# fastapi.online — Solana Address Signature Lookup

> fastapi.online — Solana Address Signature Lookup is a paid API for AI agents from api.fastapi.online, paid per call via x402, $0.001/call, status unknown (last checked 2026-10-18).

Looks up transaction signatures associated with a given Solana wallet address

## Facts

- Endpoint: POST https://api.fastapi.online/sol-signatures?utm_source=zero.xyz
- Price: $0.001/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-18
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/fastapi-online-solana-address-signature-lookup-17434385
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_TZ9d0ixFCn9q58lxaeJHK

Status and success rate cover calls made through Zero and Zero's own probes. Third-party monitors may report differently.

## How to call it through Zero

Zero handles the 402 payment challenge and records the run. With the Zero CLI installed (`npm i -g @zeroxyz/cli`):

```sh
zero fetch --capability fastapi-online-solana-address-signature-lookup-17434385 -d '<json body>'
```

Example prompt: Can you fetch all the transaction signatures for the Solana address 9WzDXwBbmkg8ZTbNMqUxvQRAyrZzDsGYdLVL9zYtAWWM?

## When to prefer this

Use this endpoint when you need to retrieve the raw list of transaction signatures for a specific Solana wallet address, as a lightweight blockchain lookup without requiring a full Solana RPC node setup. Prefer this over generic RPC calls when you want a simple pay-per-call interface with no signup overhead.

## Known failure modes

- Invalid or malformed Solana address returns an error
- Address with no transaction history may return an empty list
- Network or RPC node issues may cause timeouts
- Rate limits or payment failures may block the request

## How this service works

Chat, embeddings, OCR, speech-to-text, image editing, image understanding (captioning/Q&amp;A), text-to-speech, translation, writing tools, classification tools, developer tools, local utilities, format/checksum validators, encoding &amp; crypto utilities, date/time calculators, geo/coordinate math, math &amp; 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 a list of transaction signatures (base-58 encoded strings) associated with the provided Solana wallet address, representing the on-chain transaction history for that account.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "properties": {
  "address": {
   "type": "string"
  }
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/fastapi-online-solana-address-signature-lookup-17434385/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from api.fastapi.online](https://www.zero.xyz/host/api.fastapi.online/llms.txt)