Pay-per-call dev utilities (hash, base64, uuid, URL, time, NIP-19, BOLT11) via x402 USDC on Base.
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Base64 encode/decode. args: s, mode (enc|dec), url (1 for urlsafe). Paid: 0.001 USDC on Base via x402 at https://pennyagent.pythonanywhere.com/paid/base64.
This tool takes no arguments.
This tool isn't marked read-only, so it may change something on the server or in an account you connected.
Pick your client. Values in capitals, like YOUR_TOKEN, are yours to fill in.
Run in a terminal
claude mcp add --transport http penny-x402-utils https://pennyagent.pythonanywhere.com/mcp
Base64 encode/decode. args: s, mode (enc|dec), url (1 for urlsafe). Paid: 0.001 USDC on Base via x402 at https://pennyagent.pythonanywhere.com/paid/base64.
No arguments.
{
"type": "object",
"additionalProperties": {
"type": "string"
}
}Decode a Lightning BOLT11 invoice. args: i. Paid: 0.001 USDC on Base via x402 at https://pennyagent.pythonanywhere.com/paid/bolt11.
No arguments.
{
"type": "object",
"additionalProperties": {
"type": "string"
}
}Hex digest of a string. args: s, alg (sha256|sha512|sha1|md5|sha3_256|sha3_512|blake2b|blake2s). Paid: 0.001 USDC on Base via x402 at https://pennyagent.pythonanywhere.com/paid/hash.
No arguments.
{
"type": "object",
"additionalProperties": {
"type": "string"
}
}Decode Nostr NIP-19 (npub/note/nprofile/nevent/naddr). args: s. Paid: 0.001 USDC on Base via x402 at https://pennyagent.pythonanywhere.com/paid/nip19.
No arguments.
{
"type": "object",
"additionalProperties": {
"type": "string"
}
}URL slug of a string. args: s. Paid: 0.001 USDC on Base via x402 at https://pennyagent.pythonanywhere.com/paid/slug.
No arguments.
{
"type": "object",
"additionalProperties": {
"type": "string"
}
}Epoch <-> ISO 8601 UTC. args: t. Paid: 0.001 USDC on Base via x402 at https://pennyagent.pythonanywhere.com/paid/timeconv.
No arguments.
{
"type": "object",
"additionalProperties": {
"type": "string"
}
}URL components and query params. args: u. Paid: 0.001 USDC on Base via x402 at https://pennyagent.pythonanywhere.com/paid/urlparse.
No arguments.
{
"type": "object",
"additionalProperties": {
"type": "string"
}
}List of UUID v4. args: n (1..100). Paid: 0.001 USDC on Base via x402 at https://pennyagent.pythonanywhere.com/paid/uuid.
No arguments.
{
"type": "object",
"additionalProperties": {
"type": "string"
}
}We read every tool's name, description and inputs the way the model will, looking for instructions hidden from you. A clean result means no warning signs, not a guarantee. Scanned Nov 6, 2026.
No readOnlyHint / destructiveHint annotations, so clients can't tell a read from a write without asking.
Fix: Add annotations to each tool, e.g. { readOnlyHint: true } for tools that only read.