{"id":"545250b5-0fb4-4691-88e9-57713b3ef6fb","shortId":"UMNGQS","kind":"x402","title":"Pay-per-call transaction receipt endpoint on Base via x402, settled in USDC at $0.02/request.","tagline":"Pay-per-call transaction receipt endpoint on Base via x402, settled in USDC at $0.02/request.","description":"This x402-enabled endpoint at lowpaymentfee.com provides a transaction receipt resource at `/api/v1/transactions/122/receipt`. It is part of a broader platform offering multiple API categories — data & analytics, AI & machine learning, finance & Web3, and infrastructure utilities — all priced at $0.02 per request with no API keys, no rate limits, and no commitments required.\n\nThe specific endpoint probed returns a 402 Payment Required challenge requesting payment of 20,000 base units of USDC (0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on the Base network. Since USDC uses 6 decimals, this equals $0.02 per call, consistent with the site's advertised pricing. Payment is made via the x402 exact scheme, with a 300-second timeout. The endpoint accepts POST requests and returns `application/json`.\n\nThe platform's landing page lists 16 endpoints across four categories, all at the same $0.02 price point. However, documentation pages (`/docs`, `/pricing`, `/api`, `/README`) all returned only a \"Connect wallet\" prompt with no substantive content. There is no OpenAPI spec, no request/response schema documentation, and no examples available. The actual data or functionality behind this particular receipt endpoint is unclear — it could return a transaction receipt for a specific resource ID (122), but without documentation or sample responses this is speculative.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","pay-per-call","no-api-key","transaction-receipt","json-response"],"categories":["finance","infrastructure"],"synonyms":["transaction receipt API","x402 payment endpoint","USDC micropayment API","Base network API","pay-per-request API","lowpaymentfee","crypto payment API"],"warnings":["No API documentation available — /docs, /pricing, /api, and /README all return only a 'Connect wallet' prompt with no content","No OpenAPI or schema definition found for any endpoint","No example request or response bodies available","The specific functionality of /api/v1/transactions/122/receipt is undocumented and unclear — the hardcoded ID '122' suggests this may be a demo or placeholder resource"],"endpointUrl":"https://lowpaymentfee.com/api/v1/transactions/122/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/122/receipt","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 402 challenge with clear pricing. However, there is no OpenAPI spec, no request/response schema, and all documentation pages are empty stubs showing only 'Connect wallet'. The purpose and output of this specific receipt endpoint are 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'/api/v1/transactions/122/receipt':48 '/docs':170 '/pricing':171 '/readme':173 '/request':17,34 '0.02':16,33,73,118,164 '000':101 '0x833589fcd6edb6e08f4c7c32d4f71b54bda02913':106 '122':221 '16':155 '20':100 '300':138 '402':93 '6':114 'Base network API' 'USDC micropayment API' 'accept':143 'across':157 'actual':199 'advertis':126 'ai':62 'analyt':61 'api':58,78 'application/json':148 'avail':197 'base':9,26,102,109 'base-network' 'behind':203 'broader':54 'call':4,21,120 'categori':59,159 'challeng':96 'commit':85 'connect':178 'consist':121 'content':184 'could':211 'crypto payment API' 'data':60,200 'decim':115 'document':168,193,224 'enabl':38 'endpoint':7,24,39,89,142,156,207 'equal':117 'exact':134 'exampl':196 'financ':65 'four':158 'function':202 'howev':167 'id':220 'infrastructur':68 'json-response' 'key':79 'land':152 'learn':64 'limit':82 'list':154 'lowpaymentfee' 'lowpaymentfee.com':41 'machin':63 'made':130 'multipl':57 'network':110 'no-api-key' 'offer':56 'openapi':188 'page':153,169 'part':51 'particular':205 'pay':2,19 'pay-per-cal':1,18 'pay-per-call' 'pay-per-request API' 'payment':94,98,128 'per':3,20,74,119 'platform':55,150 'point':166 'post':144 'price':71,127,165 'probe':90 'prompt':180 'provid':42 'rate':81 'receipt':6,23,45,206,215 'request':75,97,145 'request/response':191 'requir':86,95 'resourc':46,219 'respons':227 'return':91,147,175,212 'sampl':226 'schema':192 'scheme':135 'second':139 'settl':12,29 'sinc':111 'site':124 'spec':189 'specif':88,218 'specul':230 'substant':183 'timeout':140 'transact':5,22,44,214 'transaction receipt API' 'transaction-receipt' 'unclear':209 'unit':103 'usdc':14,31,105,112 'usdc-settlement' 'use':113 'util':69 'via':10,27,131 'wallet':179 'web3':66 'without':223 'x402':11,28,37,133 'x402 payment endpoint' 'x402-enabled':36 'x402-payment'","prices":[{"id":"dacbddd3-e1d1-45f5-8459-d2a15912721b","listingId":"545250b5-0fb4-4691-88e9-57713b3ef6fb","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/122/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":"2026-04-18T18:58:26.758Z"}],"sources":[{"listingId":"545250b5-0fb4-4691-88e9-57713b3ef6fb","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/transactions/122/receipt","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:58:26.758Z","lastSeenAt":"2026-04-25T01:32:59.900Z"}],"details":{"listingId":"545250b5-0fb4-4691-88e9-57713b3ef6fb","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/transactions/122/receipt \\\n  -H \"X-PAYMENT: <x402-payment-header>\" \\\n  -H \"Content-Type: application/json\"","exampleRequest":null,"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"The endpoint returns a 402 challenge requesting 20,000 base units of USDC on Base network with a 300-second timeout","source_url":"https://lowpaymentfee.com/api/v1/transactions/122/receipt"},{"claim":"The platform advertises $0.02 per request with no API keys, no rate limits, and instant access on the Base network","source_url":"https://lowpaymentfee.com"},{"claim":"The platform lists 16 endpoints across Data & Analytics, AI & Machine Learning, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"},{"claim":"Documentation pages (/docs, /pricing, /api, /README) contain only a 'Connect wallet' prompt","source_url":"https://lowpaymentfee.com/docs"}],"useCases":["Retrieving transaction receipts via a pay-per-call model without needing API keys","Agent-driven workflows that need on-demand access to transaction data with crypto micropayments","Integrating low-cost USDC-settled API calls into Web3 applications"],"bestFor":["Developers wanting keyless, pay-per-use API access settled in USDC on Base","AI agents that can autonomously pay for API calls via x402 protocol","Projects needing low-friction access without subscription commitments"],"notFor":["Users who need detailed API documentation or response schema before integrating","High-volume use cases where per-request pricing may not be cost-effective compared to subscriptions","Developers who cannot transact in USDC on the Base network"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:44.094Z"},"updatedAt":"2026-04-25T01:32:59.900Z"}}