{"id":"868795f0-3e34-441c-8137-b54cbccc75eb","shortId":"jLh6Xf","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 35) 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/35/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 immediately upon valid payment.\n\nDocumentation 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 beyond the x402 challenge's `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-settlement","base-network","transaction-receipt","per-call-pricing","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":["Documentation pages (/docs, /pricing, /api, /README) all render only 'Connect wallet' with no usable content.","No OpenAPI or schema describing request parameters or response format.","The specific resource (transaction 35 receipt) is opaque — no explanation of what it returns.","Platform may be a demo or early-stage project; production readiness is unclear."],"endpointUrl":"https://lowpaymentfee.com/api/v1/transactions/35/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/35/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 the docs pages are empty stubs. The purpose and content of the receipt resource is unexplained, making this effectively a stub 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'0.02':71,127 '000':123 '0x8335':116 '20':122 '35':40 '402':102 '6':131 'Base network API' 'USDC micropayment API' 'accept':86,106 'access':141 'actual':193 'advertis':53,140 'ai':60 'amount':120 'analyt':59 'api':55,134,155,213 'appear':197 'application/json':91 'asset':112 'base':8,22,80,115,124 'base-network' 'behind':41 'beyond':178 'broader':50 'call':12,26 'caller':99 'categori':56 'challeng':103,181 'connect':163 'contain':104,194 'content':169 'contract':113 'data':58 'decim':132 'demonstr':201 'doc':153 'document':148 'earli':204 'early-stag':203 'endpoint':6,20,30,84 'exact':109 'explan':187 'extrem':150 'financ':63 'gate':3,17 'given':128 'grant':143 'handl':94 'i.e':126 'id':39 'immedi':144 'includ':57 'infrastructur':66 'key':135 'learn':62 'limit':138 'lowpaymentfee' 'lowpaymentfee.com':32 'machin':61 'matur':211 'maximum':119 'multipl':54 'network':81 'no-api-key' 'openapi':173 'outputschema':183 'page':158 'paid':9,23 'part':47 'pay-per-call API' 'payload':192 'payment':92,107,147 'paywal':44 'per':11,25,72 'per-cal':10,24 'per-call-pricing' 'platform':51,196 'post':87 'price':69,154 'product':212 'prompt':165 'protocol':98 'provid':33 'rate':137 'rather':208 'readm':157 'receipt':5,19,36,191 'receiv':100 'render':160 'request':73,88 'request/response':176 'resourc':37 'return':90 'schema':177 'scheme':108 'settl':75 'showcas':207 'spars':151 'spec':174 'specif':83 'stage':205 'stub':184 'transact':4,18,35,38 'transaction receipt API' 'transaction-receipt' 'unit':125 'upon':145 'usdc':14,28,77,111,129 'usdc-settlement' 'util':67 'valid':146 'via':95 'wallet':164 'web3':64 'x402':2,16,43,97,180,206 'x402 payment endpoint' 'x402-gated':1,15 'x402-payment'","prices":[{"id":"ab44161a-51d8-47a7-b747-881c1ac2c3a4","listingId":"868795f0-3e34-441c-8137-b54cbccc75eb","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/35/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":"2026-04-18T19:26:25.873Z"}],"sources":[{"listingId":"868795f0-3e34-441c-8137-b54cbccc75eb","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/transactions/35/receipt","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T19:26:25.873Z","lastSeenAt":"2026-04-24T06:32:42.842Z"}],"details":{"listingId":"868795f0-3e34-441c-8137-b54cbccc75eb","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/transactions/35/receipt\n# Returns 402 with x402 challenge; attach X-PAYMENT header with valid USDC payment 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 in USDC on Base network","source_url":"https://lowpaymentfee.com/api/v1/transactions/35/receipt"},{"claim":"The platform advertises $0.02 per request 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/35/receipt"},{"claim":"Docs, pricing, API, and README pages render only 'Connect wallet'","source_url":"https://lowpaymentfee.com/docs"}],"useCases":["Retrieving a transaction receipt for transaction ID 35 via a paid API call","Demonstrating x402 protocol payment flows on Base","Integrating per-call USDC micropayments into agent workflows"],"bestFor":["Developers experimenting with x402 payment protocol","Agents that need to make one-off paid API calls without API keys","Testing USDC micropayment integrations on Base"],"notFor":["Production workloads requiring documented request/response schemas","Bulk or high-volume data retrieval with predictable SLAs","Users who need fiat or non-crypto payment options"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:37.917Z"},"updatedAt":"2026-04-24T06:32:42.842Z"}}