{"id":"2f122f8e-f44f-4419-b6b7-ab42a777357d","shortId":"Mg4ayM","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 13) 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/13/receipt` accepts POST requests and returns `application/json`. Payment is handled via the x402 protocol: callers receive a 402 challenge specifying the USDC asset on Base (contract `0x8335…2913`), and must attach an `X-PAYMENT` header with a valid payment proof. The max amount required is 20,000 base units of USDC (6 decimals), which equals $0.02 per call. No API keys or rate limits are advertised; access is purely pay-per-use.\n\nDocumentation is extremely thin — the docs, API, pricing, and README pages all render only a \"Connect wallet\" prompt with no further content. There is no OpenAPI spec, no request/response schema beyond the x402 challenge's `outputSchema`, 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-call-pricing","transaction-receipt","json-response","no-api-key"],"categories":["finance","infrastructure"],"synonyms":["transaction receipt API","x402 payment endpoint","USDC micropayment API","Base network API","pay-per-call API","lowpaymentfee"],"warnings":["No documentation available — all doc/API/pricing/README pages render only 'Connect wallet' with no content.","No OpenAPI or request/response schema provided; the actual receipt payload structure is unknown.","The endpoint is for a specific transaction ID (13); it is unclear whether this is parameterized or a fixed demo resource.","The broader platform lists many API categories but none have documented schemas or examples."],"endpointUrl":"https://lowpaymentfee.com/api/v1/transactions/13/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/13/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 confirmed) and pricing is clear ($0.02 USDC on Base), but there is no documentation, no OpenAPI spec, no request body schema, no example responses, and the docs pages are empty. The specific resource (transaction 13 receipt) is unexplained. This is effectively a stub 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'0.02':71,141 '000':132 '0x8335':111 '13':40 '20':131 '2913':112 '402':102 '6':137 'Base network API' 'USDC micropayment API' 'accept':86 'access':152 'actual':203 'advertis':53,151 'ai':60 'amount':128 'analyt':59 'api':55,145,165,223 'appear':207 'application/json':91 'asset':107 'attach':115 'base':8,22,80,109,133 'behind':41 'beyond':189 'broader':50 'call':12,26,143 'caller':99 'categori':56 'challeng':103,192 'connect':174 'contain':204 'content':180 'contract':110 'data':58 'decim':138 'demonstr':211 'doc':164 'document':159 'earli':214 'early-stag':213 'endpoint':6,20,30,84 'equal':140 'explan':197 'extrem':161 'financ':63 'gate':3,17 'handl':94 'header':120 'id':39 'includ':57 'infrastructur':66 'json-response' 'key':146 'learn':62 'limit':149 'lowpaymentfee' 'lowpaymentfee.com':32 'machin':61 'matur':221 'max':127 'multipl':54 'must':114 'network':81 'no-api-key' 'openapi':184 'outputschema':194 'page':169 'paid':9,23 'part':47 'pay':156 'pay-per-call API' 'pay-per-us':155 'payload':202 'payment':92,119,124 'paywal':44 'per':11,25,72,142,157 'per-cal':10,24 'per-call-pricing' 'platform':51,206 'post':87 'price':69,166 'product':222 'prompt':176 'proof':125 'protocol':98 'provid':33 'pure':154 'rate':148 'rather':218 'readm':168 'receipt':5,19,36,201 'receiv':100 'render':171 'request':73,88 'request/response':187 'requir':129 'resourc':37 'return':90 'schema':188 'settl':75 'showcas':217 'spec':185 'specif':83 'specifi':104 'stage':215 'thin':162 'transact':4,18,35,38 'transaction receipt API' 'transaction-receipt' 'unit':134 'usdc':14,28,77,106,136 'usdc-base' 'use':158 'util':67 'valid':123 'via':95 'wallet':175 'web3':64 'x':118 'x-payment':117 'x402':2,16,43,97,191,216 'x402 payment endpoint' 'x402-gated':1,15 'x402-payment'","prices":[{"id":"8fe9822c-804e-478f-84bd-4302e112a1a0","listingId":"2f122f8e-f44f-4419-b6b7-ab42a777357d","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/13/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":"2026-04-18T18:58:24.361Z"}],"sources":[{"listingId":"2f122f8e-f44f-4419-b6b7-ab42a777357d","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/transactions/13/receipt","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:58:24.361Z","lastSeenAt":"2026-04-25T01:32:59.813Z"}],"details":{"listingId":"2f122f8e-f44f-4419-b6b7-ab42a777357d","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/transactions/13/receipt\n# Returns 402 with x402 challenge. Attach X-PAYMENT header with valid USDC payment proof to receive the receipt.","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 of USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/transactions/13/receipt"},{"claim":"The platform advertises $0.02 per request across all API categories with no API keys, no rate limits, and instant access on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/transactions/13/receipt"},{"claim":"Docs, API, pricing, and README pages render only a 'Connect wallet' prompt","source_url":"https://lowpaymentfee.com/docs"}],"useCases":["Retrieving a transaction receipt for transaction ID 13 via a paid x402 call","Demonstrating x402 protocol integration with USDC on Base","Testing micropayment-gated API access without API keys"],"bestFor":["Developers experimenting with x402 protocol payments","Agents that need to make small USDC-settled API calls on Base","Projects exploring keyless, pay-per-use API access patterns"],"notFor":["Production workloads requiring documented request/response schemas","Bulk data retrieval or high-throughput analytics","Users without a Base-compatible USDC wallet"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:44.202Z"},"updatedAt":"2026-04-25T01:32:59.813Z"}}