x402basequality 0.35

Pay-per-call API suite on Base (USDC) covering data, AI, finance, and utilities at $0.02/request.

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

What it does

lowpaymentfee.com is an x402-enabled API platform that offers a broad collection of endpoints spanning data & analytics, AI & machine learning, finance & Web3, and infrastructure utilities. Every endpoint is priced at $0.02 per request, settled in USDC on the Base network. There are no API keys, no rate limits, and no minimum commitments — callers simply attach an x402 payment header to each request.

The specific endpoint at `/api/v1/messages/138` is listed as "Premium API Access." Its x402 challenge advertises a maximum cost of 20,000 base units of USDC (0x8335…2913 on Base), which equals $0.02 given USDC's 6 decimals. The endpoint accepts HTTP POST and returns `application/json`. Payment is sent to `0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3` with a 300-second timeout.

The broader platform advertises sibling endpoints for sentiment analysis, text summarization, classification, embeddings, price feeds, exchange rates, token quotes, gas estimates, geocoding, validation, conversion, and generation — all at the same $0.02 price point. Documentation beyond the landing page is sparse: the /api, /pricing, and /README pages all resolve to a "Connect wallet" prompt with no further detail, so the exact request/response schemas for this endpoint are unknown.

Capabilities

x402-paymentusdc-basepay-per-requestjson-apihttp-postno-api-keyno-rate-limit

Use cases

  • —Accessing premium API content with per-request USDC micropayments on Base
  • —Agent-driven workflows that need keyless, pay-as-you-go API access
  • —Exploring x402 protocol integrations with low-cost test endpoints

Fit

Best for

  • —Developers experimenting with x402 payment protocol
  • —AI agents that need frictionless, keyless API access
  • —Users who want pay-per-use pricing without subscriptions

Not for

  • —Users who need detailed API documentation or OpenAPI schemas before integrating
  • —High-volume consumers who prefer bulk/subscription pricing

Quick start

curl -X POST https://lowpaymentfee.com/api/v1/messages/138 \
  -H "Content-Type: application/json" \
  -H "X-PAYMENT: <x402-payment-header>" \
  -d '{}'

Endpoint

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

Quality

0.35/ 1.00

The endpoint is live and returns a valid x402 challenge, confirming pricing and payment details. However, there is no OpenAPI schema, no documentation of request/response formats, and the /api, /pricing, and /README pages are all empty wallet-connect stubs. The purpose of this specific endpoint (/api/v1/messages/138) is unclear beyond the generic label "Premium API Access."

Warnings

  • —No documentation available — /api, /pricing, and /README all return only a 'Connect wallet' prompt with no content.
  • —The exact purpose, request schema, and response schema of /api/v1/messages/138 are unknown; 'Premium API Access' is the only description provided.
  • —No OpenAPI spec or ai-plugin manifest found.
  • —Cannot verify what data or functionality this specific endpoint actually provides.

Citations

Provenance

Indexed fromx402_bazaar
Enriched2026-04-21 23:07:44Z · anthropic/claude-opus-4.6 · v2
First seen2026-04-21
Last seen2026-04-22

Agent access

JSONhttps://clawmart.sh/api/listings/MkPEaW
Pay-per-call API suite on Base (USDC) covering data, AI, finance, and utilities at $0.02/request. — Clawmart · Clawmart