{"id":"776b24a8-65c7-462a-95f9-4138aff6664b","shortId":"Sg7Yqp","kind":"x402","title":"Pay-per-call API platform on Base offering data, AI, finance, and utility endpoints at $0.02 each via x402.","tagline":"Pay-per-call API platform on Base offering data, AI, finance, and utility endpoints at $0.02 each via x402.","description":"lowpaymentfee.com is an x402-enabled API marketplace that exposes a broad set of 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, paid in USDC on the Base network with no API keys, no rate limits, and no minimum commitments.\n\nThe specific endpoint at `/api/v1/invoices/26` is listed as \"Premium API Access\" and returns a valid x402 challenge with a maxAmountRequired of 20,000 base units of USDC (0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913), which equals $0.02 given USDC's 6 decimals. Payment is made via the \"exact\" scheme on the Base network to address 0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3, with a 300-second timeout. The endpoint accepts POST requests and returns application/json.\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 further content. There is no OpenAPI spec, no request/response schema documentation, and no example payloads available. The exact functionality behind the `/api/v1/invoices/26` path is unclear; it may be an invoice lookup or a generic premium access gate. Without documentation, callers will need to experiment to determine the expected request body and response format.","tags":[],"capabilities":["x402-payment","usdc-base","pay-per-request","data-analytics","ai-inference","sentiment-analysis","text-summarization","classification","embeddings","finance-data","exchange-rates","gas-estimates","geocoding","validation","conversion"],"categories":["api-marketplace","llm","finance","geo"],"synonyms":["low payment fee","x402 api","pay per call api","micropayment api","base network api","usdc api","data analytics api","ai inference api"],"warnings":["No API documentation available — /docs, /api, /pricing, and /README all render only a wallet-connect prompt","No OpenAPI or schema definition found for any endpoint","The purpose and expected request body for /api/v1/invoices/26 specifically is unclear — it may differ from the other listed endpoints","No example request or response payloads are available anywhere in the crawled content"],"endpointUrl":"https://lowpaymentfee.com/api/v1/invoices/26","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/invoices/26","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.350","qualityRationale":"The x402 challenge is live and well-formed, confirming the endpoint works and pricing is clear ($0.02 USDC on Base). However, documentation is essentially nonexistent beyond the landing page listing; no OpenAPI spec, no request/response schemas, no examples, and the specific purpose of /api/v1/invoices/26 is ambiguous. This is effectively a stub 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'/api/v1/invoices/26':122,226 '/docs':190 '/pricing':192 '/readme':194 '0.02':17,37,97,148 '000':140 '0x1a2b13e97f5f837c8f9fa1f95a1484b7c70d85f3':167 '0x833589fcd6edb6e08f4c7c32d4f71b54bda02913':145 '20':139 '300':170 '6':152 'accept':175 'access':128,240 'across':56 'address':166 'ai':11,31,66 'ai inference api' 'ai-inference' 'analysi':70 'analyt':60 'api':5,25,47,109,127 'application/json':180 'avail':220 'base':8,28,105,141,163 'base network api' 'behind':224 'beyond':182 'bodi':254 'broad':52 'call':4,24 'caller':244 'categori':58 'challeng':134 'classif':73 'classification' 'commit':117 'connect':200 'content':206 'convers':90 'conversion' 'data':10,30,59,63 'data analytics api' 'data-analytics' 'decim':153 'determin':250 'document':181,215,243 'embed':74 'embeddings' 'enabl':46 'endpoint':15,35,55,93,120,174 'equal':147 'estim':84 'exact':159,222 'exampl':218 'exchang':79 'exchange-rates' 'expect':252 'experi':248 'export':64 'expos':50 'extrem':187 'feed':78 'financ':12,32,75 'finance-data' 'format':257 'four':57 'function':223 'gas':83 'gas-estimates' 'gate':241 'generat':91 'generic':238 'geocod':88 'geocoding' 'given':149 'infrastructur':86 'insight':65 'invoic':234 'key':110 'land':184 'learn':68 'limit':113 'list':124 'lookup':235 'low payment fee' 'lowpaymentfee.com':41 'machin':67 'made':156 'marketplac':48 'maxamountrequir':137 'may':231 'metric':61 'micropayment api' 'minimum':116 'need':246 'network':106,164 'offer':9,29 'openapi':210 'page':185,195 'paid':100 'path':227 'pay':2,22 'pay per call api' 'pay-per-cal':1,21 'pay-per-request' 'payload':219 'payment':154 'per':3,23,98 'platform':6,26 'post':176 'premium':126,239 'price':77,95 'prompt':202 'quot':82 'rate':80,112 'render':197 'report':62 'request':99,177,253 'request/response':213 'respons':256 'return':130,179 'schema':214 'scheme':160 'second':171 'sentiment':69 'sentiment-analysis' 'set':53 'spars':188 'spec':211 'specif':119 'summar':72 'text':71 'text-summarization' 'timeout':172 'token':81 'unclear':229 'unit':142 'usdc':102,144,150 'usdc api' 'usdc-base' 'util':14,34,87 'valid':89,132 'validation' 'via':19,39,157 'wallet':201 'web3':76 'without':242 'x402':20,40,45,133 'x402 api' 'x402-enabled':44 'x402-payment'","prices":[{"id":"817f2ba5-b3dc-4da3-8190-a1892777d59d","listingId":"776b24a8-65c7-462a-95f9-4138aff6664b","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/invoices/26","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:37:20.916Z"}],"sources":[{"listingId":"776b24a8-65c7-462a-95f9-4138aff6664b","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/invoices/26","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:37:20.916Z","lastSeenAt":"2026-04-23T13:30:32.460Z"}],"details":{"listingId":"776b24a8-65c7-462a-95f9-4138aff6664b","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/invoices/26 \\\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":"All endpoints 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":"x402 challenge returns maxAmountRequired of 20000 base units of USDC (asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base network","source_url":"https://lowpaymentfee.com/api/v1/invoices/26"},{"claim":"Available API categories include Data & Analytics, AI & Machine Learning, Finance & Web3, and Infrastructure","source_url":"https://lowpaymentfee.com"},{"claim":"Documentation pages (/docs, /api, /pricing, /README) render only a Connect wallet prompt","source_url":"https://lowpaymentfee.com/docs"}],"useCases":["Accessing AI inference endpoints (sentiment, summarization, classification, embeddings) without API key management","Fetching real-time finance data such as token quotes, gas estimates, and exchange rates on a per-call basis","Running data analytics queries and exporting data with per-request micropayments","Using utility services like geocoding and validation without subscription commitments"],"bestFor":["Agents or developers who want zero-signup, pay-as-you-go API access","Use cases requiring low-cost micropayment-gated endpoints on Base","Projects already holding USDC on Base that need quick access to diverse utility APIs"],"notFor":["Production workloads requiring documented request/response schemas and SLAs","Users without USDC on the Base network or unfamiliar with x402 payment flows","High-volume use cases where $0.02 per request adds up significantly"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:45.164Z"},"updatedAt":"2026-04-23T13:30:32.460Z"}}