{"id":"3cb15dcd-e0c5-476c-81e3-177fbe8d1c41","shortId":"5UmBJ2","kind":"x402","title":"x402-gated transaction receipt endpoint on Base, paid per-call in USDC.","tagline":"x402-gated transaction receipt endpoint on Base, paid per-call in USDC.","description":"This endpoint at lowpaymentfee.com provides access to a transaction receipt (resource ID 392) behind an x402 payment wall. The endpoint accepts POST requests and returns JSON. Payment is settled on the Base network using USDC (contract 0x8335…2913) via the x402 \"exact\" scheme. The maximum amount required per call is 20,000 base units of USDC, which equals $0.02 (USDC uses 6 decimals).\n\nThe broader lowpaymentfee.com platform advertises a suite of pay-per-request APIs spanning data analytics, AI/ML inference (sentiment analysis, summarization, classification, embeddings), finance and crypto market data, and infrastructure utilities (geocoding, validation, conversion, generation). All endpoints are listed at $0.02 per request with no API keys, no rate limits, and no minimum commitments. However, this specific listing is for the `/api/v1/transactions/392/receipt` path, which appears to be a transaction receipt retrieval endpoint rather than one of the advertised category APIs.\n\nDocumentation 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 request/response schema documentation, and no usage examples available from the crawl. The endpoint is confirmed live (returns a proper 402 x402 challenge), but the actual response payload structure is unknown.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","transaction-receipt","pay-per-request","no-api-key","json-response"],"categories":["finance","infrastructure"],"synonyms":["transaction receipt API","x402 paid endpoint","USDC micropayment API","Base network API","pay-per-call API","lowpaymentfee"],"warnings":["No API documentation available — /docs, /api, /pricing, and /README all show only 'Connect wallet'","No OpenAPI or schema definition found for request or response payloads","The endpoint path references a specific transaction ID (392); unclear if this is a demo or a fixed resource","The broader platform advertises many API categories but none have documented schemas or examples","Cannot verify what data the receipt endpoint actually returns without making a paid request"],"endpointUrl":"https://lowpaymentfee.com/api/v1/transactions/392/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/392/receipt","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.300","qualityRationale":"The endpoint is confirmed live via a valid 402 x402 challenge, and pricing is clear ($0.02 USDC on Base). However, there is no OpenAPI spec, no documentation beyond a wallet-connect prompt, no request/response schema, and no examples. The specific resource (transaction 392 receipt) is opaque with no explanation of what it returns. This is effectively a stub 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'/api/v1/transactions/392/receipt':153 '/docs':177 '/pricing':179 '/readme':181 '0.02':87,132 '000':80 '0x8335':65 '20':79 '2913':66 '392':41 '402':220 '6':90 'Base network API' 'USDC micropayment API' 'accept':49 'access':34 'actual':225 'advertis':96,169 'ai/ml':108 'amount':74 'analysi':111 'analyt':107 'api':104,137,171 'appear':156 'avail':208 'base':8,22,60,81 'base-network' 'behind':42 'broader':93 'call':12,26,77 'categori':170 'challeng':222 'classif':113 'commit':145 'confirm':215 'connect':187 'contract':64 'convers':125 'crawl':211 'crypto':117 'data':106,119 'decim':91 'detail':194 'document':172,203 'embed':114 'endpoint':6,20,30,48,128,163,213 'equal':86 'exact':70 'exampl':207 'extrem':174 'financ':115 'gate':3,17 'generat':126 'geocod':123 'howev':146 'id':40 'infer':109 'infrastructur':121 'json':54 'json-response' 'key':138 'limit':141 'list':130,149 'live':216 'lowpaymentfee' 'lowpaymentfee.com':32,94 'market':118 'maximum':73 'minimum':144 'network':61 'no-api-key' 'one':166 'openapi':198 'page':182 'paid':9,23 'path':154 'pay':101 'pay-per-call API' 'pay-per-request':100 'payload':227 'payment':45,55 'per':11,25,76,102,133 'per-cal':10,24 'platform':95 'post':50 'prompt':189 'proper':219 'provid':33 'rate':140 'rather':164 'receipt':5,19,38,161 'render':184 'request':51,103,134 'request/response':201 'requir':75 'resourc':39 'respons':226 'retriev':162 'return':53,217 'schema':202 'scheme':71 'sentiment':110 'settl':57 'span':105 'spars':175 'spec':199 'specif':148 'structur':228 'suit':98 'summar':112 'technic':193 'transact':4,18,37,160 'transaction receipt API' 'transaction-receipt' 'unit':82 'unknown':230 'usag':206 'usdc':14,28,63,84,88 'usdc-settlement' 'use':62,89 'util':122 'valid':124 'via':67 'wall':46 'wallet':188 'x402':2,16,44,69,221 'x402 paid endpoint' 'x402-gated':1,15 'x402-payment'","prices":[{"id":"94d51609-00b9-4d01-9a78-5f8ea1264f1d","listingId":"3cb15dcd-e0c5-476c-81e3-177fbe8d1c41","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/392/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":"2026-04-18T19:26:47.824Z"}],"sources":[{"listingId":"3cb15dcd-e0c5-476c-81e3-177fbe8d1c41","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/transactions/392/receipt","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T19:26:47.824Z","lastSeenAt":"2026-04-24T04:04:20.217Z"}],"details":{"listingId":"3cb15dcd-e0c5-476c-81e3-177fbe8d1c41","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/transactions/392/receipt\n# Returns 402 with x402 challenge; attach X-PAYMENT header with signed USDC payment on Base to complete.","exampleRequest":null,"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"The endpoint returns a 402 x402 challenge with maxAmountRequired of 20000 base units of USDC on Base network","source_url":"https://lowpaymentfee.com/api/v1/transactions/392/receipt"},{"claim":"USDC asset contract is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base","source_url":"https://lowpaymentfee.com/api/v1/transactions/392/receipt"},{"claim":"Platform advertises $0.02/request pricing with no API keys, no rate limits, and instant access","source_url":"https://lowpaymentfee.com"},{"claim":"Platform lists APIs across data/analytics, AI/ML, finance/Web3, and infrastructure categories","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":["Retrieving a transaction receipt for transaction ID 392 via programmatic payment","Demonstrating x402 protocol payment flows on the Base network","Agent-driven micropayment API consumption without API key management"],"bestFor":["Developers experimenting with x402 payment protocol integrations","Agents that need to fetch transaction receipts with per-call crypto payments","Use cases requiring keyless, pay-as-you-go API access on Base"],"notFor":["Users needing detailed API documentation or response schema guarantees","High-volume batch retrieval where per-call pricing is inefficient","Anyone without a Base-network USDC wallet"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:36.897Z"},"updatedAt":"2026-04-24T04:04:20.217Z"}}