{"id":"2c239c0e-4d86-4f04-bd8c-5b0f8fd236e9","shortId":"efMmDq","kind":"x402","title":"Transaction receipt endpoint on Base, paid per-call via x402 with USDC.","tagline":"Transaction receipt endpoint on Base, paid per-call via x402 with USDC.","description":"This endpoint at lowpaymentfee.com provides a transaction receipt for transaction ID 150 via a POST request, gated by the x402 payment protocol. It is part of a broader platform (lowpaymentfee.com) that offers a variety of 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/150/receipt` returns a JSON response upon successful payment. The x402 challenge confirms the endpoint is live, accepting exact-scheme payments of up to 20,000 base units of USDC (0x8335…2913 on Base), which equals $0.02 given USDC's 6 decimals. Payment is sent to address 0x1A2B…85F3 with a 300-second timeout. No API keys or rate limits are advertised; access is granted purely through per-request micropayment.\n\nDocumentation on the site is extremely thin — the docs, API, pricing, 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 challenge's outputSchema stub, and no explanation of what the receipt payload contains. The platform appears to be a demonstration or early-stage deployment of x402-gated APIs rather than a mature production service.","tags":[],"capabilities":["x402-payment","usdc-micropayment","base-network","transaction-receipt","per-call-billing","no-api-key"],"categories":["finance","infrastructure"],"synonyms":["transaction receipt API","x402 micropayment API","USDC pay-per-call","Base network API","lowpaymentfee","crypto payment gateway","web3 API"],"warnings":["No OpenAPI or schema documentation available — response payload is unknown","All documentation pages (docs, API, pricing, README) return only a 'Connect wallet' prompt with no content","The endpoint path is hardcoded to transaction ID 150; it is unclear whether other IDs are supported or what the transaction refers to","Platform appears to be early-stage or a demo; reliability and longevity are uncertain"],"endpointUrl":"https://lowpaymentfee.com/api/v1/transactions/150/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/150/receipt","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.300","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 the docs pages are empty. The purpose and contents of the receipt response are unknown, making this effectively a stub 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'0.02':78,128 '000':117 '0x1a2b':139 '0x8335':122 '150':38 '20':116 '2913':123 '300':143 '6':132 '85f3':140 'Base network API' 'USDC pay-per-call' 'accept':108 'access':154 'address':138 'advertis':153 'ai':67 'analyt':66 'api':62,147,172,228 'appear':214 'base':5,18,87,118,125 'base-network' 'beyond':196 'broader':54 'call':9,22 'categori':63 'challeng':102,199 'confirm':103 'connect':181 'contain':211 'content':187 'crypto payment gateway' 'data':65 'decim':133 'demonstr':218 'deploy':223 'doc':171 'document':163 'earli':221 'early-stag':220 'endpoint':3,16,28,91,105 'equal':127 'exact':110 'exact-schem':109 'explan':205 'extrem':168 'financ':70 'gate':43,227 'given':129 'grant':156 'id':37 'includ':64 'infrastructur':73 'json':95 'key':148 'learn':69 'limit':151 'live':107 'lowpaymentfee' 'lowpaymentfee.com':30,56 'machin':68 'matur':232 'micropay':162 'network':88 'no-api-key' 'offer':58 'openapi':191 'outputschema':201 'page':176 'paid':6,19 'part':51 'payload':210 'payment':47,99,112,134 'per':8,21,79,160 'per-cal':7,20 'per-call-billing' 'per-request':159 'platform':55,213 'post':41 'price':76,173 'product':233 'prompt':183 'protocol':48 'provid':31 'pure':157 'rate':150 'rather':229 'readm':175 'receipt':2,15,34,209 'render':178 'request':42,80,161 'request/response':194 'respons':96 'return':93 'schema':195 'scheme':111 'second':144 'sent':136 'servic':234 'settl':82 'site':166 'spec':192 'specif':90 'stage':222 'stub':202 'substant':186 'success':98 'thin':169 'timeout':145 'transact':1,14,33,36 'transaction receipt API' 'transaction-receipt' 'unit':119 'upon':97 'usdc':13,26,84,121,130 'usdc-micropayment' 'util':74 'varieti':60 'via':10,23,39 'wallet':182 'web3':71 'web3 API' 'x402':11,24,46,101,198,226 'x402 micropayment API' 'x402-gated':225 'x402-payment'","prices":[{"id":"82d8ecc5-73b2-4387-b6d7-c696562a9556","listingId":"2c239c0e-4d86-4f04-bd8c-5b0f8fd236e9","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/150/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":"2026-04-18T18:58:46.108Z"}],"sources":[{"listingId":"2c239c0e-4d86-4f04-bd8c-5b0f8fd236e9","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/transactions/150/receipt","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:58:46.108Z","lastSeenAt":"2026-04-24T22:32:56.436Z"}],"details":{"listingId":"2c239c0e-4d86-4f04-bd8c-5b0f8fd236e9","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/transactions/150/receipt\n# Returns 402 with x402 challenge; attach X-PAYMENT header with signed USDC payment to complete.","exampleRequest":null,"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"Endpoint returns 402 with x402 challenge, maxAmountRequired 20000 base units of USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/transactions/150/receipt"},{"claim":"USDC asset contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/transactions/150/receipt"},{"claim":"Platform advertises $0.02 per request, no API keys, no rate limits, Base network","source_url":"https://lowpaymentfee.com"},{"claim":"Docs, API, pricing, and README pages render only 'Connect wallet' with no documentation content","source_url":"https://lowpaymentfee.com/docs"}],"useCases":["Retrieving a receipt for a specific transaction via micropayment","Demonstrating x402 protocol payment flows for API access","Integrating pay-per-call API access without API key management"],"bestFor":["Developers experimenting with x402 payment protocol","Agents that need keyless, pay-per-call API access on Base","Prototyping micropayment-gated API workflows"],"notFor":["Production workloads requiring documented request/response schemas","Bulk or high-volume receipt retrieval (no batch endpoint visible)","Users who need fiat-only payment rails"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:43.175Z"},"updatedAt":"2026-04-24T22:32:56.436Z"}}