x402-gated Stripe invoice endpoint on Base, paid per-call in USDC.
What it does
This endpoint at lowpaymentfee.com provides access to a Stripe invoice resource (invoice ID 120) behind an x402 payment wall. The provider operates a broader platform offering dozens of pay-per-request API endpoints spanning data analytics, AI/ML inference, finance/Web3 data, and utility services — all gated via the x402 protocol on the Base network and settled in USDC.
The specific endpoint `/api/v1/stripe/invoices/120` accepts POST requests and returns JSON. The x402 challenge advertises a maximum cost of 20,000 base units of USDC (0x8335…2913 on Base), which equals $0.02 per request (USDC uses 6 decimals). The provider's landing page confirms a flat $0.02/request pricing model across all endpoints with no API keys, no rate limits, and no minimum commitments required.
Documentation is extremely sparse — the /docs, /api, /pricing, and /README pages all render only a "Connect wallet" prompt with no further technical detail. There is no OpenAPI spec, no request/response schema documentation, and no usage examples available. The exact data returned by this invoice endpoint is unknown beyond the stated mime type of application/json. The endpoint is confirmed live via a valid 402 challenge response.
Capabilities
Use cases
- —Retrieving Stripe invoice data without traditional API key management
- —Agent-driven invoice lookups settled in USDC on Base
- —Programmatic access to invoice #120 via micropayment
Fit
Best for
- —Agents or services that need on-demand Stripe invoice data with crypto-native payment
- —Developers exploring x402 protocol integrations
- —Use cases requiring keyless, pay-as-you-go API access
Not for
- —Users needing bulk invoice retrieval or batch operations (no documented batch support)
- —Anyone requiring detailed API documentation or guaranteed SLAs before integration
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/stripe/invoices/120 \
-H "X-PAYMENT: <x402-payment-token>" \
-H "Content-Type: application/json"Endpoint
Quality
The endpoint is live and returns a valid x402 challenge with clear pricing ($0.02/request in USDC on Base). However, there is no OpenAPI spec, no request/response schema, no documentation beyond a wallet-connect prompt, and no examples. The purpose of this specific invoice endpoint is unclear beyond its URL path.
Warnings
- —No API documentation available — /docs, /api, /pricing, and /README pages all show only 'Connect wallet'
- —No OpenAPI or schema definition found; request body and response structure are entirely unknown
- —The specific purpose of /api/v1/stripe/invoices/120 is undocumented — it may expose third-party Stripe invoice data, raising potential data-handling concerns
- —No rate limit or SLA information provided
Citations
- —The endpoint returns a valid x402 challenge with maxAmountRequired of 20000 base units of USDC on Basehttps://lowpaymentfee.com/api/v1/stripe/invoices/120
- —The provider advertises $0.02/request flat pricing with no API keys, no rate limits, and instant access on Base networkhttps://lowpaymentfee.com
- —USDC asset contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913https://lowpaymentfee.com/api/v1/stripe/invoices/120