{"id":"7fc16a0c-67a0-404a-aa2f-6a24d69f4c3f","shortId":"pq5zuX","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 163) 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/163/receipt` accepts POST requests and returns `application/json`. Payment is handled via the x402 protocol: callers receive a 402 challenge containing the accepted payment scheme (exact), the USDC asset contract on Base (`0x8335…`), and a maximum amount of 20,000 base units. Since USDC uses 6 decimals, this translates to $0.02 per call — consistent with the site's advertised flat pricing. No API keys or rate limits are required; access is granted immediately upon payment.\n\nDocumentation on the site is extremely thin — 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 documentation, and no usage examples. The endpoint is live (confirmed by the 402 challenge), but the actual data returned after payment is unknown. The platform appears to be a demonstration or early-stage x402 service rather than a mature API provider.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","transaction-receipt","per-call-pricing","no-api-key","json-response"],"categories":["finance","infrastructure"],"synonyms":["transaction receipt API","x402 API","USDC micropayment API","Base network API","pay-per-call API","lowpaymentfee","crypto payment endpoint"],"warnings":["No API documentation available — all doc pages render only 'Connect wallet'","No OpenAPI or schema definition found","No request body or response body examples available","Purpose of 'transaction 163 receipt' is unclear — may be a demo or placeholder","Platform maturity is uncertain; could be experimental"],"endpointUrl":"https://lowpaymentfee.com/api/v1/transactions/163/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/163/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 no documentation, no OpenAPI spec, no request/response examples, and the docs pages are empty. The purpose of this specific receipt endpoint is unclear beyond its URL path. Effectively a stub 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'0.02':71,134 '000':123 '0x8335':116 '163':40 '20':122 '402':102,204 '6':129 'Base network API' 'USDC micropayment API' 'accept':86,106 'access':153 'actual':208 'advertis':53,142 'ai':60 'amount':120 'analyt':59 'api':55,146,169,232 'appear':217 'application/json':91 'asset':112 'base':8,22,80,115,124 'base-network' 'behind':41 'broader':50 'call':12,26,136 'caller':99 'categori':56 'challeng':103,205 'confirm':201 'connect':177 'consist':137 'contain':104 'content':183 'contract':113 'crypto payment endpoint' 'data':58,209 'decim':130 'demonstr':221 'doc':167 'document':159,192 'earli':224 'early-stag':223 'endpoint':6,20,30,84,198 'exact':109 'exampl':196 'extrem':164 'financ':63 'flat':143 'gate':3,17 'grant':155 'handl':94 'id':39 'immedi':156 'includ':57 'infrastructur':66 'json-response' 'key':147 'learn':62 'limit':150 'live':200 'lowpaymentfee' 'lowpaymentfee.com':32 'machin':61 'matur':231 'maximum':119 'multipl':54 'network':81 'no-api-key' 'openapi':187 'page':172 'paid':9,23 'part':47 'pay-per-call API' 'payment':92,107,158,212 'paywal':44 'per':11,25,72,135 'per-cal':10,24 'per-call-pricing' 'platform':51,216 'post':87 'price':69,144,168 'prompt':179 'protocol':98 'provid':33,233 'rate':149 'rather':228 'readm':171 'receipt':5,19,36 'receiv':100 'render':174 'request':73,88 'request/response':190 'requir':152 'resourc':37 'return':90,210 'schema':191 'scheme':108 'servic':227 'settl':75 'sinc':126 'site':140,162 'spec':188 'specif':83 'stage':225 'thin':165 'transact':4,18,35,38 'transaction receipt API' 'transaction-receipt' 'translat':132 'unit':125 'unknown':214 'upon':157 'usag':195 'usdc':14,28,77,111,127 'usdc-settlement' 'use':128 'util':67 'via':95 'wallet':178 'web3':64 'x402':2,16,43,97,226 'x402 API' 'x402-gated':1,15 'x402-payment'","prices":[{"id":"4fbe9752-c4e7-4610-b1a4-f38abdc4eeee","listingId":"7fc16a0c-67a0-404a-aa2f-6a24d69f4c3f","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/163/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":"2026-04-18T18:58:50.352Z"}],"sources":[{"listingId":"7fc16a0c-67a0-404a-aa2f-6a24d69f4c3f","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/transactions/163/receipt","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:58:50.352Z","lastSeenAt":"2026-04-24T21:32:28.703Z"}],"details":{"listingId":"7fc16a0c-67a0-404a-aa2f-6a24d69f4c3f","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/transactions/163/receipt\n# Returns 402 with x402 challenge; attach X-PAYMENT header with USDC payment proof on Base to access.","exampleRequest":null,"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"The site advertises $0.02 per request with no API keys, no rate limits, and instant access on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"The endpoint returns a 402 challenge with maxAmountRequired of 20000 base units in USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/transactions/163/receipt"},{"claim":"USDC asset contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/transactions/163/receipt"},{"claim":"Available API categories include Data & Analytics, AI & ML, Finance & Web3, and Infrastructure","source_url":"https://lowpaymentfee.com"}],"useCases":["Retrieving a transaction receipt for transaction 163 via a single micropayment","Demonstrating x402 protocol payment flows for agent-to-API commerce","Testing USDC-based per-call API billing on Base"],"bestFor":["Developers experimenting with x402 payment protocol","Agents that need to pay-per-call without API key registration","Testing micropayment flows on Base network"],"notFor":["Production workloads requiring documented request/response schemas","Bulk data retrieval or batch processing","Users who need detailed API documentation before integrating"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:42.952Z"},"updatedAt":"2026-04-24T21:32:28.703Z"}}