{"id":"d5d165c3-e8b0-42ca-bf98-8192c32e298a","shortId":"qnAdZU","kind":"x402","title":"Pay-per-call transaction receipt endpoint on Base via x402, $0.02/request in USDC.","tagline":"Pay-per-call transaction receipt endpoint on Base via x402, $0.02/request in USDC.","description":"This endpoint at lowpaymentfee.com provides a \"Premium API Access\" transaction receipt resource via the x402 payment protocol. It is one of many endpoints offered by the lowpaymentfee.com platform, which hosts a variety of pay-per-request APIs spanning data analytics, AI/ML inference, finance/Web3 data, and utility services—all priced at $0.02 per request settled in USDC on the Base network.\n\nThe specific endpoint `/api/v1/transactions/37/receipt` accepts POST requests and returns JSON. Payment is handled inline via the x402 protocol: callers must include an X-PAYMENT header with a valid payment proof. The maximum amount required is 20,000 base units of USDC (6 decimals), which equals $0.02. The platform advertises no API keys, no rate limits, and instant access—payment is the only authentication mechanism.\n\nDocumentation beyond the landing page is minimal; the /docs, /pricing, /api, 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 response format after successful payment is undocumented.","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 endpoint","pay-per-call API","USDC micropayment API","Base network API","lowpaymentfee","402 payment protocol"],"warnings":["No OpenAPI or schema documentation available","All documentation pages return only a 'Connect wallet' prompt with no technical content","The actual response payload after successful payment is completely undocumented","It is unclear what data the 'transaction receipt' endpoint actually returns"],"endpointUrl":"https://lowpaymentfee.com/api/v1/transactions/37/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/37/receipt","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.350","qualityRationale":"The endpoint is confirmed live via a valid 402 challenge, but there is no OpenAPI spec, no documented request/response schema, no examples, and the docs pages are empty. The actual functionality behind 'Premium API Access' for this specific receipt endpoint is 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'/api/v1/transactions/37/receipt':95 '/docs':165 '/pricing':166 '/readme':169 '/request':13,28 '0.02':12,27,82,138 '000':129 '20':128 '402':205 '402 payment protocol' '6':134 'Base network API' 'USDC micropayment API' 'accept':96 'access':39,150 'actual':209 'addit':180 'advertis':141 'ai/ml':72 'amount':125 'analyt':71 'api':38,68,143 'authent':155 'avail':196 'base':9,24,90,130 'base-network' 'beyond':158 'call':4,19 'caller':110 'challeng':206 'confirm':200 'connect':175 'data':70,75 'decim':135 'detail':182 'document':157,191 'endpoint':7,22,32,53,94,198 'equal':137 'exampl':194 'finance/web3':74 'format':211 'handl':104 'header':117 'host':60 'includ':112 'infer':73 'inlin':105 'instant':149 'json':101 'json-response' 'key':144 'land':160 'limit':147 'live':201 'lowpaymentfee' 'lowpaymentfee.com':34,57 'mani':52 'maximum':124 'mechan':156 'minim':163 'must':111 'network':91 'no-api-key' 'offer':54 'one':50 'openapi':186 'page':161,170 'pay':2,17,65 'pay-per-cal':1,16 'pay-per-call API' 'pay-per-request':64 'payload':195 'payment':46,102,116,121,151,214 'per':3,18,66,83 'platform':58,140 'post':97 'premium':37 'price':80 'prompt':177 'proof':122 'proper':204 'protocol':47,109 'provid':35 'rate':146 'receipt':6,21,41 'render':172 'request':67,84,98 'request/response':189 'requir':126 'resourc':42 'respons':210 'return':100,202 'schema':190 'servic':78 'settl':85 'span':69 'spec':187 'specif':93 'success':213 'technic':181 'transact':5,20,40 'transaction receipt API' 'transaction-receipt' 'undocu':216 'unit':131 'usdc':15,30,87,133 'usdc-settlement' 'util':77 'valid':120 'varieti':62 'via':10,25,43,106 'wallet':176 'x':115 'x-payment':114 'x402':11,26,45,108 'x402 endpoint' 'x402-payment'","prices":[{"id":"6d5b09bd-220a-446c-9f45-f700c962c5fc","listingId":"d5d165c3-e8b0-42ca-bf98-8192c32e298a","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/37/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":"2026-04-18T19:26:38.060Z"}],"sources":[{"listingId":"d5d165c3-e8b0-42ca-bf98-8192c32e298a","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/transactions/37/receipt","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T19:26:38.060Z","lastSeenAt":"2026-04-24T05:03:16.435Z"}],"details":{"listingId":"d5d165c3-e8b0-42ca-bf98-8192c32e298a","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/transactions/37/receipt \\\n  -H \"X-PAYMENT: <valid_x402_payment_proof>\" \\\n  -H \"Content-Type: application/json\"","exampleRequest":null,"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"Platform charges $0.02 per request with no API keys, no rate limits, and instant access on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"Endpoint returns 402 with maxAmountRequired of 20000 base units of USDC (USD Coin) on Base","source_url":"https://lowpaymentfee.com/api/v1/transactions/37/receipt"},{"claim":"Payment is settled to address 0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3 using USDC contract 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/transactions/37/receipt"}],"useCases":["Retrieving a transaction receipt after completing a payment flow","Programmatic access to receipt data without traditional API key management","Agent-driven workflows that need proof-of-transaction documents"],"bestFor":["Developers experimenting with x402 payment-gated APIs","Agents that can settle USDC payments on Base L2","Use cases requiring no-signup, pay-as-you-go access to receipts"],"notFor":["Users needing detailed API documentation or OpenAPI specs before integrating","High-volume batch processing where per-request pricing is cost-prohibitive","Applications requiring fiat payment rails (credit card, Stripe)"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:37.361Z"},"updatedAt":"2026-04-24T05:03:16.435Z"}}