{"id":"7f220436-7687-4b70-a203-c816cf10e42a","shortId":"am4Ujc","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 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/143` is listed as \"Premium API Access\" and returns a 402 challenge requesting 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 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 priced at $0.02 per request.\n\nDocumentation is extremely sparse. The docs, API, pricing, 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 description of what the `/api/v1/payments/143` endpoint specifically returns. The endpoint is live (402 challenge confirmed), but without documentation it is unclear what data or functionality this particular route provides.","tags":[],"capabilities":["x402-payment","usdc-base-network","pay-per-request","no-api-key","http-post"],"categories":["api-platform","payments"],"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 — docs, API, pricing, and README pages all show only 'Connect wallet' with no content.","No OpenAPI or schema describing request parameters or response format for /api/v1/payments/143.","The purpose of the specific '/api/v1/payments/143' endpoint is unclear; 'Premium API Access' is the only description provided.","No request or response examples available anywhere in the crawled material."],"endpointUrl":"https://lowpaymentfee.com/api/v1/payments/143","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/143","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, but there is no OpenAPI schema, no request/response examples, and no documentation beyond a wallet-connect prompt. It is impossible to determine what this specific endpoint actually returns. The listing is effectively a 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'/request':12,28 '0.02':11,27,81,152 '000':75 '20':74 '402':69,199 'Base network API' 'USDC micropayment API' 'accept':48 'access':65,95 'across':111 'advertis':86 'ai':121 'analysi':125 'analyt':115 'api':5,14,21,30,40,64,88,161 'attach':98 'base':8,24,53,76 'broader':107 'call':4,20,83 'categori':113 'challeng':70,200 'classif':128 'confirm':201 'connect':170 'content':176 'convers':145 'crypto-paid API' 'data':114,118,209 'descript':187 'doc':160 'document':155,204 'embed':129 'endpoint':57,110,148,192,196 'estim':139 'exampl':184 'exchang':134 'export':119 'extrem':157 'feed':133 'financ':130 'four':112 'function':211 'gas':138 'generat':146 'geocod':143 'header':102 'http-post' 'i.e':80 'infrastructur':141 'insight':120 'instant':94 'key':15,31,89 'learn':123 'limit':92 'list':61 'live':198 'low payment fee API' 'lowpaymentfee' 'lowpaymentfee.com':33 'machin':122 'metric':116 'network':54 'no-api-key' 'offer':109 'openapi':180 'page':165 'particular':213 'pay':2,18,37 'pay-per-cal':1,17 'pay-per-call API' 'pay-per-request':36 'payment':50,101 'per':3,19,38,82,153 'platform':6,22,41,85,108 'premium':63 'price':132,150,162 'prompt':172 'protocol':46 'provid':215 'quot':137 'rate':91,135 'readm':164 'render':167 'report':117 'request':39,71,105,154 'request/response':183 'requir':16,32 'return':67,194 'rout':214 'schema':181 'sentiment':124 'simpli':97 'spars':158 'specif':56,193 'summar':127 'text':126 'token':136 'unclear':207 'unit':77 'usdc':49,79 'usdc-base-network' 'use':43 'util':142 'valid':144 'via':9,25 'wallet':171 'web3':131 'without':203 'x402':10,26,45,100 'x402 API' 'x402-payment'","prices":[{"id":"0bc7208e-cafa-4301-90c0-2efd33cab281","listingId":"7f220436-7687-4b70-a203-c816cf10e42a","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/143","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:49:40.912Z"}],"sources":[{"listingId":"7f220436-7687-4b70-a203-c816cf10e42a","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/payments/143","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:49:40.912Z","lastSeenAt":"2026-04-24T06:32:15.951Z"}],"details":{"listingId":"7f220436-7687-4b70-a203-c816cf10e42a","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/payments/143 \\\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 ($0.02) on Base network.","source_url":"https://lowpaymentfee.com/api/v1/payments/143"},{"claim":"The platform advertises $0.02/request pricing with no API keys, no rate limits, and instant access.","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":"The USDC asset contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913.","source_url":"https://lowpaymentfee.com/api/v1/payments/143"}],"useCases":["Accessing premium API data without managing API keys or subscriptions","Making one-off paid API calls settled in USDC on Base","Agent-driven workflows that need instant, keyless API access with crypto payments"],"bestFor":["Developers who want pay-as-you-go API access without signup","AI agents that can settle x402 payments autonomously","Users already holding USDC on the Base network"],"notFor":["Users who need detailed API documentation or guaranteed SLAs before integrating","Anyone without USDC on the Base network or an x402-compatible client"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:09.193Z"},"updatedAt":"2026-04-24T06:32:15.951Z"}}