{"id":"affc2d7a-d972-4702-8560-9bea31a79530","shortId":"Wn3aFw","kind":"x402","title":"x402-gated transaction receipt endpoint on Base, paying $0.02 in USDC per request.","tagline":"x402-gated transaction receipt endpoint on Base, paying $0.02 in USDC per request.","description":"This endpoint at lowpaymentfee.com provides access to a transaction receipt (resource path `/api/v1/transactions/258/receipt`) behind an x402 paywall. The site advertises itself as a platform hosting multiple API categories — data & analytics, AI & machine learning, finance & Web3, and infrastructure utilities — all priced at $0.02 per request, settled in USDC on the Base network with no API keys, no rate limits, and no commitments required.\n\nThe specific endpoint probed returns a valid x402 challenge (version 1, scheme \"exact\") requesting up to 20,000 base units of USDC (0x8335…2913 on Base, 6 decimals = $0.02) paid to address 0x1A2B…85F3. The payment method is POST with a 300-second timeout. The endpoint is live and responding correctly with HTTP 402.\n\nHowever, documentation is extremely thin. The /docs, /api, /pricing, and /README pages all render only a \"Connect wallet\" prompt with no substantive content. There is no OpenAPI spec, no request/response schema documentation, and no examples of what the receipt payload actually contains. The broader platform lists many endpoints across different domains, but without documentation it is unclear what data each returns or how reliable the underlying services are.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","transaction-receipt","per-request-pricing","no-api-key"],"categories":["finance","infrastructure"],"synonyms":["transaction receipt API","x402 payment endpoint","USDC micropayment API","Base network API","pay-per-call API","lowpaymentfee"],"warnings":["No API documentation available; /docs, /api, /pricing, and /README pages all render only 'Connect wallet'","No OpenAPI or output schema provided — the actual response payload structure is unknown","The specific endpoint is for a single transaction receipt (ID 258); unclear if this generalizes to other transaction IDs","The broader platform lists many endpoints but none have documented schemas or examples"],"endpointUrl":"https://lowpaymentfee.com/api/v1/transactions/258/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/258/receipt","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.300","qualityRationale":"The endpoint is live and returns a well-formed x402 challenge, but documentation is essentially nonexistent — every doc page shows only 'Connect wallet'. There is no OpenAPI spec, no request/response schema, and no examples of what the receipt payload contains. The listing is effectively a 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'/api/v1/transactions/258/receipt':41 '/docs':151 '/pricing':153 '/readme':155 '0.02':10,24,70,119 '000':108 '0x1a2b':123 '0x8335':113 '1':101 '20':107 '2913':114 '300':132 '402':144 '6':117 '85f3':124 'Base network API' 'USDC micropayment API' 'access':34 'across':193 'actual':185 'address':122 'advertis':48 'ai':59 'analyt':58 'api':55,82 'base':8,22,78,109,116 'base-network' 'behind':42 'broader':188 'categori':56 'challeng':99 'commit':89 'connect':161 'contain':186 'content':167 'correct':141 'data':57,203 'decim':118 'differ':194 'document':146,176,198 'domain':195 'endpoint':6,20,30,93,136,192 'exact':103 'exampl':179 'extrem':148 'financ':62 'gate':3,17 'host':53 'howev':145 'http':143 'infrastructur':65 'key':83 'learn':61 'limit':86 'list':190 'live':138 'lowpaymentfee' 'lowpaymentfee.com':32 'machin':60 'mani':191 'method':127 'multipl':54 'network':79 'no-api-key' 'openapi':171 'page':156 'paid':120 'path':40 'pay':9,23 'pay-per-call API' 'payload':184 'payment':126 'paywal':45 'per':13,27,71 'per-request-pricing' 'platform':52,189 'post':129 'price':68 'probe':94 'prompt':163 'provid':33 'rate':85 'receipt':5,19,38,183 'reliabl':208 'render':158 'request':14,28,72,104 'request/response':174 'requir':90 'resourc':39 'respond':140 'return':95,205 'schema':175 'scheme':102 'second':133 'servic':211 'settl':73 'site':47 'spec':172 'specif':92 'substant':166 'thin':149 'timeout':134 'transact':4,18,37 'transaction receipt API' 'transaction-receipt' 'unclear':201 'under':210 'unit':110 'usdc':12,26,75,112 'usdc-settlement' 'util':66 'valid':97 'version':100 'wallet':162 'web3':63 'without':197 'x402':2,16,44,98 'x402 payment endpoint' 'x402-gated':1,15 'x402-payment'","prices":[{"id":"438fe032-a153-41d6-bff8-0b1ec1778eb7","listingId":"affc2d7a-d972-4702-8560-9bea31a79530","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/258/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":"2026-04-18T18:59:46.286Z"}],"sources":[{"listingId":"affc2d7a-d972-4702-8560-9bea31a79530","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/transactions/258/receipt","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:59:46.286Z","lastSeenAt":"2026-04-24T13:32:36.937Z"}],"details":{"listingId":"affc2d7a-d972-4702-8560-9bea31a79530","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/transactions/258/receipt\n# Returns 402 with x402 challenge; attach X-PAYMENT header with USDC payment proof on Base to access the receipt.","exampleRequest":null,"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"The endpoint returns a valid x402 challenge with maxAmountRequired of 20000 base units of USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/transactions/258/receipt"},{"claim":"All APIs are 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":"The platform lists endpoints across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"},{"claim":"Documentation pages (/docs, /api, /pricing, /README) render only 'Connect wallet' with no substantive content","source_url":"https://lowpaymentfee.com/docs"}],"useCases":["Retrieving a transaction receipt for transaction ID 258 via a single micropayment","Demonstrating x402 protocol payment flows on Base with USDC","Agent-driven pay-per-use API access without API key management"],"bestFor":["Developers experimenting with x402 payment protocol","Agents needing keyless, pay-per-call API access on Base","Testing micropayment-gated endpoint integrations"],"notFor":["Production workloads requiring documented request/response schemas","Users who need bulk or subscription-based pricing","Anyone needing detailed API documentation before integration"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:40.316Z"},"updatedAt":"2026-04-24T13:32:36.937Z"}}