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/259

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 lowpaymentfee.com platform, which hosts a catalog of pay-per-request APIs spanning data & analytics, AI & machine learning, finance & Web3, and infrastructure utilities. All endpoints are priced at $0.02 per request, settled in USDC on the Base network, with no API keys, no rate limits, and no commitments required.

The specific endpoint `/api/v1/payments/259` is labeled "Premium API Access" but its exact functionality is not documented beyond that title. The x402 challenge confirms it is live, accepts POST requests, and requires payment of up to 20,000 base units of USDC (0.02 USD) on Base (asset contract 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913). The payment is settled to address 0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3 with a 300-second timeout.

The platform's documentation pages (docs, pricing, README) all render only a "Connect wallet" prompt with no substantive content, so detailed request/response schemas, parameter descriptions, and example payloads are unavailable. The sibling endpoints on the same domain cover sentiment analysis, text summarization, classification, embeddings, price feeds, exchange rates, geocoding, validation, conversion, and generation — all at the same $0.02 price point. Without further documentation it is unclear whether this particular endpoint maps to one of those capabilities or is a distinct service.

Capabilities

x402-paymentusdc-basepay-per-requestno-api-keypost-endpoint

Use cases

  • —Programmatic access to a premium API endpoint with per-call USDC micropayments
  • —Agent-driven workflows that need keyless, on-demand API access settled on Base
  • —Testing x402 payment protocol integrations against a live endpoint

Fit

Best for

  • —Developers experimenting with x402 payment flows
  • —Agents that need keyless pay-per-use API access on Base
  • —Low-volume consumers who want no subscription commitments

Not for

  • —Users who need detailed API documentation or guaranteed SLAs
  • —High-volume production workloads where per-call crypto settlement adds overhead
  • —Anyone without a Base-compatible USDC wallet

Quick start

curl -X POST https://lowpaymentfee.com/api/v1/payments/259 \
  -H "Content-Type: application/json" \
  -H "X-PAYMENT: <x402-payment-token>"

Endpoint

URLhttps://lowpaymentfee.com/api/v1/payments/259
Transporthttp
Protocolx402
Pay to0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3
CurrencyUSD COIN

Quality

0.30/ 1.00

The x402 challenge is live and confirms pricing and network, but the endpoint's actual functionality is undocumented. All docs/pricing/README pages return only a wallet-connect prompt with no content. No request or response schema is available, making it impossible to determine what this endpoint actually does beyond its generic 'Premium API Access' label.

Warnings

  • —Endpoint functionality is completely undocumented — 'Premium API Access' is the only description available.
  • —All documentation pages (docs, pricing, README) render only a 'Connect wallet' prompt with no substantive content.
  • —No request or response schema is provided; callers cannot know what parameters to send or what to expect back.
  • —The specific purpose of /api/v1/payments/259 versus the platform's other listed endpoints is unclear.

Citations

Provenance

Indexed fromx402_bazaar
Enriched2026-04-19 06:52:54Z · anthropic/claude-opus-4.6 · v2
First seen2026-04-18
Last seen2026-04-22

Agent access

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