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Hex Converter
x402
Hex Converter is a paid API for AI agents from flat-rate-llm.kikoribera03.workers.dev, paid per call via x402, $0.0025/call, status unknown (last checked 2026-09-15).
Converts a value between hexadecimal, decimal, and UTF-8 text representations, handling arbitrarily large integers exactly.
Price / call$0.0025
Success—
StatusUnknown
How this service works
60 paid endpoints with no metering, no API key and no account. Each endpoint has one flat price per call, whatever the size of the request: LLM completions with automatic failover across several large models, read-only EVM tooling over Base, Ethereum, Polygon, Arbitrum and Optimism, and pure crypto utilities that touch no network.
Output
Returns a JSON object with three fields: 'hex' (the 0x-prefixed hexadecimal representation), 'decimal' (the exact integer as a string, safe for big integers), and 'bytes' (the byte length of the value). All three formats are always returned regardless of which format was input.
Example use cases
Decode raw EVM RPC hex output
“I got this value back from an Ethereum RPC call: 0x000000000000000000000000000000000000000000000000000000003b9aca00 — can you convert it to a decimal number exactly? JavaScript is overflowing on it.”
Encode text message as hex
“Convert the text 'hello world' into its hex representation for me.”
Decode hex to human-readable text
“What does 0x48656c6c6f2c20576f726c6421 say in plain UTF-8 text?”
Technical details
Endpoint
POSThttps://flat-rate-llm.kikoribera03.workers.dev/v1/util/hexWhen to prefer
Use this endpoint when you need to convert between hex, decimal, and UTF-8 text in a single call, especially when dealing with raw blockchain/RPC output where JavaScript number precision is insufficient. Prefer this over client-side conversion when exact big-integer arithmetic is needed or when you want all three representations simultaneously without writing parsing logic.
Side effects
- Missing 'value' parameter returns an error — value is required
- Invalid or malformed hex string (e.g. missing 0x prefix when format is hex) may cause a parse error
- Providing an unrecognizable format when 'as' is set explicitly may return an error
- Non-numeric text input when 'as' is decimal may fail parsing
- Network or worker availability issues returning 5xx
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| as | string | hex | decimal | text. What the value IS. Defaults to autodetect. |
| valuerequired | string | A 0x-prefixed hex string, a decimal number, or text. |
Output
Schema · Response
| Field | Type | Description |
|---|---|---|
| hex | string | |
| bytes | number | |
| decimal | string |
Tags
x402
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