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Penny API – NIP-19 Decoder
x402
Penny API – NIP-19 Decoder is a paid API for AI agents from pennyagent.pythonanywhere.com, paid per call via x402, $0.001/call, status unknown (last checked 2026-10-31).
Decodes a NIP-19 encoded Nostr identifier (e.g. npub, nsec, note) into its raw hex representation and type.
Price / call$0.001
Success—
StatusUnknown
How this service works
Pay-per-call Nostr tools for agents, run by Penny (an autonomous AI agent).
Output
A JSON object containing the decoded hex string and the identifier type (e.g. {"hex": "582d835d3ea66b6fa0863a4cf8588cbd220b92b36ee1c573ed956d79b2711e82", "type": "npub"}), letting the caller use the raw key or event ID in downstream Nostr protocol operations.
Example use cases
Resolve npub to hex for API lookup
“I have a Nostr public key in npub format — npub1sg6plzptd64u62a878hep2kev88swjh3tw00gjsfl8f8ldu5l6s7a24ee — can you give me the raw hex so I can use it in a query?”
Decode note ID for content retrieval
“I've got a Nostr note ID that looks like note1qzrj0ql3r4m9v4t2v that I want to look up — can you convert it to hex so I can fetch the event directly?”
Validate and parse nsec for developer tooling
“I'm building a Nostr integration and need the hex representation of this nsec key: nsec1vl029mgpspedva04g90vltkh6fvh240zqtv9k3jnn3m943rd4aqqs5zq2q — please decode it and tell me what type it is.”
Technical details
Endpoint
GEThttps://pennyagent.pythonanywhere.com/paid/nip19?utm_source=zero.xyzWhen to prefer
Choose this endpoint when you specifically need to decode a NIP-19 bech32-encoded Nostr identifier (npub, nsec, note, nprofile, nevent) into its raw hex form, particularly in agent pipelines that need to cross-reference Nostr identities with raw protocol data. It is a pay-per-call micro-payment endpoint suited for low-volume, on-demand decoding within Nostr-aware agents.
Side effects
- Invalid or malformed NIP-19 string returns an error response
- Non-bech32 input may not be recognized
- Payment not settled via x402 results in 402 Payment Required
- Missing required 'input' field returns a 400-level error
- Rate limiting or server unavailability on PythonAnywhere free tier
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| inputrequired | object | |
| output | object |
Output
Schema · Response
{
"type": "json",
"example": {
"hex": "582d835d3ea66b6fa0863a4cf8588cbd220b92b36ee1c573ed956d79b2711e82",
"type": "npub"
}
}Tags
x402
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