{"id":"74ac83f9-a108-4d11-b378-8925e888425c","shortId":"cCYLb7","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 hosts a collection of pay-per-request API endpoints accessible via the x402 payment protocol on the Base network. The specific endpoint at `/api/endpoint-100` is labeled \"Premium API Access\" and accepts POST requests. Payment is settled in USDC (contract 0x8335…2913 on Base) with a maximum amount of 20,000 base units, which equals $0.02 per call (USDC uses 6 decimals). No API keys or rate limits are advertised — callers simply attach an X-PAYMENT header with a valid x402 payment proof.\n\nThe broader platform advertises 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 listed endpoints are priced at $0.02 per request. However, the specific endpoint probed here (`/api/endpoint-100`) does not map to any of the named endpoints on the landing page, so its exact functionality is unclear.\n\nDocumentation is extremely sparse — the /docs, /api, /pricing, and /README pages all returned only a \"Connect wallet\" prompt with no substantive content. There is no OpenAPI schema, no request/response examples, and no detailed description of what `/api/endpoint-100` actually returns. The x402 challenge is live and well-formed, confirming the endpoint is operational, but without documentation it is difficult to know what data or service it provides.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","pay-per-request","http-post"],"categories":["api-platform","crypto"],"synonyms":["x402 API","micropayment API","USDC pay-per-call","Base network API","lowpaymentfee","crypto API access","402 payment protocol"],"warnings":["No documentation available — /docs, /api, /pricing, /README all return only 'Connect wallet' with no content.","The endpoint path /api/endpoint-100 does not correspond to any named endpoint on the landing page; its actual functionality is unknown.","No OpenAPI schema or request/response examples are provided.","No information on uptime, SLAs, or data sources."],"endpointUrl":"https://lowpaymentfee.com/api/endpoint-100","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/endpoint-100","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.300","qualityRationale":"The x402 challenge is live and pricing is clear ($0.02 USDC on Base), but there is no documentation, no OpenAPI schema, no request/response examples, and the specific endpoint's functionality is unknown. The docs pages are all empty wallet-connect 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'/api/endpoint-100':56,172,228 '/docs':197 '/pricing':199 '/readme':201 '/request':13,28 '0.02':12,27,87,163 '000':82 '0x8335':72 '20':81 '2913':73 '402 payment protocol' '6':92 'Base network API' 'USDC pay-per-call' 'accept':63 'access':42,61 'across':121 'actual':229 'advertis':101,119 'ai':131 'amount':79 'analysi':135 'analyt':125 'api':5,20,40,60,95 'attach':104 'base':8,23,50,75,83 'base-network' 'broader':117 'call':4,19,89 'caller':102 'categori':123 'challeng':233 'classif':138 'collect':34 'confirm':240 'connect':207 'content':213 'contract':71 'convers':155 'crypto API access' 'data':124,128,254 'decim':93 'descript':225 'detail':224 'difficult':250 'document':192,247 'embed':139 'endpoint':41,54,120,159,169,181,242 'equal':86 'estim':149 'exact':188 'exampl':221 'exchang':144 'export':129 'extrem':194 'feed':143 'financ':140 'form':239 'four':122 'function':189 'gas':148 'generat':156 'geocod':153 'header':109 'host':32 'howev':166 'http-post' 'infrastructur':151 'insight':130 'key':96 'know':252 'label':58 'land':184 'learn':133 'limit':99 'list':158 'live':235 'lowpaymentfee' 'lowpaymentfee.com':31 'machin':132 'map':175 'maximum':78 'metric':126 'micropayment API' 'name':180 'network':9,24,51 'openapi':217 'oper':244 'page':185,202 'pay':2,17,37 'pay-per-cal':1,16 'pay-per-request':36 'payment':46,66,108,114 'per':3,18,38,88,164 'platform':6,21,118 'post':64 'premium':59 'price':142,161 'probe':170 'prompt':209 'proof':115 'protocol':47 'provid':258 'quot':147 'rate':98,145 'report':127 'request':39,65,165 'request/response':220 'return':204,230 'schema':218 'sentiment':134 'servic':256 'settl':68 'simpli':103 'spars':195 'specif':53,168 'substant':212 'summar':137 'text':136 'token':146 'unclear':191 'unit':84 'usdc':15,30,70,90 'usdc-settlement' 'use':91 'util':152 'valid':112,154 'via':10,25,43 'wallet':208 'web3':141 'well':238 'well-form':237 'without':246 'x':107 'x-payment':106 'x402':11,26,45,113,232 'x402 API' 'x402-payment'","prices":[{"id":"d6debb4b-a120-4362-b221-39e2294cff2f","listingId":"74ac83f9-a108-4d11-b378-8925e888425c","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/endpoint-100","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:37:32.522Z"}],"sources":[{"listingId":"74ac83f9-a108-4d11-b378-8925e888425c","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/endpoint-100","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:37:32.522Z","lastSeenAt":"2026-04-24T08:02:35.994Z"}],"details":{"listingId":"74ac83f9-a108-4d11-b378-8925e888425c","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/endpoint-100 \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402-payment-proof>\" \\\n  -d '{}'","exampleRequest":null,"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"The x402 challenge returns maxAmountRequired of 20000 base units in USDC on Base network","source_url":"https://lowpaymentfee.com/api/endpoint-100"},{"claim":"All listed endpoints are priced at $0.02 per request with no API keys, no rate limits, and instant access","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset contract is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base","source_url":"https://lowpaymentfee.com/api/endpoint-100"},{"claim":"Platform offers endpoints in Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"}],"useCases":["Agent-driven API consumption with per-call USDC micropayments","Accessing data or AI inference endpoints without API key registration","Programmatic pay-as-you-go API usage on Base L2"],"bestFor":["Developers wanting keyless, pay-per-call API access","AI agents with x402-compatible payment wallets","Users who prefer crypto micropayments over subscription billing"],"notFor":["Users needing detailed API documentation or guaranteed SLAs","Applications requiring free or high-volume bulk access at discounted rates"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:44.65Z"},"updatedAt":"2026-04-24T08:02:35.994Z"}}