x402basequality 0.30

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/139

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/139` is listed as "Premium API Access" but the crawled site does not clarify what this particular resource returns compared to the other named endpoints (e.g., metrics, sentiment analysis, summarization, etc.). The x402 challenge confirms the endpoint is live, accepts POST requests, and requires a payment of up to 20,000 base units of USDC (0x8335…) on Base, which equals $0.02 (USDC uses 6 decimals). Payment is made via the `exact` scheme with a 300-second timeout.

The platform advertises no API keys, no rate limits, and instant access — the only gate is the per-request USDC micropayment. Documentation pages (/docs, /pricing, /api, /README) all returned only a "Connect wallet" prompt with no substantive content, so the actual request/response schema for this endpoint is unknown. Without knowing what data or service this endpoint delivers, agents should treat it as an opaque premium resource until further documentation is available.

Capabilities

x402-paymentusdc-micropaymentbase-networkpay-per-requestno-api-keypost-method

Use cases

  • —Accessing a gated premium resource with per-call USDC micropayments on Base
  • —Integrating x402-compatible agents that pay for API calls automatically
  • —Testing x402 payment flows against a live endpoint

Fit

Best for

  • —Developers experimenting with x402 payment protocol
  • —Agents that can settle USDC micropayments on Base
  • —Use cases needing keyless, pay-per-request API access

Not for

  • —Users who need detailed API documentation or known response schemas before integrating
  • —Applications requiring free or subscription-based access without per-call crypto payments

Quick start

# The endpoint requires an X-PAYMENT header with a valid x402 payment proof.
# Using curl as an example (you need an x402 client to generate the header):
curl -X POST https://lowpaymentfee.com/api/v1/payments/139 \
  -H "Content-Type: application/json" \
  -H "X-PAYMENT: <x402_payment_token>"

Endpoint

URLhttps://lowpaymentfee.com/api/v1/payments/139
Transporthttp
Protocolx402
Pay to0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3
CurrencyUSD COIN

Quality

0.30/ 1.00

The x402 challenge is live and pricing is clear ($0.02 USDC on Base), but there is no documentation, no request/response schema, and no indication of what 'Premium API Access' actually returns. All doc pages render only a wallet-connect prompt. This is effectively a stub listing.

Warnings

  • —No documentation available — /docs, /pricing, /api, and /README all return only 'Connect wallet' with no content.
  • —The purpose and response format of /api/v1/payments/139 ('Premium API Access') is completely undocumented and unclear.
  • —No OpenAPI spec, no output schema beyond the x402 challenge metadata.
  • —This endpoint's name is generic and does not match any of the specifically named endpoints listed on the homepage.

Citations

Provenance

Indexed fromx402_bazaar
Enriched2026-04-19 06:33:24Z · anthropic/claude-opus-4.6 · v2
First seen2026-04-18
Last seen2026-04-22

Agent access

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