{"id":"15931ca7-c5d0-4d98-b571-5e58b846b861","shortId":"W8mjUr","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 136) 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/136/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 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 gated entirely by the per-request micropayment.\n\nWhile the platform homepage lists many endpoints across analytics, AI, finance, and utility categories, the crawled documentation pages (`/docs`, `/api`, `/pricing`, `/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 behavior and data returned by this specific receipt endpoint — or any of the other listed endpoints — cannot be verified from the available material.","tags":[],"capabilities":["x402-payment","usdc-micropayment","base-network","transaction-receipt","json-response","per-call-billing"],"categories":["finance","infrastructure"],"synonyms":["transaction receipt API","x402 micropayment endpoint","USDC pay-per-call","Base network API","lowpaymentfee","crypto payment API"],"warnings":["No OpenAPI or schema documentation available for any endpoint on this platform","All documentation pages (/docs, /api, /pricing, /README) returned only 'Connect wallet' with no content","The specific data returned by this receipt endpoint is unknown — no response schema or example exists","The platform lists many endpoint categories (AI, analytics, finance, utilities) but none have verifiable documentation","Cannot confirm what data or functionality any of the advertised endpoints actually provide"],"endpointUrl":"https://lowpaymentfee.com/api/v1/transactions/136/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/136/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 (returns a valid x402 402 challenge), but there is no OpenAPI spec, no documented request/response schema, no examples, and the docs/pricing/README pages are all empty beyond a wallet-connect prompt. The specific purpose of this receipt endpoint is unclear beyond its URL path. Effectively a stub 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'/api/v1/transactions/136/receipt':85 '/docs':173 '/pricing':175 '/readme':176 '0.02':71,124 '000':120 '136':40 '20':119 '6':128 'Base network API' 'USDC pay-per-call' 'accept':86 'access':145 'across':162 'actual':202 'address':134 'advertis':53,144 'ai':60,164 'analyt':59,163 'api':55,138 'application/json':91 'attach':105 'avail':200,224 'base':8,22,80,121,136 'base-network' 'behavior':203 'behind':41 'broader':50 'call':12,26 'caller':103 'cannot':219 'categori':56,168 'connect':181 'contain':111 'content':187 'crawl':170 'crypto payment API' 'data':58,205 'decim':129 'document':171,196 'endpoint':6,20,30,84,161,211,218 'entir':148 'exact':99 'exact-pay':98 'exampl':199 'financ':63,165 'gate':3,17,147 'handl':94 'header':110 'homepag':158 'i.e':123 'id':39 'includ':57 'infrastructur':66 'json-response' 'key':139 'learn':62 'limit':142 'list':159,217 'lowpaymentfee' 'lowpaymentfee.com':32 'machin':61 'mani':160 'materi':225 'micropay':154 'multipl':54 'must':104 'network':81 'openapi':191 'page':172 'paid':9,23 'part':47 'payment':92,100,109,115 'payto':133 'paywal':44 'per':11,25,72,152 'per-cal':10,24 'per-call-billing' 'per-request':151 'platform':51,157 'post':87 'price':69 'prompt':183 'provid':33 'rate':141 'receipt':5,19,36,210 'request':73,88,153 'request/response':194 'resourc':37 'return':90,178,206 'schema':195 'scheme':101 'settl':75 'sign':113 'sinc':125 'spec':192 'specif':83,209 'specifi':132 'substant':186 'transact':4,18,35,38 'transaction receipt API' 'transaction-receipt' 'unit':122 'usdc':14,28,77,114,126 'usdc-micropayment' 'use':127 'util':67,167 'verifi':221 'via':95 'wallet':182 'web3':64 'x':108 'x-payment':107 'x402':2,16,43,97 'x402 micropayment endpoint' 'x402-gated':1,15 'x402-payment'","prices":[{"id":"071f9260-5d7c-433c-97f5-546be436f10e","listingId":"15931ca7-c5d0-4d98-b571-5e58b846b861","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/136/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":"2026-04-18T18:58:29.184Z"}],"sources":[{"listingId":"15931ca7-c5d0-4d98-b571-5e58b846b861","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/transactions/136/receipt","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:58:29.184Z","lastSeenAt":"2026-04-25T00:05:09.467Z"}],"details":{"listingId":"15931ca7-c5d0-4d98-b571-5e58b846b861","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/transactions/136/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 x402 challenge with maxAmountRequired of 20000 base units in USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/transactions/136/receipt"},{"claim":"The platform advertises $0.02 per request across all endpoints 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 network","source_url":"https://lowpaymentfee.com/api/v1/transactions/136/receipt"},{"claim":"Documentation pages /docs, /api, /pricing, /README all show only 'Connect wallet'","source_url":"https://lowpaymentfee.com/docs"}],"useCases":["Retrieving a transaction receipt for transaction 136 via a single micropayment","Demonstrating x402 pay-per-request integration on Base","Agent-driven programmatic access to paid receipt data without API keys"],"bestFor":["Developers experimenting with x402 payment protocol on Base","Agents that can sign USDC payments for per-call API access","Use cases requiring keyless, pay-as-you-go API consumption"],"notFor":["Users needing detailed API documentation or request/response schemas before integrating","High-volume batch retrieval where per-call micropayments add up","Anyone without a Base-compatible wallet holding USDC"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:43.945Z"},"updatedAt":"2026-04-25T00:05:09.467Z"}}