{"id":"8c51b40d-9c9c-4b2f-91ec-5e12dc4274c5","shortId":"BcNxC6","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 a transaction receipt resource (transaction ID 38) behind an x402 paywall. It is part of a broader platform that advertises multiple API categories including Data & Analytics, AI & Machine Learning, Finance & Web3, and Infrastructure utilities — all priced at $0.02 per request and settled in USDC on the Base network.\n\nThe specific endpoint `/api/v1/transactions/38/receipt` accepts POST requests and returns `application/json`. Payment is handled via the x402 exact-payment scheme: the caller must attach an X-PAYMENT header containing a signed USDC payment of up to 0.02 USDC (maxAmountRequired=20000 base units, USDC has 6 decimals) to the specified payTo address on Base. No API keys or rate limits are advertised; access is purely pay-per-call.\n\nDocumentation is extremely sparse — the /docs, /pricing, /api, and /README pages all render only a \"Connect wallet\" prompt with no further content. There is no OpenAPI spec, no request/response schema beyond the x402 challenge's outputSchema stub, and no explanation of what the receipt payload actually contains. The platform appears to be a demonstration or early-stage x402 showcase rather than a mature production API.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","transaction-receipt","pay-per-call","no-api-key"],"categories":["finance","infrastructure"],"synonyms":["transaction receipt API","x402 paid endpoint","USDC micropayment API","Base network API","lowpaymentfee","pay-per-request API"],"warnings":["No OpenAPI or schema documentation available — request and response formats are unknown.","All documentation pages (/docs, /pricing, /api, /README) render only 'Connect wallet' with no content.","The endpoint targets a specific transaction ID (38); it is unclear whether this is a generic pattern or a fixed resource.","Platform appears to be a demo or early-stage project; production readiness is uncertain."],"endpointUrl":"https://lowpaymentfee.com/api/v1/transactions/38/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/38/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 (402 challenge captured) and pricing is clear ($0.02 USDC on Base), but there is no OpenAPI spec, no documented request body or response schema, and all documentation pages are empty beyond a wallet-connect prompt. The specific resource (transaction 38 receipt) is unexplained. This is effectively a stub 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'/api/v1/transactions/38/receipt':85 '/docs':156 '/pricing':157 '/readme':160 '0.02':71,119 '20000':122 '38':40 '6':127 'Base network API' 'USDC micropayment API' 'accept':86 'access':144 'actual':196 'address':133 'advertis':53,143 'ai':60 'analyt':59 'api':55,137,216 'appear':200 'application/json':91 'attach':105 'base':8,22,80,123,135 'base-network' 'behind':41 'beyond':181 'broader':50 'call':12,26,150 'caller':103 'categori':56 'challeng':184 'connect':166 'contain':111,197 'content':172 'data':58 'decim':128 'demonstr':204 'document':151 'earli':207 'early-stag':206 'endpoint':6,20,30,84 'exact':99 'exact-pay':98 'explan':190 'extrem':153 'financ':63 'gate':3,17 'handl':94 'header':110 'id':39 'includ':57 'infrastructur':66 'key':138 'learn':62 'limit':141 'lowpaymentfee' 'lowpaymentfee.com':32 'machin':61 'matur':214 'maxamountrequir':121 'multipl':54 'must':104 'network':81 'no-api-key' 'openapi':176 'outputschema':186 'page':161 'paid':9,23 'part':47 'pay':148 'pay-per-cal':147 'pay-per-call' 'pay-per-request API' 'payload':195 'payment':92,100,109,115 'payto':132 'paywal':44 'per':11,25,72,149 'per-cal':10,24 'platform':51,199 'post':87 'price':69 'product':215 'prompt':168 'provid':33 'pure':146 'rate':140 'rather':211 'receipt':5,19,36,194 'render':163 'request':73,88 'request/response':179 'resourc':37 'return':90 'schema':180 'scheme':101 'settl':75 'showcas':210 'sign':113 'spars':154 'spec':177 'specif':83 'specifi':131 'stage':208 'stub':187 'transact':4,18,35,38 'transaction receipt API' 'transaction-receipt' 'unit':124 'usdc':14,28,77,114,120,125 'usdc-settlement' 'util':67 'via':95 'wallet':167 'web3':64 'x':108 'x-payment':107 'x402':2,16,43,97,183,209 'x402 paid endpoint' 'x402-gated':1,15 'x402-payment'","prices":[{"id":"42be3ad8-2295-482d-b4c3-b28d2423bfa0","listingId":"8c51b40d-9c9c-4b2f-91ec-5e12dc4274c5","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/38/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":"2026-04-18T19:26:30.081Z"}],"sources":[{"listingId":"8c51b40d-9c9c-4b2f-91ec-5e12dc4274c5","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/transactions/38/receipt","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T19:26:30.081Z","lastSeenAt":"2026-04-24T06:32:43.026Z"}],"details":{"listingId":"8c51b40d-9c9c-4b2f-91ec-5e12dc4274c5","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/transactions/38/receipt \\\n  -H \"X-PAYMENT: <signed-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 with maxAmountRequired=20000 in USDC (asset 0x8335…) on Base network","source_url":"https://lowpaymentfee.com/api/v1/transactions/38/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 offers Data & Analytics, AI & ML, Finance & Web3, and Infrastructure API categories","source_url":"https://lowpaymentfee.com"}],"useCases":["Retrieving a transaction receipt for transaction 38 via a micropayment","Demonstrating x402 protocol payment flows on Base","Testing agent-driven pay-per-call API consumption"],"bestFor":["Developers experimenting with x402 payment protocol","Agents that can sign USDC payments on Base","Testing micropayment-gated API access patterns"],"notFor":["Production workloads requiring documented request/response schemas","Users who need free or API-key-based authentication","Bulk data retrieval or high-throughput analytics"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:37.703Z"},"updatedAt":"2026-04-24T06:32:43.026Z"}}