{"id":"307f6ea1-533d-4eac-92c4-0e22812602f8","shortId":"cCfCEF","kind":"x402","title":"Pay-per-call premium API access on Base via x402 protocol at $0.02/request in USDC.","tagline":"Pay-per-call premium API access on Base via x402 protocol at $0.02/request in USDC.","description":"lowpaymentfee.com offers a suite of pay-per-request APIs accessible via the x402 payment protocol on the Base network. The specific endpoint `/api/v1/transactions/101` is labeled \"Premium API Access\" and requires a payment of up to 20,000 base units of USDC (0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913), which equals $0.02 per request (USDC uses 6 decimals). No API keys, rate limits, or subscriptions are needed—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 endpoints are listed at the same $0.02/request price point and settle on Base using USDC.\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 technical detail. There is no OpenAPI spec, no example request/response payloads, and no description of what the `/api/v1/transactions/101` endpoint actually returns. The endpoint is confirmed live (returns a proper 402 x402 challenge), but the lack of documentation makes it difficult to determine the actual functionality behind this specific route.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","pay-per-request","no-api-key","no-rate-limit","json-response"],"categories":["finance","infrastructure"],"synonyms":["x402 API","micropayment API","pay-per-call","USDC API","Base network API","lowpaymentfee","premium API access","crypto payment API"],"warnings":["No OpenAPI or schema documentation available","The /docs, /pricing, /api, and /README pages are all empty (only show 'Connect wallet')","The specific functionality of /api/v1/transactions/101 is undocumented—unclear what data it returns","No example request or response payloads available anywhere in crawled content"],"endpointUrl":"https://lowpaymentfee.com/api/v1/transactions/101","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/transactions/101","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.350","qualityRationale":"The endpoint is confirmed live with a valid 402 x402 challenge, and the landing page provides basic pricing and category info. However, there is no OpenAPI spec, no documentation, no example requests/responses, and the specific functionality of /api/v1/transactions/101 is entirely undocumented. This is effectively a stub 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'/api/v1/transactions/101':58,210 '/docs':177 '/pricing':179 '/readme':181 '/request':15,32,159 '0.02':14,31,80,158 '000':72 '0x833589fcd6edb6e08f4c7c32d4f71b54bda02913':77 '20':71 '402':222 '6':85 'Base network API' 'USDC API' 'access':7,24,45,63 'across':115 'actual':212,236 'advertis':113 'ai':125 'analysi':129 'analyt':119 'api':6,23,44,62,88 'attach':98 'base':9,26,53,73,165 'base-network' 'behind':238 'beyond':169 'broader':111 'call':4,21 'caller':96 'categori':117 'challeng':224 'classif':132 'confirm':217 'connect':187 'convers':149 'crypto payment API' 'data':118,122 'decim':86 'descript':206 'detail':194 'determin':234 'difficult':232 'document':168,229 'embed':133 'endpoint':57,114,152,211,215 'equal':79 'estim':143 'exampl':201 'exchang':138 'export':123 'extrem':174 'feed':137 'financ':134 'four':116 'function':237 'gas':142 'generat':150 'geocod':147 'header':103 'infrastructur':145 'insight':124 'json-response' 'key':89 'label':60 'lack':227 'land':171 'learn':127 'limit':91 'list':154 'live':218 'lowpaymentfee' 'lowpaymentfee.com':35 'machin':126 'make':230 'metric':120 'micropayment API' 'need':95 'network':54 'no-api-key' 'no-rate-limit' 'offer':36 'openapi':198 'page':172,182 'pay':2,19,41 'pay-per-cal':1,18 'pay-per-call' 'pay-per-request':40 'payload':203 'payment':49,67,102,108 'per':3,20,42,81 'platform':112 'point':161 'premium':5,22,61 'premium API access' 'price':136,160 'prompt':189 'proof':109 'proper':221 'protocol':12,29,50 'quot':141 'rate':90,139 'render':184 'report':121 'request':43,82 'request/response':202 'requir':65 'return':213,219 'rout':241 'sentiment':128 'settl':163 'simpli':97 'spars':175 'spec':199 'specif':56,240 'subscript':93 'suit':38 'summar':131 'technic':193 'text':130 'token':140 'unit':74 'usdc':17,34,76,83,167 'usdc-settlement' 'use':84,166 'util':146 'valid':106,148 'via':10,27,46 'wallet':188 'web3':135 'x':101 'x-payment':100 'x402':11,28,48,107,223 'x402 API' 'x402-payment'","prices":[{"id":"1e7be32a-2265-4e1b-bfab-a61cd73c7058","listingId":"307f6ea1-533d-4eac-92c4-0e22812602f8","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/transactions/101","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:58:18.890Z"}],"sources":[{"listingId":"307f6ea1-533d-4eac-92c4-0e22812602f8","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/transactions/101","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:58:18.890Z","lastSeenAt":"2026-04-25T01:32:59.586Z"}],"details":{"listingId":"307f6ea1-533d-4eac-92c4-0e22812602f8","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/transactions/101 \\\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":"Endpoint returns 402 with x402 challenge requiring up to 20000 base units of USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/transactions/101"},{"claim":"USDC asset contract is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base","source_url":"https://lowpaymentfee.com/api/v1/transactions/101"},{"claim":"All endpoints priced at $0.02/request with no API keys, no rate limits, instant access on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"Platform offers APIs across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"}],"useCases":["Programmatic access to premium data or services without subscription commitments","Agent-driven workflows that need instant API access without credential provisioning","Demonstrating x402 payment protocol integration on Base"],"bestFor":["Developers experimenting with x402 payment flows","AI agents needing credential-free API access","Low-volume or sporadic API consumers who prefer pay-per-use"],"notFor":["Users needing detailed API documentation or guaranteed SLAs","High-volume consumers who would benefit from bulk pricing or subscriptions","Anyone without a Base-compatible USDC wallet"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:44.487Z"},"updatedAt":"2026-04-25T01:32:59.586Z"}}