{"id":"ddca0b3b-a35e-42d6-ac18-c390b75383c6","shortId":"9HMD8L","kind":"x402","title":"x402-gated transaction receipt endpoint on Base, paying $0.02 in USDC per request.","tagline":"x402-gated transaction receipt endpoint on Base, paying $0.02 in USDC per request.","description":"This endpoint at lowpaymentfee.com provides a transaction receipt resource (transaction ID 267) behind an x402 paywall. It is part of a broader platform offering 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 call and settled in USDC on the Base network.\n\nThe specific endpoint `/api/v1/transactions/267/receipt` accepts POST requests and returns JSON. Payment is handled via the x402 protocol: callers must include an `X-PAYMENT` header with a valid payment proof. The challenge advertises a `maxAmountRequired` of 20,000 base units of USDC (0x8335…2913 on Base), which equals $0.02 given USDC's 6 decimals. The payment scheme is \"exact\" with a 300-second timeout. No API keys or rate limits are advertised; access is entirely gated by micropayment.\n\nDocumentation on the site 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 schema documentation, and no usage examples. The platform lists many other endpoints (analytics, AI, finance, utilities) at the same $0.02 price point, but details on what data each returns are not available from the crawled material.","tags":[],"capabilities":["x402-payment","usdc-micropayment","base-network","transaction-receipt","pay-per-request","no-api-key","json-response"],"categories":["finance","infrastructure"],"synonyms":["transaction receipt API","x402 micropayment API","USDC pay-per-call","Base network API","lowpaymentfee","402 payment required endpoint","crypto-gated API"],"warnings":["No OpenAPI or schema documentation available — request and response formats are unknown.","Docs, pricing, API, and README pages all render only 'Connect wallet' with no usable content.","The specific data returned by this transaction receipt endpoint is undocumented.","The platform lists many endpoints but none have documented schemas or examples."],"endpointUrl":"https://lowpaymentfee.com/api/v1/transactions/267/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/267/receipt","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.350","qualityRationale":"The endpoint is live and returns a valid x402 challenge with clear pricing, but there is no OpenAPI spec, no request/response schema, no documentation beyond a wallet-connect prompt, and no examples. The specific purpose of this receipt endpoint is unclear beyond its URL path. Effectively a stub 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'0.02':10,24,74,133,214 '000':122 '0x8335':127 '20':121 '267':40 '2913':128 '300':146 '402 payment required endpoint' '6':137 'Base network API' 'USDC pay-per-call' 'accept':89 'access':157 'advertis':117,156 'ai':208 'ai/ml':64 'analyt':63,207 'api':60,150,173 'avail':226 'base':8,22,83,123,130 'base-network' 'behind':41 'broader':50 'call':76 'caller':102 'challeng':116 'connect':181 'content':187 'crawl':229 'crypto-gated API' 'data':62,67,221 'decim':138 'detail':218 'doc':171 'document':163,196 'endpoint':6,20,30,87,206 'entir':159 'equal':132 'exact':143 'exampl':200 'extrem':168 'financ':209 'finance/web3':66 'gate':3,17,160 'given':134 'handl':97 'header':109 'id':39 'includ':104 'infer':65 'json':94 'json-response' 'key':151 'limit':154 'list':203 'lowpaymentfee' 'lowpaymentfee.com':32 'mani':204 'materi':230 'maxamountrequir':119 'micropay':162 'must':103 'network':84 'no-api-key' 'offer':52 'openapi':191 'page':176 'part':47 'pay':9,23,57 'pay-per-request':56 'payment':95,108,113,140 'paywal':44 'per':13,27,58,75 'platform':51,202 'point':216 'post':90 'price':72,172,215 'prompt':183 'proof':114 'protocol':101 'provid':33 'rate':153 'readm':175 'receipt':5,19,36 'render':178 'request':14,28,59,91 'request/response':194 'resourc':37 'return':93,223 'schema':195 'scheme':141 'second':147 'servic':70 'settl':78 'site':166 'span':61 'spars':169 'spec':192 'specif':86 'timeout':148 'transact':4,18,35,38 'transaction receipt API' 'transaction-receipt' 'unit':124 'usag':199 'usdc':12,26,80,126,135 'usdc-micropayment' 'util':69,210 'valid':112 'varieti':54 'via':98 'wallet':182 'x':107 'x-payment':106 'x402':2,16,43,100 'x402 micropayment API' 'x402-gated':1,15 'x402-payment'","prices":[{"id":"9486ac2e-1d62-4c32-9428-c82b57b7430a","listingId":"ddca0b3b-a35e-42d6-ac18-c390b75383c6","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/267/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":"2026-04-18T18:59:41.807Z"}],"sources":[{"listingId":"ddca0b3b-a35e-42d6-ac18-c390b75383c6","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/transactions/267/receipt","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:59:41.807Z","lastSeenAt":"2026-04-24T15:03:06.642Z"}],"details":{"listingId":"ddca0b3b-a35e-42d6-ac18-c390b75383c6","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/transactions/267/receipt\n# Returns 402 with x402 challenge; include X-PAYMENT header with valid payment proof 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 of USDC on Base network","source_url":"https://lowpaymentfee.com/api/v1/transactions/267/receipt"},{"claim":"USDC asset contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/transactions/267/receipt"},{"claim":"All APIs are priced at $0.02 per request with no API keys, no rate limits, and instant access on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"The platform offers endpoints across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"}],"useCases":["Retrieving a transaction receipt for transaction 267 via micropayment","Demonstrating x402 protocol integration for pay-per-request APIs","Agent-driven data retrieval without API key management"],"bestFor":["Developers experimenting with x402 protocol payments","Agents that need keyless, pay-per-call API access on Base","Low-volume consumers who prefer micropayments over subscriptions"],"notFor":["Users needing detailed API documentation or schemas before integrating","High-volume batch retrieval where per-request fees add up","Anyone without a Base-network USDC wallet"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:40.547Z"},"updatedAt":"2026-04-24T15:03:06.642Z"}}