x402basequality 0.25

Pay-per-call premium API access on Base via x402 — $0.02/request in USDC.

Price
0.02 USDC / call
Protocol
x402
Verified
no
Endpoint
https://lowpaymentfee.com/api/v1/payments/19

What it does

This endpoint at lowpaymentfee.com provides "Premium API Access" via the x402 payment protocol. It is one of many endpoints offered by the platform, which spans data & analytics, AI & machine learning, finance & Web3, and infrastructure utility categories — all priced at $0.02 per request, paid in USDC on the Base network.

The specific endpoint `/api/v1/payments/19` is labeled "Premium API Access" in the x402 challenge but its exact functionality is not documented beyond that label. The platform advertises no API keys, no rate limits, and instant access — callers simply attach an x402 payment header with each request. The x402 challenge confirms the endpoint is live, accepts POST requests, requires up to 20,000 base units of USDC (i.e., $0.02 given USDC's 6 decimals) per call, and settles to address `0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3` on Base.

Documentation is extremely sparse. The docs, API, pricing, and README pages all render only a "Connect wallet" prompt with no further content. There is no OpenAPI schema, no request/response examples, and no description of what data or functionality this particular endpoint returns. The platform's landing page lists sibling endpoints across several domains but does not detail input parameters or response formats for any of them.

Capabilities

x402-paymentusdc-basepay-per-requestno-api-keypost-method

Use cases

  • —Programmatic pay-per-call access to a premium API without managing API keys or subscriptions
  • —Agent-driven workflows that need to pay for API calls on-the-fly using USDC on Base
  • —Exploring x402 payment protocol integrations with low per-request costs

Fit

Best for

  • —Developers experimenting with x402 payment-gated APIs
  • —Agents that need keyless, on-demand API access settled in USDC
  • —Low-volume or bursty usage patterns where per-call pricing is preferable to subscriptions

Not for

  • —Users who need detailed documentation or guaranteed SLAs before integrating
  • —High-volume production workloads where $0.02/request adds up and bulk pricing is needed
  • —Anyone who cannot transact in USDC on the Base network

Quick start

curl -X POST https://lowpaymentfee.com/api/v1/payments/19 \
  -H "Content-Type: application/json" \
  -H "X-PAYMENT: <x402-payment-token>"

Endpoint

URLhttps://lowpaymentfee.com/api/v1/payments/19
Transporthttp
Protocolx402
Pay to0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3
CurrencyUSD COIN

Quality

0.25/ 1.00

The endpoint is live and returns a valid x402 challenge, but there is virtually no documentation: no OpenAPI schema, no request/response examples, no description of what the endpoint actually does beyond the generic label "Premium API Access." All doc pages return only a wallet-connect prompt. This is effectively a stub listing.

Warnings

  • —No documentation available — docs, API, pricing, and README pages all show only 'Connect wallet' with no content.
  • —The exact functionality of /api/v1/payments/19 ('Premium API Access') is undocumented; it is unclear what data or service it provides.
  • —No OpenAPI schema, no request parameters, and no response format are described anywhere.
  • —The platform lists many sibling endpoints but none have detailed documentation visible in the crawl.

Citations

Provenance

Indexed fromx402_bazaar
Enriched2026-04-19 06:46:18Z · anthropic/claude-opus-4.6 · v2
First seen2026-04-18
Last seen2026-04-23

Agent access

JSONhttps://clawmart.sh/api/listings/hqYPSs
Pay-per-call premium API access on Base via x402 — $0.02/request in USDC. — Clawmart · Clawmart