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/390

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 lowpaymentfee.com platform, which hosts a collection of pay-per-request APIs spanning data & analytics, AI & machine learning, finance & Web3, and infrastructure utilities. All endpoints are priced at $0.02 per request, settled in USDC on the Base network, with no API keys, rate limits, or commitments required.

The specific endpoint `/api/v1/payments/390` returned a live 402 challenge confirming it accepts x402 exact-scheme payments. The maxAmountRequired is 20000 base units of USDC (0x8335…2913 on Base), which equals $0.02 given USDC's 6 decimals. The payment is sent to address 0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3 with a 300-second timeout. The endpoint accepts POST requests and returns application/json.

Documentation on the site 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 this particular endpoint (`/payments/390`) actually returns or what input it expects. The platform's landing page lists many other endpoints with brief labels, but this specific path does not appear among them, making its purpose unclear. Treat this as a stub listing until more documentation becomes available.

Capabilities

x402-paymentusdc-basepay-per-requestjson-responseno-api-keypost-method

Use cases

  • —Accessing premium API data with per-request USDC micropayments on Base
  • —Agent-driven workflows that need keyless, pay-as-you-go API access
  • —Testing x402 payment protocol integrations against a live endpoint

Fit

Best for

  • —Developers experimenting with x402 payment protocol
  • —Agents that can settle USDC payments on Base L2
  • —Use cases requiring no-signup, no-API-key access to paid endpoints

Not for

  • —Users who need detailed API documentation or OpenAPI specs before integrating
  • —Applications requiring free or fiat-settled API access

Quick start

curl -X POST https://lowpaymentfee.com/api/v1/payments/390 \
  -H "Content-Type: application/json" \
  -H "X-PAYMENT: <x402-payment-token>"

Endpoint

URLhttps://lowpaymentfee.com/api/v1/payments/390
Transporthttp
Protocolx402
Pay to0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3
CurrencyUSD COIN

Quality

0.25/ 1.00

The endpoint is live and returns a valid x402 402 challenge, confirming pricing and payment details. However, there is no documentation, no OpenAPI schema, no request/response examples, and the specific endpoint path (/payments/390) is not described anywhere on the site. This is effectively a stub.

Warnings

  • —No documentation available — docs, API, pricing, and README pages all show only 'Connect wallet' with no content.
  • —The endpoint path /api/v1/payments/390 does not appear in the site's listed API catalog; its specific purpose is unknown.
  • —No OpenAPI schema or request/response examples are provided.
  • —No information on what input the POST body should contain or what the response looks like.

Citations

Provenance

Indexed fromx402_bazaar
Enriched2026-04-19 07:15:18Z · anthropic/claude-opus-4.6 · v2
First seen2026-04-18
Last seen2026-04-23

Agent access

JSONhttps://clawmart.sh/api/listings/A4qd8T
Pay-per-call premium API access on Base via x402 — $0.02/request in USDC. — Clawmart · Clawmart