{"id":"4dc4247e-3c7e-4429-b757-6886f21162dd","shortId":"JLr99u","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 140) 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/140/receipt` accepts POST requests and returns `application/json`. Payment is handled via the x402 exact-payment scheme: the caller includes an X-PAYMENT header with a USDC payment of up to 20,000 base units (i.e., $0.02, since USDC uses 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 beyond the landing page is extremely thin — the /docs, /api, /pricing, and /README pages all render only a \"Connect wallet\" prompt with no additional technical detail. There is no OpenAPI spec, no request/response schema documentation, and no example payloads available. The endpoint is confirmed live (returns a proper 402 challenge), but the actual data returned after payment is unknown. The platform appears to be a demonstration or early-stage x402 service showcasing low-fee micropayments.","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 API","USDC pay-per-call","Base network API","lowpaymentfee","crypto payment endpoint","402 payment required API"],"warnings":["No OpenAPI or schema documentation available — request and response formats are unknown.","All documentation pages (/docs, /api, /pricing, /README) render only 'Connect wallet' with no content.","The specific endpoint is for a single transaction receipt (ID 140); unclear if this is a demo or production resource.","Platform appears early-stage or demonstrative; reliability and uptime are unverified."],"endpointUrl":"https://lowpaymentfee.com/api/v1/transactions/140/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/140/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 valid x402 402 challenge, confirming it works. However, there is no OpenAPI spec, no documented request body or response schema, and all secondary pages are empty wallet-connect stubs. The specific purpose of this particular receipt endpoint is unclear beyond its URL path. Effectively a stub 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'/api/v1/transactions/140/receipt':85 '/docs':159 '/pricing':161 '/readme':163 '0.02':71,122 '000':118 '140':40 '20':117 '402':199 '402 payment required API' '6':126 'Base network API' 'USDC pay-per-call' 'accept':86 'access':143 'actual':203 'addit':174 'address':132 'advertis':53,142 'ai':60 'analyt':59 'api':55,136 'appear':212 'application/json':91 'avail':190 'base':8,22,80,119,134 'base-network' 'behind':41 'beyond':151 'broader':50 'call':12,26,149 'caller':103 'categori':56 'challeng':200 'confirm':194 'connect':169 'crypto payment endpoint' 'data':58,204 'decim':127 'demonstr':216 'detail':176 'document':150,185 'earli':219 'early-stag':218 'endpoint':6,20,30,84,192 'exact':99 'exact-pay':98 'exampl':188 'extrem':156 'fee':226 'financ':63 'gate':3,17 'handl':94 'header':109 'i.e':121 'id':39 'includ':57,104 'infrastructur':66 'json-response' 'key':137 'land':153 'learn':62 'limit':140 'live':195 'low':225 'low-fe':224 'lowpaymentfee' 'lowpaymentfee.com':32 'machin':61 'micropay':227 'multipl':54 'network':81 'no-api-key' 'openapi':180 'page':154,164 'paid':9,23 'part':47 'pay':147 'pay-per-cal':146 'pay-per-call' 'payload':189 'payment':92,100,108,113,207 'payto':131 'paywal':44 'per':11,25,72,148 'per-cal':10,24 'platform':51,211 'post':87 'price':69 'prompt':171 'proper':198 'provid':33 'pure':145 'rate':139 'receipt':5,19,36 'render':166 'request':73,88 'request/response':183 'resourc':37 'return':90,196,205 'schema':184 'scheme':101 'servic':222 'settl':75 'showcas':223 'sinc':123 'spec':181 'specif':83 'specifi':130 'stage':220 'technic':175 'thin':157 'transact':4,18,35,38 'transaction receipt API' 'transaction-receipt' 'unit':120 'unknown':209 'usdc':14,28,77,112,124 'usdc-settlement' 'use':125 'util':67 'via':95 'wallet':170 'web3':64 'x':107 'x-payment':106 'x402':2,16,43,97,221 'x402 micropayment API' 'x402-gated':1,15 'x402-payment'","prices":[{"id":"ab9d3a8f-6cd7-4826-be18-e62160c93a25","listingId":"4dc4247e-3c7e-4429-b757-6886f21162dd","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/140/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":"2026-04-18T18:58:41.839Z"}],"sources":[{"listingId":"4dc4247e-3c7e-4429-b757-6886f21162dd","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/transactions/140/receipt","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:58:41.839Z","lastSeenAt":"2026-04-24T22:32:56.302Z"}],"details":{"listingId":"4dc4247e-3c7e-4429-b757-6886f21162dd","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/transactions/140/receipt \\\n  -H \"X-PAYMENT: <x402-payment-token>\" \\\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 x402Version 1, exact scheme, USDC on Base, maxAmountRequired 20000","source_url":"https://lowpaymentfee.com/api/v1/transactions/140/receipt"},{"claim":"The platform advertises $0.02 per request across all APIs with no API keys, no rate limits, and instant access on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset address 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base","source_url":"https://lowpaymentfee.com/api/v1/transactions/140/receipt"}],"useCases":["Retrieving a transaction receipt for transaction 140 via micropayment","Demonstrating x402 protocol payment flows on Base","Integrating pay-per-call APIs without API key management"],"bestFor":["Developers experimenting with x402 payment protocol","Agents that can settle USDC micropayments on Base","Use cases requiring keyless, pay-as-you-go API access"],"notFor":["Production workloads requiring documented request/response schemas","Users who need fiat-only payment options","Bulk data retrieval at scale (no documented batch endpoints)"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:43.351Z"},"updatedAt":"2026-04-24T22:32:56.302Z"}}