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Nostr Key/Identifier Converter
x402
Nostr Key/Identifier Converter is a paid API for AI agents from nostr.halowerk.com, paid per call via x402, $0.001/call, status unknown (last checked 2026-09-15).
Converts any NIP-19 bech32 identifier or 64-character hex value into all of its equivalent representations, including TLV-decoded relay hints, author, and kind fields.
Price / call$0.001
Success—
StatusUnknown
How this service works
Takes any public NIP-19 identifier or a 64-character hex value and returns every representation it can be expressed as. A decoded nprofile or nevent yields not only the key or event id but also the relay hints, the author and the kind that the TLV form carries — precisely the fields that make a follow-up query targeted, and precisely what is lost by code that only handles npub.
Output
A JSON object containing all possible representations of the input identifier: hex and bech32 forms (npub/nsec/note/nprofile/nevent as applicable), plus TLV-decoded fields such as relay hints (array of relay URLs), author public key (hex), and event kind (integer) when the input encodes them.
Example use cases
Resolve nprofile for relay-targeted query
“I have this nprofile — nprofile1qqsrhuxx8l9ex335q7he0f09aej04zpazpl0ne2cgukyawd24mayt8gpp4mhxue69uhhytnc9e3k7mg — can you decode it and tell me the hex pubkey plus every relay hint embedded in it so I can query those specific relays?”
Convert hex pubkey to npub for display
“Take this 64-character hex public key 3bf0c63fcb93463407af97a5e5ee64fa883d107ef9e558472c4eb9aaaefa459d and give me the npub and nprofile forms I can show to users.”
Extract event metadata from nevent
“Decode this nevent — nevent1qqstna2yrezu5wghjvswqqculvvwxsrcvu7uc0f78gan4xqhvz49d9spr9mhxue69uhkummnw3ezuamfdejj7q3ql3mnpb2p9r5cuzxsuaah8ajwnsj06fj6ghpkvmwxj4tpuusqnp6jsc6qxqq — and tell me the event ID in hex, the author pubkey, the kind number, and any relay hints it carries.”
Technical details
Endpoint
POSThttps://nostr.halowerk.com/key-convertWhen to prefer
Use this endpoint whenever you need to translate between Nostr identifier formats — especially when you need the full TLV payload (relay hints, author, kind) from an nprofile or nevent that simpler converters discard. Prefer it over generic bech32 libraries when relay-targeted follow-up queries depend on those embedded hints.
Side effects
- Invalid or malformed bech32 string returns an error indicating the identifier could not be parsed
- Hex string of wrong length (not 64 characters) returns a validation error
- Unsupported NIP-19 prefix returns an error
- Network or server error returns HTTP 5xx
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| kind | integer | Event kind for the generated nevent or naddr. |
| input | string | npub, note, nprofile, nevent, naddr, or 64 hex characters. |
| assume | string | How to read bare hex. Ignored for bech32 input, which is unambiguous. |
| author | string | Author public key as hex or npub, for building an nevent or naddr. |
| relays | array | wss relay hints to embed in the generated nprofile, nevent or naddr. |
| identifier | string | The d tag value for building an naddr. Requires author and kind. |
Tags
x402
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