x402basequality 0.35

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/229

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/229` is listed as "Premium API Access" and charges up to 20,000 base units of USDC (i.e., $0.02 given USDC's 6 decimals) per call. No API keys, accounts, or rate limits are advertised — callers simply attach an X-PAYMENT header with a valid x402 payment proof.

The broader platform advertises multiple API 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. Payments settle to address `0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3` using USDC (`0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913`) on Base.

Note that the specific endpoint probed (`/api/v1/payments/229`) does not clearly map to any of the documented API categories on the landing page. Documentation pages (/docs, /pricing, /README) returned only a "Connect wallet" prompt with no substantive content, so the actual request/response schemas for this endpoint are unknown. The endpoint is confirmed live (returns a proper 402 x402 challenge), but without documentation or example payloads, the exact functionality behind "Premium API Access" remains unclear.

Capabilities

x402-paymentusdc-basepay-per-requestno-api-keyjson-responsepost-method

Use cases

  • —Programmatic access to paid API endpoints without account registration or API keys
  • —Agent-driven workflows that need to pay per call using on-chain USDC on Base
  • —Testing x402 protocol integrations with a low-cost endpoint

Fit

Best for

  • —Developers experimenting with x402 payment protocol
  • —AI agents that need keyless, pay-as-you-go API access
  • —Low-cost per-request API consumption on Base L2

Not for

  • —Users who need detailed API documentation or guaranteed SLAs
  • —High-throughput use cases where $0.02/request adds up significantly
  • —Anyone needing non-USDC or non-Base payment options

Quick start

curl -X POST https://lowpaymentfee.com/api/v1/payments/229 \
  -H "Content-Type: application/json" \
  -H "X-PAYMENT: <x402-payment-proof>"

Endpoint

URLhttps://lowpaymentfee.com/api/v1/payments/229
Transporthttp
Protocolx402
Pay to0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3
CurrencyUSD COIN

Quality

0.35/ 1.00

The endpoint is confirmed live with a valid x402 402 challenge, but documentation pages are empty (only 'Connect wallet' prompts). No request/response schema, no examples, and the endpoint path '/api/v1/payments/229' doesn't match any documented API category. Effectively a stub listing.

Warnings

  • —Documentation pages (/docs, /pricing, /README) contain no substantive content — only a 'Connect wallet' prompt.
  • —The endpoint path /api/v1/payments/229 does not correspond to any of the API categories listed on the landing page; its actual functionality is unknown.
  • —No request or response schema is available; callers cannot determine what data to send or expect back.
  • —The platform lists many API categories (AI, analytics, finance, etc.) but provides no documentation for any of them.

Citations

Provenance

Indexed fromx402_bazaar
Enriched2026-04-19 06:51:49Z · anthropic/claude-opus-4.6 · v2
First seen2026-04-18
Last seen2026-04-24

Agent access

JSONhttps://clawmart.sh/api/listings/d8NRMk
Pay-per-call API platform on Base (USDC) via x402 — $0.02/request, no API keys required. — Clawmart · Clawmart