{"id":"928058d5-b176-4fec-8498-d9badf99d52e","shortId":"Auu5P9","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 (specifically for transaction ID 326) behind an x402 paywall. It is part of a broader platform that offers a variety of pay-per-request APIs spanning data analytics, AI/ML inference, finance/Web3 data, and infrastructure utilities — all priced at $0.02 per call, settled in USDC on the Base network.\n\nThe specific endpoint `/api/v1/transactions/326/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 accepted asset is USDC (contract `0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913` on Base) with a maximum amount of 20,000 base units, which equals $0.02 (USDC uses 6 decimals). The payment timeout is 300 seconds.\n\nThe platform advertises no API keys, no rate limits, and instant access. However, documentation pages (`/docs`, `/pricing`, `/api`, `/README`) all resolve to a minimal \"Connect wallet\" prompt with no substantive content. There is no OpenAPI schema, no request/response examples, and no detailed documentation available. The actual data returned by this receipt endpoint is unknown — it could be a transaction receipt, a proof of payment, or similar. The broader platform lists many endpoints but their actual functionality and data quality cannot be verified from available materials.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","transaction-receipt","pay-per-request","json-response","no-api-key"],"categories":["finance","infrastructure"],"synonyms":["transaction receipt API","x402 API","USDC micropayment API","Base network API","pay-per-call API","lowpaymentfee","crypto payment endpoint"],"warnings":["No documentation available — all doc pages (/docs, /pricing, /api, /README) render only a 'Connect wallet' prompt with no content","No OpenAPI or schema describing request parameters or response format","Endpoint is scoped to a single transaction ID (326); unclear if this is a demo or production resource","Actual response payload is unknown — cannot verify what data is returned","Broader platform lists many endpoints but none have verifiable documentation or examples"],"endpointUrl":"https://lowpaymentfee.com/api/v1/transactions/326/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/326/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 (returns a valid 402 x402 challenge) and pricing is clear ($0.02 USDC on Base). However, there is no OpenAPI schema, no request/response examples, no meaningful documentation (all doc pages show only 'Connect wallet'), and the actual data returned is completely unknown. The endpoint is scoped to a single hardcoded transaction ID (326), which limits general 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'/api/v1/transactions/326/receipt':90 '/docs':163 '/pricing':164 '/readme':166 '0.02':10,24,77,137 '000':132 '0x833589fcd6edb6e08f4c7c32d4f71b54bda02913':123 '20':131 '300':146 '326':42 '6':140 'Base network API' 'USDC micropayment API' 'accept':91,118 'access':159 'actual':193,222 'advertis':150 'ai/ml':67 'amount':129 'analyt':66 'api':63,152 'asset':119 'avail':191,231 'base':8,22,85,125,133 'base-network' 'behind':43 'broader':52,215 'call':79 'caller':104 'cannot':227 'connect':172 'content':178 'contract':122 'could':203 'crypto payment endpoint' 'data':65,70,194,225 'decim':141 'detail':189 'document':161,190 'endpoint':6,20,30,89,199,219 'equal':136 'exampl':186 'finance/web3':69 'function':223 'gate':3,17 'handl':99 'header':111 'howev':160 'id':41 'includ':106 'infer':68 'infrastructur':72 'instant':158 'json':96 'json-response' 'key':153 'limit':156 'list':217 'lowpaymentfee' 'lowpaymentfee.com':32 'mani':218 'materi':232 'maximum':128 'minim':171 'must':105 'network':86 'no-api-key' 'offer':55 'openapi':182 'page':162 'part':49 'pay':9,23,60 'pay-per-call API' 'pay-per-request':59 'payment':97,110,115,143,211 'paywal':46 'per':13,27,61,78 'platform':53,149,216 'post':92 'price':75 'prompt':174 'proof':116,209 'protocol':103 'provid':33 'qualiti':226 'rate':155 'receipt':5,19,36,198,207 'request':14,28,62,93 'request/response':185 'resolv':168 'resourc':37 'return':95,195 'schema':183 'second':147 'settl':80 'similar':213 'span':64 'specif':38,88 'substant':177 'timeout':144 'transact':4,18,35,40,206 'transaction receipt API' 'transaction-receipt' 'unit':134 'unknown':201 'usdc':12,26,82,121,138 'usdc-settlement' 'use':139 'util':73 'valid':114 'varieti':57 'verifi':229 'via':100 'wallet':173 'x':109 'x-payment':108 'x402':2,16,45,102 'x402 API' 'x402-gated':1,15 'x402-payment'","prices":[{"id":"75b8103c-91e2-4942-99ea-2bfbdf93ed21","listingId":"928058d5-b176-4fec-8498-d9badf99d52e","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/326/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":"2026-04-18T19:26:08.920Z"}],"sources":[{"listingId":"928058d5-b176-4fec-8498-d9badf99d52e","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/transactions/326/receipt","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T19:26:08.920Z","lastSeenAt":"2026-04-24T09:04:27.431Z"}],"details":{"listingId":"928058d5-b176-4fec-8498-d9badf99d52e","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/transactions/326/receipt \\\n  -H \"X-PAYMENT: <x402-payment-proof>\" \\\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 a 402 x402 challenge with maxAmountRequired of 20000 base units in USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/transactions/326/receipt"},{"claim":"USDC asset contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/transactions/326/receipt"},{"claim":"Platform advertises $0.02 per request, no API keys, no rate limits, instant access","source_url":"https://lowpaymentfee.com"},{"claim":"Documentation pages resolve to minimal 'Connect wallet' content only","source_url":"https://lowpaymentfee.com/docs"}],"useCases":["Retrieving a transaction receipt for transaction 326 via a single micropayment","Demonstrating x402 protocol integration for pay-per-request APIs","Programmatic access to receipt data without API key management"],"bestFor":["Developers experimenting with x402 payment protocol","Agents that can settle USDC payments on Base","Use cases requiring keyless, pay-per-call API access"],"notFor":["Production workloads requiring documented schemas and SLAs","Users who need non-crypto payment methods","Bulk retrieval of multiple transaction receipts (endpoint is scoped to a single transaction ID)"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:38.722Z"},"updatedAt":"2026-04-24T09:04:27.431Z"}}