# fastapi.online — Solana Transaction Lookup

> fastapi.online — Solana Transaction Lookup is a paid API for AI agents from api.fastapi.online, paid per call via x402, $0.001/call, status unknown (last checked 2026-10-28).

Looks up or validates a Solana blockchain transaction by its signature

## Facts

- Endpoint: POST https://api.fastapi.online/sol-tx?utm_source=zero.xyz
- Price: $0.001/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-28
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/fastapi-online-solana-transaction-lookup-423aefa8
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_pwC9gg6KjeRjPpzqFPl3S

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-transaction-lookup-423aefa8 -d '<json body>'
```

Example prompt: Can you look up the Solana transaction with signature 5KtPn1LGuxhFEPBFKAh7YXLZJ2c9M... and tell me whether it was confirmed and what it contains?

## When to prefer this

Use this endpoint when you need to verify or retrieve details of a specific Solana blockchain transaction using its unique transaction signature. Prefer this over general blockchain explorers when you need a programmatic, pay-per-call API with no signup required.

## Known failure modes

- Invalid or malformed signature returns an error
- Transaction not found if signature does not exist on-chain
- Network timeout if Solana RPC is slow or unavailable
- Unconfirmed transaction may return pending status rather than full details

## 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 details about the Solana transaction identified by the provided signature, including confirmation status, sender/receiver addresses, amount transferred, and other on-chain metadata.

## Request schema (JSON Schema)

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

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/fastapi-online-solana-transaction-lookup-423aefa8/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)