{"id":"95cc7610-3591-49c3-ad1e-8b691927a417","shortId":"tf6V7M","kind":"x402","title":"Pay-per-call transaction receipt endpoint on Base via x402, settling in USDC at $0.02/request.","tagline":"Pay-per-call transaction receipt endpoint on Base via x402, settling in USDC at $0.02/request.","description":"This x402-enabled endpoint at lowpaymentfee.com provides a \"Premium API Access\" transaction receipt resource. When called via POST at `/api/v1/transactions/400/receipt`, it returns a JSON response after receiving a valid x402 payment header. The endpoint settles on the Base network using USDC (contract 0x8335…2913) with a maximum amount of 20,000 base units, which equals $0.02 USD (USDC uses 6 decimals). No API keys or rate limits are required — access is gated purely by micropayment.\n\nThe broader lowpaymentfee.com platform advertises a suite of pay-per-call APIs 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 with the same x402 payment model on Base.\n\nThis specific endpoint (`/api/v1/transactions/400/receipt`) appears to serve transaction receipt data, though the exact response schema is not documented. The probe confirms the endpoint is live, returning a proper 402 challenge with x402 version 1. Documentation pages on the site are minimal — the docs, API, pricing, and README pages all render only a \"Connect wallet\" prompt with no further technical detail.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","transaction-receipt","pay-per-call","no-api-key","json-response"],"categories":["finance","infrastructure"],"synonyms":["transaction receipt API","x402 micropayment endpoint","USDC pay-per-call","Base network API","lowpaymentfee","crypto payment API","402 payment required"],"warnings":["No response schema or example response documented anywhere","All documentation pages (docs, API, pricing, README) render only 'Connect wallet' with no technical content","The specific purpose of /api/v1/transactions/400/receipt is unclear — it may be a demo or placeholder endpoint","No OpenAPI spec or machine-readable schema available"],"endpointUrl":"https://lowpaymentfee.com/api/v1/transactions/400/receipt","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/400/receipt","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 via a valid 402 challenge, and pricing is clear ($0.02 USDC on Base). However, there is no documentation of the request body, response schema, or what 'transaction 400 receipt' actually returns. The docs/pricing/README pages are all blank beyond a wallet connect prompt. This is effectively a stub listing with minimal usable 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'/request':17,34 '0.02':16,33,91,165 '000':86 '0x8335':78 '1':209 '20':85 '2913':79 '402':204 '402 payment required' '6':95 'Base network API' 'USDC pay-per-call' 'access':46,105 'across':124 'advertis':115 'ai':134 'amount':83 'analysi':138 'analyt':128 'api':45,98,123,219 'appear':180 'base':9,26,73,87,175 'base-network' 'broader':112 'call':4,21,51,122 'categori':126 'challeng':205 'classif':141 'confirm':196 'connect':228 'contract':77 'convers':158 'crypto payment API' 'data':127,131,185 'decim':96 'detail':235 'doc':218 'document':193,210 'embed':142 'enabl':38 'endpoint':7,24,39,69,161,178,198 'equal':90 'estim':152 'exact':188 'exchang':147 'export':132 'feed':146 'financ':143 'four':125 'gas':151 'gate':107 'generat':159 'geocod':156 'header':67 'infrastructur':154 'insight':133 'json':59 'json-response' 'key':99 'learn':136 'limit':102 'list':163 'live':200 'lowpaymentfee' 'lowpaymentfee.com':41,113 'machin':135 'maximum':82 'metric':129 'micropay':110 'minim':216 'model':173 'network':74 'no-api-key' 'page':211,223 'pay':2,19,120 'pay-per-cal':1,18,119 'pay-per-call' 'payment':66,172 'per':3,20,121,166 'platform':114 'post':53 'premium':44 'price':145,220 'probe':195 'prompt':230 'proper':203 'provid':42 'pure':108 'quot':150 'rate':101,148 'readm':222 'receipt':6,23,48,184 'receiv':62 'render':225 'report':130 'request':167 'requir':104 'resourc':49 'respons':60,189 'return':57,201 'schema':190 'sentiment':137 'serv':182 'settl':12,29,70 'site':214 'specif':177 'suit':117 'summar':140 'technic':234 'text':139 'though':186 'token':149 'transact':5,22,47,183 'transaction receipt API' 'transaction-receipt' 'unit':88 'usd':92 'usdc':14,31,76,93 'usdc-settlement' 'use':75,94 'util':155 'valid':64,157 'version':208 'via':10,27,52 'wallet':229 'web3':144 'x402':11,28,37,65,171,207 'x402 micropayment endpoint' 'x402-enabled':36 'x402-payment'","prices":[{"id":"eada2627-0cd8-4110-b492-c8142adf9c9d","listingId":"95cc7610-3591-49c3-ad1e-8b691927a417","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/400/receipt","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T19:26:50.839Z"}],"sources":[{"listingId":"95cc7610-3591-49c3-ad1e-8b691927a417","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/transactions/400/receipt","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T19:26:50.839Z","lastSeenAt":"2026-04-24T04:04:20.328Z"}],"details":{"listingId":"95cc7610-3591-49c3-ad1e-8b691927a417","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/transactions/400/receipt \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402-payment-token>\"","exampleRequest":null,"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"Endpoint returns 402 with x402 version 1 challenge requiring USDC payment on Base network","source_url":"https://lowpaymentfee.com/api/v1/transactions/400/receipt"},{"claim":"maxAmountRequired is 20000 base units of USDC (0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913), equaling $0.02","source_url":"https://lowpaymentfee.com/api/v1/transactions/400/receipt"},{"claim":"Platform advertises $0.02/request pricing with no API keys, no rate limits, and instant access on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"Platform lists APIs across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"}],"useCases":["Retrieving transaction receipt data for a specific transaction ID via micropayment","Integrating pay-per-call receipt lookups into agent workflows without API key management","Demonstrating x402 protocol payment flows on the Base network"],"bestFor":["Agents needing on-demand transaction receipts without subscription commitments","Developers exploring x402 micropayment-gated APIs","Low-volume or sporadic access patterns where per-call pricing is economical"],"notFor":["High-volume bulk transaction data retrieval where subscription pricing would be cheaper","Users who need detailed API documentation or response schema guarantees before integrating","Non-crypto-native consumers who cannot produce x402 payment headers"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:36.78Z"},"updatedAt":"2026-04-24T04:04:20.328Z"}}