{"id":"7acbba15-5a31-4026-a47e-d8d8436e0702","shortId":"9NwE7Y","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 (transaction ID 323) behind an x402 paywall. 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 wide catalog of pay-per-call APIs spanning data & analytics, AI/ML (sentiment analysis, summarization, classification, embeddings), finance & Web3 (price feeds, exchange rates, token quotes, gas estimates), 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/323/receipt` path only.\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 examples, and no detailed documentation available for this or any other endpoint on the platform. The endpoint is confirmed live (returns a proper 402 challenge), but what the receipt payload actually contains is unknown.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","transaction-receipt","pay-per-call","no-api-key"],"categories":["finance","infrastructure"],"synonyms":["transaction receipt","payment receipt","x402 API","USDC micropayment","Base network API","lowpaymentfee","pay-per-request API"],"warnings":["No OpenAPI spec or schema available for request or response bodies","All documentation pages (/docs, /pricing, /api, /README) render only 'Connect wallet' with no content","The specific resource path (/api/v1/transactions/323/receipt) is hardcoded to a single transaction ID — unclear if this is a demo or a real resource","No information on what fields the receipt response contains","Platform advertises many endpoints but none have documented schemas"],"endpointUrl":"https://lowpaymentfee.com/api/v1/transactions/323/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/323/receipt","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.250","qualityRationale":"The endpoint is live and returns a valid x402 challenge, but there is zero documentation, no OpenAPI spec, no request/response examples, and no explanation of what the receipt contains. The docs pages are empty. This is effectively a stub 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'/api/v1/transactions/323/receipt':158 '/docs':166 '/pricing':167 '/readme':170 '0.02':87,137 '000':80 '0x8335':65 '20':79 '2913':66 '323':42 '402':213 '6':90 'Base network API' 'USDC micropayment' 'accept':49 'access':34 'actual':220 'advertis':96 'ai/ml':109 'amount':74 'analysi':111 'analyt':108 'api':105,142 'avail':195 'base':8,22,60,81 'base-network' 'behind':43 'broader':93 'call':12,26,77,104 'catalog':99 'challeng':214 'classif':113 'commit':150 'confirm':208 'connect':176 'contain':221 'content':182 'contract':64 'convers':130 'data':107 'decim':91 'detail':193 'document':161,194 'embed':114 'endpoint':6,20,30,48,133,201,206 'equal':86 'estim':124 'exact':70 'exampl':190 'exchang':119 'extrem':163 'feed':118 'financ':115 'gas':123 'gate':3,17 'generat':131 'geocod':128 'howev':151 'id':41 'infrastructur':126 'json':54 'key':143 'limit':146 'list':135,154 'live':209 'lowpaymentfee' 'lowpaymentfee.com':32,94 'maximum':73 'minimum':149 'network':61 'no-api-key' 'openapi':186 'page':171 'paid':9,23 'path':159 'pay':102 'pay-per-cal':101 'pay-per-call' 'pay-per-request API' 'payload':219 'payment':55 'payment receipt' 'paywal':46 'per':11,25,76,103,138 'per-cal':10,24 'platform':95,204 'post':50 'price':117 'prompt':178 'proper':212 'provid':33 'quot':122 'rate':120,145 'receipt':5,19,38,218 'render':173 'request':51,139 'request/response':189 'requir':75 'resourc':39 'return':53,210 'scheme':71 'sentiment':110 'settl':57 'span':106 'spars':164 'spec':187 'specif':153 'summar':112 'token':121 'transact':4,18,37,40 'transaction receipt' 'transaction-receipt' 'unit':82 'unknown':223 'usdc':14,28,63,84,88 'usdc-settlement' 'use':62,89 'util':127 'valid':129 'via':67 'wallet':177 'web3':116 'wide':98 'x402':2,16,45,69 'x402 API' 'x402-gated':1,15 'x402-payment'","prices":[{"id":"c80b38e6-398b-4b40-b08f-425e0b2fc18b","listingId":"7acbba15-5a31-4026-a47e-d8d8436e0702","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/323/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":"2026-04-18T19:26:06.513Z"}],"sources":[{"listingId":"7acbba15-5a31-4026-a47e-d8d8436e0702","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/transactions/323/receipt","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T19:26:06.513Z","lastSeenAt":"2026-04-24T09:04:27.359Z"}],"details":{"listingId":"7acbba15-5a31-4026-a47e-d8d8436e0702","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/transactions/323/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":"Endpoint returns a 402 challenge with x402Version 1, exact scheme, on Base network using USDC at maxAmountRequired 20000 base units","source_url":"https://lowpaymentfee.com/api/v1/transactions/323/receipt"},{"claim":"USDC asset contract is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base","source_url":"https://lowpaymentfee.com/api/v1/transactions/323/receipt"},{"claim":"Platform lists all endpoints at $0.02 per request with no API keys, no rate limits, and instant access","source_url":"https://lowpaymentfee.com"},{"claim":"Documentation pages (/docs, /pricing, /api, /README) contain only a 'Connect wallet' prompt","source_url":"https://lowpaymentfee.com/docs"}],"useCases":["Retrieving a transaction receipt for transaction 323 via a single micropayment","Programmatic access to receipt data without API key registration","Agent-driven workflows that need on-chain-settled per-call billing"],"bestFor":["Developers or agents needing a simple pay-per-call receipt endpoint","Use cases where no API key signup is desired","x402-compatible agent wallets on the Base network"],"notFor":["Users who need detailed API documentation or response schemas before integrating","Bulk or high-volume receipt retrieval (no documented batch support)","Anyone without a Base-network USDC wallet"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:38.787Z"},"updatedAt":"2026-04-24T09:04:27.359Z"}}