{"id":"30e22c51-d0df-4378-a591-b0881a4f7bd7","shortId":"DMcbfH","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 offers a suite of pay-per-request APIs accessible via the x402 payment protocol on the Base network. The endpoint at `/api/v1/collections/4` is labeled \"Premium API Access\" and accepts POST requests with payment in USDC (USD Coin) on Base. The x402 challenge indicates a maximum amount of 20,000 base units of USDC (6 decimals), which equals $0.02 per request.\n\nThe provider's landing page advertises four categories of APIs: 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 with no API keys, no rate limits, and no minimum commitments required.\n\nDocumentation beyond the landing page is extremely sparse — the docs, API, pricing, and README pages all render only a \"Connect wallet\" prompt with no substantive content. There is no OpenAPI schema, no request/response examples, and no detailed documentation for any of the endpoints. It is unclear what specific data or functionality the `/api/v1/collections/4` endpoint returns versus the individual category endpoints listed on the homepage.","tags":[],"capabilities":["x402-payment","pay-per-request","usdc-base","data-analytics","ai-inference","sentiment-analysis","text-summarization","classification","embeddings","finance-data","geocoding","utility-apis"],"categories":["ai","data","finance","infrastructure"],"synonyms":["low payment fee","x402 api","pay per call api","micropayment api","base network api","usdc api access","crypto pay api"],"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 and expected input/output of /api/v1/collections/4 is undocumented","Cannot verify whether the advertised AI, finance, and utility endpoints actually function"],"endpointUrl":"https://lowpaymentfee.com/api/v1/collections/4","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/4","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 challenge with clear pricing ($0.02 USDC on Base). However, there is no OpenAPI schema, no request/response examples, and all documentation pages are empty beyond a wallet-connect prompt. The purpose of the specific /collections/4 endpoint is unclear. Effectively a stub 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'/call':19,38 '0.02':18,37,98,149 '000':89 '20':88 '6':94 'accept':69 'access':49,67 'advertis':106 'ai':12,31,118 'ai-inference' 'amount':86 'analysi':122 'analyt':112 'api':5,24,48,66,110,154,174 'base':8,27,57,79,90 'base network api' 'beyond':165 'categori':108,222 'challeng':82 'classif':125 'classification' 'coin':77 'collect':6,25 'commit':162 'connect':183 'content':189 'convers':142 'crypto pay api' 'data':11,30,111,115,212 'data-analytics' 'decim':95 'detail':200 'doc':173 'document':164,201 'embed':126 'embeddings' 'endpoint':16,35,60,145,206,217,223 'equal':97 'estim':136 'exampl':197 'exchang':131 'export':116 'extrem':170 'feed':130 'financ':13,32,127 'finance-data' 'four':107 'function':214 'gas':135 'generat':143 'geocod':140 'geocoding' 'homepag':227 'indic':83 'individu':221 'infrastructur':138 'insight':117 'key':155 'label':64 'land':104,167 'learn':120 'limit':158 'list':147,224 'low payment fee' 'lowpaymentfee.com':39 'machin':119 'maximum':85 'metric':113 'micropayment api' 'minimum':161 'network':58 'offer':40 'openapi':193 'page':105,168,178 'pay':2,21,45 'pay per call api' 'pay-per-request':1,20,44 'payment':53,73 'per':3,22,46,99,150 'post':70 'premium':65 'price':129,175 'prompt':185 'protocol':54 'provid':102 'quot':134 'rate':132,157 'readm':177 'render':180 'report':114 'request':4,23,47,71,100,151 'request/response':196 'requir':163 'return':218 'schema':194 'sentiment':121 'sentiment-analysis' 'spars':171 'specif':211 'substant':188 'suit':42 'summar':124 'text':123 'text-summarization' 'token':133 'unclear':209 'unit':91 'usd':76 'usdc':75,93 'usdc api access' 'usdc-base' 'util':15,34,139 'utility-apis' 'valid':141 'versus':219 'via':9,28,50 'wallet':184 'web3':128 'x402':10,29,52,81 'x402 api' 'x402-payment'","prices":[{"id":"dba76d33-45d3-4ff9-aa3a-2b769d943442","listingId":"30e22c51-d0df-4378-a591-b0881a4f7bd7","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/4","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-19T05:29:55.234Z"}],"sources":[{"listingId":"30e22c51-d0df-4378-a591-b0881a4f7bd7","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/collections/4","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-19T05:29:55.234Z","lastSeenAt":"2026-04-22T02:31:46.381Z"}],"details":{"listingId":"30e22c51-d0df-4378-a591-b0881a4f7bd7","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/collections/4 \\\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 x402 challenge returns maxAmountRequired of 20000 base units of USDC on Base network","source_url":"https://lowpaymentfee.com/api/v1/collections/4"},{"claim":"All endpoints are listed at $0.02 per request with no API keys, no rate limits, and instant access","source_url":"https://lowpaymentfee.com"},{"claim":"Four categories of APIs are advertised: Data & Analytics, AI & Machine Learning, Finance & Web3, and Infrastructure","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset address 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base network","source_url":"https://lowpaymentfee.com/api/v1/collections/4"}],"useCases":["Accessing AI inference endpoints (sentiment, summarization, classification, embeddings) without API key management","Fetching real-time financial data such as token quotes, gas estimates, and exchange rates on a per-request basis","Running data analytics queries and exporting data with instant crypto-settled micropayments","Using utility services like geocoding, validation, and conversion without subscription commitments"],"bestFor":["Developers wanting zero-commitment, pay-as-you-go API access","AI agents that can settle payments autonomously via x402 on Base","Projects needing low-cost micropayment-gated endpoints without rate limits"],"notFor":["Users who need detailed API documentation or OpenAPI specs before integrating","High-volume production workloads that benefit from bulk pricing or SLAs","Developers without access to USDC on the Base network"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:24.272Z"},"updatedAt":"2026-04-22T02:31:46.381Z"}}