7e9a40a7-75d7-42cc-a73c-c1ea8c5fb0c3","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/collections/41","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-19T05:29:48.770Z"}],"sources":[{"listingId":"7e9a40a7-75d7-42cc-a73c-c1ea8c5fb0c3","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/collections/41","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-19T05:29:48.770Z","lastSeenAt":"2026-04-22T08:31:59.079Z"}],"details":{"listingId":"7e9a40a7-75d7-42cc-a73c-c1ea8c5fb0c3","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/collections/41 \\\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 valid x402 402 challenge with maxAmountRequired of 20000 base units of USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/collections/41"},{"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 offers endpoints across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"},{"claim":"USDC contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 with 6 decimals, making 20000 base units = $0.02","source_url":"https://lowpaymentfee.com/api/v1/collections/41"}],"useCases":["Accessing data analytics and reports without managing API keys or subscriptions","Running AI inference tasks (sentiment, summarization, classification, embeddings) with per-call crypto payment","Fetching real-time finance data like exchange rates, token quotes, and gas estimates","Using utility services like geocoding, validation, and conversion on demand"],"bestFor":["Developers who want instant API access without signup or API key management","Agents and bots that can settle micropayments in USDC on Base","Low-volume or sporadic API consumers who prefer pay-per-use over subscriptions"],"notFor":["High-volume production workloads where $0.02/request adds up significantly","Users who need detailed documentation, SLAs, or guaranteed uptime","Developers without a Base-compatible wallet or USDC holdings"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:24.638Z"},"updatedAt":"2026-04-22T08:31:59.079Z"}}