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fastapi.online — Token Metadata Lookup
x402
fastapi.online — Token Metadata Lookup is a paid API for AI agents from api.fastapi.online, paid per call via x402, $0.001/call, status down (last checked 2026-09-16).
Retrieves on-chain metadata for a given token contract address on a specified EVM-compatible blockchain network.
Price / call$0.001
Success—
StatusDown
How this service works
Chat, embeddings, OCR, speech-to-text, image editing, image understanding (captioning/Q&A), text-to-speech, translation, writing tools, classification tools, developer tools, local utilities, format/checksum validators, encoding & crypto utilities, date/time calculators, geo/coordinate math, math & finance calculators, novelty tools, and business/social writing generators — 179 endpoints in all, across multiple specialized self-hosted models. Pay per call with crypto — no signup — or get an API key.
Output
Returns on-chain metadata for the specified token contract address, including the token name, symbol, number of decimals, and other contract-level details sourced directly from the specified EVM-compatible blockchain (Ethereum, Base, Polygon, Arbitrum, or Optimism).
Example use cases
Identify unknown token contract
“I found this contract address 0x2791Bca1f2de4661ED88A30C99A7a9449Aa84174 on Polygon — can you tell me what token it is, its symbol, and how many decimals it uses?”
DeFi portfolio enrichment
“I have a list of token addresses on Base and Arbitrum and I need the name and symbol for each one to label my portfolio — start with 0x4200000000000000000000000000000000000006 on Base.”
Validate token before swap
“Before I proceed with this swap, can you fetch the on-chain metadata for contract 0xFd086bC7CD5C481DCC9C85ebE478A1C0b69FCbb9 on Arbitrum so I can confirm it's actually USDT?”
Technical details
Endpoint
POSThttps://api.fastapi.online/token-metadataWhen to prefer
Use this endpoint when you need lightweight, pay-per-call on-chain token metadata resolution across major EVM chains without signing up for a full RPC provider subscription. Ideal for agents that infrequently need token details, want anonymous crypto payment, and need coverage across Ethereum, Base, Polygon, Arbitrum, and Optimism in a single unified API.
Side effects
- Invalid or non-existent contract address returns an error or empty metadata
- Unsupported chain value outside the allowed enum causes a validation error
- Address is valid but is not a token contract (e.g. an EOA or non-ERC-20 contract), resulting in missing or null fields
- Network connectivity issues with the target chain's RPC may cause timeouts
- Payment failure or insufficient USDC balance blocks the call
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| chain | string | |
| address | string |
Tags
x402
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