{"id":"eb9b1c73-b964-4263-acfb-1158faf95583","shortId":"ERRmLB","kind":"x402","title":"Pay-per-call transaction receipt endpoint on Base via x402, priced at $0.02 in USDC.","tagline":"Pay-per-call transaction receipt endpoint on Base via x402, priced at $0.02 in USDC.","description":"This x402-enabled endpoint at lowpaymentfee.com provides a \"Premium API Access\" receipt resource for transaction ID 190. It is part of a broader platform offering dozens of pay-per-request API endpoints spanning data analytics, AI/ML inference, finance/Web3 data, and infrastructure utilities — all settled on the Base network using USDC at $0.02 per request via the x402 protocol.\n\nThe specific endpoint `/api/v1/transactions/190/receipt` accepts POST requests and returns JSON. The x402 challenge confirms it is live, requiring an exact payment of 20,000 base units of USDC (0x8335…2913 on Base, 6 decimals = $0.02) to wallet 0x1A2B…85F3 with a 300-second timeout. No API keys or rate limits are advertised; access is gated purely by micropayment.\n\nDocumentation beyond the landing page 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 documentation, and no usage examples. The exact purpose of the \"transaction receipt\" resource (whether it returns a receipt for a prior payment, or serves some other function) is unclear from available materials. The broader platform lists many endpoints but provides no detailed documentation for any of them.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","pay-per-request","json-response","transaction-receipt"],"categories":["finance","infrastructure"],"synonyms":["transaction receipt API","x402 micropayment endpoint","USDC pay-per-call","Base network API","lowpaymentfee","premium API access","crypto payment API"],"warnings":["No API documentation available — all doc pages render only 'Connect wallet'","No OpenAPI or JSON schema describing request parameters or response format","The specific purpose of the /transactions/190/receipt endpoint is unclear","The broader platform lists many endpoints but none have documented schemas or examples","Cannot verify what data the endpoint actually returns without paying"],"endpointUrl":"https://lowpaymentfee.com/api/v1/transactions/190/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/190/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 and returns a valid x402 challenge with clear pricing. However, documentation is essentially nonexistent beyond the landing page — /docs, /pricing, /api, and /README all show only 'Connect wallet'. There is no OpenAPI spec, no request/response schema, and no explanation of what this specific receipt endpoint actually returns. The purpose of 'transaction 190 receipt' is 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'/api/v1/transactions/190/receipt':96 '/docs':160 '/pricing':162 '/readme':164 '0.02':14,30,86,127 '000':116 '0x1a2b':130 '0x8335':121 '190':50 '20':115 '2913':122 '300':134 '6':125 '85f3':131 'Base network API' 'USDC pay-per-call' 'accept':97 'access':44,145 'advertis':144 'ai/ml':70 'analyt':69 'api':43,65,138 'avail':215 'base':9,25,81,117,124 'base-network' 'beyond':152 'broader':56,218 'call':4,20 'challeng':105 'confirm':106 'connect':170 'content':176 'crypto payment API' 'data':68,73 'decim':126 'detail':226 'document':151,185,227 'dozen':59 'enabl':36 'endpoint':7,23,37,66,95,222 'exact':112,191 'exampl':189 'extrem':157 'finance/web3':72 'function':211 'gate':147 'id':49 'infer':71 'infrastructur':75 'json':102 'json-response' 'key':139 'land':154 'limit':142 'list':220 'live':109 'lowpaymentfee' 'lowpaymentfee.com':39 'mani':221 'materi':216 'micropay':150 'network':82 'offer':58 'openapi':180 'page':155,165 'part':53 'pay':2,18,62 'pay-per-cal':1,17 'pay-per-request':61 'payment':113,206 'per':3,19,63,87 'platform':57,219 'post':98 'premium':42 'premium API access' 'price':12,28 'prior':205 'prompt':172 'protocol':92 'provid':40,224 'pure':148 'purpos':192 'rate':141 'receipt':6,22,45,196,202 'render':167 'request':64,88,99 'request/response':183 'requir':110 'resourc':46,197 'return':101,200 'schema':184 'second':135 'serv':208 'settl':78 'span':67 'spec':181 'specif':94 'thin':158 'timeout':136 'transact':5,21,48,195 'transaction receipt API' 'transaction-receipt' 'unclear':213 'unit':118 'usag':188 'usdc':16,32,84,120 'usdc-settlement' 'use':83 'util':76 'via':10,26,89 'wallet':129,171 'whether':198 'x402':11,27,35,91,104 'x402 micropayment endpoint' 'x402-enabled':34 'x402-payment'","prices":[{"id":"bf4a00ba-f69f-462d-809a-7ecc22ff2dee","listingId":"eb9b1c73-b964-4263-acfb-1158faf95583","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/190/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":"2026-04-18T18:59:10.256Z"}],"sources":[{"listingId":"eb9b1c73-b964-4263-acfb-1158faf95583","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/transactions/190/receipt","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:59:10.256Z","lastSeenAt":"2026-04-24T18:33:04.558Z"}],"details":{"listingId":"eb9b1c73-b964-4263-acfb-1158faf95583","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/transactions/190/receipt \\\n  -H \"X-PAYMENT: <x402-payment-header>\" \\\n  -H \"Content-Type: application/json\"","exampleRequest":null,"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"The endpoint returns HTTP 402 with an x402 challenge requiring 20,000 base units of USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/transactions/190/receipt"},{"claim":"USDC asset contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/transactions/190/receipt"},{"claim":"Platform advertises $0.02 per request, no API keys, no rate limits, Base network","source_url":"https://lowpaymentfee.com"},{"claim":"Platform lists endpoints for analytics, AI/ML, finance, and infrastructure categories","source_url":"https://lowpaymentfee.com"},{"claim":"Documentation pages (/docs, /api, /pricing, /README) show only 'Connect wallet'","source_url":"https://lowpaymentfee.com/docs"}],"useCases":["Retrieving a transaction receipt via micropayment on Base","Programmatic pay-per-call access without API keys","Agent-driven USDC micropayment workflows on Base L2"],"bestFor":["Developers experimenting with x402 micropayment protocols","Agents needing keyless, pay-per-call API access on Base","Users who want to avoid subscription commitments for occasional API calls"],"notFor":["Production workloads requiring detailed API documentation and SLAs","Users who need non-crypto payment methods","High-volume use cases where per-request pricing is inefficient"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:42.066Z"},"updatedAt":"2026-04-24T18:33:04.558Z"}}