x402basequality 0.35

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/messages/136

What it does

lowpaymentfee.com hosts a collection of pay-per-request API endpoints gated by the x402 protocol, settling payments in USDC on the Base network. The specific endpoint at `/api/v1/messages/136` is labeled "Premium API Access" and charges a maximum of 20,000 base units of USDC (i.e., $0.02 per request, since USDC uses 6 decimals). No API keys, subscriptions, or rate limits are advertised — callers simply attach an X-PAYMENT header with a valid x402 payment proof.

The broader lowpaymentfee.com platform advertises 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 listed endpoints share the same $0.02/request pricing.

This particular endpoint (`/api/v1/messages/136`) does not clearly map to any of the named categories on the landing page, so its exact functionality is uncertain. The x402 challenge confirms it is live and accepts POST requests returning `application/json`. The payment is sent to address `0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3` using the USDC contract on Base (`0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913`).

Capabilities

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

Use cases

  • —Accessing premium API content with per-request USDC micropayments on Base
  • —Agent-driven workflows that need keyless, on-demand API access
  • —Testing x402 payment flows against a live, low-cost endpoint

Fit

Best for

  • —Developers experimenting with x402 payment protocol
  • —AI agents that need frictionless pay-per-call API access without API keys
  • —Low-volume consumers who want no subscription commitments

Not for

  • —High-throughput production workloads requiring SLAs and guaranteed uptime
  • —Users who need detailed documentation or OpenAPI schemas before integrating
  • —Anyone without a Base-network USDC wallet

Quick start

curl -X POST https://lowpaymentfee.com/api/v1/messages/136 \
  -H "Content-Type: application/json" \
  -H "X-PAYMENT: <x402-payment-proof>"

Endpoint

URLhttps://lowpaymentfee.com/api/v1/messages/136
Transporthttp
Protocolx402
Pay to0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3
CurrencyUSD COIN

Quality

0.35/ 1.00

The x402 challenge is live and pricing is clear ($0.02 USDC on Base), but there is no OpenAPI schema, no documentation of request/response formats, and the specific endpoint's purpose ('messages/136') is unexplained. Crawled pages beyond the landing page returned only 'Connect wallet' with no useful content.

Warnings

  • —The exact functionality of /api/v1/messages/136 is unknown — it does not appear in the site's listed API catalog
  • —No request body schema or response schema is documented anywhere
  • —No OpenAPI spec, README, or detailed docs were found
  • —All non-root crawled pages returned minimal content ('Connect wallet')

Citations

Provenance

Indexed fromx402_bazaar
Enriched2026-04-21 23:02:17Z · anthropic/claude-opus-4.6 · v2
First seen2026-04-21
Last seen2026-04-22

Agent access

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