Pay-per-call token data endpoint for YFI via x402 on Base, settled in USDC.
What it does
This endpoint at lowpaymentfee.com provides token data for YFI (yearn.finance) as part of a broader suite of finance, crypto, AI, and utility APIs. It uses the x402 payment protocol on the Base network, accepting USDC payments at $0.02 per request. No API keys or rate limits are required — callers simply attach an X-PAYMENT header with a valid x402 payment proof to receive a JSON response.
The provider's site lists a wide range of endpoints across categories including data analytics, AI/ML inference, finance/Web3, and infrastructure utilities, all uniformly priced at $0.02 per call. The specific endpoint `/api/v1/tokens/YFI` falls under the crypto/finance category, though it is not explicitly listed on the landing page among the featured endpoints. The exact response schema is not documented; the x402 challenge confirms the endpoint is live, accepts POST requests, and returns application/json.
Documentation is extremely thin — the docs, pricing, and API pages all render only a "Connect wallet" prompt with no further technical detail. There is no OpenAPI spec, no example request/response, and no description of what fields the YFI token endpoint returns. Callers should expect typical token data (price, market cap, volume, etc.) but this is inferred, not confirmed.
Capabilities
Use cases
- —Fetching current YFI token data (price, market info) without managing API keys
- —Integrating real-time token information into trading bots or dashboards
- —Agent-driven crypto data retrieval with automatic per-call USDC micropayments
Fit
Best for
- —Developers or agents needing on-demand YFI token data with no subscription
- —x402-compatible agents that can settle USDC on Base
- —Low-volume or sporadic crypto data lookups where pay-per-call is economical
Not for
- —High-frequency trading requiring sub-second latency guarantees (no SLA documented)
- —Users who need detailed API documentation or guaranteed response schemas before integrating
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/tokens/YFI \
-H "Content-Type: application/json" \
-H "X-PAYMENT: <x402_payment_proof>"Endpoint
Quality
The endpoint is live (402 challenge confirmed) and pricing is clear ($0.02 per call in USDC on Base). However, there is no OpenAPI spec, no documented response schema, no example requests or responses, and the docs/pricing/API pages are empty beyond a wallet-connect prompt. The specific /tokens/YFI path is not even listed on the landing page. This is effectively a stub listing.
Warnings
- —No API documentation available — docs, pricing, and API pages all show only 'Connect wallet'
- —No OpenAPI or response schema provided; response format is unknown
- —The /api/v1/tokens/YFI endpoint is not listed among the provider's featured endpoints on the landing page
- —Exact data returned for YFI token is inferred, not confirmed
Citations
- —The endpoint returns HTTP 402 with x402 version 1 challenge, confirming it is livehttps://lowpaymentfee.com/api/v1/tokens/YFI
- —Payment is in USDC (asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base networkhttps://lowpaymentfee.com/api/v1/tokens/YFI
- —All APIs are priced at $0.02 per request with no API keys, no rate limits, and instant accesshttps://lowpaymentfee.com
- —maxAmountRequired is 20000 base units of USDC (6 decimals) = $0.02https://lowpaymentfee.com/api/v1/tokens/YFI