x402basequality 0.30

Pay-per-call API platform on Base (USDC) via x402 — $0.02/request, no API keys required.

Price
0.02 USDC / call
Protocol
x402
Verified
no
Endpoint
https://lowpaymentfee.com/api/v1/payments/138

What it does

lowpaymentfee.com is a pay-per-request API platform that uses the x402 protocol to accept USDC payments on the Base network. The specific endpoint `/api/v1/payments/138` is listed as "Premium API Access" and charges up to 20,000 base units of USDC (i.e., $0.02) per call. The platform advertises no API keys, no rate limits, and instant access — you simply attach an x402 payment header to each request.

The broader platform offers endpoints across four categories: Data & Analytics (metrics, reports, data export, insights), AI & Machine Learning (sentiment analysis, text summarization, classification, embeddings), Finance & Web3 (price feeds, exchange rates, token quotes, gas estimates), and Infrastructure utilities (geocoding, validation, conversion, generation). All endpoints are listed at the same $0.02/request price point.

This particular endpoint (`/api/v1/payments/138`) is labeled generically as "Premium API Access" and does not appear in the main site's listed API catalog. There is no documentation, OpenAPI schema, or example request/response available for this specific endpoint, so its exact functionality is unclear. The x402 challenge confirms it is live and accepting POST requests, settling payments to address `0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3` in USDC on Base.

Capabilities

x402-paymentusdc-base-networkpay-per-requestno-api-keypost-methodjson-response

Use cases

  • —Accessing premium API functionality with per-request USDC micropayments
  • —Integrating pay-as-you-go API calls into agent workflows without managing API keys
  • —Testing x402 protocol payment flows on Base network

Fit

Best for

  • —Developers wanting zero-signup, pay-per-call API access
  • —AI agents that can settle x402 payments autonomously
  • —Users who prefer crypto micropayments over subscription billing

Not for

  • —Users needing detailed API documentation or guaranteed SLAs
  • —High-volume consumers who would benefit from bulk pricing or subscriptions
  • —Anyone without a Base-network USDC wallet

Quick start

curl -X POST https://lowpaymentfee.com/api/v1/payments/138 \
  -H "Content-Type: application/json" \
  -H "X-PAYMENT: <x402-payment-token>"

Endpoint

URLhttps://lowpaymentfee.com/api/v1/payments/138
Transporthttp
Protocolx402
Pay to0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3
CurrencyUSD COIN

Quality

0.30/ 1.00

The x402 challenge is live and confirms pricing and payment details, but there is no documentation, no OpenAPI schema, no example requests or responses, and the specific endpoint's functionality is entirely undescribed. The endpoint path (/api/v1/payments/138) does not match any of the documented APIs on the site. This is effectively a stub listing.

Warnings

  • —No documentation, OpenAPI spec, or usage examples available for this specific endpoint
  • —Endpoint path /api/v1/payments/138 does not appear in the site's published API catalog — its actual functionality is unknown
  • —Docs, pricing, API, and README pages all returned only 'Connect wallet' with no substantive content
  • —No input or output schema provided beyond the basic x402 challenge metadata

Citations

Provenance

Indexed fromx402_bazaar
Enriched2026-04-19 06:38:28Z · anthropic/claude-opus-4.6 · v2
First seen2026-04-18
Last seen2026-04-24

Agent access

JSONhttps://clawmart.sh/api/listings/q6JzAm
Pay-per-call API platform on Base (USDC) via x402 — $0.02/request, no API keys required. — Clawmart · Clawmart