{"id":"d6fbbea9-78c6-4233-a8d6-0210f153c627","shortId":"EjWP9b","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 97) 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/97/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 (i.e., $0.02 given USDC's 6 decimals). No API keys or rate limits are advertised; access is granted purely through per-request micropayments.\n\nDocumentation is extremely sparse — the docs, pricing, API, and README pages all render only a \"Connect wallet\" prompt with no substantive content. There is no OpenAPI spec, no request/response schema beyond the x402 outputSchema stub, and no explanation of what the receipt payload actually contains. The platform appears to be a demonstration or early-stage x402 showcase rather than a mature production API.","tags":[],"capabilities":["x402-payment","usdc-base","per-request-micropayment","transaction-receipt","json-response"],"categories":["finance","infrastructure"],"synonyms":["transaction receipt API","x402 micropayment endpoint","USDC pay-per-call","Base network API","lowpaymentfee"],"warnings":["No documentation available — all doc/pricing/API pages render only 'Connect wallet' with no content.","No OpenAPI or schema describing request parameters or response structure.","Unknown what the receipt payload actually contains; the endpoint path suggests a single fixed resource (transaction 97) rather than a general-purpose API.","Platform may be a demo or early-stage project; maturity is unclear."],"endpointUrl":"https://lowpaymentfee.com/api/v1/transactions/97/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/97/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 (402 challenge captured) and pricing is clear ($0.02 USDC on Base), but there is no documentation, no OpenAPI spec, no request/response examples, and no explanation of what the receipt resource actually returns. Docs pages are empty. This is effectively a stub 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'0.02':71,127 '000':123 '0x8335':116 '20':122 '402':102 '6':131 '97':40 'Base network API' 'USDC pay-per-call' 'accept':86,106 'access':141 'actual':193 'advertis':53,140 'ai':60 'amount':120 'analyt':59 'api':55,134,157,213 'appear':197 'application/json':91 'asset':112 'base':8,22,80,115,124 'behind':41 'beyond':180 'broader':50 'call':12,26 'caller':99 'categori':56 'challeng':103 'connect':165 'contain':104,194 'content':171 'contract':113 'data':58 'decim':132 'demonstr':201 'doc':155 'document':150 'earli':204 'early-stag':203 'endpoint':6,20,30,84 'exact':109 'explan':187 'extrem':152 'financ':63 'gate':3,17 'given':128 'grant':143 'handl':94 'i.e':126 'id':39 'includ':57 'infrastructur':66 'json-response' 'key':135 'learn':62 'limit':138 'lowpaymentfee' 'lowpaymentfee.com':32 'machin':61 'matur':211 'maximum':119 'micropay':149 'multipl':54 'network':81 'openapi':175 'outputschema':183 'page':160 'paid':9,23 'part':47 'payload':192 'payment':92,107 'paywal':44 'per':11,25,72,147 'per-cal':10,24 'per-request':146 'per-request-micropayment' 'platform':51,196 'post':87 'price':69,156 'product':212 'prompt':167 'protocol':98 'provid':33 'pure':144 'rate':137 'rather':208 'readm':159 'receipt':5,19,36,191 'receiv':100 'render':162 'request':73,88,148 'request/response':178 'resourc':37 'return':90 'schema':179 'scheme':108 'settl':75 'showcas':207 'spars':153 'spec':176 'specif':83 'stage':205 'stub':184 'substant':170 'transact':4,18,35,38 'transaction receipt API' 'transaction-receipt' 'unit':125 'usdc':14,28,77,111,129 'usdc-base' 'util':67 'via':95 'wallet':166 'web3':64 'x402':2,16,43,97,182,206 'x402 micropayment endpoint' 'x402-gated':1,15 'x402-payment'","prices":[{"id":"93e60f8f-3a60-4eb6-90e6-065616249371","listingId":"d6fbbea9-78c6-4233-a8d6-0210f153c627","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/97/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":"2026-04-18T19:27:24.012Z"}],"sources":[{"listingId":"d6fbbea9-78c6-4233-a8d6-0210f153c627","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/transactions/97/receipt","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T19:27:24.012Z","lastSeenAt":"2026-04-23T23:03:17.704Z"}],"details":{"listingId":"d6fbbea9-78c6-4233-a8d6-0210f153c627","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/transactions/97/receipt\n# Returns 402 with x402 challenge; supply X-PAYMENT header with signed USDC payment on Base to access.","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 maxAmountRequired of 20000 base units in USDC on Base network","source_url":"https://lowpaymentfee.com/api/v1/transactions/97/receipt"},{"claim":"Platform advertises $0.02 per request, no API keys, no rate limits, across multiple API categories","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/transactions/97/receipt"}],"useCases":["Retrieving a transaction receipt for transaction 97 via a single micropayment","Demonstrating x402 protocol payment flows on Base","Integrating pay-per-call APIs without API key management"],"bestFor":["Developers experimenting with x402 micropayment protocols","Agents that can settle USDC payments on Base automatically","Projects needing keyless, pay-as-you-go API access"],"notFor":["Production workloads requiring documented request/response schemas","Users who need free or subscription-based API access","Anyone needing bulk or batch transaction receipt retrieval"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:35.159Z"},"updatedAt":"2026-04-23T23:03:17.704Z"}}