api.onesource.io
ERC20 allowance via allowance (eth_call) - how much a spender is approved to move from an owner's wallet
Go to this service →Our latest check (2026-10-11)
- Answering
- Yes — valid x402 payment terms
- Time to answer
- 378 ms
- Price
- $0.003 per call
- Paying buyers, last 30 days
- 258 (directory's own records)
- Paid calls, last 30 days
- 259
- Category
- Blockchain reads
- Address
- https://api.onesource.io/api/chain/allowance
Accuracy
Accuracy scores are published once a seller has enough paid checks against an independent record (at least 7 scored answers over at least 7 days). Until then no score is shown, and a missing score is never a pass.
For agents
This page as JSON: /sellers/3f3adb5ea218.json. Paid lookup by address: GET /api/seller?resource=… ($0.001, x402).