{"id":"332aa7cb-93cc-47ce-b2b7-fdff84ac9f93","shortId":"J3s8w9","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/243` is labeled \"Premium API Access\" and charges up to $0.02 per call (20,000 base units of USDC with 6 decimals). The platform advertises no API keys, no rate limits, and instant access — callers simply attach an X-PAYMENT header with a valid x402 payment proof.\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 $0.02 per request.\n\nThis particular endpoint (`/api/v1/payments/243`) is live and returned a proper 402 challenge when probed. However, the crawled documentation pages (docs, pricing, API, README) all returned only a \"Connect wallet\" prompt with no substantive content, so the actual functionality behind this specific endpoint is unclear. There is no OpenAPI schema, no request/response examples, and no detailed documentation available from the crawl.","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","premium API access","crypto-paid API"],"warnings":["No documentation available — all doc/pricing/API/README pages returned only 'Connect wallet' with no content.","The specific functionality of /api/v1/payments/243 ('Premium API Access') is not described; it is unclear what this endpoint actually does.","No OpenAPI schema or request/response examples are provided.","The platform lists many endpoint categories (AI, finance, analytics, infrastructure) but none have documented schemas or verifiable functionality."],"endpointUrl":"https://lowpaymentfee.com/api/v1/payments/243","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/243","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 documentation content (all doc pages show only 'Connect wallet'), no request/response examples, and the actual functionality behind '/api/v1/payments/243' is not described anywhere. The listing is effectively a 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'/request':12,28 '0.02':11,27,69,153 '000':73 '20':72 '402':166 '6':79 'Base network API' 'USDC micropayment API' 'accept':48 'access':64,92 'across':112 'actual':192 'advertis':83 'ai':122 'analysi':126 'analyt':116 'api':5,14,21,30,40,63,85,177 'attach':95 'avail':212 'base':8,24,53,74 'behind':194 'broader':108 'call':4,20,71 'caller':93 'categori':114 'challeng':167 'charg':66 'classif':129 'connect':183 'content':189 'convers':146 'crawl':172,215 'crypto-paid API' 'data':115,119 'decim':80 'detail':210 'doc':175 'document':173,211 'embed':130 'endpoint':57,111,149,158,197 'estim':140 'exampl':207 'exchang':135 'export':120 'feed':134 'financ':131 'four':113 'function':193 'gas':139 'generat':147 'geocod':144 'header':100 'howev':170 'http-post' 'infrastructur':142 'insight':121 'instant':91 'key':15,31,86 'label':61 'learn':124 'limit':89 'list':151 'live':161 'lowpaymentfee' 'lowpaymentfee.com':33 'machin':123 'metric':117 'network':54 'no-api-key' 'offer':110 'openapi':203 'page':174 'particular':157 'pay':2,18,37 'pay-per-cal':1,17 'pay-per-call API' 'pay-per-request':36 'payment':50,99,105 'per':3,19,38,70,154 'platform':6,22,41,82,109 'premium':62 'premium API access' 'price':133,176 'probe':169 'prompt':185 'proof':106 'proper':165 'protocol':46 'quot':138 'rate':88,136 'readm':178 'report':118 'request':39,155 'request/response':206 'requir':16,32 'return':163,180 'schema':204 'sentiment':125 'simpli':94 'specif':56,196 'substant':188 'summar':128 'text':127 'token':137 'unclear':199 'unit':75 'usdc':49,77 'usdc-base-network' 'use':43 'util':143 'valid':103,145 'via':9,25 'wallet':184 'web3':132 'x':98 'x-payment':97 'x402':10,26,45,104 'x402 API' 'x402-payment'","prices":[{"id":"0dabcf9e-1afe-4d28-bdca-4f6c6c537443","listingId":"332aa7cb-93cc-47ce-b2b7-fdff84ac9f93","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/243","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:50:03.309Z"}],"sources":[{"listingId":"332aa7cb-93cc-47ce-b2b7-fdff84ac9f93","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/payments/243","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:50:03.309Z","lastSeenAt":"2026-04-24T03:03:25.075Z"}],"details":{"listingId":"332aa7cb-93cc-47ce-b2b7-fdff84ac9f93","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/payments/243 \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402-payment-proof>\"","exampleRequest":null,"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"The endpoint returns a 402 challenge with maxAmountRequired of 20000 base units of USDC on Base network","source_url":"https://lowpaymentfee.com/api/v1/payments/243"},{"claim":"All 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 offers endpoints across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset address is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base","source_url":"https://lowpaymentfee.com/api/v1/payments/243"}],"useCases":["Accessing premium API endpoints without traditional API key registration","Making one-off API calls paid per request via USDC on Base","Agent-driven workflows that need frictionless, keyless API access"],"bestFor":["Developers who want pay-as-you-go API access without subscriptions","AI agents that can settle x402 payments autonomously","Users already holding USDC on the Base network"],"notFor":["Users who need detailed API documentation or OpenAPI specs before integrating","High-volume callers who would benefit from bulk pricing or subscriptions","Developers without access to USDC on the Base network"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:08.118Z"},"updatedAt":"2026-04-24T03:03:25.075Z"}}